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RE: What is the best 30-300hz bass cab solution?

Try one of my my PPSL designs. This one is 100.5dB/2.83V/1M midband, and is usable to 400hz or so.

Driver Properties
Name: 295-120
Type: Standard one-way driver
Company: Dayton Loudspeaker Co.
Comment: Nov 2011 (New)
No. of Drivers = 2
Mounting = Standard
Wiring = Parallel
Fs = 29.6 Hz
Qms = 10.55
Vas = 128.1 liters
Cms = 0.351 mm/N
Mms = 82.29 g
Rms = 1.451 kg/s
Xmax = 8 mm
Xmech = 12 mm
P-Dia = 254 mm
Sd = 506.7 sq.cm
P-Vd = 0.405 liters
Qes = 0.36
Re = 6 ohms
Le = 3.07 mH
Z = 8 ohms
BL = 15.97 Tm
Pe = 275 watts
Qts = 0.348
no = 0.89 %
1-W SPL = 91.64 dB
2.83-V SPL = 92.89 dB
-----------------------------------------
Box Properties
Name:
Type: Vented Box w/ Active HP Filter
Shape: Prism, square
Vb = 4.502 cu.ft
Fb = 27 Hz
QL = 6.24
F3 = 27.1 Hz
Fill = minimal
No. of Vents = 2
Vent shape = rectangle
Vent ends = two flush
Hv = 10 in
Wv = 2 in
Lv = 29.49 in
-----------------------------------------
Active 12 dB/oct. HP Filter
Fx = 27 Hz
Qx = 2

Here is a picture of Asylum member Les Hudson's efforts:

This is roughly a 24" cube, and is -3dB at 27hz.

PPSL stands for push-pull slot-loaded and is done to reduce distortion. Art Welter did a test at DIYaudio and got a 30dB reduction in 2nd harmonic and a 20dB reduction in 4th harmonic in the bottom octave at full power. 20dB is a 100:1 reduction!


Edits: 04/07/12 04/07/12
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