Magnapan 3.5R and Sunfire Subwoofer ???

I hate to be the pessamist,but, I had 2 sunfire Archetectural signature subs, these subs had only 1 active driver, no passive radiator,2700w amp. I tried in vain to get them to mate w Apogee Acoustics Diva's, which are very similar to your maggies. I previously owned 3.3's. There is NO way the subs could keep up w the panels, I hadthe x-over @ 30hz. They really made the vocal range sound "congested",when they were in use. Sounded ok for home theater, but not critical listening. my rm is 15x25x8.I solved the problem by buying Dunlavy SC-VI

Hello,
Hopefully you have not already bought the Sunfire sub as there are indeed other subs to investigate. I use a Velodyne ULD18 with Magnepan 3.5 and this combination works very well. There are none of the problems at all as Sscot had with the Sunfire. I cross this over at 50hz but ideally would like this even lower. When I ultimately biamp the 3.5 panels, I will take the sub lower.
John

i have 3.5s w/ Velodyne uld15II. Works great! Id like 2 of them.

I agree with Sscot and Jafox. Sunfire sub is ONLY for Hometheather where fast responses are needed (sudden thunder and tighten bass). Your Magnapan is too slow and very sweet in response (bass deep and reverb) thence they are not married too well.

Go for Hsu research or B&W.

Geeez Jamesbh11 ..you have made two post and neither makes any sense to me! Magnepans are too slow? Dude you have got to be kidding! Normally it's the sub that sounds slow with these speakers. Please get out more often my friend!