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Re: 4 Pi Build Progress [message #81596 is a reply to message #81595]

Wed, 23 September 2015 17:57

Wayne Parham
Messages: 18675
Registered: January 2001

Illuminati (33rd Degree)

I'm suspicious of the measurement system. If you had a driver mis-wired, you'd see a hole around 1.2kHz. So it's not that.

I see a big hole around 5kHz, and it's pretty much the same in both traces. However, if that were a compression driver problem, I'd expect it to be in one but not the other. So I doubt it's the driver.

It looks like one measurement trace one is shifted in frequency with respect to the other by about 10%. Where one shows a feature at say 5kHz, the other shows the same feature at 5.5kHz. Where one shows something at 42Hz, the other shows the same thing at 47Hz. So the anomalies appear to be the same in both traces, but for some reason, they're shifted in frequency by 10%. That's an odd set of symptoms.

I think the anomalies are probably caused by the measurement system. It's the only thing I can see that would cause this.

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[Message index]

		4 Pi Build Progress By: BobTahoe on Sat, 18 July 2015 23:04
		Re: 4 Pi Build Progress By: Wayne Parham on Sun, 19 July 2015 12:13
		Re: 4 Pi Build Progress By: BobTahoe on Mon, 20 July 2015 12:10
		Re: 4 Pi Build Progress By: BobTahoe on Tue, 21 July 2015 12:18
		Re: 4 Pi Build Progress By: BobTahoe on Tue, 21 July 2015 16:28
		Re: 4 Pi Build Progress By: steve f on Wed, 22 July 2015 02:30
		Re: 4 Pi Build Progress By: BobTahoe on Wed, 22 July 2015 09:30
		Re: 4 Pi Build Progress By: BobTahoe on Thu, 23 July 2015 11:55
		Re: 4 Pi Build Progress By: Wayne Parham on Thu, 23 July 2015 14:34
		Re: 4 Pi Build Progress By: BobTahoe on Thu, 23 July 2015 15:19
		Re: 4 Pi Build Progress By: Wayne Parham on Thu, 23 July 2015 15:39
		Re: 4 Pi Build Progress By: BobTahoe on Thu, 23 July 2015 15:56
		Re: 4 Pi Build Progress By: BobTahoe on Fri, 24 July 2015 11:49
		Re: 4 Pi Build Progress By: Wayne Parham on Fri, 24 July 2015 12:39
		Re: 4 Pi Build Progress By: BobTahoe on Sun, 26 July 2015 00:11
		Re: 4 Pi Build Progress By: johnnycamp5 on Sun, 26 July 2015 08:32
		Re: 4 Pi Build Progress By: BobTahoe on Sun, 26 July 2015 09:43
		Re: 4 Pi Build Progress By: BobTahoe on Sun, 26 July 2015 20:25
		Re: 4 Pi Build Progress By: johnnycamp5 on Mon, 27 July 2015 07:11
		Re: 4 Pi Build Progress By: johnnycamp5 on Mon, 27 July 2015 07:22
		Re: 4 Pi Build Progress By: BobTahoe on Mon, 27 July 2015 22:15
		Re: 4 Pi Build Progress By: BobTahoe on Tue, 28 July 2015 20:16
		Re: 4 Pi Build Progress By: Wayne Parham on Wed, 29 July 2015 14:46
		Re: 4 Pi Build Progress By: johnnycamp5 on Wed, 29 July 2015 17:27
		Re: 4 Pi Build Progress By: johnnycamp5 on Fri, 31 July 2015 06:31
		Re: 4 Pi Build Progress By: BobTahoe on Fri, 31 July 2015 09:39
		Re: 4 Pi Build Progress By: BobTahoe on Sat, 01 August 2015 15:06
		Re: 4 Pi Build Progress By: BobTahoe on Sun, 02 August 2015 23:33
		Re: 4 Pi Build Progress By: Wayne Parham on Mon, 03 August 2015 14:50
		Re: 4 Pi Build Progress By: BobTahoe on Thu, 06 August 2015 16:50
		Re: 4 Pi Build Progress By: BobTahoe on Fri, 07 August 2015 21:26
		Re: 4 Pi Build Progress By: Wayne Parham on Sat, 08 August 2015 08:23
		Re: 4 Pi Build Progress By: BobTahoe on Tue, 01 September 2015 09:44
		Re: 4 Pi Build Progress By: Wayne Parham on Tue, 01 September 2015 23:00
		Re: 4 Pi Build Progress By: BobTahoe on Fri, 04 September 2015 11:43
		Re: 4 Pi Build Progress By: Wayne Parham on Fri, 04 September 2015 15:17
		Re: 4 Pi Build Progress By: BobTahoe on Sat, 12 September 2015 20:05
		Re: 4 Pi Build Progress By: rvsixer on Sat, 12 September 2015 22:55
		Re: 4 Pi Build Progress By: Wayne Parham on Mon, 14 September 2015 11:27
		Re: 4 Pi Build Progress By: BobTahoe on Mon, 21 September 2015 10:08
		Re: 4 Pi Build Progress By: rvsixer on Mon, 21 September 2015 10:23
		Re: 4 Pi Build Progress By: BobTahoe on Mon, 21 September 2015 10:59
		Re: 4 Pi Build Progress By: rvsixer on Tue, 22 September 2015 08:37
		Re: 4 Pi Build Progress By: BobTahoe on Wed, 23 September 2015 15:37
		Re: 4 Pi Build Progress By: BobTahoe on Wed, 23 September 2015 15:56
		Re: 4 Pi Build Progress By: Wayne Parham on Wed, 23 September 2015 17:57
		Re: 4 Pi Build Progress By: skywave-rider on Sat, 26 September 2015 08:39
		Re: 4 Pi Build Progress By: BobTahoe on Tue, 29 September 2015 15:30

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