Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[tkroeker]

I am wondering what would be the effect of stacking a pair of JBL VRX the " incorrect" direction ( i.e. ) vertical top to bottom would be twelve, horn, horn, twelve.

[Ray Aberle]

I am wondering what would be the effect of stacking a pair of JBL VRX the " incorrect" direction ( i.e. ) vertical top to bottom would be twelve, horn, horn, twelve.

.............. so on end? As opposed to using any of the integrated flygear that allows for them to be pole mounted, flown, or ground-stacked safely?!?

-Ray

[Ivan Beaver]

I am wondering what would be the effect of stacking a pair of JBL VRX the " incorrect" direction ( i.e. ) vertical top to bottom would be twelve, horn, horn, twelve.

What would be the purpose?

[eric lenasbunt]

Please don't see you need more horn coupling, those horns are out of control as it is...

[David Sturzenbecher]

I am wondering what would be the effect of stacking a pair of JBL VRX the " incorrect" direction ( i.e. ) vertical top to bottom would be twelve, horn, horn, twelve.

Bad things...

[Riley Casey]

OK, here's the callous answer.  If you have to ask thats a pretty good indication that you should back off from designing a new and different speaker and simply copy ( if you want to get your wood working jollies out ) an existing designed by someone who already knows the answer to the question.  With the sources ( speakers and high frequency horns ) vertically aligned the horizontal coverage pattern will be reasonably predictable.  With the same frequencies being produced from sources offset horizontally the aggregate horizontal dispersion will be an unpredictable mess of peaks and nulls.

...I am working on some DIY mid high cabinets and was considering horns similar to their design but it would work out better to run two of them over and under instead of both vertical. "bad things " means...

[Ray Aberle]

I love how the question changed once people started calling you out. Todd, you'll get better answers (and a better standing in the community) if you give us the straight story from the beginning, as opposed to some bullshit that you then recant rapidly.

-Ray

[Ivan Beaver]

OK here's why,,, I am NOT doing this with a pair of JBL VRX. I am working on some DIY mid high cabinets and was considering horns similar to their design but it would work out better to run two of them over and under instead of both vertical. "bad things " means

I was hoping to get a simple answer because I assumed since I never see array or similar wave guides ran that way then I shouldn't but if its just the way the manufactures just happens to be ...

I used the vrx's as an example to make it easier to picture what the question was.

Whenever you have 2 devices that are covering the same listening position, that are spaced more than 1/4 wavelength from each other at the listening position, you will get notches in the response.

This is called combfiltering. 

Here is a link to somthing I wrote many years ago about it.

http://www.dbaudioandvideo.com/files/resource/loudspeaker_placement_rev041021.pdf

[tkroeker]

wow...

[olakunle odebode]

Whenever you have 2 devices that are covering the same listening position, that are spaced more than 1/4 wavelength from each other at the listening position, you will get notches in the response.

This is called combfiltering. 

Here is a link to somthing I wrote many years ago about it.

http://www.dbaudioandvideo.com/files/resource/loudspeaker_placement_rev041021.pdf

Would you have a more current link to this document, cos its no longer available online?

[ProSoundWeb Community]