Yamaha Bbt 500 H Manual

							Owner’s Manual
Mode d’emploi
Bedienungsanleitung
BASS AMPLIFIER
BBT500H
Manual del Usuario
Handleiding
Manuale di Istruzioni 
						

							2
•This applies only to products distributed by Yamaha-Kemble Music (U.K.) Ltd.
IMPORTANT NOTICE FOR THE UNITED KINGDOM
Connecting the Plug and Cord
WARNING: THIS APPARATUS MUST BE EARTHED
IMPORTANT.  The wires in this mains lead are coloured in
accordance with the following code:
GREEN-AND-YELLOW : EARTH
BLUE : NEUTRAL
BROWN : LIVE
As the colours of the wires in the mains lead of this apparatus may not
correspond with the coloured markings identifying the terminals in your
plug  proceed as follows:
The wire which is coloured GREEN-and-YELLOW must be connected
to the terminal in the plug which is marked by the letter E or by the
safety  earth symbol  or colored GREEN or GREEN-and-YELLOW.
The wire which is coloured BLUE must be connected to the terminal
which is marked with the letter  N or coloured BLACK.
The wire which is coloured BROWN must be connected  to the terminal
which is marked with the letter L or coloured RED.
FCC INFORMATION (U.S.A.)
1. IMPORTANT NOTICE: DO NOT MODIFY THIS UNIT!This product, when installed as indicated in the instructions
contained in this manual, meets FCC requirements. Modifica-
tions not expressly approved by Yamaha may void your au-
thority, granted by the FCC, to use the product.
2. IMPORTANT: When connecting this product to accessories
and/or another product use only high quality shielded cables.
Cable/s supplied with this product MUST be used. Follow all
installation instructions. Failure to follow instructions could
void your FCC authorization to use this product in the USA.
3. NOTE: This product has been tested and found to comply
with the requirements listed in FCC Regulations, Part 15 for
Class “B” digital devices. Compliance with these require-
ments provides a reasonable level of assurance that your use
of this product in a residential environment will not result in
harmful interference with other electronic devices. This
equipment generates/uses radio frequencies and, if not in-
stalled and used according to the instructions found in the
users manual, may cause interference harmful to the opera-
tion of other electronic devices. Compliance with FCC regula-tions does not guarantee that interference will not occur in all
installations. If this product is found to be the source of inter-
ference, which can be determined by turning the unit “OFF”
and “ON”, please try to eliminate the problem by using one of
the following measures:
Relocate either this product or the device that is being af-
fected by the interference.
Utilize power outlets that are on different branch (circuit
breaker or fuse) circuits or install AC line filter/s.
In the case of radio or TV interference, relocate/reorient the
antenna. If the antenna lead-in is 300 ohm ribbon lead,
change the lead-in to co-axial type cable.
If these corrective measures do not produce satisfactory
results, please contact the local retailer authorized to distrib-
ute this type of product. If you can not locate the appropriate
retailer, please contact Yamaha Corporation of America,
Electronic Service Division, 6600 Orangethorpe Ave, Buena
Park, CA90620
The above statements apply ONLY to those products distrib-
uted by Yamaha Corporation of America or its subsidiaries.
* This applies only to products distributed by YAMAHA CORPORATION OF AMERICA.
• This applies only to products distributed by Yamaha Canada Music Ltd.
• Ceci ne s’applique qu’aux produits distribués par Yamaha Canada Musique Ltée.
CANADA
This Class B digital apparatus complies with Canadian ICES-003.
Cet appareil numérique de la classe B est conforme à la norme NMB-
003 du Canada. 
						

							3
1 Read these instructions.
2 Keep these instructions.
3 Heed all warnings.
4 Follow all instructions.
5 Do not use this apparatus near water.
6 Clean only with dry cloth.
7 Do not block any ventilation openings. In-
stall in accordance with the manufacturers
instructions.
8 Do not install near any heat sources such as
radiators, heat registers, stoves, or other
apparatus (including amplifiers) that pro-
duce heat.
9 Do not defeat the safety purpose of the po-
larized or grounding-type plug. A polarized
plug has two blades with one wider than the
other. A grounding type plug has two blades
and a third grounding prong. The wide blade
or the third prong are provided for your
safety. If the provided plug does not fit into
your outlet, consult an electrician for re-
placement of the obsolete outlet.
