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This is more a DIY project.
Has anyone used ONE plate amp to driver a stereo subwoofers. One under each speaker. Yes it would be technically a "mono" signal going to both. But the reality is I cut off the FR low and it all gets very non directional anyway.
This way I could get one really good amp as suggested below.
I tried several setup arrangements in my room and it seems right under the speakers is the best place. Because there is a dress between the speakers and the bed is three feet away in front between the speakers. The bed is acting as a bass trap between channels.
Follow Ups:
I used two (different) passive subs connected to a single plate amp for a while, and it sounded great - best placement is the subs on the sides of the room, facing eachother, half of the room lenght. Be sure to keep the crossover around 60Hz or less.
One problem could be the plate amp not being able to drive the lowered impedance and overheating - altough that never happened with mine.
I really don't see a problem. The amp channel doesn't know or care what signal it's amplifying. A stereo amp is basically two monoblocks in one box.
You want to split the signal and run the signal to both the left and right inputs of the amp, then power two subs... right? Should be fine...
One plate amp for two subs however... don't know how long that amp will last... unless the two drivers are not going to strain the amp.
Hi airtime,
Your idea reminds me of my DIY stereo subwoofer project that's different than yours, but still thinking outside the box ;-)
I pulled the stock plate amplifiers out from a pair of KEF subwoofers, ordered two custom-fabricated rigid resonance-dampened 1/8" steel plates to cover the enclosures cut-outs, installed a stereo set of Edison Price Music Posts on the back panels in order to match my B&W loudspeakers binding post upgrade, upgraded the stock drivers, and replaced the four plastic feet with a set of three Madisound Tiptoe spikes.
The two stock plate amplifiers were replaced with a Lexicon (made by Bryston) stereo power amplifier, and an old-school Nakamichi mobile electronic crossover powered by an external Zerozone linear power supply. The crossover I/Os and power amplifier outputs are connected in full stereo for better low frequency soundstage and ambient information, and the original integrity of each stereo channel remains intact within the signal chain rather than summing the stereo signals, which I found to sound inferior, perhaps due in large part to inter-channel phase issues, among others.
Most notable to mention is the crossover and stereo power amplifier components are completely isolated from the detrimental effects of the subwoofer enclosures and drivers, including the magnetic influence of the driver magnets in close proximity to the plate amplifier circuits, which have always been downsides in my opinion when it comes to a plate amplifier affixed to the back panel of the most vibration prone audio device within a typical system.
Well it looked like fun. And I was enjoying reading it until the end when, as with many of our DIY projects, it reverts back to the parts pile.
But thanks it was a good read.
I've been farting around with the sub position. I may have found that it likes being under the speaker on the more "open" side of the bedroom.
Subs are funny that way. They have their comfy spot.
Parts piles can be a good thing for audiophile-system optimizing, and custom system-tuning efforts...
Sounds really twisted and coompicated, but possible.
Ideally however you should EQ each sub individually, and this implies separate amps.
I'd think a far better solution would be a plate amp with EQ driving 1 sub. That will give you more than enough trouble. :)
Best,
Erik
Not sure if this is what you mean, but my powered towers each have a sub with a 125watt plate amp. I split the mono sub signal from the a/v preamp and send it to both subs. It sounds amazing.
It's a different way of doing the mono signal.
I feel I have to do stereo subs just because of the room furniture (mainly bed)
What crossover frequency do you think you need? If it's <60 Hz, mono should be fine.
I have it set pretty low. But with those dials it is only a guess-estimate. I would say at around 60hz or lower??But by using the one amp I could get a better amp. Like the one Kal suggested on a thread below.
Edits: 10/12/16
Yes, I use two channels of a Crest driven by a mono crossover to dual 15s in each corner of the room
At one point many years ago I had a system with two acoustic suspension subwoofers, one of which contained the amplifier and the other was a slave. I placed them underneath my satellite speakers. Here is a picture.
.
Now, I also use two subwoofers, but each has its own amplifier so the pair is set up in stereo. As far as imaging and soundstage are concerned, I don't think it makes any difference whether the bottom octave is reproduced in mono or stereo. Here is my present system, which certainly sounds a lot better than my old system, but it's because of better speakers and a different listening room.
Edits: 10/11/16
They certainly look good in your set up.
They are really accurate, tight, and fantastic. I've never been more impressed with subwoofers than I am with these Rythmik servo subs. They are well worth the price. Incidentally, when you buy a pair you get a 10% discount. I didn't know that so it was a nice surprise.
Best regards,
John Elison
The Swarm does it (one amp, 4x subs)."A single high quality shelf-mounted amplifier drives The Swarm, and the subwoofer modules are connected in series-parallel. A second amplifier can be added if stereo operation is desired."
Edits: 10/11/16
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