Sloped baffle

Thanks again Bombaywalla. I caught the article. It doesn't speak to the impact of the speaker's electrical characteristics on phase coherence. Maybe it's just a non-issue.

@Tim ... based on the various posts in this thread, I gather there are not very many conventional speaker brands that are time and phase coherent. Vandersteen, Thiel and GMA come to mind.

As to your point about flat impedance and phase angle plots, take a look at the stats on the Magico S5 here:

http://www.soundstagenetwork.com/index.php?option=com_content&view=article&id=1043:nrc-measurements-magico-s5-loudspeakers&catid=77:loudspeaker-measurements&Itemid=153

Not saying the S5 is an easy speaker to drive because its impedance plot ranges for the most part between 3 and 4 ohms and its phase angle goes negative in the low bass, but overall pretty flat plots. I think my ARC Ref 150 could drive it ok off its 4 ohm taps, especially since my amp has a pretty muscular power supply - 1040 joules. OTOH, I would not try to drive the S5s with a low power SET amp. :)

I find the phase coherence issue to be extremely interesting. It's frustrating because without doing critical listening, it's hard to get one's "ears" around the issue.

Thanks Psag for bringing this important issue to our attention. Just not sure what to do with it. :)

BIF

Those S5 plots are actually quite smooth. A sign of well matched, quality drivers, a good cabinet and unobtrusive crossovers. That phase dip in the bass is fairly standard and hard to avoid. It's from the woofer, not the xover. Other than the low impedance, it would be a relatively easy load. Of course, there's always ways to make those plots look better but it might not sound any better.

Ngjockey ... I concur with your take on the S5 stats and build quality. As far as the X-over is concerned, not sure what you mean by unobtrusive, but I'd be willing to bet we're talking about 2nd and 3rd order X-overs here.

Fyi, I traded e mails with Magico tech folks about phase coherency. They freely admitted that the S5 is not phase coherent, but that attribute was a trade off in order to achieve other design objectives.

Gotta give these pups a listen!

07-07-14: Bifwynne
Thanks again Bombaywalla. I caught the article. It doesn't speak to the impact of the speaker's electrical characteristics on phase coherence.

I am totally confused here Bifwynne!! I don't understand your question - what do you mean by "the impact of the speaker's electrical characteristics on phase coherence"??
I've pointed you to Roy's article that talked about the impact of the electrical x-over on time-coherency.
I've pointed you to Roy's article that talked about the impact of the driver construction on time-coherency.

The x-over is the electrical part. the driver construction is the mechanical part.

These 2 articles should have covered the info you were looking for.....

Bombaywalla, sorry for the confusion. I'm referring to a driver's electrical, not mechanical, attributes. Rather than go off on a tangent, if Al catches these last few posts, he might be able to untangle what I'm trying to say. In the meantime, I'll just assume that the only relevant driver attributes that affect phase coherency are the mechanical points Roy discussed in his White Papers.