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Re: 4 pi speakers + 3 pi subwoofers, pics & measurements [message #81354 is a reply to message #81352]

Tue, 26 May 2015 13:39

Wayne Parham
Messages: 18689
Registered: January 2001

Illuminati (33rd Degree)

Those measurements look good for the most part. But I agree with you that something is wrong above 8kHz.

To isolate the cause, try putting the microphone right in the tweeter throat and see what the response looks like. If the response above 8kHz doesn't look like what's in our published spec sheets, then something is wrong with the compression driver, crossover or measurement gear.

Normally I'd say look at the crossover first. And I suppose it wouldn't hurt to isolate it by removing the crossover. Measure the compression driver, all by itself, with just a series capacitor for protection. But honestly, if we had a crossover problem, I'd expect the response to be bad starting a couple octaves below that. This kind of rolloff looks more like a problem with the driver or the microphone.

In any case, you'll have to do a process of elimination to find the culprit.

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[Message index]

		4 pi speakers + 3 pi subwoofers, pics & measurements By: vandevoordekoen on Tue, 26 May 2015 13:29
		Re: 4 pi speakers + 3 pi subwoofers, pics & measurements By: Wayne Parham on Tue, 26 May 2015 13:39
		Re: 4 pi speakers + 3 pi subwoofers, pics & measurements By: vandevoordekoen on Wed, 27 May 2015 08:05
		Re: 4 pi speakers + 3 pi subwoofers, pics & measurements By: Wayne Parham on Wed, 27 May 2015 11:04
		Re: 4 pi speakers + 3 pi subwoofers, pics & measurements By: vandevoordekoen on Wed, 27 May 2015 16:23
		Re: 4 pi speakers + 3 pi subwoofers, pics & measurements By: Wayne Parham on Thu, 28 May 2015 11:19
		Re: 4 pi speakers + 3 pi subwoofers, pics & measurements By: chrisR on Thu, 28 May 2015 11:32
		Re: 4 pi speakers + 3 pi subwoofers, pics & measurements By: vandevoordekoen on Thu, 28 May 2015 12:59
		Re: 4 pi speakers + 3 pi subwoofers, pics & measurements By: Wayne Parham on Thu, 28 May 2015 14:36
		Re: 4 pi speakers + 3 pi subwoofers, pics & measurements By: vandevoordekoen on Sat, 30 May 2015 11:28
		Re: 4 pi speakers + 3 pi subwoofers, pics & measurements By: Wayne Parham on Sun, 31 May 2015 09:48
		Re: 4 pi speakers + 3 pi subwoofers, pics & measurements By: tom-m on Wed, 03 June 2015 18:12
		Re: 4 pi speakers + 3 pi subwoofers, pics & measurements By: Wayne Parham on Thu, 04 June 2015 10:19
		Re: 4 pi speakers + 3 pi subwoofers, pics & measurements By: vandevoordekoen on Thu, 04 June 2015 10:53
		Re: 4 pi speakers + 3 pi subwoofers, pics & measurements By: Wayne Parham on Fri, 05 June 2015 17:37
		Re: 4 pi speakers + 3 pi subwoofers, pics & measurements By: vandevoordekoen on Tue, 26 May 2015 13:47
		Re: 4 pi speakers + 3 pi subwoofers, pics & measurements By: tom-m on Fri, 05 June 2015 22:09

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