Two subwoofers in smallish HT room?

Eldartford

Our systems are somewhat similar...planers, three subs with six large drivers. I suspect the difference that I measure and you don't are related to X-over and mains settings.

Sounds like you run the Maggies full-range thus always the same at their location with the only change being at the subs location.

I use fixed points which changes output freq levels at both locations having greater effect on measurement..at least in my findings.

My Duetta Sig's have an in-room rise of 2db at 30hz and then a roll-off to 25hz...the lowest setting on my X-over is 35hz and the blend between the mains (run full-range) with 35hz X-over to the sub is a little much in my room...a new X-over {maybe one of the digitals) with more choice of filter would probably benefit.

At this point, I x-over at 50hz with 6db slope.

Well, I guess I have gone far off topic...sorry

Dave

Sogood51...My SW systems are built into the wall behind the Maggies, and "play through" the screens. So they are not moved around. I pull the Maggies out 4-6 feet when in use.

I do not run the Maggies full range. I think that getting the really LF signal out of the woofer is the main reason to have a SW. My X/O is 24dB slope.

The Behringer DEQ2496 analyser that I bought recently has really helped me understand a lot of things about my system that I previously could only guess at. I recommend it, and a crossover that you can diddle from the listening position. After the RTA shows you what your problems are, turn it loose in AutoEq mode, and be amazed!

A question was raised about using subs of different sizes, but seems to have been dropped.

I was looking for a second Velodyne HGS-10, when an opportunity to buy a local HGS-15 arose. The HGS-15 was delivered by a system integrator who is very familiar with high-end equipment. He recommended I set my pre-amp to send everything below 80 Hz to the sub. Relieving the smaller KEF 102/2s of handling these frequencies really opened them up; I was surprised that the effect was the same with the 104/2s. The sub sits on an Auralex SubDude. I set all speakers, including the sub, to equal SPL, using the C scale of my Radio Shack sound level meter with slow integration. The pre-amp generates white noise for this purpose. The result is seamless open sound without boom or heaviness, and a grand sound stage with precise imaging.

Now the question: Is it worth hooking up the HGS-10 next to the left 104/2, or should I move it downstairs to use with a pair of 102/2s, and someday look for another HGS-15. The room is 14' X 19', with an opening leading to a dressing area and bathroom. The existing setup seems quite free of peaks, and the single HGS-15 is quite able to deliver the goods for movies. Stereo music is about as good as I've heard.

db

db you now own both..Feel free to experiment, by doing so can only increase your experience and may be beneficial later on..I do feel your results will have you placing the hgs 10 in the lower level..Tom

I design rooms with multiple subs often. I agree with Rives about using two subs and room modes. They know what they're doing. This is one of the hardest things to get right in any home theater. I really dislike locating a sub that's near my seating area even if the bass is great. I strongly believe that the room's low frequency room behavior needs to be looked at first (test the room, our ears can easily deceive us) and a few questions answered:

1) Were you happy with the bass except for the low output? If you were happy except for the output I'd get another bigger sub and try it out using the processors crossover. The then play around with placement if needed.
2) The Vandersteen needs it's own crossover and your main L/R amplifier as per it's instructions unless you carefully changed it's hook up. It makes it hard to use it as an LFE.
3) If you still want to use two Vandersteens (or any two subs), although very good subs, their hook-up make them problematic to use. I'd probably try two identical of a different brand. I'd need to carefully set them up by taking measurements which can be done with a simple Radio shack meter, a free audio generators through your computer as a source or a very good CD that has very closely spaced frequency bands and a piece of graph paper. It's time consuming but very enlightening about bass performance.