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Title: Suggestions for setting up Danley TH 115 in cardioid operation?
Post by: Tommy Shannon on August 04, 2016, 07:16:43 PM
Hello PSW'ers,

I haven't experimented with this yet, but plan on doing so soon. Has anyone done this and have recommendations? Fwiw - I usually 'stand' them up rather than lay them down. Also, my crossover is usually set to 24 db/octave Linkwitz Riley at 100hz for the subs.

Thanks in advance!

Tom
Title: Re: Suggestions for setting up Danley TH 115 in cardioid operation?
Post by: Ivan Beaver on August 04, 2016, 07:59:29 PM
Quote from: Tommy Shannon on August 04, 2016, 07:16:43 PM
Hello PSW'ers,

I haven't experimented with this yet, but plan on doing so soon. Has anyone done this and have recommendations? Fwiw - I usually 'stand' them up rather than lay them down. Also, my crossover is usually set to 24 db/octave Linkwitz Riley at 100hz for the subs.

Thanks in advance!

Tom
The Tapped horns follow the same basic math that any other sub does for directional configurations.

Basically you determine the center freq of interest-figure out the wavelength, then divide by 4 to get the 1/4 wavelength.

Then figure out the delay time associated with that distance.

Put that delay time on the rear sub and invert the polarity of the rear sub.

It really doesn't matter if they are standing up or laying down

Here is a model from the Danley free modeling program-DIRECT.

You can download it here:
   
http://www.danleysoundlabs.com/support/ddt-files/ 

I put a mic 30' in front of the cabinets and a mic 30' behind the front of the cabinets.

The spacing is 4.5' and the delay is 4ms.

You can very easily adjust the delay and physical distances and watch the response of each mic and the coverage plot all change in real time.  So you can fine tune if needed.
Title: Re: Suggestions for setting up Danley TH 115 in cardioid operation?
Post by: Ted Christensen on August 05, 2016, 12:27:25 AM
Quote from: Tommy Shannon on August 04, 2016, 07:16:43 PM
Hello PSW'ers,

I haven't experimented with this yet, but plan on doing so soon. Has anyone done this and have recommendations? Fwiw - I usually 'stand' them up rather than lay them down. Also, my crossover is usually set to 24 db/octave Linkwitz Riley at 100hz for the subs.

Thanks in advance!

Tom

I have found an odd number of subs work best. 2  normal subs for every 1 backwards.
Title: Re: Suggestions for setting up Danley TH 115 in cardioid operation?
Post by: Tommy Shannon on August 06, 2016, 12:39:48 AM
Quote from: Ted Christensen on August 05, 2016, 12:27:25 AM
I have found an odd number of subs work best. 2  normal subs for every 1 backwards.

Good point - and you just made Ivan a very happy man  ;)