[apollophono]

I want to get some feedback on the Centrance MasterClass 2504 speakers.
Since they are coax is that considered single full range?  If not then you
can move to whatever circle appropriate.  At this time I'm running them
with a Dayton Audio DTA 100 amplifier and an iPod, iPhone or iPad.  I use
Onkyo HF player on all devices.  I must say they are pleasing speakers, but
they aren't the end all, of course.  I think they may give users a idea of
what it is like to run a single full range speaker.  I like its cohesiveness of
sound.  The low, mid and high are balanced well.  The high slopes off
considerably, but is still detailed enough for me; it may not be for others.
I think that can help with the harshness of digital music in general.  With
the low end I can hear kick drums, but not as strong as I would like. 
At $249 retail I think they are worth checking out if you are interested in
single full range speakers.

[RDavidson]

Coax are point source, but not single driver.
I can understand the confusion and where to start this thread though.

[apollophono]

RD: Thank you.  You are correct.  I should have thought it through a
little longer.  I remember now they do have a crossover.  Definitely
a no no for a single full ranger. 

[JLM]

I'd repost in the Enclosure Circle.

Being point sources coaxial drivers have much of the cohesiveness/imaging qualities of single drivers with some advantages (easier to extend frequency range, better directivity control) and several disadvantages (including a crossover and different drivers trying to sound like one source).  There is no perfect speaker.

Several companies offer coaxial speakers: Audio Pro Solutions, Cabasse, Devialet, Equator, KEF, ProSonus, and Tannoy come to mind.  Some of these have very good/well respected speakers.  For instance the Equator D5 are $400/pair, quite sophisticated studio monitors and are active (one channel of amplification per driver, built into the cabinet with DSP).

[jacozz]

Yes.
Strange enough full range speakers with bass help (FAST) seems to be allowed?
Bigger full range speakers with super tweeters seems to be allowed?
8 inch full range drivers with mechanical crossovers aka: wizzer cones seems to be allowed?
Why not Coaxials?

For me it's all about the point source phase correct sound. Thats what I care about, not the conservative idea of one cone or nothing kind of a approach.

[RDavidson]

I see your point, but coaxials are still not single drivers. There are two mechanically and electrically separate drivers in a coax. This is the "Single" Driver circle.
I don't think anyone is trying to be exclusionary here, just trying to be technically correct to what this firum is dedicated to. Instead of the Single Driver Circle, perhaps it should be renamed the Point Source Circle which would also include coax speakers. I think that'd be great, honestly.

[DaveC113]

It's all about where the xo point is. If a single driver covers <100 to >10000 Hz and also has a sub/tweeter then its basically a single driver that is being augmented. Coax speakers with compression drivers tend to xo around 1000 Hz which would not be acceptable and thus less interesting to a single driver enthusiast.

[JLM]

If one of the drivers can cover 7 octaves, it would be considered a single driver by the ground rules of this circle.   

There are several examples of coaxial audio speakers: Cabasse, KEF, and Tannoy each sell several models and are well known.  Electro Voice put out successful coaxial drivers in the 50's.  Hawthorne Audio currently sells dipole (open baffle) coaxial speakers.  Current active designs (low voltage crossover feeding one amplifier per driver) include Devialet that has gotten quite a bit of buzz lately and several studio monitors from Equator. 

The coaxial concept is a very nice compromise between single driver design and more conventional multiple driver speakers.

[DaveC113]

I'd agree JLM, the TAD Reference series coax is probably the best driver(s) in the world imo...

[JLM]

Calling the moderator....

ejfud, got your ears on good buddy?

Can we get your definitive answer to this question?