The D'Appolito, MTM Configuration

One speaker technology which is I think old but hasn't gotten the praise it deserves is the Joseph D'Appolito configuration.  In short, it uses a tweeter vertically sandwiched between two midwoofers.  Using two actual midranges is a variation on the theme. 

What got me thinking of this was the $220,000 speaker pair that appeared on Stereophile's coverage of the Florida Audio Expo, which made me think, fondly, of the original, 1980's era  Focal Utopia where I first heard this arrangement. 

It's a very good arrangement for those who love detail and want a speaker that's relatively easy to live with.

How about you? Have a pair of D'Appolito-like speakers ever won you over?


I used to own a pair of the Aria 5 speaker kits back in the late 90’s.

This was back when Focal still sold raw drivers to us DIY’s.

These were probably the very first D’Appolito kits available. I built them from scratch. Not being a woodworker, my enclosures, while being acoustically sound, were not exactly the best looking. But I was actually somewhat ahead of my time, using inert tar like material (I wish I could remember what it was) with sand mixed in to coat the inside walls of the enclosure. Really deadened the box.

This Stereophile article from 1990 says the kits were $600, about $1400 today, was a bargain back then.

Aria 5

What I can remember about them, is, they had incredible detail. One would seriously have to spend several many times as much on a commercially available speaker to top them.

And the same goes for soundstage and imaging. Nothing in the $600-$700 range at the time even came close..

I am still a DIY’r. and today, I believe building a DIY kit yields a speaker that sounds about as good as a commercially available speaker at about 5 times the $$. Back then, I think the margin was even greater. Maybe 8 times.

These aren’t the ones I built, but they look similar.


ARIA 5 kist

I owned Duntech Sovereign speakers in the late 80's/early 90's these used this approach for all the drivers, but John Dunlavy used shadow first order crossovers. The big disadvantage of this design is that the tweeters had far less per handling capacity than the rest of the system and we're very easy to blow if you played them to loud.