I'm trying to figure out a high efficiency bandpass subwoofer design
(dual parallel) and am looking for any pointers. The aim to be
lightweight, *efficient/loud* and small enough to be hauled by a
bicycle!. Sound quality is not paramount, but it must be half-decent
playing house or maybe some reggae. It will probably be driven by a
150-350 watt class D amp.
I've been looking at the Eminence Deltalight 12" driver and have tried
to model it with WinISD beta, have a look at these screen shots of the
simulation:
1) Relative gain
http://www.biggerbyfar.com/subwoofer...s_box_sim1.gif
2) Phase plot
http://www.biggerbyfar.com/subwoofer...s_box_sim2.gif
3) SPL @ 100watts @ 1m
http://www.biggerbyfar.com/subwoofer...s_box_sim3.gif
4) Group delay
http://www.biggerbyfar.com/subwoofer...s_box_sim4.gif
The gain seems good, but I'm not sure about the group delay - is it
normal for a bandpass??
All comments appreciated, the more in depth the better! Is this a
suitable driver for this or have I gone up the wrong path. The Qts is
0.39 which some people seem to think is ideal.
Cheers!
Paul.