Reverse mounting a kappa pro 15a

[Music is life]

Normally such a driver would be good out to 600hz or more on the top end.
Does anyone have a clue what the top end would be if it was reverse mounted? I'm hoping for 400 to 500hz.

[Paul O]

Re: Reverse mounting a kappa pro 15a

Curious as to why you would want to reverse mount this driver? It is a good low/mid capable of going well into the kilohertz range(I have some crossed at 1khz) but reverse mounting is going to limit that for sure.

[Music is life]

Re: Reverse mounting a kappa pro 15a

Curious as to why you would want to reverse mount this driver? It is a good low/mid capable of going well into the kilohertz range(I have some crossed at 1khz) but reverse mounting is going to limit that for sure.

I'm experimenting with an 80 hz horn and reverse mounting helps it fit.

[Sydney]

Re: Reverse mounting a kappa pro 15a

imo - that's too high for a 15" in a horn ( especially if folded ).

[Music is life]

Re: Reverse mounting a kappa pro 15a

imo - that's too high for a 15" in a horn ( especially if folded ).

It's not folded.

[Sydney]

Re: Reverse mounting a kappa pro 15a

Note I said especially - If you run an impedance sweep you'll notice that you'll resonance peaks as you get that high.
If it isn't folded - an 80Hz horn is very large - how big is this?

[Music is life]

Re: Reverse mounting a kappa pro 15a

Note I said especially - If you run an impedance sweep you'll notice that you'll resonance peaks as you get that high.
If it isn't folded - an 80Hz horn is very large - how big is this?

Imagine the number 7. That is close to the shape of the horn where the driver is placed on top pointing down as far back toward the corner. In the current experiment the downward slash of the "7" is 36" in length. The top horizontal panel is 22" in depth. This experiment is 17 " wide. 0 compression. The gain is about 3 to 4 db. I've not used the Kappa pro 15a with this experiment yet. Rather I've tried 4 Beta 6a's tuned to 90Hz. Really liked the results so far.

[Sydney]

Re: Reverse mounting a kappa pro 15a

Conceptually it resembles a "Scoop".
The term horn is often used loosely; an 80Hz sound wave has a 14' wavelength.
A classic full horn can have a mouth as large as 8' x 8'.
If you familiar with the behavior of sound as it encounters an object ( including horn walls ), than the impact on wavelengths that are 22.75" - 27" inside this horn path should be considered.

[Music is life]

Re: Reverse mounting a kappa pro 15a

BTW Wayne Parham used a design like this in the past. He ran it much lower and much higher and it was larger I'm sure. But I have no idea what the specifics were. And I don't know how to model such a thing in Horn Response.

What I'm trying to get around is the hight of the unit once a pro sound 15" driver is used. One part of the solution is reverse mounting. Then other design changes to get enough rear volume to tune to about 65Hz.

[Sydney]

Re: Reverse mounting a kappa pro 15a

One of the compromises of horns is that the gain comes at the expense of extended bandwidth, a sort of "no free lunch" thing.
For every doubling in frequency the wavelength is divided in half.
Haven't heard these - Scoops have following, not for me though.

[Music is life]

Re: Reverse mounting a kappa pro 15a

One of the compromises of horns is that the gain comes at the expense of extended bandwidth, a sort of "no free lunch" thing.
For every doubling in frequency the wavelength is divided in half.
Haven't heard these - Scoops have following, not for me though.

It's not a scoop. Both the front wave and the port are loaded into the horn mouth where there is no compression. It's a simple conical horn.

[Music is life]

Re: Reverse mounting a kappa pro 15a

My question is, "how high can a reversed mounted 15" pro sound driver go with clarity?"
If anyone knows this please let me know.

[Sydney]

Re: Reverse mounting a kappa pro 15a

It's not a scoop. Both the front wave and the port are loaded into the horn mouth where there is no compression. It's a simple conical horn.

Pardon, this describes more of a tapped horn ( guess I'd have to see it ).
Most conical horns I'm familiar with have a sealed rear chamber.
But still I'd stay a octave below that ( say 200 - 250 Hz )
Anyway carry on ...

[billfitzmaurice]

Re: Reverse mounting a kappa pro 15a

My question is, "how high can a reversed mounted 15" pro sound driver go with clarity?"

Not very, as I don't see how you'd keep the throat area as small as it needs to be for loading of high frequencies, nor how you'd manage a phase plug.

[Music is life]

Re: Reverse mounting a kappa pro 15a

Thanks Sydney and Bill.
I might put some pictures up later to better explain the project.