Wayne Parham Messages: 18791 Registered: January 2001
Illuminati (33rd Degree)
The Delta 15 needs a huge box for subwoofer tuning, so that's probably out. I wouldn't use the Delta 15 in anything smaller than about 5ft3, and even at that, it's really a midwoofer, not a sub. To get the low notes out of a Delta 15, you really need a box that's like 20 cubic feet or so.
The Omega 15, on the other hand, makes a capable sub when put in a moderately sized 5-8ft3 box. The Omega 15 is one of those woofers that can do midwoofer duty in a 2.53 to 5.0ft3 cabinet tuned to 38-40Hz or as a subwoofer in 5.0ft3 to 8.0ft3 tuned a smidge lower, around 35Hz.