IMPORTANT SAFETY INSTRUCTIONS
10 Protect the power cord from being walked on
or pinched particularly at plugs, convenience
receptacles, and the point where they exit
from the apparatus.
11 Only use attachments/accessories specified
by the manufacturer.
12 Use only with the cart,
stand, tripod, bracket, or
table specified by the
manufacturer, or sold with
the apparatus. When a cart
is used, use caution when
moving the cart/apparatus
combination to avoid injury
from tip-over.
13 Unplug this apparatus during lightning
storms or when unused for long periods of
time.
14 Refer all servicing to qualified service per-
sonnel. Servicing is required when the appa-
ratus has been damaged in any way, such as
power-supply cord or plug is damaged, liquid
has been spilled or objects have fallen into
the apparatus, the apparatus has been ex-
posed to rain or moisture, does not operate
normally, or has been dropped.
WARNING
TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS APPARATUS TO RAIN OR
MOISTURE. 
						

							4
SPECIAL MESSAGE SECTION
PRODUCT SAFETY MARKINGS: Yamaha electronic prod-
ucts may have either labels similar to the graphics shown be-
low or  molded/stamped facsimiles of these graphics on the
enclosure. The explanation of these graphics appears on this
page. Please observe all cautions indicated on this page and
those indicated in the safety instruction section.ENVIRONMENTAL ISSUES: Yamaha strives to produce
products that are both user safe and environmentally friendly.
We sincerely believe that our products and the production meth-
ods used to produce them, meet these goals. In keeping with
both the letter and the spirit of the law, we want you to be aware
of the following:
Warning: Do not attempt to recharge, disassemble, or inciner-
ate this type of battery. Keep all batteries away from children.
Dispose of used batteries promptly and as regulated by appli-
cable laws. Note: In some areas, the servicer is required by law
to return the defective parts. However, you do have the option
of having the servicer dispose of these parts for you.
Disposal Notice: Should this product become damaged beyond
repair, or for some reason its useful life is considered to be at an
end, please observe all local, state, and federal regulations that
relate to the disposal of products that contain lead, batteries,
plastics, etc.
NOTICE: Service charges incurred due to lack of knowledge
relating to how a function or effect works (when the unit is
operating as designed) are not covered by the manufacturer’s
warranty, and are therefore the owners responsibility. Please
study this manual carefully and consult your dealer before re-
questing service.
NAME PLATE LOCATION: The graphic below indicates the
location of the name plate and serial number label. Information
such as model number, power requirements, serial number, etc.,
can be found at these two locations. You should record the model
number, serial number, and the date of purchase in the spaces
provided below and retain this manual as a permanent record
of your purchase.
See rear of Amplifier for graphic symbol markings.
The exclamation point within the equi-
lateral triangle is intended to alert the
user to the presence of important oper-
ating and maintenance (servicing) in-
structions in the literature accompany-
ing the product.
The lightning flash with arrowhead sym-
bol, within the equilateral triangle, is
intended to alert the user to the presence
of uninsulated “dangerous voltage”
within the product’s enclosure that may
be of sufficient magnitude to constitute
a risk of electrical shock.
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK.
DO NOT REMOVE COVER (OR BACK).
NO USER-SERVICEABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
IMPORTANT NOTICE: All Yamaha electronic products are
tested and approved by an independent safety testing labora-
tory in order that you may be sure that when it is properly in-
stalled and used in its normal and customary manner, all fore-
seeable risks have been eliminated. DO NOT modify this unit
or commission others to do so unless specifically authorized by
Yamaha. Product performance and/or safety standards may be
diminished. Claims filed under the expressed warranty may be
denied if the unit is/has been modified. Implied warranties may
also be affected.
SPECIFICATIONS SUBJECT TO CHANGE:  The infor-
mation contained in this manual is believed to be correct at the
time of printing. However, Yamaha reserves the right to change
or modify any of the specifications without notice or obligation
to update existing units.
92-469-
 (rear)
Model
Serial No.
Purchase Date 
						

							5
Avoid using your amplifier and speaker in the following locations
to prevent possible damage:
  •In direct sunlight or next to heating equipment.
  •Extremely cold or hot locations.
  •Locations exposed to high humidity or excessive dust.
