Subwoofers

I am looking at theSVS subs does aanybody have experience with them? 

I'm also thinking of trying magnepan DWM bass panel. 

My system is strictly two channel audio just for music.   A booming subwoofer is not what I'm striving for.  It has to blend in with the music.  I'm intrigued by the magnepan DWM bass panel but just not certain yet.  I've done research on the suggestions all of you have given me, thanks for the suggestions. 

I've decided to go with two rythmik F12G
powered subwoofers.  I need to set them up through my Quicksilver Line stage preamp.  My question is with one set of outs on the preamp what is the best way to split the signal ? 

Mike 

My two rythmik audio subwoofers are arriving today.   My listening room is 
20' long by 14' wide and ceiling is 8' high. 
My gear is on one of the 14' ends.   Anyone have advice about placement? 
As a reminder I'm pairing them with Maggie MG-IIIA's. 

Mike 

I just plugged them into the system,  I'm going to have fun playing with them.   I can tell a difference immediately.  I'm listening to Art Pepper now sound is much fuller.  Will have more time this weekend to adjust them and position. 
Thanks for all the input everyone. 

Mike