Subwoofer crossovers

Hevac, the LFE channel on the NHT is summed to the stereo channels. It does not override it. Works like a charm. It was the only device I could find that could so this. Marchand offered to custom build me a 3 in 2 out Xover for a lot more money. Unfortunately NHT no longer makes the x2 but they show up used occasionally.

Re:

Marchand x-over. I just want to clarify my experience. I bought a used Marchand that had been re-tubed by the dealer, but it was still noisy. I returned it and bought an X2 for interim use while I decided how to proceed with a permanent x-over solution. The X2 turned out to be good enough to keep - so I did.

However, this shouldn't be taken as a thumbs down on the Marchand. It's entirely posible (maybe even likely) that the issues I had were with that particular unit, especially given that it was used.

I don't think anyone should extend my experience with that unit to an evaluation of that model. I certainly don't.

Marty

For a two way X-over at low cross-over point tubes would probably not be your best bet. I was considering a custome made (i.e. LFE channel added) version of the (cheaper) XM-44.

Sure, but to suggest Hevac should cut off his $40,000 speakers with 11" woofers at 80Hz and reproduce this range with two EQ'ed subs instead makes no sense. Now, if you believe a sub / satellite system has big inherent advantages that is a different discussion. But once you have sunk a lot of cash in a full range speaker, you might as well use it. Keep in mind that going up the foodchain in a speaker lineup usually involves getting bigger cabinets and woofers. If you opt for a sub / satellite configuration, get a cheaper model and deploy the savings towards subs.