  •Locations subject to strong shocks or vibration.
Avoid installing this unit where foreign object may fall onto this
unit and/or this unit may be exposed to liquid dripping or
splashing. On the top of this unit, do not place:
  •Other components, as they may cause damage and/or
discoloration on the surface of this unit.
  •Burning objects (i.e. candles), as they may cause fire,
damage to this unit, and/or personal injury.
  •Containers with liquid in them, as they may fall and liquid may
cause electrical shock to the user and/or damage to this unit.
Before making any connections, make sure that the power on
the amplifier and any external devices is switched OFF.
To protect the speaker from possible damage, always set the
OUTPUT knob to “0” before switching the power ON/OFF.
When connecting the speaker jack to a speaker, use only a
cable designed specifically for connecting a speaker to the
amplifier. The use of any other cable can result in fire.
Even if the device’s main power switch is switched OFF, power
is not cut off from the device. Place the device close to an easily
accessible electric outlet so it can be plugged in or unplugged
with ease.
Your Yamaha amplifier is a precision musical instrument. Handle
it with care and avoid dropping or bumping it.
Do not apply excessive force to the switches and controls.
To prevent damage and possibly electrical shock, never open
the case and tamper with the internal circuitry.
Do not block the ventilation ducts. The device is designed with
ducts on the front and back to prevent temperatures from rising
inside the device. Blocking the ducts will cause heat to buildup
Precautions
inside the device, which may result in fire. NEVER operate the
device in any of the manners described below.
* Never place the device on its back, side, or upside-down.
* Install the device in anything other than the specified rack, such in a
narrow bookshelf, in an small enclosed space, or a place with poor
ventilation, etc.
* Cover the device with a cloth or place the device on a carpet or bed.
When the devices is installed in an audio rack, etc., make sure
that there is sufficient space between the wall or other equip-
ment, and the device. The device requires clearance of at least
5cm on its sides, 10cm at the back, and 10cm above.
Also, open the rear of the rack, or open a hole in the back of the
rack to provide the device with ventilation.
Poor ventilation will cause heat to buildup inside of the device,
which can result in fire.
Never place the device on an unstable surface, table, or sloped
surface. Also, never stack the device excessively. Doing so may
cause the device to fall or overturn, causing injury.
* If the device is to be stacked, we recommend that the casters be removed
from the amplifier/speaker to prevent overturning.
During thunderstorms, switch off the power as soon as possible
and unplug the device from the electric outlet. If there are
lightning strikes, do not touch the power cable if it is still
connected to the electric outlet. Doing so can result in electric
shock.
For safety, always remove the power plug from the AC wall
outlet if there is any danger of lightning striking in your area.
Do not use the amplifier for any other purpose than powering a
speaker system.
Keep the amplifier away from neon signs or fluorescent lighting
to prevent noise pickup.
Never use benzene, thinner or other volatile liquids for cleaning,
as these chemicals may cause damage or discoloration to the
finish. Always use a dry, soft cloth to wipe off dust and dirt.
Operating Cautions!
To use in a safe manner, please obey the following
 About the XLR jack’s polarity
The pin order of the XLR type connector is as follows:
1: Shield (GND),  2: Hot (+),  3: Cold (-)
This conforms to the IEC60268 standard.
 About Cellular Phone Interference
Cellular phones used in close proximity to the device may
cause noise. If this is the case, move the phone a little
away from the device. 
						

							6
Thank you for purchasing the Yamaha BBT500H Bass Amplifier.
The BBT500H is an all-digital bass amplifier that utilizes Yamaha’s DSP technology to
provide bassists with extensive sound tailoring capabilities and simple operation. Thanks to the
use of a highly efficient digital power amplifier in combination with Yamaha’s power switching
technology the BBT500H can deliver an unprecedented 500W/2Ω of power from its compact
and lightweight design.
The BBT500H offers bassists precision sound tailoring and control with its 11 sound
variation types, 5-band semi-parametric equalizer, compressor, limiter, and noise gate. It is also
equipped with a speaker simulator and effects loop for greater tone tailoring and versatility. The
BBT500H provides 5 internal memory locations that let you store up to five tone settings for
instant recall at the press of a switch. It also offers MIDI compatibility and a bi-amp system
(using two amplifiers to create a single system), etc. that make it an excellent choice for use in
the studio or live performances.
