2 x 10" woofers - enough low freq SPL?

David Gatti · 13th January 2005, 01:31 AM

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?

simon5 · 13th January 2005, 01:58 AM

If you want only 25 Hz, then it's a good solution for you. 110 dB is enough.

AudioFreak · 13th January 2005, 02:18 AM

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.

David Gatti · 13th January 2005, 02:25 AM

Are you sure? I thought it was a 6dB increase when you wire 2 woofers in parallel, thereby doubling cone area Sd.

Bill Fitzpatrick · 13th January 2005, 02:32 AM

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.

Mos Fetish · 13th January 2005, 02:38 AM

Bill

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

Mos

joe carrow · 13th January 2005, 02:45 AM

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.

sprucemoose · 13th January 2005, 02:49 AM

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.

sm.

David Gatti · 13th January 2005, 02:50 AM

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.

David Gatti · 13th January 2005, 02:56 AM

Sprucemouse - are you saying that all your 10 inchers are reaching their full excursion limits?

13th January 2005, 01:31 AM	#1
David Gatti diyAudio Member Join Date: Mar 2004 Location: Melbourne, Australia	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?

13th January 2005, 01:58 AM	#2
simon5 diyAudio Member Join Date: Nov 2004 Location: Québec, Québec	If you want only 25 Hz, then it's a good solution for you. 110 dB is enough. __________________ DIYaudio for President !

13th January 2005, 02:49 AM	#8
sprucemoose diyAudio Member Join Date: Mar 2004 Location: Williamsburg, VA	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. sm. __________________ Kenwood VR6070, Panasonic 53wx53, 3 sets of double advents across the front, dual 1245, MA282e.

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13th January 2005, 02:25 AM	#4
David Gatti diyAudio Member Join Date: Mar 2004 Location: Melbourne, Australia	Are you sure? I thought it was a 6dB increase when you wire 2 woofers in parallel, thereby doubling cone area Sd.

13th January 2005, 02:32 AM	#5
Bill Fitzpatrick diyAudio Member Join Date: Jun 2001 Location: Eugene, OR	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.

13th January 2005, 02:38 AM	#6
Mos Fetish diyAudio Member Join Date: Feb 2003 Location: New Zealand	Bill What are the 12s? How big is the box, and please describe 7th heaven for us? Mos

13th January 2005, 02:50 AM	#9
David Gatti diyAudio Member Join Date: Mar 2004 Location: Melbourne, Australia	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.

13th January 2005, 02:56 AM	#10
David Gatti diyAudio Member Join Date: Mar 2004 Location: Melbourne, Australia	Sprucemouse - are you saying that all your 10 inchers are reaching their full excursion limits?

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