One inch waveguide/horn - which one?

[catapult]

Augerpro has started posting horn measurements. Of the ones he has posted so far, the 10"x14" QSC looks pretty nice and it's under $10.

http://sites.google.com/site/drivervault/driver-measurements

 

[Defo]

Does the small Stereo-Lab 1000hz tractrix beam less than the larger ones at higher frequenzies? Considering the larger ones are way longer in depth..

 

[sannax]

Hei Defo! I am under moderation (dont now why?), so I cant send you an email. If you want to speak about horns my nick in AVforum is Sannax. I am wondering about making some tractrix/La CLech horns to use with a compressiondriver..

 

[doug20]

Has anyone bought any of these lately?

I'm interested in 4, but John at AE speakers bought some a while ago and posted pics that were really off putting, especially as I'd have to import them.

Any feedback guys to make me feel more confident?

Assistance Audio says the bolt on DDS are still crap and they only are getting the screw on versions right now but they have none in stock.

 

[Brett]

Assistance Audio says the bolt on DDS are still crap and they only are getting the screw on versions right now but they have none in stock.

Thanks Doug, I'll have to try to source some of the QSC ones.

 

[Defo]

At which frequenzy does the TD12M beam 60 degrees?

Does the small Stereo-Lab 1000hz tractrix beam less than the larger ones at higher frequenzies? Considering the larger ones are way longer in depth..

Bumping these

 

[tinitus]

If you are very concerned about beaming I dont think you should cross any woofer much above 500hz

I though horn/waveguide beaming was controlled by the dispersion angles of the design

 

[ZilchLab]

If you are very concerned about beaming I dont think you should cross any woofer much above 500hz

I though horn/waveguide beaming was controlled by the dispersion angles of the design

The concept is to match woofer and waveguide directivity at the crossover frequency....

 

[jzagaja]

Don't we have many PA speakers crossed above 1kHz with 15" woofers?

I can supply Le Cléac'h and OS waveguides for competitive prices. Mainly for Europe. I have Stereo Lap 400Hz Tractrix and it has visible drawbacks.

 

[sannax]

Defo: which driver do you have for 1200hz and up..I guess some compressiondriver?

 

[jzagaja]

Why we have to buy compression drivers in Europe for 150-400 Euro when made to the same spec in China for almost ten times less? And we have to worry about the fitting.

 

[Defo]

Defo: which driver do you have for 1200hz and up..I guess some compressiondriver?

The plan is to use the AE TD12M which has exordinary good extension up 4khz on axis. I guess due to the low induction and phase plug.

The concept is to match woofer and waveguide directivity at the crossover frequency....

That was the idea yeah If dispersion of the 1000hz Stereo-Lab horn is 60 degrees, and good extension down to about 1800hz as stated earlier in this thread, then I need to know the 60 degree beaming frequenzy of the TD12M.

The crossover is active with 4th order LR slopes.

Why we have to buy compression drivers in Europe for 150-400 Euro when made to the same spec in China for almost ten times less? And we have to worry about the fitting.

Where do you buy these chinese versions?

 

[jzagaja]

Where do you buy these chinese versions?

I'm trying to find reliable source. But for example Wharfedale D532 1" Titanium cost only 20$ (American Music & Sound).

 

[longdrive55]

Is there a formula.....

The concept is to match woofer and waveguide directivity at the crossover frequency....

to determine woofer directivity at a given crossover frequency. I understand how to calculate when a woofer starts to beam, but can we calculate when a woofer is at 60* directivity vs. 90* directivity?

Or is this a measurement issue, requiring horizontal polars?

Thanks for any help you can provide.

 

[jzagaja]

An example - 15" woofer 90 deg (blue) starts to beam at 400Hz and Tractrix horn 400Hz, dome tweeter ca. 30 deg off-axis. Impossible to cross right.

 

[ZilchLab]

Re: Is there a formula.....

to determine woofer directivity at a given crossover frequency. I understand how to calculate when a woofer starts to beam, but can we calculate when a woofer is at 60* directivity vs. 90* directivity?

Or is this a measurement issue, requiring horizontal polars?

The chart in Dickason Fig. 0.14 suggests a 15" is 60° @ ~2 kHz.

There's a formula, Keele, I believe.

OR, you push a button, apparently. Here's a 12" JBL midbass driver:

 

[ZilchLab]

Re: Is there a formula.....

to determine woofer directivity at a given crossover frequency. I understand how to calculate when a woofer starts to beam, but can we calculate when a woofer is at 60* directivity vs. 90* directivity?

Or is this a measurement issue, requiring horizontal polars?

The chart in Dickason Fig. 0.14 suggests a 15" is 60° @ ~2 kHz.

There's a formula, Keele, I believe.

OR, you push a button in LEAP Enclosure Shop, apparently. Here's a 12" JBL midbass driver:

 

[catapult]

Or look at some actual measurements.

http://sites.google.com/site/drivervault/driver-measurements

TD12M at 0, 20 and 40 degrees.

 

[Defo]

Or look at some actual measurements.

http://sites.google.com/site/drivervault/driver-measurements

TD12M at 0, 20 and 40 degrees.

I cant really interpret the 60 degree beaming frequenzy from this... Any help?

 

[nullspace]

It should be noted that you'll also need to measure the horn/ compression driver combo in order to know precisely how the directivity changes over frequency...

Regards,
John