Summing up L & R line-level for dual subs

Al,

Thanks so much for such a thoughtful post, and taking the time to do the research and the math. Truly appreciated! I'll have to digest it.

I have posted a question to Lamm to check if the outputs are buffered. Assuming they aren't, then it seems I could try 2 Y-connectors in series so to have L&R output > summed-up to one cable > divided into two RCA prongs using one to each sub. At least I could try it.

Thanks also for the tip about Transition Audio. I'm overseas, though, so that would be a second step.

I solve the issue of driving subs from stereo preouts by using an inexpensive 2-way pro electronic crossover (ART Pro Audio, Peavey, Behringer) with separate mono subwoofer output. A single sub can be driven from the crossover mono output or two subs can be driven from the stereo low outputs.

You're welcome, Lewinski. I think that in your last post, though, you may have misworded something:

I have posted a question to Lamm to check if the outputs are buffered. Assuming they aren't, then it seems I could try 2 Y-connectors in series so to have L&R output > summed-up to one cable > divided into two RCA prongs using one to each sub. At least I could try it.

Didn't you mean to say "are" instead of "aren't"? Otherwise you would be summing to mono the signals that are ultimately provided to the main speakers, as was said earlier.

Also, it seems to me that a connection arrangement in which summing is done by the subs, and not with y-adapters, would be consistent with the approach recommended by Mr. Geddes. Presumably what he is recommending is simply having both subs reproducing a mono signal (with the subs having different settings, as you indicated), irrespective of how that mono signal is derived. I see no reason for the means by which the mono signal is obtained to be relevant to what his recommendations are intended to accomplish, as long as the chosen means will function properly.

Regards,
-- Al

Gbart,

Thanks for the suggestion. I will look into those (especially if the Lamm outs are NOT buffered).

Cheers

Al,

You are right, I did mistype.

BTW, your last paragraph clarified what you meant: 2 Y connectors, each going from one pre out into both subs and letting the subs do the summing. I had not picked up on that! Thanks once again!!

Horacio