Magnepan 1.7 and Subwoofer help/recommendations


I seem to have gotten myself into a bind with purchasing a subwoofer. Hear me out. I recently acquired myself a pair of Magnepan 1.7s, and they sound great. The problem is at about 90hz, the speakers completely fall apart. Obviously, it's practically incapable of producing frequencies below 30hz, which is fine with me, but my problem is that at about 50-80hz, it's a got a big honking hump of bass that overpowers a lot of the details in the mids and highs. It's like they know that they're about to give out, so they give one last big push. I would honestly rather have less bass in that area, which is what leads into my subwoofer problem.

I use my Benchmark DAC1 USB as a preamp, using the XLR outs going to my Bryston 4B with only XLR/TRS inputs. After having read some suggestions on subs that match well with Maggies, I made a list. Practically the #1 suggestion I saw was Vandersteen 2wq. I saw one online yesterday used for a good price, and I called Vandersteen, and they said that in order for me to set it up, I would need to purchase the M5 crossover, which would cost quite a bit of money ($600 minimum), which I would rather not spend. On top of that, there is only 1 Vandersteen dealer that I know of in Canada, and they haven't called me back as to whether or not they have the M5.

After looking online at a bunch of options, I've gathered that all of them pretty much only have RCA ins and outs. So, my question is: Where can I find a subwoofer that will a)match well the Magnepans
b)I can hook given the limitations of my system
c)Under $800 used
d)Goes all the way down to 20hz (Kind of just a bonus, not really necessary)

Presumably someone here would know more about this. If you do, please help me out and offer some advice. Thanks in advance for any responses.
ninjasquirt
Unless you are looking for really deep bass, I would like to suggest that you try using Dirac Audio Processor or similar DSP software. I have Magnepan 1.7s driven by a Linn amplifier (100 w/ch @ 4 ohms). Without using Dirac, I have a 5dB peak at 75 hz and a 5 dB drop out at 150 hz and 250hz. Both of these distortions are well corrected by the Dirac Audio Processor. The processor allows you to tune the speakers to fit your taste (while still respecting the physical limitations of the speakers). I bump up the bass about 2dB and roll it off starting at about 55 Hz. This provides a very satisfying sound for classical and jazz recordings. Violas, cellos, and string bass all sound very full and natural. Dirac also mellows some of the glare in the upper treble of violins. Dirac provides a 14 day free trial. All you need to try it is a calibrated microphone.
Getting deep bass that matches the smoothness (and therefore subjective "speed") of a pair of Maggies is a challenge. You see, dipoles inherently have smoother in-room bass than monopoles do.

In going from two dipole speakers to a single monopole sub down low, many people can hear a mis-match. They usually blame it on the sub being too "slow", but the real culprit is what the room interaction is doing to the sub's output; namely, imposing a highly audible and detrimental peak-and-dip pattern on it. This is a virtually inevitable acoustic problem, and imo the acoustic solution would be to use multiple smaller subs... two being better than one, and four better than two.

You see, the in-room smoothness improves proportionally as the number of separate in-room bass sources increases, and you can think of a dipole as two monopoles (back-to-back and in reverse polarity, with a wrap-around path length separating them). So four small subwoofers would be a fitting bass system for use with two dipole speakers, from the standpoint of extending the smoothness and "speed" of the dipoles down into the low bass region, adding chest-thumping impact along the way.

Given the $800 budget, it might make sense to start with two small subs, and plan on adding two more as the piggy bank recovers.

Duke
dealer/manufacturer
Do you have room for a Magneplanar DWM? I've heard 'em, and blending one or more with Maggie panels is a slam-dunk.

I think they're $595 ea., so adding one is well within your budget. There's a 30-day trial period with full product price refund (i.e., no restocking fee).
"Given the $800 budget, it might make sense to start with two small subs, and plan on adding two more as the piggy bank recovers."

I'm for 2x SVS SB 1000 [2x$500].High and low level inputs,variable 50Hz-160Hz low pass filter,80 Hz high pass filter. Plenty of options to integrate the subs.
I had Maggie 1.7's and never had a problem with bass down to about 40 to 50Hz. After that, they were anemic. Also a little too hot on the treble end.

I traded up to Maggie 3.6's about 18 months ago and, in the last month, added one Magneplanar DWM.

Johnnyb53 is right that the DWM blends in well and you can have fun moving it around until you like what you hear.

I was surpised how much better it made the 3.6's sound. Better soundstage, better high end and more clean bass.

I am considering buying a second DWM.