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High Efficiency Speaker Asylum Need speakers that can rock with just one watt? You found da place. |
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In Reply to: Giant Horn Speakers and Time Alignment .... posted by cids on March 6, 2012 at 16:11:27:
In my own system, which was all an experiment, I was trying to get coherent wide range without any digital time correction since the system was intended for analog playback.
Based on some very old test data Dr. Edgar showed me of human sensitivity to time delay at varying frequencies I made sure that differences between bass/midbass and midbass/midrange fell within the imperceptible range. The tweeter and mid are physically aligned with a first order crossover.
In order to do this the bass horns were designed with the mouths flaring to compensate for the volume of the 3-way main arrays to sit in their mouths. There is ~8ms difference between the bass drivers and the midbass drivers. According to the test data this is not perceptible at 65Hz, which is the crossover point.
I forgot the exact difference at the midbass/mid point, but I got it within the tolerances needed. The human ear is most critical of time differences in the midrange and can detect less variation at either ende of the audible spectrum: it graphs to a bell-shaped curve.
It isn't pretty, but those who have heard my system are generally impressed with it's imaging and detail. In addition to considering these things before building I got really lucky too. I had always intended to rebuild it to look better... funny how having kids puts some projects on the back burner.
eso
They were a carnival of American decay on parade, and they had no idea of the atrocity they had inflicted upon themselves." Henry Chinaski
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Follow Ups
- Regardless of what it looks like anyone who is serious addresses time alignment in some manner. - eso 08:19:34 03/10/12 (5)
- RE: Regardless of what it looks like anyone who is serious addresses time alignment in some manner. - Dan_ed 04:45:14 03/14/12 (0)
- RE: Regardless of what it looks like anyone who is serious addresses time alignment in some manner. - b.l.zeebub 09:18:02 03/11/12 (2)
- RE: Regardless of what it looks like anyone who is serious addresses time alignment in some manner. - tomservo 10:01:00 03/11/12 (1)
- RE: Regardless of what it looks like anyone who is serious addresses time alignment in some manner. - b.l.zeebub 03:10:12 03/13/12 (0)
- Congratulation ! - cids 08:34:46 03/10/12 (0)
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