The WIBAQ: TABAQ Design with Betsy K - Page 5 - diyAudio
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Old 9th January 2013, 09:38 PM   #41
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My BetsyK measured at .3218 mh vc inductance!

Larry
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Old 9th January 2013, 09:40 PM   #42
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The Zobel will roll off the top end! Use the BSC without it.

Larry
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Old 9th January 2013, 09:40 PM   #43
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Maybe a zobel network is not needed because the baffle width is only 12.5 inches. (Still absorbing as much information as possible, really a noob at this right now)

If this is the case, then we should only need a simple resistor and inductor for the BSC.

Rparallel = Re x (10^db/20 -1)
Rparallel = 5.7 x (10^3/20 -1)
Rparallel = 5.7 x (10^0.15 -1)
Rparallel = 5.7 x 0.413
Rparallel = 5.7 x 0.413
Rparallel = 2.3541

Rparallel = 2.5 Ohms (Parts-Express)

f3 = 4560/Wb
f3 = 4560/12.5"
f3 = 364.8 Hz

Lbsc = Rparallel/(2 * Pi * f3)
Lbsc = 2.3541/(2 * Pi * 364.8)
Lbsc = 2.3541/2292.106
Lbsc = 1.0 mH

Lbsc = 1.0 mH (Parts-Express)

Last edited by RonVinyl; 9th January 2013 at 09:42 PM. Reason: Added Link Destination
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Old 9th January 2013, 09:41 PM   #44
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Quote:
Originally Posted by larryldspkr View Post
The Zobel will roll off the top end! Use the BSC without it.

Larry
Thank you Larry for the advice! We greatly appreciate it!
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Old 9th January 2013, 09:48 PM   #45
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The fewer the components the better. Less cost.
So the BSC you designed, Ron, is a 3db attenuation? That's probably all that's needed with the front port.
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Old 9th January 2013, 09:53 PM   #46
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Quote:
Originally Posted by Dumbledog View Post
The fewer the components the better. Less cost.
So the BSC you designed, Ron, is a 3db attenuation? That's probably all that's needed with the front port.
Correct, 3 dB attenuation. That is just a starting point. I am going to get a few resistors to try since this is my first BSC.
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Old 9th January 2013, 09:58 PM   #47
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FYI

Rparallel @1dB 0.696
Rparallel @2dB 1.476
Rparallel @3dB 2.351
Rparallel @4dB 3.334
Rparallel @5dB 4.436
Rparallel @6dB 5.673

Lbsc @1dB 0.3
Lbsc @2dB 0.6
Lbsc @3dB 1.0
Lbsc @4dB 1.5
Lbsc @5dB 1.9
Lbsc @6dB 2.5
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Old 9th January 2013, 09:59 PM   #48
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Or make the BSC easily adjustable so it can be tuned/adjusted for different environments and preferences. Use some sort of jumper or rotary selector to choose different resistor values for different attenuation
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Old 9th January 2013, 10:33 PM   #49
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Or save your amplifier power and eq it out. Or do the bsc at line level before amp and use much smaller/cheaper inductors and non power resistors. Bsc's burn off power and add phase altering stuff to an otherwise pure full range driver and amp.
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Old 9th January 2013, 10:40 PM   #50
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Quote:
Originally Posted by xrk971 View Post
Or save your amplifier power and eq it out. Or do the bsc at line level before amp and use much smaller/cheaper inductors and non power resistors. Bsc's burn off power and add phase altering stuff to an otherwise pure full range driver and amp.
My integrated amp does have a 5 band eq, one of which is about 500 hz, which would be convenient for this application. I do like the idea of having the zobel be at line level before the amp, though I listen to mostly vinyl using the amps built in preamp. I don't know how effective feeding a phono signal through a BSC would be.
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