New MMT from Dennis Murphy with SOTA drivers!

[Dennis Murphy]

Not trying to hijack the thread, but just to let you know, the tweeter I'll be working with on the Purifi MMT should be of interest to speaker junkies. It incorporates a lot of new technology and I don't think anyone else is using it yet. It can be crossed at 1200 Hz with 180 degrees radiation. Here's a link to an AudioXpress article about it: https://audioxpress.com/news/the-airblade-transducer

 

[Ericglo]

Not trying to hijack the thread, but just to let you know, the tweeter I'll be working with on the Purifi MMT should be of interest to speaker junkies. It incorporates a lot of new technology and I don't think anyone else is using it yet. It can be crossed at 1200 Hz with 180 degrees radiation. Here's a link to an AudioXpress article about it: https://audioxpress.com/news/the-airblade-transducer

That driver looks interesting, but it is expensive at $1300.

 

[Dennis Murphy]

That driver looks interesting, but it is expensive at $1300.

Yup--pretty much just audio porn. I guess someone out there will be able to afford them.

 

[Ericglo]

Yup--pretty much just audio porn. I guess someone out there will be able to afford them.

No doubt. Wasn't there like 20 some odd thousand Wilson Watt Puppys sold? I am a sucker for interesting new tech that delivers. I am looking forward to seeing these things in action.

 

[yourmando]

I remember reading about this a couple of years ago but like you say, not much talk about it and I started to wonder if it was vaporware.

Sounds like a great candidate for an in-depth @hardisj driver review--if they're obtainable. 180 degree horizontal dispersion, linear phase & impedance, & dipole capable sounds wild.

I wouldn't mind if @Dennis Murphy started a thread as well on how he's able to cross this over with woofers while keeping the directivity transition smooth. That would seem to be the big challenge.

 

[Dennis Murphy]

Sounds like a great candidate for an in-depth @hardisj driver review--if they're obtainable. 180 degree horizontal dispersion, linear phase & impedance, & dipole capable sounds wild.

I wouldn't mind if @Dennis Murphy started a thread as well on how he's able to cross this over with woofers while keeping the directivity transition smooth. That would seem to be the big challenge.

Well, I'll certainly report on what I find. But I'm not anticipating too much of a problem if I cross at 1200 Hz. The stock version isn't a dipole. At least I hope it isn't. But I did a 2-way with the original Heil Dipole AMT crossed at 1200 Hz, and that worked out with only a little hair pulling.

 

[Ericglo]

Well, I'll certainly report on what I find. But I'm not anticipating too much of a problem if I cross at 1200 Hz. The stock version isn't a dipole. At least I hope it isn't. But I did a 2-way with the original Heil Dipole AMT crossed at 1200 Hz, and that worked out with only a little hair pulling.

Do you have one of these Airblades for testing?

 

[Dennis Murphy]

Do you have one of these Airblades for testing?

This is a project for Jim Salk, and I should have the test cabinet with drivers next week. We'll see--sometimes these newfangled audio thingies don't quite live up to their promise. At least I didn't have to pay for these puppies. Anyhow, back to more affordable Purifi designs.

 

[Chromatischism]

Sounds like a great candidate for an in-depth @hardisj driver review--if they're obtainable. 180 degree horizontal dispersion, linear phase & impedance, & dipole capable sounds wild.

And made of unobtanium.

It sounds like a good candidate for a waveguide if used in a forward-firing speaker, or for a very expensive omni design. I can't help but think that the Ohm Walsh would be more cost effective for the latter use case, though.

 

[Ilkless]

Sounds like a great candidate for an in-depth @hardisj driver review--if they're obtainable. 180 degree horizontal dispersion, linear phase & impedance, & dipole capable sounds wild.

I wouldn't mind if @Dennis Murphy started a thread as well on how he's able to cross this over with woofers while keeping the directivity transition smooth. That would seem to be the big challenge.

http://www.christensenaudioip.com/

FR measurements here. Crossing at 1kHz for the driver CtC would really help directivity. However, I can't help but think that the Purifi has better distortion than most HF transducers 1-3kHz, so crossing low actually detracts from letting the driver show its full potential.

 

[Rick Sykora]

Creating thread for really promising new speaker that @Dennis Murphy announced in another thread.

It uses the new Purifi woofer with an airblade tweeter...

Hope Dennis will share more as his plans progress!

 

[Dennis Murphy]

Thanks for starting this thread. This isn't a design I'll be selling under my moniker. It's for Salk Sound, and neither Jim nor I has any idea how it will turn out. I'll be getting the cabinet and drivers next week and I'll post my reactions, up or down. This isn't the sort of project that will likely have much commercial appeal due to the extreme cost of the drivers. But it will be great fun for me, and Jim is picking up the tab.

 

[Dennis Murphy]

And made of unobtanium.

It sounds like a good candidate for a waveguide if used in a forward-firing speaker, or for a very expensive omni design. I can't help but think that the Ohm Walsh would be more cost effective for the latter use case, though.

A wave guide is probably the last thing I would want to use. It kind of defeats the whole purpose of the design, while raising the risk of coloration. And you don't need one to get a very low crossover point where the woofer isn't beaming. But maybe I better get my hands on the tweet before I cast any opinions in stone.

 

[Chromatischism]

A good waveguide doesn't cause coloration. I know what you're referring to though, and that was caused by the combination of the tweeter size and crossover point. The waveguide likely helped compared to a bare driver. It was the compromise to get wide and consistent directivity to 20 kHz (and beyond).

 

[Dennis Murphy]

A good waveguide doesn't cause coloration. I know what you're referring to though, and that was caused by the combination of the tweeter size and crossover point. The waveguide likely helped compared to a bare driver. It was the compromise to get wide and consistent directivity to 20 kHz (and beyond).

I'm not sure which speaker you're referring to, but in any event I didn't say a waveguide would inevitably introduce coloration. It just raises the risk if the guide isn't very carefully designed. Harman knows how to do it correctly. But others don't, including some very well known designers. In any event, I'm still not sure why you think the Air Blade would be a good candidate for a wave guide.

 

[Chromatischism]

I'm not sure which speaker you're referring to, but in any event I didn't say a waveguide would inevitably introduce coloration. It just raises the risk if the guide isn't very carefully designed. Harman knows how to do it correctly. But others don't, including some very well known designers. In any event, I'm still not sure why you think the Air Blade would be a good candidate for a wave guide.

I was thinking of matching directivity to the other driver(s) since nothing else is going to reach 180 degrees. I can't help but think how that wouldn't wreak havoc on imaging in a small room, too. I am interested to see the result of your experiment.

 

[hardisj]

I'm sorry... but can someone tell me how this thing is to be mounted to a traditional baffle? I'm baffled.

Edit: Nevermind. I googled it.

 

[yourmando]

Looks like their demo units have it sealed sealed on a box and sealed on top and bottom of the curved “mouth”

Below, it looks like they slotted the Arya Airblade in like a hard drive

Looks like others have the idea of combining with the Purifi woofers, here in MTM:

 

[yourmando]

This presentation on the techonology is interesting

He demos the unsealed version so it’s an open dipole. He passes it around while it’s playing, so it must not be that fragile

 

[whazzup]

Looks like their demo units have it sealed sealed on a box and sealed on top and bottom of the curved “mouth”

View attachment 82393

Below, it looks like they slotted the Arya Airblade in like a hard drive

Looks like others have the idea of combining with the Purifi woofers, here in MTM:

View attachment 82394

Hey who took my dentures and stuck them in a speaker!? Now that speakers have mouths, maybe vocals will sound even sweeter....