In order to get the most out of your BBT500H and its sophisticated functions, please
thoroughly read this Owner’s Manual before using the device. Also, keep the manual in a safe,
convenient place for future reference.
CONTENTS
Panel Controls and Connections ........................................ 7
Front Panel .................................................................................. 7
Rear Panel .................................................................................. 8
Operating Instructions ...................................................... 10
Getting sound output ................................................................. 10
Adjusting the Input Level ........................................................... 10
Sound Setting ........................................................................... 10
Storing and Recalling Patches .................................................. 11
Detailed Parameter Settings ............................................. 12
Amp Mode ................................................................................. 12
Equalizer Mode ......................................................................... 13
Compressor Mode .................................................................... 13
Utility Mode ............................................................................... 14
Attaching the Rack Mount Adaptor .................................. 17
Air Flow ............................................................................... 17
Attaching the Clamp Filter ................................................ 17
Error Messages .................................................................. 18
Troubleshooting ................................................................. 18
Specifications ..................................................................... 19
MIDI Implementation Chart ............................................... 95 
						

							7
Panel Controls and Connections
Front Panel
!0
qwertyuio
!1!2!3
qPower Switch
This is the unit’s main power switch.
* Always set the OUTPUT volume to “0” before switching the power ON or
OFF to protect the speaker from damage.
wInput Jack (INPUT)
This is the unit’s input jack.
Connect the output jack on your bass to this jack.
* Make sure that the power is switched OFF before connecting the bass.
* For U.S. and Canadian models only
To protect against electromagnetic waves, attach
the supplied Clamp Filter to the cable connecting
the bass guitar to the amplifier. (→ pg. 17)
eInput Level Volume (INPUT LEVEL)
Adjusts the amplifier’s input volume level and the volume of the bass
that is connected to the BBT500H. Use the indicators located on either
side of the knob to check the signal level. (→ pg. 10)
* The INPUT LEVEL setting is not saved in memory.
rSound Type Select Switch (SOUND TYPE)
Select one of the eleven preset sound variation types.
The indicator of the selected sound type will light. (→ pg. 10)
tCompressor Volume  (COMP)
Adjusts the compressor’s compression ratio.
In the Equalizer mode, this knob is used to set the center frequency
(PEQ F) of the 1-band parametric equalizer. (→ pg. 13)
yGain Volume  (GAIN)
Adjusts the pre-amplifier’s gain volume level.
* When this knob is set to “0”, no sound will be produced although the
Master Volume is turned up.
In the Equalizer Mode, this knob is used to set the bandwidth (PEQ Q)
of the 1-band parametric equalizer. (→ pg. 13)
In the Compressor Mode, this knob is used to set the compressor thresh-
old (THRSLD). (→ pg. 13)
uMaster Volume  (MASTER)
Adjusts the overall volume of the sound created with the Gain and Tone
Control settings. Adjusts the preamplifier’s output level.
* The MASTER volume setting is saved in memory.
In the Equalizer Mode, this knob is used to set the Gain (PEQ G) vol-
ume level of the 1-band graphic equalizer. (→ pg. 13)
In the Compressor Mode, this knob is used to adjust the compressor’s
attack (ATTACK) time. (→ pg. 13)
iTone Controls
(BASS, LOW MID, MIDDLE, HIGH MID, TREBLE)
Adjusts the level of their corresponding frequencies.
In the Equalizer Mode, these knobs are used to set the center frequency
(FREQ) for their corresponding tone control. (→ pg. 13)
In the Compressor Mode, these knobs are used to adjust the param-
eters given below. (→ pg. 13)
BASS ........... Compressor’s release (RELEASE) time
LOW MID ..... Compressor’s output gain (C. GAIN)
MIDDLE ....... Compressor’s knee (KNEE)
HIGH MID .... Noise gate threshold (N. GATE)
TREBLE ....... Effect loop blend level (BLEND)
oOutput Volume Level (OUTPUT)
Adjusts the power amplifier’s output level.
This knob is used to set the overall volume level (the amount delivered
by the speaker) of the sound created by the pre-amplifier section’s GAIN,
MASTER, Tone Controls, etc. Adjusting this volume level has no effect
on tone.
* The OUTPUT level setting is not saved in memory.
* This setting does not effect the output level (volume) of the LINE OUT !8
jack.
