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Re: B&C Sub designsOld (Blue Trace) vs New (Green Trace) with 8" Port Wall:[ATTACH]150811[/ATTACH]8" (Green Trace) Port Wall vs 12" (Teal Trace) Port Wall[ATTACH]150812[/ATTACH]If I had a +3dB bump at 54.4Hz with a .60 Q (BBS FDS 336) I can pretty much smooth out the response.The biggest thing regarding the re-design is the lack of port choking that occurred in the older boxes. We started with the 8" wall version, took measurements and then replaced the 8" wall with the 12" wall. I used no HPF on the measurements and set the LPF to LR24 105Hz. The overall SPL was improved not by amplitude, but by usable amplitude. The old design began to really choke at 50Hz and abruptly cut off at 45Hz. The new design extends to 30Hz with no choking.My biggest challenge now is the lack of weight... it really wants to dance around as a single cabinet!
Re: B&C Sub designs
Old (Blue Trace) vs New (Green Trace) with 8" Port Wall:
[ATTACH]150811[/ATTACH]
8" (Green Trace) Port Wall vs 12" (Teal Trace) Port Wall
[ATTACH]150812[/ATTACH]
If I had a +3dB bump at 54.4Hz with a .60 Q (BBS FDS 336) I can pretty much smooth out the response.
The biggest thing regarding the re-design is the lack of port choking that occurred in the older boxes. We started with the 8" wall version, took measurements and then replaced the 8" wall with the 12" wall. I used no HPF on the measurements and set the LPF to LR24 105Hz. The overall SPL was improved not by amplitude, but by usable amplitude. The old design began to really choke at 50Hz and abruptly cut off at 45Hz. The new design extends to 30Hz with no choking.
My biggest challenge now is the lack of weight... it really wants to dance around as a single cabinet!
