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Old 14th December 2006, 09:31 PM   #1
gcohen is offline gcohen  Israel
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Default 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
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Old 14th December 2006, 09:56 PM   #2
AKN is offline AKN  Sweden
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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.
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Old 15th December 2006, 09:04 AM   #3
gcohen is offline gcohen  Israel
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Default 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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Old 15th December 2006, 09:07 AM   #4
djk is offline djk
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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.
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Old 15th December 2006, 09:14 AM   #5
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do all of them have equally effective heatsinking? i have been interested in the tapco for some time
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Old 16th December 2006, 09:40 AM   #6
djk is offline djk
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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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