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In Reply to: RE: TAS Reviews the Magnepan 20.7 posted by Davey on November 28, 2014 at 07:38:03
Do you really think they left the LPs out of mid XO? If so, wouldn't the 1st order tweeter HP show up in the impedance and phase? Or do you think they put a zoebel network to iron out phase?
I have put my Tympani bass panels in equidistant arc setups with the mids and tweeters and used 1st order slopes in symmetrical and spaced alignments. It makes a very significant difference in image precision. It is very obviously lacking in the Limage setup where it turned out better to just cut it off with an LR4 and forget about time alignment. I trade off a bit of the fine imaging performance for an order of magnitude more bass.
Follow Ups:
Has anybody seen the crossover network for the 20.7? How do you know it's even first-order? :) How do you know if there's a Zobel in use or not?
As usual, your postings are full of speculation with no valid data points to back it up.
I was commenting on the theoretical alignments of generic first-order crossovers. However, I have no knowledge of whether the Maggie 20.7 employs this topology or not. It's very clear that no specific information will ever be forthcoming from Magnepan, so we're waiting on a knowledgeable user to divulge this at some point.
Cheers,
Dave.
Of course they didn't say. But the rumor mill keeps coming up with 1st order series XO. Also implying this is the new recommended aim for the 20.7 to be set on axis rather than face forward with minor toe in, as they had suggested for placing the 20.1.
There is no other option but to speculate since we can't expect anyone to void their warranty by looking inside. I know it gets on your nerves, but that is what is available to us, possibly not better than nothing.
You can't extrapolate on meaningless data. ;)
Regardless, a 1st order crossover with "no phase throughout most....." is not an "achievement"....that characteristic is inherent. It would be an achievement if it WASN'T a zero phase angle.
Besides, I think we've already found errors in the respective German test reports you mention. So, I wouldn't take it as a given their measured phase response is even accurate. :)
When the TAS 20.7 review appears online, I will be interested to read it.
Dave.
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