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Old 5th December 2011, 06:15 PM   #1
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Join Date: Jul 2010
Default LT/ parametric bass boost of vented enclosure

I have i Diy 2.5 Cufeet enclosure tuned to 18 Hz, by 12 inch wilson watch dog driver crossed over at 50 Hz. Now since i am using a car amp class D 750 watts, i need to boost the signal as putcompared to the balanced in output going to krell . The subsonic filter built-in amp is at 20 Hz, and i am using BFD with Q=1, Fo=20 Hz gain= +12 db.

Sounds much better now at lowest end but times the woofers seems to loose control and sound buzz buzz one note only .....its annoying some times as compared to bass from mains i.e B&W 802 but some times for LFE wobble and awe are too good too good to believe.

BTW the driver is from wison audio watch dog subwoofer.
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Old 5th December 2011, 10:19 PM   #2
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How did you tune a 2.5ft^3 ported box to 18Hz?
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Old 6th December 2011, 07:18 AM   #3
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Join Date: Mar 2010
Location: Salzburg
Default Tuning

On this page the specifications suggest that flatish response to 18 Hz is achieved by cutting frequencies above it! That's the only way I can explain the awesome 83 dB @ 1Wm sensitivity...

Regards, Ben

WATCH Dog Passive Subwoofer: Woofer: One - 12 inch Dual Spider (30.48 cm) Sensitivity: 83 dB @ 1 watt @ 1m @ 100 Hz Nominal Impedance: 8 ohms/minimum 5.6 ohms @ 1 Hz Minimum Amplifier Power: 200 Watts (for theater applications) Frequency Response: 15Hz - 300Hz Room Average Response Overall Dimensions: Height w/ spikes 26.875 inches (68.26 cm),
Width 18 inches (45.72 cm),
Depth 25.125 inches (63.82 cm) Weight: 211 lbs (95.7 kg) Total Shipping Weight (approx): 281 lbs (127.5 kg)
Wilson Audio: WATCH System (Specifications)
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Old 6th December 2011, 03:42 PM   #4
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Join Date: Jul 2010
i got the dimensions from wilson specificatons... approximately. tuned with 4 inh pipe 24 inch long. why do you think it should have greater volume ? BTW its Fs=38 HZ. QTs=0.55
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