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In Reply to: RE: Polarity reversed in 2.7 QR tweeter posted by scolley on June 14, 2015 at 11:42:03
The "Peter Gunn" crossover solves every issue the speaker has, or ever will have. I suggest to go that route.
Dave.
Follow Ups:
I suspect the OP doesn't realize you are being sarcastic.
To the OP: PG started off with SMGa speakers which have a series crossover. He then applied a series crossover to the MMG and felt there was improvement -- including a boost in output which definitely does not occur. He concluded that every Magnepan model ever made was better with a series crossover. He then designed (actually he had a partner do the design as he has limited knowledge of how to design a crossover) series crossovers for a bunch of the models. Whether his design sounds better or not, I am unable to opine but I can guarantee that the speakers will sound different.
In all fairness to PG, he made everyone aware of how wood frames improved the Maggie's and his woodworking ability is superb. Also it is interesting that Magnepan is now using series crossovers for the X.7 series.
Thanks for the clarification neolith. So the upshot of your comment seems to be "Take the PG solution with a grain of salt, and rest assured will sound different."
Thanks for the help.
I just got home and I am now going biking for a short while, but I started reading the thread as I drank some water before leaving.
Well, I spit out the water violently when I read his statement! LOL, my PC screen required emergency Bounty treatment.
There seem to be a bit of misunderstanding on how crossovers work, just as Davey pointed out. You can steer the loobing of the speaker with the crossover in a wanted direction. In the case of speakers having their drivers side-by-side, it is often necessary to steer the loobing this way. It is slso dependent on the orientation of the speakers in relation to the seating position. Having a panel speaker like Magnepan firing towards the listening seat or not need to be considered. Apogee were different to Magnepan in this respect.
Sounds like good advice. Thank you. :-)
As we "suspect" Davey was speaking in jest, the PG XO for 3 way maggies does not appear to have the same success his 2 ways have had. I would take that option off the table unless you are just curious about it and willing to go through the trouble just for that.
Well, as mentioned in the other thread, this is one of those models they (Magnestand) alter from 3-way to 2-way. They simply wire the mid and tweet in parallel. That means the tweeter is driven nearly a full octave lower in frequency than it would have been otherwise. This is a QR tweeter so it will tolerate it from the power perspective, but it does create a rather different acoustic integration. How well it works in this case I'm not sure.
It seems to me PG's crossover guy never veers very far from textbook electrical alignments of the series networks. The schematics I've seen are all like that, but I haven't seen all of them.
Cheers,
Dave.
That is also something he also tried with the 3.6 using the mids and bass together into a 2 way and there was a particular angle in which it came together. Sweet spot was narrow. I think this makes the 3 ways have the same dispersion problem the 2 ways had as the tweeter is now far from the center of the mid (and now also bass) panel.
I guess the next logical step would be to just wire all three drivers in parallel to implement the full mechanical crossover. :)
I don't think there's any particular design discipline at work at the Magnestand factory. That's okay though and could be said of quite a few speaker manufacturers. This is not rocket science and many non-technical folks can achieve pretty good results.
Dave.
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