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Old 31st October 2011, 04:48 PM   #1
50AE is offline 50AE  Bulgaria
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Join Date: Jul 2011
Location: Sofia, Bulgaria
Default Need a subwoofer for FR10 bookshelves.

I've been offered for very cheap small bookshelves fullrange speakers with Visation FR10 8 ohm drivers. Visaton - Lautsprecher und Zubehör, Loudspeakers and Accessories

Of course, they struggle on the lows, so I'd like to build a subwoofer for them. My questions are:
-What should be cut off frequency?
-What should be the order of both of the crossovers?
-What should be the nominal power and sensitivity compared to the drivers - subwoofer to satellite ratio?
-Because of availability, I'd like to use a visaton speaker. Can you recommend me one?

The crossover of the sub could be made active with a variable cut off frequency, in case I get a bad frequency response.
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Old 1st November 2011, 11:36 AM   #2
bjorno is offline bjorno  Sweden
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Location: Jacobsmountain
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Quote:
Originally Posted by 50AE View Post
I've been offered for very cheap small bookshelves fullrange speakers with Visation FR10 8 ohm drivers. Visaton - Lautsprecher und Zubehör, Loudspeakers and Accessories

Of course, they struggle on the lows, so I'd like to build a subwoofer for them. My questions are:
-What should be cut off frequency?
-What should be the order of both of the crossovers?
-What should be the nominal power and sensitivity compared to the drivers - subwoofer to satellite ratio?
-Because of availability, I'd like to use a visaton speaker. Can you recommend me one?

The crossover of the sub could be made active with a variable cut off frequency, in case I get a bad frequency response.

Hi,

Why not build a low footprint sub using the 8” Visaton AL 200 driver using a ported design.

IMO, best SQ if converting the most promising box(70L BR) recommended by the manufacturer to a T-TQWP.

My suggestions are: XO somewhere between 120-145 Hz using a 24 dB LP filter for the sub and for the FR 10 use a 12dB HP filter.

When placing the sub somewhere at 1 - 0.5Pi space angle: One Visaton AL 200 driver in a T-QWP will match the two FR 10:s sensitivity well.

b
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Old 1st November 2011, 01:35 PM   #3
tb46 is offline tb46  United States
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Join Date: Jan 2006
Location: Texas
Hi bjorno,

Interesting design. You may want to check, but I think in your drawing you swapped the S1 and S4 designations.

Regards,
__________________
Oliver
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Old 3rd November 2011, 12:17 AM   #4
bjorno is offline bjorno  Sweden
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Join Date: Mar 2005
Location: Jacobsmountain
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Quote:
Originally Posted by tb46 View Post
..I think in your drawing you swapped the S1 and S4 designations..
Thanks tb46, for being observant!

Agree, You're right, In the picture S1 and S4 should be swapped

b

PS: The driver offset distance is not correctly predicted in HR as the crude picture is depicting but this discrepancy is IME of minor importance...obvious noticed if simulated in MJK:s program using appropriate amount of damping material.
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