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Old 13th January 2005, 02:31 AM   #1
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Default 2 x 10" woofers - enough low freq SPL?

If I have a 10" woofer capable of 94dB at 25Hz (within Xmax), then adding a 2nd woofer (the other channel) will allow 100dB. If I then estimate 10dB boost due to boundary reinforcement, then I can expect roughly 110dB levels at 25Hz. My point is that 2 x 10" woofers (a stereo pair) should produce ample volume for a typical listening room.
Rather than going to subwoofers which are always a compromise with location and integration to satellites, I think a 3 way system with a 10" woofer is the best solution. Any thoughts?
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Old 13th January 2005, 02:58 AM   #2
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If you want only 25 Hz, then it's a good solution for you. 110 dB is enough.
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Old 13th January 2005, 03:18 AM   #3
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Default Re: 2 x 10" woofers - enough low freq SPL?

Quote:
Originally posted by David Gatti
If I have a 10" woofer capable of 94dB at 25Hz (within Xmax), then adding a 2nd woofer (the other channel) will allow 100dB. If I then estimate 10dB boost due to boundary reinforcement, then I can expect roughly 110dB levels at 25Hz. My point is that 2 x 10" woofers (a stereo pair) should produce ample volume for a typical listening room.
Rather than going to subwoofers which are always a compromise with location and integration to satellites, I think a 3 way system with a 10" woofer is the best solution. Any thoughts?

by using a stereo pair, you will only get 3dB increase with the second woofer.
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Old 13th January 2005, 03:25 AM   #4
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Are you sure? I thought it was a 6dB increase when you wire 2 woofers in parallel, thereby doubling cone area Sd.
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Old 13th January 2005, 03:32 AM   #5
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I had a vented 10" per channel and wasn't happy even though my listening room is only 15' x 18'. I switched to 2 sealed 12's per channel and now live in 7th
heaven. Sure, the enclosures are much larger but the cost was insignificant.
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Old 13th January 2005, 03:38 AM   #6
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Bill

What are the 12s? How big is the box, and please describe 7th heaven for us?

Mos
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Old 13th January 2005, 03:45 AM   #7
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Quote:
Originally posted by David Gatti
Are you sure? I thought it was a 6dB increase when you wire 2 woofers in parallel, thereby doubling cone area Sd.
You get a 6db increase in sensitivity, yes- but only a 3 db increase in efficiency. Two woofers in parallel halves the impedance, and since most amplifiers act like voltage sources, they lower impedance draws more current. You get 3db from doubling power, and 3db from doubling cone area. At least- that's how I understand it- a 6db total increase.

One thing to consider is- what is ample volume? Home theater (and occasional house parties) were the reason my 10's weren't quite enough.
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Old 13th January 2005, 03:49 AM   #8
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2 10s in a two way system is like my advents. then i stacked them: 4-10s. them i added another pair for centter channel use: 6-10s. great for music, still need a sub for HT.

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Old 13th January 2005, 03:50 AM   #9
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I'm not talking efficiency or sensitivity. I'm talking maximum SPL that can be achieved as a function of Sd and Xmax. As I understand it, doubling Sd (from 1x10" woofer to either 2x10" or 1x15") increases the maximum linear SPL by 6dB. Correct me if I'm wrong.
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Old 13th January 2005, 03:56 AM   #10
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Sprucemouse - are you saying that all your 10 inchers are reaching their full excursion limits?
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