Ampeg Bass Amplifier BA112 User Manual

							BA-112
BASS AMPLIFIER
Owner’s Manual 
						

							TOP PANEL:
BA-112 BASS AMPLIFIER
0dB -15dB
VOLUME INPUT STYLE TREBLE ULTRA MID BASSHEADPHONES LINE OUTPOWERCD INPUTON12 345
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1. 0dB INPUT:Connect your “passive” bass
guitar here using a shielded instrument
cable. This input is not padded and is best
suited for basses without active electronics
or “hot” pickups.
2. -15dB INPUT: Connect your “active” bass
here using a shielded instrument cable. This
input is padded 15dB and is best suited for
basses with active electronics and/or “hot”
pickups.
3. VOLUME: Use this control in conjunction
with your instrument’s volume controls to
adjust the output level of the amplifier. The
BA-112 employs a built in limiter to keep the
output clean at full power.
4. STYLE:This five-position switch allows
you to vary the tone of the amplifier.
Experiment with the Style and other eq con-
trols (#5,6,7) for the results which suit you
best.
5. TREBLE:Use this control along with the
style control to adjust the high frequency
level of the amplifier. The treble control has
a 36dB range at 10kHz.
6. ULTRA MID:Use this control along with
the style control to adjust the midrange level
of the amplifier. This control has a 30dB
range @ 500Hz.7. BASS:Use this control along with the
style control to adjust the low frequency
level of the amplifier. This control has a
36dB range @ 50Hz.
8. CD INPUT:Use these RCA jacks to con-
nect the line level (or headphones) output of
a CD player or tape deck. The two jacks
sum the stereo signal into a mono signal
which is fed into the BA-112 just prior to its
power amplifier. Use the volume control on
the CD or tape player to control the level of
this signal.
9. LINE OUT:This jack supplies a post-eq,
unbalanced line level signal for connecting
to a house sound board, recording unit or
external amplifier. The level of this signal is
controlled by the Volume control (#3).
10. HEADPHONES:For private practice
sessions, plug a pair of headphones here.
The internal speaker is disconnected when
the headphones jack is used.
11. ON LED:This LED lights when the
amplifier is plugged in and turned on.
12. POWER:Use this switch to turn the
amplifier on and off – on is in the up position. 
						

