Connecting 2 400's to single preamp

roccus

roccus

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To connect 2 400's to a single preamp would I use an RCA Y adapter to plug into left and right inputs then a mono rca cable to the preamp for each side? Then then say the right preamp output to the right amp would use the right speaker terminals and visa versa for the left? This would be like 400 watts per channel right?
 
I want to connect 2 PL400 series 1 to a single preamp so one amp drives right channel and the other drives left channel.. sorry did not realize this was complicated
 
You can not hook the right and left channels together. You would have to bridge the amp at the input, and that's not a good thing to do, although it can be done, the lifespan is debatable.
 
Its called bridging the amps, in the service manual it says not recommended, but if you do want to bridge the amps call the factory.


Good luck with that call.
 
laatsch55 said:
You can not hook the right and left channels together. You would have to bridge the amp at the input, and that's not a good thing to do, although it can be done, the lifespan is debatable.
Click to expand...

thats the word I was looking for "bridge" wouldn't one of these bridge it??

https://www.amazon.com/C2G-Cables-S..._SR160,160_&psc=1&refRID=JQ013PQQJXDF1A056EBG

with one of these to the preamp?

https://www.amazon.com/gp/product/B0002J1LD4/ref=ox_sc_act_title_1?ie=UTF8&psc=1&smid=ATVPDKIKX0DER

There would be one for each channel left and right... what is the harm this causes??
 
Bridging doesn't work like that. You have to invert the signal on one channnel and regular input on the other channel. Then both channels of the amp are combined at the out put to QUADRUPLE the output. And you would be limited to an 8 ohm load......
 
laatsch55 said:
Bridging doesn't work like that. You have to invert the signal on one channnel and regular input on the other channel. Then both channels of the amp are combined at the out put to QUADRUPLE the output. And you would be limited to an 8 ohm load......
Click to expand...

So this has never been done with these??? hmm back to the drawing board looks like I need some more electronics educating....

OK I see it.....
http://www.bcae1.com/bridging.htm

Damn that Bob C why didn't he build them to do this???
 
Last edited:
Check a website called westhost.com. An Australian that explains things very well. He has a paper published that covers bridging to a T.....
 
You CAN bridge a PL amp, but the advantages do not outweigh the disadvantages.
 
laatsch55 said:
You CAN bridge a PL amp, but the advantages do not outweigh the disadvantages.
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Well I was thinking that advantage with a 400 would be 400 watts per channel vs 200 watts per channel but I'm not going to sit here and start frying amps to do it
 
It doubles the distortion, doubles the noise, your impedence limited to 8 ohms, ......there's a better way to get 400 watts per channel........a 700 will do 775 per channel into 4 ohms.......that's at clipping.
 
Why don't you bi-amp?

Now that we brought that up - Shay's bi. :binky: :love10:
 

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To run 2 amps with one preamp with only one output, use a Y adapter in each input. No bridging involved, just even preamp power to both amps, each driving it's own set of speakers

Bridging PL's is not a good thing
 
Northwinds said:
To run 2 amps with one preamp with only one output, use a Y adapter in each input. No bridging involved, just even preamp power to both amps, each driving it's own set of speakers

Bridging PL's is not a good thing
Click to expand...

Right but I think then you would need to run it as a bi amp set up... I was thinking of this and is why I had asked about active cross overs a bit back
 
Dear Roccus ,
before asking for amp / preamp connections ,
I suggest you to choose or make the speakers .
For instance I have 3 cases in my systems :
-Allison One powered by a PL 700 ( very hungry of power and 8 Ohm nominal impedance )
-Infinity rs III powered by a PL 400 ( 4 Ohm )
-AR 9 passive bi amped by 2 Carver M400a. ( AR 9 are disegned for bi amp )
No problem at all and great sound .
Ciao
Marco
 
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