Creates at least somewhat of a sound channel. That mixed with my a/d/s ph30.2 and an IDQ 12" sub give plenty of accurate thump that stimulates ladies in the back seat while not sounding obtrusive from the outside. --
2004 M3 CB/Cinn SMG/HK/Premium/WidthAdj/Nav/Al Trim/Xenon/19" OEM's/V1 Hardwired/SPP Fogs/Phatbox/Alarm/Huper Optik Ceramic 40
a/d/s ph30.2/346is fronts/345is rears (woofers only)/IDQ 12" sub in Corey's Enclosure