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Old 23rd October 2012, 09:31 AM   #561
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I haven't had time to read the entire thread, but correct me if I'm wrong. Dipoles can't pressurise a room like a monopole subwoofer can.

Dipoles have an 18 dB total drop per octave once wavelengths surpass baffle size? I was having an argument with a guy who claims his big ESL's can wipe the floor with monopole subs and how the roll off is not as steep as monopole subs. I don't understand that. I assumed dipolar operation meant there would be more cancellation, hence a more steep roll-off.
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Old 23rd October 2012, 09:41 AM   #562
Omholt is offline Omholt  Norway
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All sound pressurizes the room.
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Old 23rd October 2012, 09:52 AM   #563
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Please explain. So monopoles and dipoles both pressurise the room? By the same amount?
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Old 23rd October 2012, 09:59 AM   #564
Rudolf is offline Rudolf  Germany
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Quote:
Originally Posted by Vaughan View Post
Dipoles have an 18 dB total drop per octave once wavelengths surpass baffle size?
It is 6 dB/oct below "once wavelengths surpass baffle size". Add to that 12 dB/oct below the Fs of the driver. You always want Fs to be some octaves below the onset of the 6 dB rolloff.
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Old 23rd October 2012, 10:09 AM   #565
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Any knowledge of Acoustats? How would you calculate the drop in SPL with this :

Acoustat 2+2 loudspeaker Specifications | Stereophile.com
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Old 23rd October 2012, 10:11 AM   #566
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Quote:
Originally Posted by Rudolf
It is 6 dB/oct below "once wavelengths surpass baffle size". Add to that 12 dB/oct below the Fs of the driver. You always want Fs to be some octaves below the onset of the 6 dB rolloff.
So compared to a monopole sub, the roll-off (in a room) is more shallow/steep?
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Old 23rd October 2012, 10:12 AM   #567
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Does anyone know what the typical excursion levels are like in most ESLs? 2mm p-p? 5mm? Far less, more?
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Old 23rd October 2012, 10:32 AM   #568
Rudolf is offline Rudolf  Germany
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Quote:
Originally Posted by Vaughan View Post
So compared to a monopole sub, the roll-off (in a room) is more shallow/steep?
Above Fs the dipole roll-off is steeper. Below Fs it could be shallower, if the monopole sub is of the BR or bandpass type.
Why don`t you just read the thread?
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Old 23rd October 2012, 10:39 AM   #569
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I read some of John's articles and I won't lie, I don't understand much of it. But he mentioned dipoles not benefiting from room mode pressurisation, if I understand him correctly. Monopole/dipoles don't excite room modes in the same way.

I would love to read the thread but 57 pages? I have long way to go then.
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Old 23rd October 2012, 10:49 AM   #570
Rudolf is offline Rudolf  Germany
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Quote:
Originally Posted by Vaughan View Post
But he mentioned dipoles not benefiting from room mode pressurisation, if I understand him correctly.
And Earl Geddes says that there is no pressure gain for monopoles also.
But the guy I would trust the least is the one who claims to be an expert in "wiping the floor with ..." .

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