Do MA drivers suits OB project?

[dekiller]

Just wonder if MA drivers are suitable for OB as I am not familiar with other brands.

 

[Godzilla]

I have seen them used several times before. I'd imagine the results are good.

https://get.google.com/albumarchive...Fz144AgHoK?source=pwa&authKey=CMKFxZnUlNrfrQE

 

[chrisb]

Certainly for the mid-tweeter application, but for the heavy lifting of the bottom -- or so octaves, I think it's fair to say that the cliche about no replacement for displacement is more true than ever

 

[GM]

Right, without some form of EQ [room gain, horn loading, more drivers, etc.], OB is only effective down to the driver's upper mass corner [Fhm = 2*Fs/Qts'], so if loading to Fs is desired, Qts' = 2.0, a value that is considered 2x the limit for HIFI apps, making OB loading down to 2*Fs the max and usually ~3-6*Fs for 'FR'/wide range drivers.

Qts' = Qts + any series resistance

GM

 

[dekiller]

Thanks a lot. As I found the PureAudioProject OB speakers looks very nice without the usual width seen on other OB speakers, I will consider a similiar project in the future. The reason why I consider MA drivers first is because I don't like the phase plug.

 

[dekiller]

Besides, their custom made 15" OB woofer are availiable at $400/pr. This make the project more easy.

 

[chris661]

I expect they'll do just fine as the mid-high driver on an OB. I'd still recommend reasonably steep crossover slopes, though - the MA drivers tend to have very soft suspensions, and with no acoustic loading from a cabinet, there's a risk of damage or (at least) lots of distortion when the bass comes along.

Chris

 

[gazzagazza]

Alpair 7 on open baffle over an Eminence 12A. Alpair on a 2nd order high pass at about 350 Hz. Plenty of loud use for both music and movies over a couple of years. No sign of any harm to the Alpair despite its diminutive size.

Sent from my x600 using Tapatalk

 

[Steve Duffy]

The MA 12Ps are fine on open baffle, acoustically crossed down at about 300Hz with the H frame DSP crossed. They do remarkably well sound fabulous and with no signs of excess travel in a 4x8m room for the last 2 years.

 

[zman01]

Steve,

You have a pic of your setup?

 

[Steve Duffy]

Hi thread here http://www.diyaudio.com/forums/multi-way/297485-open-baffle-drug.html

 

[zman01]

Hi thread here http://www.diyaudio.com/forums/multi-way/297485-open-baffle-drug.html

Thanks.