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Re: 7Pi Build 2014 [message #80626 is a reply to message #80622]

Sun, 05 October 2014 08:51

Wayne Parham
Messages: 18786
Registered: January 2001

Illuminati (33rd Degree)

If the measurements are right, it looks to me like there are at least three things happening.

First is the midrange doesn't look attenuated to match the other drivers. So I would look at the R4/R5 resistors. Make sure they're installed correctly and not shorted. That's a kind of easy problem to solve because it's just attenuation.

Second, the 300Hz peak. Something is going on there, probably a panel resonance. You might want to damp panels one at a time with a pillow or your hand and see if you can identify the cause. That one could be a measuring artifact too, so move the speakers and microphone and measure again. Best to measure outside. But I suspect that one is a panel resonance.

Third, the lack of treble, and the overall downward sloping trend. I see that a lot with measurement problems. Sometimes I see it with microphones overdriving the input amplifier. One would think the extra harmonics would artificially show excess HF, but I often see that problem cause a downward slope. Or it could be something else in the measurement system. But this could be confirmed by measuring something else and seeing if the downward trend existed there too. If it's truly the speakers, then the tweeter circuit or compression driver is off.

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[Message index]

		7Pi Build 2014 By: compaddict on Fri, 20 June 2014 17:54
		Re: 7Pi Build 2014 By: compaddict on Fri, 20 June 2014 17:55
		Re: 7Pi Build 2014 By: compaddict on Fri, 20 June 2014 17:56
		Re: 7Pi Build 2014 By: compaddict on Fri, 20 June 2014 23:13
		Re: 7Pi Build 2014 By: compaddict on Tue, 24 June 2014 14:46
		Re: 7Pi Build 2014 By: Wayne Parham on Tue, 24 June 2014 15:46
		Re: 7Pi Build 2014 By: compaddict on Thu, 24 July 2014 15:25
		Re: 7Pi Build 2014 By: petew on Thu, 24 July 2014 19:51
		Re: 7Pi Build 2014 By: compaddict on Fri, 25 July 2014 13:47
		Re: 7Pi Build 2014 By: compaddict on Fri, 01 August 2014 15:56
		Re: 7Pi Build 2014 By: compaddict on Sat, 09 August 2014 22:10
		Re: 7Pi Build 2014 By: compaddict on Sun, 10 August 2014 16:36
		Re: 7Pi Build 2014 By: Wayne Parham on Mon, 11 August 2014 08:02
		Re: 7Pi Build 2014 By: compaddict on Tue, 26 August 2014 18:20
		Re: 7Pi Build 2014 By: compaddict on Fri, 29 August 2014 17:27
		Re: 7Pi Build 2014 By: Wayne Parham on Fri, 29 August 2014 19:54
		Re: 7Pi Build 2014 By: compaddict on Mon, 01 September 2014 14:01
		Re: 7Pi Build 2014 By: compaddict on Mon, 01 September 2014 21:44
		Re: 7Pi Build 2014 By: Wayne Parham on Tue, 02 September 2014 00:00
		Re: 7Pi Build 2014 By: compaddict on Fri, 05 September 2014 17:56
		Re: 7Pi Build 2014 By: blvdre on Sat, 06 September 2014 06:30
		Re: 7Pi Build 2014 By: petew on Sat, 06 September 2014 11:14
		Re: 7Pi Build 2014 By: compaddict on Sat, 06 September 2014 15:12
		Re: 7Pi Build 2014 By: compaddict on Sun, 07 September 2014 15:39
		Re: 7Pi Build 2014 By: Wayne Parham on Mon, 08 September 2014 10:22
		Re: 7Pi Build 2014 By: compaddict on Mon, 08 September 2014 19:21
		Re: 7Pi Build 2014 By: compaddict on Tue, 09 September 2014 23:19
		Re: 7Pi Build 2014 By: Wayne Parham on Wed, 10 September 2014 15:31
		Re: 7Pi Build 2014 By: compaddict on Thu, 11 September 2014 17:23
		Re: 7Pi Build 2014 By: compaddict on Fri, 12 September 2014 09:59
		Re: 7Pi Build 2014 By: rkeman on Fri, 12 September 2014 15:02
		Re: 7Pi Build 2014 By: compaddict on Fri, 12 September 2014 15:10
		Re: 7Pi Build 2014 By: compaddict on Fri, 12 September 2014 17:11
		Re: 7Pi Build 2014 By: compaddict on Sat, 13 September 2014 12:52
		Re: 7Pi Build 2014 By: my0x on Sat, 13 September 2014 19:34
		Re: 7Pi Build 2014 By: tubemax on Sun, 14 September 2014 04:03
		Re: 7Pi Build 2014 By: tubemax on Sun, 14 September 2014 04:42
		Re: 7Pi Build 2014 By: tubemax on Sun, 14 September 2014 05:27
		Re: 7Pi Build 2014 By: Wayne Parham on Sun, 14 September 2014 10:38
		Re: 7Pi Build 2014 By: compaddict on Sun, 14 September 2014 11:15
		Re: 7Pi Build 2014 By: Wayne Parham on Sun, 14 September 2014 19:16
