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Anyone with experience adding a second sub to enhance the rear and/or center channels? If so,how did you configure it, and does it make a significant difference? Thanks in advance for your help.
Well, I have a total of 5 subs in my HT setup, and currently have three running on front L+R, and two on Rear L+R. Processor has center "small" "no sub" Front "Large" and Rear "Large". So center + LFE bass gets routed to the front.The front subs are 2 Polk SRT's, and one Sunfire True Sub. The SRT's are great, but begin rolling off at 20Hz or so. By tossing the Sunfire into the mix, setting it's xover to 35Hz, it adds to the bottom end. Also, I'm spreading the bass over 3 subs...great dynamics! In this configuration, the system is capable of 125dB from about 18Hz up.
I have tried the following:
Sunfire run off the center channel. That means center was set to "Large". This was a pretty good configuration. The center channels didn't seem to mind the "Large" setting.
Sunfire dedicated to LFE. Set Sub to "On"; Center to "small", everything else "Large". I felt that system dynamics took a bit of a nosedive at higher SPLs; it definitely sounded strained when asked to reproduce 110dB and greater. I'm sure that a more capable sub would work fine in this configuration.
I think that a sub (or two) on the rear channels adds some great effects. More and more movies are utilizing lower freq's in the rear channels---not only action movies.
Hope this helps?
Hi JeffNot sure what you mean by a second sub. If you mean a stereo pair (which will not play stereo at those frequencies) then yes. The more loading you have the better - helps combat all those nasty resonances that all rooms have. However I have found the quality of driver is most important. If you want good clean bass the drivers must be capable of moving the air without cone break up, something not many can do. I've ended up with a pair (each in their own enclosure) of Alpine DDW -F30A car speakers and am hearing very clean bass through the main system. In the surround sub I'm using a pair KEF B139's in their own transmission line enclosures (not 100% successful so not recommended).
To summarise, get good drivers first, then double up next.
Hope this is helpful.
John
I am referring to 5.1 surround. I already have a sub for LFE. I am thinking of adding a separate one for the center & rears, possibly taking the line level directly from the DVD player although not quite sure how this would sound. I can't take the speaker levels from my center as I have to set that to small or it will become to stressed at full range.
doesn't your pre/pro send the excess LFE from the center to the sub output line when you set the center to small? Thus, the LFE you're looking for is in the sub line level. You don't have to fiddle with major acrobatics here (unless you're bored). Just "y" the line level LFE to 2 identical pairs of subs. I have mine on oposite ends of the length of the room which's responsible for the terrible 60Hz room modes (acoustic spike). This actively destructively cancels them out. i can't speak for your room, but mine is happy. If you're fortunate to have an acousticly good room, you may want to either stick to one or stack the two.
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