Axiom Home Page Forums General Discussion Home Theater Thoughts on multiple subwoofer placement

Hi CV,

I was skeptical about having two subs providing a better FR across the different seats in our HT room. That skepticism quickly disappeared when my second EP500 arrived. I placed both subs under the projector screen, on either side of the center channel and about the same distance from it as from the M80s (same look as in dllewel's room that is on the main Axiom page). I simply used the frequency sweep from the SMS-1 and it was immediately obvious that the peaks and troughs were much less pronounced compared to the situation with the single sub. The FR curve looks virtually flat with this placement in our rectangular attic room with insloping side walls. I just kept this arrangement rather than moving the subs to mid walls. I think this is also Jason's advise above; simply place them where they seem to be conveniently placed and start from there. In my situation, it worked out very well. Good luck.

I appreciate the feedback, guys. Mid-wall on the sides is actually very convenient. The side walls are where I have space to play with. I don't think I can actually fit one on the front or rear wall.

I'll have to see about REW. I don't have a laptop, but my computer is in the next room. Would it be possible to use it that way, going back and forth between rooms?

I'm not sure how much effort I want to go to in my current room, but it would be nice to get my feet wet for when I do move my system.

The computer in the other isn't a problem. I am doing the same thing, you just need long enough RCA cables to reach the receiver from your PC for the signals to be sent; if you want to use the signal generator in REW, which is the most convenient way with the PC in another room.

I have found my onboard sound card is very lacking in the lower frequencies as well as the higher ones, it drops off substantially below 70 and above 12khz. I have just bought this external card so I can use our laptop and take it along with me to help set up other Ht systems as well. I will let you know how it works out, hopefully later tonight.

That would be great. It looks like it could be a decent, affordable solution.

I'm not sure if I have two RCA cables that long or not. I know I have at least one.

You only need one then a Y splitter to feed the left and right as it is a mono signal any way.

Charles, since you have Dr. Toole's new book you'll probably get more good info from that, especially Chapter 13, "Delivering Good Bass in Small Rooms" from about pp.222-236, than we can offer. Yes, as he points out, the positioning of two or more subs at opposite mid-wall locations is most effective in rectangular rooms without large openings to other connecting areas. In other situations he emphasizes that taking measurements and then following with corrective electronic room equalization will give better total results than simply following basic placement suggestions automatically as a complete solution. So, those who have either separate room equalization equipment or built-in processing such as Audyssey MultEQ which equalizes subs should also experiment with that, using various sub locations.

You remembered that I have the book. Now if only I had remembered. I will definitely have to get some use out of it. I'll have to throw Audyssey back into the mix when I'm playing around with everything. Thanks, John.

Those things are freaky as hell. I hate those ads. Wait, I hate all ads. Praise be to TiVo!

I had the cable problem until I bought these. http://www.hsuresearch.com/products/uls15dualdrive.html

Wireless subs. They sound awesome. I only have 2 but you could add as many as you want.