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View Full Version : JMAC....need help with the diagram...



boominbass
10-21-2003, 12:21 AM
I think u were picking up ur GF the other nite and forgot to help with this:

With 1000 RMS between them, yes ... 1000 RMS to each, no ...

External Dimensions ...
Height = 19"
Width = 31.5"
Depth = 18"
Thickness = 0.75" (3/4" MDF)
Gross Volume = 5.013 ft^3

Driver Displacement = 0.256 ft^3

Port Height = 17"
Port Width = 2.5"
Port Area = 42.5 square inches
Port Length = 36"
Port Displacement = 1.103 ft^3

Brace Displacement = 0.03548 ft^3

Net Volume = 3.61852 ft^3
Tuning Frequency = 27.9 Hz

WinISD predicts (with the same power) an 8 dB gain @ 25 Hz, a 7.7 dB gain @ 30 Hz, a 5.4 dB gain @ 40 Hz, a 3.5 dB gain @ 50 Hz, a 2.2 dB gain @ 60 Hz, a 1.3 dB gain @ 70 Hz, and a 0.7 dB gain @ 80 Hz over the recommended 1 ft^3/sub sealed enclosure.

boominbass
10-21-2003, 12:22 AM
also how would the port be 36" in length

boominbass
10-22-2003, 08:18 PM
jmac this is for 2 12"s right?? ...im a bit confused...where is the total length of the box ( 31.5" )