Behringer EP1500

gcohen · 14th December 2006, 08:31 PM

Hello,

It is common to think that the Behringer EP1500 is a QSC RMX1450 clone.

Recently I have found the following.

Go to the QSC website to see the RMX1450 pictures (of its modules):

http://www.qscstore.com/rmxmodas.html

If you have a Behringer EP1500, you will see that the modules
do not look the same as in your Behringer.
Look on the volume control, look on the orientation of the
ribbon connector, look on the parts which appear and not appear
on, e.g., the module of channel 2.

So, I suggest that it is not exactly the same circuit.

Guy

AKN · 14th December 2006, 08:56 PM

Hi gcohen!

Layout differ, schematic the same.
Dual layer PCB on Behringer EP1500, single layer PCB on QSC 1450 (larger QSC RMX amps has dual layer).
Slightly smaller transformer on EP1500 I have heard.

AC coupled flying rail output topology.

gcohen · 15th December 2006, 08:04 AM

Thanks! Now I understand.

How it all started, I wanted to make changes in my EP1500.
So, I look at the QSC RMX145 schematics.

It turns out that the part number (on the PCB) are not the same
and the layout too.

What I wanted to is the following (when I am looking on the
QSC schematics):

1. Put the input directly to the (-) leg of U101:2 (bypassing the
the volume control) and disconnect U101:1 from the ccircuit.
Remove all the 30,50Hz filtering and just remain the 20K
resistor as a load for the input.

2. Disconnect diodes D102 and D105 and by that remove the
action of the "clipping sensing bridge"

The problem is that I do not see exactly which part is which,
since the numbers are not the same as in the QSC schematics.
This ask for deep inspection in the Behringer PCB.

Thanks again,
Guy

djk · 15th December 2006, 08:07 AM

EP1500 schematic is the same as the QSC, as is theTapco J-1400.

If you compare the J-1400 with the QSC you will find every part value and even the reference designators (R1, Q1, C1, etc) the same.

The Tapco amps weigh more than any of the clones, they have bigger transformers, yet are not much more $$$ than the Behringer and Alto, but are a lot less $$$ than QSC.

bikehorn · 15th December 2006, 08:14 AM

do all of them have equally effective heatsinking? i have been interested in the tapco for some time

djk · 16th December 2006, 08:40 AM

They all apear to use the same amount of heatsink, and none of them have enough for 2 ohm use, IMO.

14th December 2006, 08:31 PM	#1
gcohen diyAudio Member Join Date: Feb 2006 Location: Israel	Behringer EP1500 Hello, It is common to think that the Behringer EP1500 is a QSC RMX1450 clone. Recently I have found the following. Go to the QSC website to see the RMX1450 pictures (of its modules): http://www.qscstore.com/rmxmodas.html If you have a Behringer EP1500, you will see that the modules do not look the same as in your Behringer. Look on the volume control, look on the orientation of the ribbon connector, look on the parts which appear and not appear on, e.g., the module of channel 2. So, I suggest that it is not exactly the same circuit. Guy

14th December 2006, 08:56 PM	#2
AKN No snake oil diyAudio Member Join Date: Aug 2005 Location: In the middle of Sweden	Hi gcohen! Layout differ, schematic the same. Dual layer PCB on Behringer EP1500, single layer PCB on QSC 1450 (larger QSC RMX amps has dual layer). Slightly smaller transformer on EP1500 I have heard. AC coupled flying rail output topology. __________________ / Anders

15th December 2006, 08:04 AM	#3
gcohen diyAudio Member Join Date: Feb 2006 Location: Israel	Behringer EP1500 Thanks! Now I understand. How it all started, I wanted to make changes in my EP1500. So, I look at the QSC RMX145 schematics. It turns out that the part number (on the PCB) are not the same and the layout too. What I wanted to is the following (when I am looking on the QSC schematics): 1. Put the input directly to the (-) leg of U101:2 (bypassing the the volume control) and disconnect U101:1 from the ccircuit. Remove all the 30,50Hz filtering and just remain the 20K resistor as a load for the input. 2. Disconnect diodes D102 and D105 and by that remove the action of the "clipping sensing bridge" The problem is that I do not see exactly which part is which, since the numbers are not the same as in the QSC schematics. This ask for deep inspection in the Behringer PCB. Thanks again, Guy

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15th December 2006, 08:07 AM	#4
djk diyAudio Member Join Date: Feb 2001 Location: USA	EP1500 schematic is the same as the QSC, as is theTapco J-1400. If you compare the J-1400 with the QSC you will find every part value and even the reference designators (R1, Q1, C1, etc) the same. The Tapco amps weigh more than any of the clones, they have bigger transformers, yet are not much more $$$ than the Behringer and Alto, but are a lot less $$$ than QSC.

15th December 2006, 08:14 AM	#5
bikehorn diyAudio Member Join Date: Aug 2004 Location: toronto	do all of them have equally effective heatsinking? i have been interested in the tapco for some time

16th December 2006, 08:40 AM	#6
djk diyAudio Member Join Date: Feb 2001 Location: USA	They all apear to use the same amount of heatsink, and none of them have enough for 2 ohm use, IMO.

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