Measured monopole and dipole room responses - Page 57 - diyAudio
 Measured monopole and dipole room responses
 User Name Stay logged in? Password
 Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read Search

 Multi-Way Conventional loudspeakers with crossovers

 Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
 23rd October 2012, 09:31 AM #561 diyAudio Member   Join Date: Jan 2004 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.
 23rd October 2012, 09:41 AM #562 diyAudio Member     Join Date: Jun 2009 All sound pressurizes the room.
 23rd October 2012, 09:52 AM #563 diyAudio Member   Join Date: Jan 2004 Please explain. So monopoles and dipoles both pressurise the room? By the same amount?
diyAudio Member

Join Date: Mar 2003
Location: Germany
Quote:
 Originally Posted by Vaughan 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.
__________________
www.dipolplus.de

 23rd October 2012, 10:09 AM #565 diyAudio Member   Join Date: Jan 2004 Any knowledge of Acoustats? How would you calculate the drop in SPL with this : Acoustat 2+2 loudspeaker Specifications | Stereophile.com
diyAudio Member

Join Date: Jan 2004
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?

 23rd October 2012, 10:12 AM #567 diyAudio Member   Join Date: Jan 2004 Does anyone know what the typical excursion levels are like in most ESLs? 2mm p-p? 5mm? Far less, more?
diyAudio Member

Join Date: Mar 2003
Location: Germany
Quote:
 Originally Posted by Vaughan 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.
__________________
www.dipolplus.de

 23rd October 2012, 10:39 AM #569 diyAudio Member   Join Date: Jan 2004 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.
diyAudio Member

Join Date: Mar 2003
Location: Germany
Quote:
 Originally Posted by Vaughan 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 ..." .

Rudolf
__________________
www.dipolplus.de

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OffTrackbacks are Off Pingbacks are Off Refbacks are Off Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post Hara Subwoofers 19 3rd January 2016 10:00 PM terry j Multi-Way 25 1st July 2007 03:28 AM Jussi Multi-Way 11 4th May 2006 03:38 PM gavinson Multi-Way 0 29th November 2005 12:07 AM GuyPanico Multi-Way 4 12th November 2005 02:49 PM

 New To Site? Need Help?

All times are GMT. The time now is 11:38 AM.