American Audio Amplifier VLP 2500 User Manual

							©American Audio®  -  www.americanaudio.us  -  vLP 2500 Power Amplifier user manual  Page 11
Mono  Subwoofer  - This  operation  is  similar  to  the  Stereo  Subwoofer  operation  but  in  mono.  When  running  subwoofers  it  is  usually 
recommended  to  run  them  in  mono  mode  to  achieve  a  cleaner  tighter  low  end.  This  operation  allows  you  to  run  several  subwoofers 
down to a minimum of 4 ohms. To avoid amplifier  overheating, never run the amplifier  below 8 ohms in this mode. Set up this mode 
as you would a standard stereo set up. Be sure both channels are set to “SuBWooF” and the mode switch is set to “mono.” in this 
mode you may use the frequency adjustment on the rear of the amp, to control the bass frequency output level. Frequencies may be 
adjusted from 20Hz to 200Hz.
one  Channel normal/one  Channel  subwoofer (BI-aMP) - You  may  also  use  your  amp  to  bi-amp  your  system.  You  may  use  one 
side of the amp to power a subwoofer and the other side to power a full range speaker. Follow the set up guides listed above to mix 
and match your operations.
proteCtIon:
Limiter - The vLP 2500 comes with a built in limiter. When the input signal overloads, the “cLiP Led’s” indicate a signal overload, at 
this  time,  the  master  volume  should  be  lowered  to  reduce  distortion.  if  the  input  gain  level  is  not  reduced  the  built-in  limiter  will  acti-
vate. during  signal  overload,  the  limiter  will  reduce  the  input  audio  signal  enough  to  minimize  the  amount  of  clipping.  A  limiter  takes 
the gain of an overloading signal and reduces it, the reduction in gain reduces distortion that can cause damage to your speakers and 
amplifier.  during  normal  operation  below  clipping,  and  momentary  clips  on  peaks,  the  limiter  does  not  affect  the  audio  signal  and  is 
inaudible.  it  will  allow  brief  clipping  of  peaks  and  will  only  activate  when  continuous,  hard  clipping  occurs.  during  excessive  clipping 
the limiter will reduce the audio signal enough to minimize the amount of clipping. When the input signal decreases enough that clip-
ping ends, the limiter will deactivate and cease its gain reduction. The limiter has a fixed threshold and can not be adjusted. 
safe Power Levels at different output Loads:
8-Ohm  Loads:  The  amplifier  can  operate  at  practically  any  power  level  without  risk  of  overheating.  However,  if  it  is  pushed  hard 
enough to continually light the “cLiP ” indicator, the amplifier’s average output power can reach 150 watts.
4-Ohm Loads: if the “cLiP” indicator flashes occasionally, the amplifier is approaching its maximum long-term power capacity.  if it is 
lit about half the time, the amplifier channel will probably go into thermal protection within a few minutes.
short  Circuit  Protection  - The vLP  2500  amplifiers  all  come  with  built-in  output  Short circuit  Protects.  The  output  Short circuit 
Protection  protects  the  output  devices  of  the  amplifier  from  short  circuits  and  stressful  loads.  if  your  speaker  lines  short,  the  ampli-
fier automatically detects this problem and discontinues operation for that channel. if one side of your amplifier becomes shorted and 
goes into protect mode, the other side will continue to operate normally. during short circuit protec-
tion, the "clip" Led and “Protect" Led will light simultaneously indicating amplifier fault. All channel 
output  during the “Short circuit Protection" will be interrupted (i.e. no sound out 
						