!0Manual Switch (MANUAL)
This switch resets all parameter values (including Equalizer and Com-
pressor mode settings) to the state they were in when the power was
switched ON. All knobs function as labeled on the panel, and the setting
for each control corresponds to the position of the knob.
If you continuously hold the switch, all settings will be returned to the
state that they were in just before the [MANUAL] or Memory switch was
pressed (Undo Function). (→ pg. 12)
!1Memory Switches (1-5)
These switches are used to recall data for patches (1-5) saved in the unit’s
memory. The selected memory’s (switch’s) indicator lights. (→ pg. 11)
After editing patch data, press and hold the switch for about 1 second to
save the data to memory. (→ pg. 11)
!2Display
Displays information such as parameter values, etc.
!3Function Switch (FUNCTION)
This switch is used to select the unit’s operating mode.
•Amp Mode (→ pg. 12)
•Equalizer Mode (→ pg. 13)
•Compressor Mode (→ pg. 13)
•Utility Mode (→ pg. 14) 
						

							8
STATUS
DATA/CTRLBANK MSB/MAX
BANK LSB/MIN
TOGGLE ON-OFF
/NUMBER OF PGMDEC
/NOINC
/YESMEMORY
EDITPC
EDITWRITE
/EXIT±108.8.8.
Before making any connections, make sure that the power on
the BBT500H and all other related devices is switched OFF.
!4
Speaker(s)Save patches to a
MIDI deviceUse a MIDI controller to select
patch memory
MIDI INMIDI OUT Outboard Effects ProcessorMixer or Additional Amplifier
OUTIN
Panel Controls and Connections
!5!6!7!8!9@0@1@2
Headphones
Tuner
AC PowerSupplied power
cable
@4@3
@5
Rear Panel
!4Tuner Output (TUNER OUT)
This output jack is used to connect a tuner to the BBT500H.
It can also be used to create a bi-amp system. Connect this output jack
to the INPUT jack on another BBT500H. (→ pg. 14)
!5Effect Loop (FX LOOP)
• Effect Send Jack (SEND)
• Effect Return Jack (RETURN)
• Effect Loop Level Switch (LEVEL)
These jacks let you insert an outboard effects processor between the
SEND and RETURN jacks to apply effects to the BBT500H’s signal.
Use the Level Switch to match the Input/Output level with the level re-
quired by the outboard effects processor. Use the BLEND control in the
Compressor Mode to adjust the balance level between the outboard
effector’s sound and the sound that is created by the BBT500H. (→ pg.
13)
!6Headphones Jack (PHONES)
This jack is used to connect a pair of headphones to the unit. It carries
the same signal that is delivered from the LINE OUT jack. Use the LEVEL
control to adjust the volume.
!7Headphones/Line Out Level Control (LEVEL)
Adjusts the output level of the PHONES jack and the LINE OUT jacks.
(The same setting is applied to both jacks.)
!8Line Out Jack (UNBALANCED OUT, BALANCED OUT)
These jacks carry the signal that is selected with the !9 Line Out Source
Switch at a line level.
Both unbalanced phone type (+4 dB/10 kΩ) and balanced XLR type
(+4 dB/600 Ω) jacks are provided.
Use the LINE SOURCE switch to select the signal that is sent to the
LINE OUT jack. As the unit is equipped with an output limiter and speaker
simulator (can be switched ON/OFF), and the output level of these jacks
is controlled by the LEVEL control, these jacks can be used to send a
line level signal to a mixing console or an additional amplifier.
!9Line Out Source Switch
(LINE SOURCE: THRU/PRE EQ/POST EQ)
This switch is used to select the signal that is delivered from the LINE
OUT jack.
THRU ........... Delivers the signal received via the INPUT jack without
alteration.
Select this setting when connecting to a DI (Direct In-
jection) box.
PRE  EQ ....... Delivers the signal before it has been processed by the
tone controls (the Sound Type is active).
This setting can be used when separate EQ settings
are required for speaker and line outputs.
POST EQ ..... Delivers the signal after it has been processed by the
tone controls.
Clamp Filter (→ pg. 17)
* For U.S. and Canadian
models only 
						

							9
* Total Impedance
Whenever two or more speaker cabinets are connected to the unit,
consideration must be given to the total impedance of the speaker
system.
