Edward J M
Senior HTF Member
- Joined
- Sep 22, 2002
- Messages
- 2,031
In order for the woofer to really benefit from an increase in additional port area, some significant port compression would need to be occuring in the existing product.
SVS never felt the single 4" flared port was inadequate for the ISD woofer, so I really doubt there will be any huge output increase across most of the pass band.
However, the native tune for the PB12-ISDv is deeper than the PB12-ISD, so you might see a more significant increase in clean output in the 18-22 Hz region. Again, this would be more a result of the deeper tuning point than it would be from any increase in port area per se.