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Old 1st April 2009, 10:54 AM   #1
diyAudio Member
Join Date: Mar 2008
Question How can I wire my amplifier so I can bridge 2 channels together?

Hi All,

I have an Arcam FMJ P7 (7 x 150W/8 and 230W/4) amplifier which uses 2 x 1500VA transformers. I wanted to use 6 of the 7 channels to create 3 high powered channels, how would this be done?

The manufacturer says it does not support bridging, so I gather some wiring changes need to be done.

Do all I need to do is invert the signal?

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Old 1st April 2009, 06:35 PM   #2
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east electronics's Avatar
Join Date: Jan 2006
Location: Athens GREECE
Default well seems

that i miss something here.....

for example if your amplifier features 2x1500VA transformers would please tell us where exactly you connect this amp because from this ratings it cannot be connected to a normal socket ...

3000 VA is half the power of a coocking stove or 2/3 of a water boiler and so on .....
there is got a be something wrong here ...

then again if this is a home theater amplifier the unit is not designed for a thing like that ...

the power from amplifiers like that is way overestimated and the SOA is even worst ...

for bridging technicues you may look at esp pages

good luck ......

AndrewT once said :
"should i duck now or wait for the smoke first ?"

imagine ....andrew is a nice guy !!!!!
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Old 1st April 2009, 08:54 PM   #3
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ostripper's Avatar
Join Date: May 2008
Location: Smoky Mountains , Tennessee
Either you are filthy rich or brave...

The manufacturer says it does not support bridging, so I gather some wiring changes need to be done. [ WTF]

Don't touch it.. it is a 5000$ amp!!!!
It has 22A per channel peak power , so it does have 3kva
The only bigger PS than that is the genesis stealth with

if you want more power.. build a 800$ 500w+/ch aussieamp or something.(2 1kva +-100v rails)
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Old 1st April 2009, 09:13 PM   #4
expert in tautology
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bear's Avatar
Join Date: Apr 2002
Location: New York State USA
Only amp??


My Symphony No.1 amp is rated at 180w/ch 8ohms and uses >4kva transformers. Since 1990. Do I get a medal for being first??

Check my website.

I also used ~500,000ufd of filter cap, 1/4" solid copper buss bars and 400 amp Hexfred diodes...

Seems to work ok...

_-_-bear -- Btw, I don't actually know anything, FYI -- every once in a while I say something that makes sense... ]
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