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commsysman
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Joined: Apr 4 2006 - 11:33am
Subwoofer to use with PSB Image T6 speakers

I am using a Musical Fidelity M3i amplifer with Psb Image T6 speakers, and am getting pretty good bass for most listening, but they roll off at about 40 Hz.

I am wondering what kind of subwoofer would work best with them to extend the bass for listening to pipe organ music, big kettledrums, etc. that go really low.

I guess I need a subwoofer that has an adjustment for its upper frequency limit so I can try to keep the sub and main speakers from overlapping too much. Also, this amp does not have a subwoofer output, so I guess the signal for the sub will have to come from the amp output terminals.

The room is medium-sized, about 12 x 24 feet.

Any suggestions?

jackfish
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Joined: Dec 19 2005 - 2:42pm
I love the Rythmik F12 or F15 for music

and these sealed, low-Q, servo-controlled, PEQ subwoofers integrate well with most loudspeakers and rooms.  Your integrated amplifier has preamp outputs so you can feed a line level signal to the subwoofer which will be much better than using the high level signal from the amp speaker outputs.  I would start with a low pass filter setting on the subwoofer of 40 Hz and run the T6s full range.  You can then experiment with the subwoofer frequency setting above and below 40 Hz to see what sounds best.  There should be a point at which there is good integration of frequencies from the inherent low frequency rolloff of the T6s and the low pass filter frequency and slope of the subwoofer.

commsysman
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SUBWOOFER

Thanks for the information; those look very impressive; I am especially interested in the D15. It sounds as if it is quite well-implemented.

I use Vandersteen speakers and subwoofers at my other house, but those require a de-emphasis filter in the cables between preamplifier and power amplifier, and that is a huge pain in the butt.

With those things, not only do you have to experimentally determine the exact input impedance of the power amp  on the test bench (the spec sheets for the amp are often WAY off), you have to buy some expensive capacitors to fabricate the filters/cables and of course you need separate preamp and power amp in the first place. I have them all set up to work there, but never again!

Thanks again!

mav52
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I would like to second the

I would like to second the Rythmik product. I use the F12SE in a 25x14 room.

BillB
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Joined: Aug 15 2007 - 2:04pm
Anticipation

I am waiting on my Rhythmik F12SE.  I ordered early December, it's expected to get to me late January, there's a supply lag for the manufacturer currently.

commsysman
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SUBWOOFER

I did a lot of research and ended up deciding that I really wanted the Rythmic subwoofer, but they are all too damn big for the space I have. There is really only one place I want to put it, and I am pretty much limited to a maximum depth of 16 inches for the sub itself.

After a lot of looking and considering various designs, I bought the NHT B12d Subwoofer. It is an Acoustic Suspension design, which is inherently less efficient and requires more power than a bass reflex (which most subwoofers ARE), but is also less likely to be subject to resonances at some frequencies and overall non-linearity.

Anyway, it looks like a good one, and it is 14x14x14", which is a winner for my space problem. It has a 500-watt amplifier and is supposed to be -3db at 27 hz, which is not too bad. 

I have heard a lot of NHT speakers over the years and they consistently are outstanding, so I think it is likely to be a well-designed unit that will give me the performance I want.

I should have it at the end of next week, and we will see how it peforms.

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