Best Subwoofer for Magnepan speakers

How about get two Adire Rava 2. Or just make sure your subs are sealed and you will be alright. Just like heads ..two are better than one.If you have the room that is.LOL
Stereo sealed subs are where it's at.No single sub with a single woofer/ input/ amplifier going to compete with two separate units run in stereo for music.Just not going to happen I don't care how much it cost.

Magnepans need subs that can keep up. I haven't heard a ported sub that can do this well. The less distortion the better. It will be easier to mate the subs to the Maggies.When your not running both left and right channels to the same unit.

Good Luck!

REL and Vandersteen are two audiophile quality subs which will work tremedously well with either two channel or HT applications. I am using twin Vandersteen 2W's (older model, but excellent quality. Built in non-limiting 300w amps, so no need for external amp)and they blend utterly seamlessly with planars/hybrids.
Insist on a pair of subs; some may arue it, but twin subs offer a distinctly better listening experience. Used Vandy 2W's are around $6-700.00 and should come with X-2 crossover (a must for proper operation; they allow you to adjust your sub settings to match whatever amp you are running)!

I feel you might be heading in the wrong direction by adding a sub. Your 3.5 can generate natural deep and massive bass notes with more powerful amps that are operating below the clipping line, Magnepans are like politicians they always need more good power.

I have to agree with Terryakhan. Properly set up in a tuned room, and provided with adequate, quality power, the larger Magnepans are capable of bass that is deep, articulate, and fast. The speed of the Magnepan panel makes for finding and mating a sub of equal speed difficult. That said, many Magnepan users have had good luck with the Sunfire and Vandersteen subs. My advise would be to not consider doing it unless you are in a position to use a pair of them.

I have custom designed subwoofer systems that I designed and built embedded in the wall behind my Maggies. I am well satisfied with results. While this design may be impractical for most people, (eg: apartment dwellers) some of the concepts I used may be relevant.
1..Every speaker should have its own subwoofer. This might mean three if you have a multichannel rig. Five would be overkill.
2..A large area of SW cone is desirable. In each of my three subwoofers, I have a 15" and a 12" driver, stacked. The idea here is that the Maggie is a large area low excursion driver, and the subwoofer should work the same way. A line array of four 10" SW drivers would be a good choice.
3..Locate the subwoofer directly behind the Maggie(within 2 feet or less), and raised off the floor so that its center is halfway up the Maggie (centered). The idea here is that the subwoofer "plays through" the Maggie. Good "integration". I have a hunch that the subwoofer works in part by absorbing the Maggie backwave rather than projecting its own sound.