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Old 9th August 2012, 10:08 PM   #1
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Default Weird frequency response measurements.

Hi.
Please, take take a look at these screenshots of ARC.

Can someone explain me that weird rise in high frequency on the HS80's?
I got them modded but they sound great to me... Could that be an indication of the NE5532's in oscillation? (they came with NJM4558's)

I took these measurements today, same room. I got both pairs of speakers working. (not at the same time )

HS80:

Click the image to open in full size.




Mission 763 (floorstanders):
Click the image to open in full size.



PS: I took the measurements with my diy mic based on the panasonic wm60 capsule with the linkwitz mod.

thanks.
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Old 9th August 2012, 10:18 PM   #2
tvrgeek is offline tvrgeek  United States
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What do you hear?
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Old 9th August 2012, 10:20 PM   #3
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It looks to be the speakers (are they active), as the second measurement seems fine. I doubt that it is oscillation, as it is s steady rise from about 3K up to 20K of nearly 12db!! Oscillation (in the audio range) I would think would show up as hash or a spike at a particular frequency.

How does it sound after the correction is applied? It certainly looks like there is some sort of boost happening in the raw measurement as I really can't see how the tweeter would be 12db more efficient at 20K that and 3K with a pretty constant slope from start to finish.

Tony.
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Old 9th August 2012, 10:24 PM   #4
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I know that hs80 are bright speakers but this seems ridiculous.
i really don't hear nothing abnormal besides yamaha's natural brightnes that it always had since day one.

If i apply the correction they sound completely muffled, cymbals almost disappear. Strange no?
I don't really use arc to correct the room. i'm trying to address that problem with the "do-some-acoustic-panels" way.

Last edited by joaoveludo; 9th August 2012 at 10:33 PM.
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Old 9th August 2012, 10:37 PM   #5
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HS80's are placed higher in stands, at my head and the measurement mic's height.
Mission tweeters are about 40cm lower.
Does that help?
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Old 10th August 2012, 03:31 AM   #6
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ok that changes things (a bit) . You should do a measurement of the Missions on axis with the tweeter. If possible take measurements of the HS80's with the mic in the same spot and the speaker in the same spot as the mission.

What was your measurement distance?

Tony.
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Old 10th August 2012, 05:47 AM   #7
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Could be a problem with ARC. Is this the new version with XT32?
I'd get a "second opinion" with REW or Holm.
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