							©American Audio®  -  www.americanaudio.us  -  vLP 2500 Power Amplifier user manual  Page 12
put). Short Circuit Protection can usually be traced back to the signal output line (i.e. speaker line). check the line from the output ter-
minal of the amplifier to the speaker. if this line good, check the internal speaker connections and components. A short circuit will usu-
ally be traced to a bad cable or a bad speaker component and is rar ely traced to the amplifier itself.
thermal Protection - dual variable speed fans on the vLP 2500 amplifier provide adequate cooling. during low level output the fans 
run  at  normal  speeds. during  high  output  and  as  heat  raises,  (exceeding  90°c.),  the  fans  will  run  at  higher  speeds  to  aid  the  cooling 
process. if  the  heatsink  temperature  exceeds  91°c.,  the  amplifier  will  mute  until  the  amplifier  cools  down.  When  the  amplifier  cools 
below  90°c.,  the  amplifier  will  return  to  normal  operations.  Be  sure  not  to  operate  your  amplifier  below  the  minimum  load  ratings  to 
reduce the risk of overheating problems.
Input/output  Protection  - The  input  circuits  are  isolated  by  10k  resistors.  An  ultrasonic  network  uncouples rF from  the  output  and 
helps keep the amplifier stable with reactive loads.  
operating  Voltage  (aC  Mains)  -  The  serial  number  label  indicates  the  correct  Ac  main  voltage.  connecting  to  the  wrong  voltage  is 
dangerous  and  may  damage  the  amplifier.  Always  be  sure  the  source  voltage  for  your  areas  matches  the  required  voltage  for  your 
amplifier.
gain  Controls  -  The  gain  controls  are  located  on  the  front  panel  and  are  calibrated  in  2dB  of  attenuation  from  full  gain.  it  is  best  to 
adjust the amplifier so no “hissing” is heard from speakers with no music being played, this will ensure the lowest possible distortion 
during normal operation. 
aMpLIFIer FeatUres:
groUnd LIFt sWItCh - Applying or lifting the ground switch will change the level for background noise and hum, if the noise level 
remains the same in either position, it is better to keep the ground lift switch in the ground position. This will eliminate 60Hz cycle hum 
that is sometimes induced when mounting several units in the same rack.
oPeratIng VoL tage (aC MaIns) - The serial number label indicates the correct Ac main voltage.  connecting to the wrong voltage 
is dangerous and may damage the amplifier.
gaIn ControLs - The gain controls are located on the front panel and are calibrated in 2dB of attenuation from full gain.  it is best to 
adjust the amplifier so no “hissing” is heard from speakers with no music being played, this will ensure the lowest possible distortion 
during normal operation.
Led  IndICators  - each  channel  has  five  LedS.  Two  gree  Leds  indicate  signal  level  activity. one  yellow  Led  indicates  signal  clip-
ping. one red Led indicates protection mode for shorts/ overload. one blue Led indicates power for each individual channel. 
						

							©American Audio®  -  www.americanaudio.us  -  vLP 2500 Power Amplifier user manual  Page 13
tYpICaL Mono brIDge set-Up
speaKers
8 oHm minimum
tYpICaL stereo oUtpUt ConneCtIons
speaKers
4 oHm minimum
speaKers
4 oHm minimum
use channel 1 inputs only (XLr or 1/4” Jacks)
X
use Speakon or Banana Jacks
use the two positive binding post 
termainals (red) for speaker output.
Figure 14
Figure 13 
						