Normally, a speaker cabinet has an impedance of 4, 8 or 16Ω. But
when two or more speaker cabinets are used together, the total
impedance will change according to the manner in which the cabi-
nets are connected.
 Connecting in a Series
Total impedance = 1st Speaker + 2nd Speaker + 3rd Speaker …
Connecting three 4Ω speaker cabinets in a series as shown below,
results in a total impedance of 12Ω.
Panel Controls and Connections
This setting can be used when you want the line signal
processed with the same EQ setting as the speaker.
* The FX LOOP is active on both PRE EQ and POST EQ signals.
@0Speaker Simulator Switch (SP SIM: OFF/LINE/ON)
This switch is used to switch the Speaker Simulator circuit ON/OFF.
When the Speaker Simulator is activated, this special circuit adds the
live characteristics of a speaker to the line out signal and headphones
output. This feature is useful when you want to produce a distorted tone
with a speaker system that incorporates a tweeter, or to add the reso-
nance of a large speaker and its enclosure to a speaker system that
uses only small speakers. The sound created with the Speaker Simula-
tor is optimized to compliment the selected Sound Type.
OFF ..............Deactivates the Speaker Simulator on LINE OUT,
SPEAKER, and PHONES jack signals.
LINE .............Activates the Speaker Simulator on LINE OUT, and
PHONES jack signals only.
ON ................Activates the Speaker Simulator on LINE OUT,
SPEAKER, and PHONES jack signals.
* The Speaker Simulator can only be applied to the LINE OUT jack output
when the !9  Line Out Source Switch is set to “POST EQ”.
@1Output Limiter Switch (OUTPUT LIMITER: ON/OFF)
This switch is used to switch the Output Limiter circuit ON/OFF.
When set to the ON position, the limiter suppresses the signal if it ex-
ceeds the threshold before sending it to the SPEAKER jack and LINE
OUT jack.
OFF ..............Deactivates the Limiter on both LINE OUT and SPEAKER
jack signals.
ON ................ Activates the Limiter on both LINE OUT and SPEAKER
jack signals.
@2MIDI OUT Jack
Connect this jack to the MIDI IN jack on an external MIDI device that
can save MIDI data (such as a MIDI data filer, etc.), and save patch data
from the BBT500H to an external device. (→ pg. 16: MIDI Bulk Out)
Also, when MIDI Merge is set ON, MIDI data received from an external
MIDI device via the MIDI IN jack is transmitted from the MIDI OUT jack
without alteration. (→ pg. 16)
@3MIDI IN Jack
Connect this jack to the MIDI OUT jack on MIDI Foot Controller, etc., to
select patches, control volume, etc., with the MIDI Foot Controller. (→
pg. 15)
Also, patches that have been saved to an external MIDI device can be
loaded into the BBT500H’s internal memory. (→ pg. 16: MIDI Bulk IN)
@4Speaker Jacks (SPEAKER 1, 2)
Two Speaker Jacks are provided for connecting speaker systems.
The two jacks are connected in parallel inside the unit. Make sure that
the speaker cabinet you use meets the requirements given below.
When using a single SPEAKER Jack (1 or 2)
Please use a system that complies with one of the following re-
quirements.
•The total impedance* of the circuit should never be less than 2Ω.
•A 2Ω speaker system must have a power handling capability of
500W or greater.
•A 4Ω speaker system must have a power handling capability of
250W or greater.
•An 8Ω speaker system must have a power handling capability of
125W or greater.When using both SPEAKER Jacks (1 & 2)
Please use a system that complies with one of the following re-
quirements.
•The total impedance* of the circuit should never be less than 2Ω.
•A 4Ω speaker system must have a power handling capability of
250W or greater.
•An 8Ω speaker system must have a power handling capability of
125W or greater.
To obtain optimum performance from the amplifier, we recommend that
a speaker system with a power handling capability of 250W or greater
and impedance of 4Ω be used with each SPEAKER jack (1 and 2).
* For U.S. and Canadian models only
To protect against electromagnetic waves, attach the sup-
plied Clamp Filters to the cables connecting the amplifier’s
SPEAKER 1, 2 jacks to the speakers. (→ pg. 17)
@5Power Connector (AC IN)
Connect the supplied power cable to this terminal to supply the unit with
power from an AC power outlet.
