How to best connect active sub to int amp?


Hi,

This could be a dumb question, but it is bugging me so here it goes:

I have an integrated amp (lfd) which doesn't provide a separate connection for a sub.

What is the best way to connect my sub? If I connect it to the left or right channel, won't it create a different load across l and r channels and thus affect the sound?

Thanks!
mizuno
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I run my sub via the speaker outs. I only have 2 so I have the main connected via bananas and the sub via bare wire.
If the LFD has pre-out jumpers you can insert the sub there, using a Y-cable (aka splitter, aka one in, two out) there, instead of the jumpers. Run one of the splitter outputs back to the main in on the amp, and one to the sub, from each channel. If the sub only has one input, you will need a Y cable at the other end as well, to sum the L & R channels. Or if your sub has high (speaker) level inputs, you can run the speaker output to the sub and then to the main speakers.
If the sub only has one input, you will need a Y cable at the other end as well, to sum the L & R channels.
No, in this case Michael's almost invariably sage and astute advice is incorrect. Doing that would result in the L & R signals to the main speakers also being summed.

If you are just using one sub, and it does not provide separate inputs for L & R, you'll have to connect to just one channel, which may represent a significant sonic compromise. A way around that would be to connect some sort of buffer stage between the pre-outs and the sub, and sum its outputs together.
If I connect it to the left or right channel, won't it create a different load across l and r channels and thus affect the sound?
Not if the input impedance of the sub is far higher than the output impedance of the outputs of the integrated amp that are being used to drive it. That will be the case if the powered sub provides speaker-level inputs and is driven from the speaker-level outputs of the amp. It will USUALLY be the case, also, if the powered sub provides line-level inputs and is driven from line-level outputs of a solid state integrated amp (or preamp).

Regards,
-- Al
The REL system of connecting it to the speaker outs of the amp works great...positive left and right and one negative. It presents a very high impedance (100,000 ohms) to the amp so it doesn't disturb anything.