							The vLP  2500  carries  a  one  year  limited  warranty.  We  recommend  you  fill  out  the  enclosed  warranty  card  to  validate  your  purchase.  All 
returned service items whether under warranty or not, must be freight pre-paid and accompany a  r.A. (return authorization) number. if the 
mixer is under warranty, you must provide a proof of purchase invoice. You may obtain a  r.A. number by contacting our customer support 
team on our toll free number. Please contact American Audio® customer support at (800) 322-6337 for a r.A. number. All package 
not displaying a r.A. number on the outside of the package will be returned to the shipper.
1-year LIMIted W arranty
A.  American Audio® hereby warrants, to the original purchaser, American Audio® products to be free of manufacturing defects in material and work-
manship for a period of 1 Year (365 days) from the date of purchase. This warranty shall be valid only if the product is purchased within the  united 
States of America, including possessions and territories. it is the owner’s responsibility to establish the date and place of purchase by acceptable 
evidence, at the time service is sought. 
B.  For warranty service, send the product only to the American Audio® factory. All shipping charges must be pre-paid.  if the requested repairs or 
service (including parts replacement) are within the terms of this warranty, American Audio® will pay return shipping charges only to a designated 
point  within  the united  States. if  the  entire  instrument  is  sent,  it  must  be  shipped  in  its  original  package.  no  accessories  should  be  shipped  with 
the product. if any accessories are shipped with the product, American Audio® shall have no liability whatsoever for loss of or damage to any such 
accessories, nor for the safe return thereof.  
c.  This warranty is void if the serial number has been altered or removed; if the product is modified in any manner which American Audio® con-
cludes, after inspection, affects the reliability of the product; if the product has been repaired or serviced by anyone other than the American Audio® 
factory unless prior written authorization was issued to purchaser by American Audio®; if the product is damaged because not properly maintained 
as set forth in the instruction manual. 
d.  This is not a service contract, and this warranty does not include maintenance, cleaning or periodic check-up.  during the period specified above, 
American Audio® will replace defective parts at its expense, and will absorb all expenses for warranty service and repair labor by reason of defects 
in material or workmanship. The sole responsibility of American Audio® under this warranty shall be limited to the repair of the product, or replace-
ment thereof, including parts, at the sole discretion of American Audio®. All products covered by this warranty were manufactured after January 1, 
1990, and bear identifying marks to that effect. 
e.  American Audio® reserves the right to make changes in design and/or improvements upon its products without any obligation to include these 
changes in any products theretofore manufactured. 
F.  no warranty, whether expressed or implied, is given or made with respect to any accessory supplied with products described above.  except to 
the  extent  prohibited  by  applicable  law,  all  implied  warranties  made  by  American  Audio®  in  connection  with  this  product,  including  warranties  of 
merchantability or fitness, are limited in duration to the warranty period set forth above. And no warranties, whether expressed or implied, including 
warranties of merchantability or fitness, shall apply to this product after said period has expired. The consumer’s and or dealer’s sole remedy shall 
be such repair or replacement as is expressly provided above; and under no circumstances shall American Audio® be liable for any loss or damage, 
direct or consequential, arising out of the use of, or inability to use, this product.  
G.  This warranty is the only written warranty applicable to American Audio® products and supersedes all prior warranties and written descriptions 
of warranty terms and conditions heretofore published. 
American Audio®  -  www.americanaudio.us  -  vLP 2500 Power Amplifier user manual  Page 14 
						

							VLP 2500 sPeCs
Power supply: 
 Ac 100v, 50/60Hz (Japan) 
 Ac 110v, 60Hz (colombia)
 Ac 120v, 60Hz (u.S.A. and canada)
 Ac 127v, 60Hz (mexico)
 Ac 220v, 50Hz (chile and Argentina)
 Ac 220v, 60Hz (Philippines and Korea)
 Ac 230v, 50Hz (europe, new Zealand, South Africa, and Singapore)
 Ac 240v, 50Hz (Australia and u.K.)
modeL:                                          vLP2500                        
output Power:    700W rmS per channel @ 8 ohms,
       1kHz, 0.1% THd (Stereo)
       1100W rmS @ 4 ohms,
       1kHz, 1% THd (Stereo)
       Bridged mono:
       2800W rmS @ 4 ohms,
       1kHz, 1% THd 
Total Harmonic          Less Then 0.5% (20Hz - 20kHZ @
distortion (THd):        8 ohms 
Frequency                 (+/-0.5db, @ rated output power,
response:       8 ohms): 20Hz - 20KHz
Slew rate:     20v Per use
damping Factor @     + 450
8 ohm:  
impedance:               20K ohms Balanced
       10K ohms unbalanced
dimensions     17.8” x 19” x 3.5”
(LxWxH):     453 x 482 x 88mm 
Weight:     49.8lbs/22.6Kgs   
American Audio®  -  www.americanaudio.us  -  vLP 2500 Power Amplifier user manual  Page 15 
						

							©American Audio® World Headquarters:
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Tel: 323-582-3322  Fax: 323-725-6100
Web: www.AmericanAudio.us  e-mail: [email protected]
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