How to understand shared horn volume ?

[magnus h]

If combining two horns in a way that some of the horn volume will be shared, how will it affect the sound?

Below is a sketch to illustrate the problem. Using Hornresp, would the difference between the HD15 and HD215 be that the volume of b, c, and d would double but a would remain the same?

If this is the case, I guess that the tuning of the system will be lowered.

Any help appreciated

 

[USRFobiwan]

Interesting subject since I was thinking about doing a SS212 (kick) or SS215 bin Or even a Tham212 if that is possible. And was also wondering how the volume of combined throat is calculated is it dividing the path in half or 2/3 or just double up.

 

[msibilia]

Because of the symmetry of the arrangement, the pressure at any time on the "b" side of the centerline should be exactly the same as the pressure on the "b2" side of the centerline, so there is nothing to drive velocity across the centerline, just as if there had been a rigid piece of plywood preventing flow across the center.

I would model it with lengths equal to the single, areas doubled, and two cones driving.

Marc

 

[David McBean]

To simulate the HD215 assuming that the two drivers are connected in parallel:

Either

1. Simulate the HD15, and then use the Multiple Speakers tool to specify two speakers connected in parallel.

Or

2. Simulate the HD15, but with the intended HD215 solid radiation angle halved. For example, if it is planned to use the HD215 in 2 Pi half-space, then simulate the HD15 in 1 Pi quarter-space.

Frequency response and diaphragm displacement results for methods 1 and 2 are identical.

 

[David McBean]

I would model it with lengths equal to the single, areas doubled, and two cones driving.

... and also with Vrc, Vtc and Atc doubled.

 

[USRFobiwan]

I took the suggestion from Marc and took the SS15 and doubles up the driver and S* variables. Let me know if I missed something.

 

[magnus h]

To simulate the HD215 assuming that the two drivers are connected in parallel:

Either

1. Simulate the HD15, and then use the Multiple Speakers tool to specify two speakers connected in parallel.

Or

2. Simulate the HD15, but with the intended HD215 solid radiation angle halved. For example, if it is planned to use the HD215 in 2 Pi half-space, then simulate the HD15 in 1 Pi quarter-space.

Frequency response and diaphragm displacement results for methods 1 and 2 are identical.

Thank you ! This is really helpful information

 

[bitSmasher]

fyi HD15 should be in 4 pi if you're stacking it off the ground (ie over subs)

 

[David McBean]

Thank you ! This is really helpful information

Attachment 1 shows the input values for your SS15 example.

Attachment 2 shows the input values with SS15 cross-sectional areas doubled and 2 drivers connected in series.

Attachment 3 shows the input values for SS15 radiating into Ang / 2 and with Eg / 2 (because the 2 drivers are connected in series).

The frequency response results for:

* Attachment 1 with the Multiple Speakers tool used to specify 2 speaker in series
* Attachment 2
* Attachment 3

Are all identical, as are the diaphragm displacement results.