Magnepan - 80+100-400hz being sucked out and looking for advice - Page 2 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #11 of 17 Old 10-30-16, 11:56 AM
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Re: Magnepan - 80+100-400hz being sucked out and looking for advice

Which plot is what? I just wanted you to move the seat forward - you moved it back. Also, didn't want to change distance to the wall you face, just the spacing between the speakers.

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post #12 of 17 Old 11-05-16, 10:55 AM Thread Starter
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Re: Magnepan - 80+100-400hz being sucked out and looking for advice

I went back to the original setup, then moved the speakers out 6". No major change.

Then I accidentally re-ran the scan at a higher volume and heard a buzz. Grabbed my flashlight and discovered some of the wires had barely come loose from the mylar, bass wires only and mostly at the upper tips, one section in the middle. I spent the past week resolving that (77 to hold and 3m 30nf for perm bonding) and patched two very small rips (1/4") in one speaker.

After resolution there was no change in the frequency response, but the volume output was enhanced. Figured it was best to cover my bases, just in case there was a mechanical cause for the issue but no such luck

With that I replaced the speakers in the original spots and did more testing, and after a few (hundred) runs this is the best I've been able to find.

Both speakers are 4ft from the wall, right is directly 1' back from original position and out about 3-4". Spacing between the inner side of each speaker is 100". Left speaker is slightly skewed to the left as compared to the right by 1', bringing it to being equidistant from the center drops the midrange. Distance from listening position is 12.9ft for left and 12.2ft for the right as measured by audessey.
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post #13 of 17 Old 01-28-17, 01:23 PM
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Re: Magnepan - 80+100-400hz being sucked out and looking for advice

This is really interesting, I get an almost identical suckout with my 1.6's but they are in a much smaller room. I've wasn't sure it it was real or a measurements artifact. I'll be curious to hear what you find. Good luck!
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post #14 of 17 Old 01-28-17, 01:44 PM Thread Starter
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Re: Magnepan - 80+100-400hz being sucked out and looking for advice

Wish I had better news. I've tried hundreds of positions in many different configurations, but am limited by the overall layout of the room.

In the end I pushed the speakers back, much closer to the wall behind them. They are now at about 20" away from the wall and the seating position is also moved up closer to the television, with an absorber directly behind each speaker on the wall. Closer than that causes the sound to become unnatural and have large disturbances in the response curve, further away (until 4-5+') the rear reflections are near impossible to tame without a wall full of absorbers (which I can't do) and causes the soundstage to be affected negatively. At the current distance from the rear wall, the absorber behind is able to effectively reduce the initial couple ms worth of reflections down quite a bit, while leaving me with a fairly large soundstage.

I still have a big variance in my response curve though, but this placement also maximizes the midrange's flatness, which of course effects voice heavily.

I'm not really happy with it unfortunately and may have to give up on maggies in the basement if I find the right next step. I love the sound, but the room is not right.
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post #15 of 17 Old 02-19-19, 04:52 PM
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Re: Magnepan - 80+100-400hz being sucked out and looking for advice

Interesting to hear that you use absorbers help manage reflections. I ran them back in the 80's, no absorber.

I was running MG-II's. I don't know how the 3.5's are made. MG-II's were supposed to use the back wall to help create the bass, and absorbers would seem counter-productive. As I recall, the sweet spot was 20-24 inches from drywall wall, no angle. I seem to recall my chair was about six or seven feet away, and there was an awesome sound field.

As per recommendation, I even had the requisite piece of yarn tied to a carpet fiber to know where to move my chair to when I wanted some solo listening time. Well before the idea of the "man-cave", where I could have left the chair in one spot. Kids, wife and friends kinda dictated the general placement of furniture.

Anyway, more of a commentary from down memory lane. Wish I could be of help to you.
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post #16 of 17 Old 03-09-19, 06:51 AM
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Re: Magnepan - 80+100-400hz being sucked out and looking for advice

It sounds like a phase problem in the xover design... A Dirac live processor will greatly reduce phase and time alignment issues - Audessy does very little to correct phase issues.. The results in my system were very dramatic though I dont have Maggies - I have a planar magnetic / woofer combo design

https://www.minidsp.com/products/dirac-series/ddrc-24
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post #17 of 17 Old 03-25-19, 05:19 PM
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Re: Magnepan - 80+100-400hz being sucked out and looking for advice

Agreed on Audyssey. IN my experience diffusion pretty much always trumps absorption behind the Maggies.
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