Group Delay

Posted on August 6, 2014 at 16:40:11

jcmusic
Audiophile

Posts: 1387
Location: New Orleans, La.
Joined: June 13, 2006

Which group delay looks best and why? Please explain a little...

tomservo

18:46:07 08/07/14

Paul Joppa

18:34:31 08/07/14

Bill Fitzmaurice

18:58:53 08/06/14

...

tomservo

18:46:07 08/07/14

Paul Joppa

18:34:31 08/07/14

Bill Fitzmaurice

18:58:53 08/06/14

jcmusic

19:44:56 08/06/14

Bill Fitzmaurice

05:27:31 08/07/14

jcmusic

09:46:59 08/07/14

RE: Group Delay, posted on August 6, 2014 at 18:58:53
Bill Fitzmaurice Industry Professional Posts: 5370 Location: New England Joined: October 20, 2002	Those don't look like group delay charts.

RE: Group Delay, posted on August 6, 2014 at 19:44:56
jcmusic Audiophile Posts: 1387 Location: New Orleans, La. Joined: June 13, 2006	What do they look like?

RE: Group Delay, posted on August 7, 2014 at 05:27:31
Bill Fitzmaurice Industry Professional Posts: 5370 Location: New England Joined: October 20, 2002	This is a typical subwoofer group delay chart.

RE: Group Delay, posted on August 7, 2014 at 09:46:59
jcmusic Audiophile Posts: 1387 Location: New Orleans, La. Joined: June 13, 2006	Ah there's the problem my graph is full range not just the sub

RE: Group Delay, posted on August 7, 2014 at 18:34:31
Paul Joppa Industry Professional Posts: 7295 Location: Seattle, WA Joined: April 23, 2001	Because of the large scale (100mS is like 113 feet of sound wave travel), I would guess this is a calculation from an in-room measurement, and dominated by the room's reverberation rather than the direct sound.

RE: Group Delay, posted on August 7, 2014 at 18:46:07
tomservo Manufacturer Posts: 8191 Joined: July 4, 2002	Hi There is something funny about those curves. Sound travels at the rate of about .883 ms per foot and so the curve suggests the 200 hz range is about 40-50ms behind the hf section which is much larger than the delay a normal crossover would produce. What kind of speakers are these and how were they measured? Best, Tom

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