I would think there is a problem with the speakers. 9 DB down in the highs? If the LRS sounds good on the same equipment in the same room, something wrong with the 1.7s.
My New Magnepan 1.7i's sound dull and lifeless on the top end...why?
First time Magnepan owner - 5 days old 100+ burn-in hours on them
Associated Equipment:
-Denafrips Terminator Plus
-Holo Audio May KTE version
-Pass Labs X22 Pre-amp
-PrimaLuna EVO 400 Pre-amp
-Pass Labs XA100.8 Monos
-PrimaLuna EVO 400 Monos
-AntiCables interconnects and speaker cables
-Stock tweeter attenuator jumper replaced with AntiCables level 5 spade jumpers on the 1.7i's
My spectrum analyzer indicates both speakers highs are falling off beginning at 1.25K and are 9db down from 2.5K on
Been playing around with speaker placement and room treatments for 2 days now without any remediation. What am I missing? Suggestions appreciated.
Associated Equipment:
-Denafrips Terminator Plus
-Holo Audio May KTE version
-Pass Labs X22 Pre-amp
-PrimaLuna EVO 400 Pre-amp
-Pass Labs XA100.8 Monos
-PrimaLuna EVO 400 Monos
-AntiCables interconnects and speaker cables
-Stock tweeter attenuator jumper replaced with AntiCables level 5 spade jumpers on the 1.7i's
My spectrum analyzer indicates both speakers highs are falling off beginning at 1.25K and are 9db down from 2.5K on
Been playing around with speaker placement and room treatments for 2 days now without any remediation. What am I missing? Suggestions appreciated.
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- 82 posts total
Getting good measurements of large dipole loudspeakers is not trivial. By way of example, John Atkinson uses a fairly sophisticated quasi-anechoic measurement technique and you can see his frequency response measurement of the Magnepan LSR on this page, Figure 2: https://www.stereophile.com/content/magnepan-lrs-loudspeaker-measurements Compare that with the frequency response Amir Majidmehr of Audio Science Review recorded using a state-of-the-art, hundred-thousand dollar computer-controlled Klippel measurement system, second graph in the first post on this page: https://www.audiosciencereview.com/forum/index.php?threads/magnepan-lrs-speaker-review.16068/ There is so little resemblance between those two curves that you’d never suspect they were the same loudspeaker. And imo conspicuous by its absence is the "in room" curve that John Atkinson normally runs, perhaps because he was unable to get good data using his normal in-room-curve measurement technique. My point being, it is extremely unlikely that casual non-gated in-room measurements made with a spectrum analyzer are "accurate" when there is major inconsistency between far more sophisticated, industry-standard measurement techniques. This is a situation where I would say, trust your ears far more than you trust your measurements. Duke |
I have a pair of 1.7is. I recommend until you are very familiar with the Maggies and sort this issue out, that you run them only on solid state equipment. I have not looked up the specs on those Pass Labs monoblocks. But I would use those and the Pass Labs solid state preamp. I would put back in the stock steel plate jumper for now. Also check the fuses to make sure they aren’t blown. Make sure all your cable connections are good ones. Play music that is well recorded. Examples would be Steely Dan Aja and Goucho. If there still is a problem call Magnepan. Normally the highs aren’t as big an issue as the lack of bass impact. When yiu get this sorted there are other modifications that would make a difference. |
andrewmg7 posts07-28-2021 5:56pmHave you tried using the stock u-shaped jumper in place of your anticables attenuator? Seems a likely culprit.... I'll try that. thx |
- 82 posts total