Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 5th February 2007, 08:43 AM   #21
diyAudio Member
 
Join Date: Jul 2005
Location: North Derbyshire
Quote:
Originally posted by beppe61

And of course QSC amps are better built with better components and of course placed at a higher cost.
You don't think then that the QSC amp is designed and built in exactly the same factory as the Behrigner one then? - I would strongly suspect it is!.
__________________
Nigel Goodwin
  Reply With Quote
Old 5th February 2007, 09:17 AM   #22
beppe61 is offline beppe61  Italy
diyAudio Member
 
Join Date: Feb 2005
Location: torino
Quote:
Originally posted by Nigel Goodwin
You don't think then that the QSC amp is designed and built in exactly the same factory as the Behrigner one then? - I would strongly suspect it is!.
Yes Sir, I believe so as well.
Maybe two lines of the same design, aimed at different price targets.
Anyway the A500 looks quite well built, considering its very low price.
I can say nothing about its quality but the transformer in particular looks like a 600VA "onion" (!).
Kind regards,

beppe
  Reply With Quote
Old 5th February 2007, 02:36 PM   #23
beppe61 is offline beppe61  Italy
diyAudio Member
 
Join Date: Feb 2005
Location: torino
Quote:
Originally posted by beppe61


I correct my words.

Anyway the A500 looks quite well built, considering its very low price.
The transformer in particular looks like a 600VA (!) thing.
By the way I can say nothing about its quality.
It could be a "fake" 600 Watter ....
I am sure that QSC toroids are very good and substantial instead.
And this is an important piece in an amp after all.

Kind regards,
beppe
  Reply With Quote
Old 17th April 2007, 03:27 AM   #24
Pulse-R is offline Pulse-R  Australia
diyAudio Member
 
Join Date: Mar 2005
Location: Melbourne
this guy has done quite a bit on the A500 from the looks.

http://db.audioasylum.com/scripts/t.pl?f=amp&m=81545

not sure about if he's talking about the supply caps, or 'output' caps that he is bypassing - guess I'll find out later this week, I am getting an A500 to poke around in.
__________________
Digital is only on or off
  Reply With Quote
Old 17th April 2007, 06:09 AM   #25
diyAudio Member
 
Cloth Ears's Avatar
 
Join Date: Dec 2001
Location: Melbourne, Australia
This item from ebay was a modified A500. These mods were listed (no I didn't buy it):

1. Additional filter caps (original amp has only 6600uf per channel, I have added on 28,000uf each channel...that is like 4 times more) so that there is more raw power when it is playing in high levels.

2. There are 2 op-amps in each channel. They are for receiving balance signal, converting them into single path for volume control. Behringer uses JRC4558 with a slew rate of only 1V/us. I have changed all op-amp in both channel to Burr Brown OPA2134. OPA2134 has slew rate of 20V/us, wider bandwidth (8Mhz), and lower noise. The result is quieter, faster and clearer high ends.

3. Changed input electrolytic caps to audio grade caps. These caps are in sigal path, so they should be of high quality. I used Nichicon audio caps and Philips MKP.
__________________
Jont.
"It is impossible to build a fool proof system; because fools are so ingenious."
  Reply With Quote
Old 17th April 2007, 12:27 PM   #26
beppe61 is offline beppe61  Italy
diyAudio Member
 
Join Date: Feb 2005
Location: torino
I feel some improvements should be gained by "cleaning" the single ended path (i.e. bypassing op-amps, volume controls and even -if possible- coupling caps) and using only this as input.
I would replace the main power supply caps with bigger and better quality ones as well.
As usual, the main problem is with the available space on the pcbs.
The original caps are small in diameter (26 mm) and there are components all around them limiting the space free on the pcb.
This I do not understand.
Much better would be main caps short and large with the possibility to put at least 20.000-30.000uF/channel, a reasonable amount in general.
I believe that a little more attention in the design could have brought a nice step-up in performance, with a small cost.

Regards,

bg
  Reply With Quote
Old 17th April 2007, 06:15 PM   #27
Minion is offline Minion  Canada
diyAudio Member
 
Join Date: May 2006
Location: Cowican Bay , vancouver island
I have a schematic of the Behringer EP-2500 if someone needs it...?


  Reply With Quote
Old 19th April 2007, 05:21 AM   #28
diyAudio Member
 
Cloth Ears's Avatar
 
Join Date: Dec 2001
Location: Melbourne, Australia
Quote:
Originally posted by Minion
I have a schematic of the Behringer EP-2500 if someone needs it...?


Champion!
__________________
Jont.
"It is impossible to build a fool proof system; because fools are so ingenious."
  Reply With Quote
Old 22nd August 2007, 03:11 PM   #29
diyAudio Member
 
Join Date: Aug 2007
Default schematic EP2500

Jipieh!

Being an owner, I'd like to have the schematic of that EP2500 too.
please :-) (Can't email you yet because I just registered...)

Greetz
  Reply With Quote
Old 2nd September 2007, 03:50 AM   #30
AudioFi is offline AudioFi  United States
diyAudio Member
 
Join Date: Aug 2007
I would love the Schematic also, I blew my ep2500 a week ago.
Thanks
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Behringer A500 power amp problem, please help? emperor Solid State 36 20th January 2013 01:30 PM
Upgrading Behringer BCD2000 project, need help/advice Bonthouse Parts 4 15th July 2011 10:20 PM
Phonic Max250 or Behringer A500 for speakers 93db?? Brit01 Solid State 13 29th July 2008 07:54 PM
Which soundcard for KX Project and measuring speakers with a Behringer ECM8000? mazeroth Multi-Way 1 28th March 2006 08:22 AM


New To Site? Need Help?

All times are GMT. The time now is 03:36 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2