Magnepan vs B&W: Same specs, different bass?

I've also A-B'd the Magnepan 3.7's to my of Thiel CS-2.4's which have these specs:
Frequency response: 36Hz–25kHz, ±2dB.

Thiels are similar to the B&W's and blow the Magnepans away with regards to bass, trying to figure out why when the specs are so similar.

Thanks for the input guys, sounds like everyone thinks with the similar specs they should perform similarly.  I thought maybe conventional woofers with more throw might have more punch than electrostatics or some other explanation like that.

I'll try moving the Maggie's around the room a bit to see if I can get more bass out of them, but it's such a big difference I doubt I'll be able to.  I'll try to take some measurements this weekend and post them.

I'm using a Levinson 433 amp rated at 400wpc at 4 ohms which should have plenty of power, right?  =)

@markalarsen I think I'd agree, I moved the Maggie's all over the room and can't get near the amount of bass out of them...

Hey guys, I took some measurements today with a calibrated microphone and as suspected the Magnepan 3.7’s are not performing nearly as well as the B&W 803S’s below about 75 Hz. I pulled the Magnepans out about 4 feet from the rear wall hoping that it would help but didn’t make much of a difference.

Measurement Picture:
http://www.socalhifi.com/Maggie_3.7_vs_803S.png

Setup Pictures:
http://www.socalhifi.com/Maggie_vs_B&W_1.JPG
http://www.socalhifi.com/Maggie_vs_B&W_2.JPG

Thoughts?

I just followed the setup instructions from the Cardas website, here are my room measurements:
http://www.socalhifi.com/Magnepan_Room_Setup.jpg

Here's the Maggie's in their 'optimal' position, something tells me my wife won't allow this... =)
http://socalhifi.com/Maggie_vs_B&W_3.JPG

Here's the B&W's in a similar position:
http://socalhifi.com/Maggie_vs_B&W_4.JPG

Here's the measurement comparison:
http://www.socalhifi.com/Maggie_3.7_vs_803S_take2.png

Looks like moving the Maggie's definitely helped in the 40-80 Hz range, but now I've got a significant room mode around 100 Hz.  Also they still don't have the low end punch of the B&W's, maybe it's that sub-40 Hz performance of the B&W that I'm feeling?

Moved them out 40% of the room width per the instruction, seems crazy to me that these speakers need to basically be in the middle of the room to sound good?

Interesting article on placements, I'd love to mess around with it but I'm afraid I don't have the space to have the speakers 40% out into the room.  My room is also not a rectangle but more L shaped with a large opening to a dining room off to the right of the speakers which may be throwing things off.

For now I'm thinking I may have to live with the sub-optimal placement and supplement the bass with a subwoofer.