		Re: 7Pi Build 2014 By: compaddict on Sun, 14 September 2014 19:22
		Re: 7Pi Build 2014 By: compaddict on Sun, 14 September 2014 21:30
		Re: 7Pi Build 2014 By: Wayne Parham on Sun, 14 September 2014 22:20
		Re: 7Pi Build 2014 By: compaddict on Sun, 14 September 2014 23:43
		Re: 7Pi Build 2014 By: Wayne Parham on Mon, 15 September 2014 08:10
		Re: 7Pi Build 2014 By: compaddict on Mon, 15 September 2014 10:54
		Re: 7Pi Build 2014 By: Wayne Parham on Mon, 15 September 2014 12:02
		Re: 7Pi Build 2014 By: compaddict on Mon, 15 September 2014 12:29
		Re: 7Pi Build 2014 By: Wayne Parham on Mon, 15 September 2014 16:23
		Re: 7Pi Build 2014 By: compaddict on Wed, 17 September 2014 00:06
		Re: 7Pi Build 2014 By: Wayne Parham on Wed, 17 September 2014 07:14
		Re: 7Pi Build 2014 By: compaddict on Wed, 17 September 2014 08:32
		Re: 7Pi Build 2014 By: Wayne Parham on Wed, 17 September 2014 10:23
		Re: 7Pi Build 2014 By: compaddict on Wed, 17 September 2014 10:44
		Re: 7Pi Build 2014 By: tom-m on Wed, 17 September 2014 14:45
		Re: 7Pi Build 2014 By: Wayne Parham on Wed, 17 September 2014 16:12
		Re: 7Pi Build 2014 By: compaddict on Sun, 28 September 2014 11:37
		Re: 7Pi Build 2014 By: rkeman on Sun, 28 September 2014 12:11
		Re: 7Pi Build 2014 By: compaddict on Sat, 04 October 2014 10:22
		Re: 7Pi Build 2014 By: skywave-rider on Sat, 04 October 2014 13:52
		Re: 7Pi Build 2014 By: compaddict on Sat, 04 October 2014 14:15
		Re: 7Pi Build 2014 By: Wayne Parham on Sun, 05 October 2014 08:51
		Re: 7Pi Build 2014 By: compaddict on Sun, 05 October 2014 10:53
		Re: 7Pi Build 2014 By: compaddict on Sun, 05 October 2014 16:52
		Re: 7Pi Build 2014 By: Wayne Parham on Mon, 06 October 2014 08:37
		Re: 7Pi Build 2014 By: compaddict on Mon, 06 October 2014 12:12
		Re: 7Pi Build 2014 By: Wayne Parham on Mon, 06 October 2014 14:00
		Re: 7Pi Build 2014 By: JCDC on Mon, 06 October 2014 14:01
		Re: 7Pi Build 2014 By: Wayne Parham on Mon, 06 October 2014 14:09
		Re: 7Pi Build 2014 By: Wayne Parham on Mon, 06 October 2014 14:30
		Re: 7Pi Build 2014 By: my0x on Mon, 06 October 2014 14:46
		Re: 7Pi Build 2014 By: Wayne Parham on Mon, 06 October 2014 14:47
		Re: 7Pi Build 2014 By: compaddict on Mon, 06 October 2014 14:54
		Re: 7Pi Build 2014 By: Wayne Parham on Mon, 06 October 2014 15:00
		Re: 7Pi Build 2014 By: compaddict on Mon, 06 October 2014 15:13
		Re: 7Pi Build 2014 By: Wayne Parham on Mon, 06 October 2014 15:24
		Re: 7Pi Build 2014 By: compaddict on Mon, 06 October 2014 15:38
		Re: 7Pi Build 2014 By: Wayne Parham on Mon, 06 October 2014 16:17
		Re: 7Pi Build 2014 By: compaddict on Mon, 06 October 2014 16:32
		Re: 7Pi Build 2014 By: Wayne Parham on Tue, 07 October 2014 08:18
		Re: 7Pi Build 2014 By: compaddict on Tue, 07 October 2014 12:21
		Re: 7Pi Build 2014 By: Wayne Parham on Tue, 07 October 2014 14:08
		Re: 7Pi Build 2014 By: compaddict on Thu, 09 October 2014 19:09
		Re: 7Pi Build 2014 By: compaddict on Thu, 16 October 2014 14:53
		Re: 7Pi Build 2014 By: Wayne Parham on Thu, 16 October 2014 16:21
		Re: 7Pi Build 2014 By: compaddict on Sun, 19 October 2014 18:14
		Re: 7Pi Build 2014 By: Wayne Parham on Mon, 20 October 2014 09:28
		Re: 7Pi Build 2014 By: Nelson Bass on Tue, 21 October 2014 01:04
		Re: 7Pi Build 2014 By: Wayne Parham on Tue, 21 October 2014 07:50
		Re: 7Pi Build 2014 By: compaddict on Wed, 05 November 2014 10:42
		Re: 7Pi Build 2014 By: Wayne Parham on Sat, 08 November 2014 10:07
		Re: 7Pi Build 2014 By: Nelson Bass on Wed, 12 November 2014 15:57
		Re: 7Pi Build 2014 By: compaddict on Wed, 12 November 2014 16:07
		Re: 7Pi Build 2014 By: blvdre on Sat, 15 November 2014 14:25
		Re: 7Pi Build 2014 By: compaddict on Sun, 16 November 2014 14:50
		Re: 7Pi Build 2014 By: compaddict on Thu, 20 November 2014 23:45
		Re: 7Pi Build 2014 By: compaddict on Mon, 01 December 2014 12:35
		Re: 7Pi Build 2014 By: Wayne Parham on Mon, 01 December 2014 13:54
		Re: 7Pi Build 2014 By: compaddict on Fri, 10 June 2016 13:30
		Re: 7Pi Build 2014 By: Wayne Parham on Fri, 10 June 2016 17:19
		Re: 7Pi Build 2014 By: compaddict on Sat, 08 December 2018 10:22
		Re: 7Pi Build 2014 By: Wayne Parham on Sun, 09 December 2018 10:28

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