When connecting the power cable, make sure the
amplifier’s POWER switch is turned OFF.
 Connected in Parallel
Total impedance =
Connecting three 4Ω speaker cabinets in a parallel configuration
as shown below, results in a total impedance of about 1.3Ω.
444 
						

							10
Sound Setting
When the power is switched ON, all control knobs function as labeled
on the panel and described below. All lamps on the display above the
control knobs and switches are unlit.
Rotate the SOUND TYPE knob to select a sound type, then use the
Tone Control knobs to shape the sound. Before selecting a sound type,
first set the GAIN through TREBLE control knobs to their center posi-
tions then try out the different Sound Types.
Also, the COMP knob is used to adjust the compressor’s compression
ratio. The compressor automatically balances the differences between
loud and soft levels when playing. Rotate the knob to the right to in-
crease the amount of compression.
q
qINPUT LEVEL: Sets the Input Level
wSOUND TYPE: Selects the Sound Type (11 types)
FLAT ............ A clean tone with all frequencies set flat. This setting also
works well with an upright bass or an electric-acoustic bass.
TUBE ........... A clear and warm tube type sound. This setting also works
well with an upright bass or an electric-acoustic bass.
SOLID ......... A fat solid-state type sound
R & B ........... A fat R & B type sound
VINTAGE ..... A vintage tone with warm mid frequencies
MODERN .... A modern sound with rich low-end and bright high-end
CLASSIC ..... Rock bass sound
HEAVY ........ A heavier sound than the CLASSIC setting
DRIVE ......... Overdrive bass sound
DIST ............ Distortion bass sound
FUZZ ........... Fuzz bass sound
eCOMP: Compression Ratio (1.0 to ∞, 16 steps)
This adjusts the compressor’s compression ratio and output levels simul-
taneously.
As the value increases, so does the amount of compression applied to
signals that exceed the threshold level (→ pg. 13).
rGAIN: Pre-Amp Gain (0 to 10, 0.1 step)
tMASTER: Master Volume (0 to 10, 0.1 step)
yBASS: Bass Frequency (-15dB to +15dB, 0.2dB step)
uLOW MID: Low Mid Frequency (-15dB to +15dB, 0.2dB step)
iMIDDLE: Middle Frequency (-15dB to +15dB, 0.2dB step)
oHIGH MID: High mid Frequency (-15dB to +15dB, 0.2dB step)
!0TREBLE: Treble Frequency (-15dB to +15dB, 0.2dB step)
!1OUTPUT: Sets the output level
Getting sound output
1 First, make sure that the POWER switch is switched OFF, then
connect your bass to the INPUT Jack on the front panel.
2 Rotate the OUTPUT knob fully to the left and then switch the
POWER switch ON.
To protect the speakers, make sure that the
OUTPUT knob is set to “0” whenever switch-
ing the POWER switch ON or OFF.
Operating Instructions
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3 First, set the INPUT LEVEL knob to its 12 O’clock position, then
while playing the bass, gradually increase the GAIN, MASTER,
and OUTPUT knobs to adjust the sound.
4 Once the system is producing sound, set the input level as
described in the “Adjusting the Input Level” section below.
Set the knob so that the red
indicator does not light.
Adjusting the Input Level
The INPUT LEVEL control optimizes the signal received from the bass
for use with the amplifier, to produce wide dynamic range and rich tone.
A poorly adjusted level results in noise, feedback, a cutup sound, etc.
* Since output levels vary from instrument to instrument, you will need to
readjust the input level to match the instrument’s output level whenever
you change instruments.
1 Rotate the volume control on your bass to its maximum level
and play loudly while rotating the INPUT LEVEL knob.
An ideal level is attained when the green indicator is lit.
2 Continue to rotate the INPUT LEVEL knob to the right making
sure the red indicator does not light. As long as the red indica-
tor does not light, rotate the knob fully to the right.
HINTUsing the OUTPUT and MASTER Controls
Both knobs can be used to control the overall volume however, the
MASTER knob is the preamplifier’s master volume and its setting is
saved in memory. The OUTPUT knob is the power amplifier’s output
volume and its setting is not saved in memory. Use the MASTER knob
to set individual volume settings of patches saved to memory, and use
the OUTPUT knob to set the output volume level produced by the speak-
ers.