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In Reply to: RE: Magnepan 3.5 low end dropofft and some high end harmonics/dropoff posted by Davey on November 24, 2015 at 08:21:19
Crossovers and audessey were disabled during the measurements. Just using that as a statement to show multiple measurements seem to point in the same direction (low bass output)
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If the transducers are good....wires not separating....no buzzing....etc, etc, there's no method by which the bass response should fall off unexpectedly.
If you think it might be a possible issue with the external crossover then I would suggest eliminating it (temporarily) and driving the woofer panels directly. The external crossover is a low-pass filter only and shouldn't change the bottom end response if eliminated.
Also, it doesn't make sense that an issue/problem would present itself on both speakers at the same time. This still leads me to believe your issue is measurement related and not a problem with the speakers.Cheers,
Dave.
Edits: 11/24/15 11/24/15
Yeah, I would agree it is strange. I was thinking maybe age (either mylar or components), but others don't seem to have similar issues and I would expect each speaker to show up differently.
Measurement setup:: ECM8000 spaced equidistant from both speakers, facing upwards and using an usb preamp. It was placed in a stand at my seating position, no adjustment between tests.
I could try to measure closer to each speaker to try to take the room out of the equation. Just seems funny if this room does the same to the bottom end for these units as my old house.
As for the equipment, I'm sure it works and reports lower signals. I've checked with my other speakers (two pairs of NFR, an 8-1-30 and a 645, plus my sub) and they all show proper output at my seating position. I just still greatly prefer the total sound from the mg3.5s, even with the issues.
I noticed the scan is at a somewhat low amplitude (60 db). I assume you calibrated the built-in SPL meter before starting. I usually run my scans at 80db (matching to an old RS analytic SPL meter, C weighted). I don't know if this is the problem but I would try another scan 10 or 20db louder if you don't have a meter for calibration, or 80db, if you can calibrate, and assuming you have the headroom - the sound will be loud but not uncomfortable.
Edits: 11/25/15
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