In Reply to: To be fair ... posted by Paul Joppa on February 5, 2007 at 14:27:13:
"the notch at 160Hz seems most likely to be an underdamped column resonance"About the only way you can get a notch like that is via an out of phase reflection. I've seen it claimed that the problem was caused by a ground reflection to the mic, but that doesn't wash if the measurement was done in an anechoic chamber. The impedance chart is classic bass reflex with a 50Hz fb, it doesn't even resemble an underdamped TL, let alone a stuffed TL, which has a single peak at fp. A quarter-wavelength driver to internal boundary reflection is most likely, being a tower I guess there could be a 1.7 foot internal path that wasn't rendered non-reflective. If they did fix it I've never seen a new measurement.
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Follow Ups
- Re: To be fair ... - Bill Fitzmaurice 15:32:54 02/05/07 (9)
- Re: To be fair ... - Duke 17:52:05 02/05/07 (7)
- Re: To be fair ... - Bill Fitzmaurice 20:43:09 02/05/07 (6)
- NY sub shoot out? - Kloss 06:24:26 02/06/07 (4)
- Re: NY sub shoot out? - Bill Fitzmaurice 06:38:56 02/06/07 (3)
- Re: NY sub shoot out? - JeffreyJ 11:27:02 02/06/07 (2)
- Re: NY sub shoot out? - Bill Fitzmaurice 14:39:02 02/06/07 (1)
- thanks...... nt - JeffreyJ 21:51:25 02/06/07 (0)
- Hmmmm.... you're right... - Duke 21:05:56 02/05/07 (0)
- Re: To be fair ... - V 15:50:12 02/05/07 (0)