							BA-112 BASS AMPLIFIER
IMPORTANT SAFEGUARDS AND PRECAUTIONS:
All Ampeg products are designed for continuous safe operation, as long as common
sense is used and steps are taken to help avoid certain problems. Abiding by the fol-
lowing rules can help prevent damage to your amplifier, yourself and others. 
•The amplifier is equipped with a three-pronged AC power cord. To reduce
the risk of electrical shock, NEVERremove or otherwise attempt to defeat
the ground pin of the power cord.
•Connect the amplifier ONLYto a properly grounded AC outlet of the prop-
er voltage for your  amp. 
•Avoid sudden temperature extremes, rain and moisture. Also, avoid sudden
and intense impact. (If the unit has been subjected to any of the preceding
abuses, have it looked at by an authorized service center.)
•NEVERset the amplifier on a support that might give out under its weight.
•Always keep the total speaker impedance at or above the rated load.
•Unplug the amplifier before cleaning it. NEVER spray liquid cleaners onto
the amplifier. Wipe it with a slightly dampened, lint-free cloth to remove dirt
and film.
•Don’t use the amplifier if it has sustained damage to the chassis, controls,
or power cord. Refer the unit to an authorized service center for inspection.
•Amplifiers capable of producing high volume levels are also capable of
inflicting permanent hearing loss or damage, if the exposure to such levels
is prolonged. Such damage is progressive and irreversible! 
THIS EQUIPMENT HAS BEEN DESIGNED AND ENGINEERED TO PROVIDE SAFE AND RELIABLE OPERATION. IN ORDER TO PROLONG THE LIFE OF THE
UNIT AND PREVENT ACCIDENTAL DAMAGES OR INJURY, PLEASE FOLLOW THESE PRECAUTIONARY GUIDELINES:
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT OPEN CHASSIS; DO NOT DEFEAT OR REMOVE THE GROUND PIN OF THE POWER
CORD; CONNECT ONLY TO A PROPERLY GROUNDED AC POWER OUTLET.
WARNING:TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE.
CAUTION: NO USER-SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
CAUTION: OUR AMPLIFIERS ARE CAPABLE OF PRODUCING HIGH SOUND PRESSURE LEVELS. CONTINUED EXPOSURE TO HIGH SOUND PRESSURE
LEVELS CAN CAUSE PERMANENT HEARING IMPAIRMENT OR LOSS. USER CAUTION IS ADVISED AND EAR PROTECTION IS RECOMMENDED IF UNIT IS
OPERATED AT HIGH  VOLUME.
CAUTIONRISK OF ELECTRIC SHOCK
DO NOT OPEN
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK,
DO NOT REMOVE COVER.
NO USER-SERVICEABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
IT IS NECESSARY FOR THE USER TO REFER TO THE INSTRUCTION MANUAL
“ES NECESARIO QUE EL USUARIO SE REFIERA AL MANUAL DE INSTRUCCIONES.”
REFERREZ-VOUS AU MANUAL DUTILISATION
UNBEDINGT IN DER BEDIENUNGSANLEITUNG NACHSCHLAGENEXPLANATION OF GRAPHICAL SYMBOLS:
EXPLICACION DE SIMBOLOS GRAFICOS:
EXPLICATION DES SYMBÔLES GRAPHIQUES:DANGEROUS VOLTAGE
“VOLTAJE PELIGROSO”
DANGER HAUTE TENSION
GEFAHLICHE SPANNUNG==
ATTENTIONRISQUE DELECTROCUTION
NE PAS OUVRIR
ATTENTION: POUR REDUIRE DELECTROCUTION NE PAS
ENLEVER LE COUVERCLE. AUCUNE PIECE INTERNE NEST REPRABLE
PAR LUTILISATEUR. POUR TOUTE REPARATION, SADRESSER A UN
TECHNICIEN QUALIFIE.
VORSICHTELEKTRISCHE SCHLAGGEFAHR
NICHT OFFENEN
VORSICHT: ZUR MINIMIERUNG ELEKTRISCHER SCHLAGGEFAHR NICHT
DEN DECKEL ABENHMEN. INTERNE TEILE KONNEN NICHT VOM
BENUTZER GEWARTET WERDEN. DIE WARTUNG IS QUALIFIZIERTEM
WARTUNGSPERSONAL ZU UBERLASSEN. 
						

							www.ampeg.com
Ampeg is proudly Made in America.
©1999 SLM Electronics, 1400 Ferguson Avenue, St. Louis, MO 63133 U.S.A.
TECHNICAL SPECIFICATIONS:
OUTPUT POWER RATING50 Watts at 8 ohms
MAX INPUT LEVELS0dB Input: 800mV RMS
-15dB Input: 4.62V RMS
CD Input: 3.5V RMS
LINE OUT LEVEL1.75V RMS
HEADPHONE OUT LEVEL2.75V RMS
GAIN40dB  
STYLE1 = -25dB @500Hz
2 = -12dB @500Hz
3 = flat
4 = +5dB @2kHz and above
5 = -6dB @50Hz and below
TREBLE36dB range @10kHz
ULTRA MID30dB range @500Hz
BASS36dB range @50Hz
SPEAKER SPECS12”, 50 w, 8 ohm, 1.5” voice coil dia., 30 oz. magnet
POWER REQUIREMENTS120VAC, 60Hz,  70VA
100/115VAC, 50/60Hz, 70VA
230VAC, 50/60Hz, 70VA
SIZE AND WEIGHT17-1/4” W x 18” H x 13-1/4” D; 39 lbs.
Ampeg continually develops new products, as well as improves existing ones. For this reason,
the specifications and information in this manual are subject to change without notice.
47-054-01 • 03/99
0dB
INPUT
-15dB
INPUT
VOLUMEMIXERSPEAKER
STYLE
BASSULTRA MIDTREBLE
CD
INPUTS
TONE CIRCUITS
LIMITER
& POWER AMP
LINE
OUT
HEAD
PHONE
L
R
SYSTEM BLOCK DIAGRAM:
BA-112 BASS AMPLIFIER