Midbass in a Backloaded Horn

[santitrucco]

Hi at all !!!
What do you think.
How would be the performance for a midbass SBAcoustics or Scan Speak or Seas , in a back loaded horn , like need Fostex drivers ?

 

[GM]

The pioneers used and current prosound uses, mid bass BLH, just not in one like this as too much out of phase HF will be coming out of all those pretty curves.

GM

 

[ScottG]

-look to low Qe drivers.. doesn't really matter about the manufacturer (in this respect).

Ex.
https://www.parts-express.com/pedocs/specs/296-440-aurum-cantus-ac12050ck-specifications.pdf

Of course any horn should be designed for the particular driver. ..and in the case of a BLH that typically includes some measure of baffle-step support. IF however the driver has some lower-mid. gain (typically 150 - 300 Hz), then you have less to worry about (..or you could just go the route of baffle-step compensation).

additionally, lower Qm can lower the effect of the horn/(resonant t-line) on the driver and reduce non-linearity. (..this is a "tail-wagging-the-dog" effect, with the "dog" being the driver.)

 

[pelanj]

Hmm. This makes me wonder if 8PE21 in RCF H6000 front horn could be supported by a second horn in the back playing down to 150 Hz. Time for some Hornresp

 

[santitrucco]

Then , the frequency response would be irregular ?

 

[pelanj]

Actually, not too much. But a 135 Hz front loaded horn is of course much better. It would work somehow, I need to measure the 8PE21 with and without the H6000 horn. It is not intended for this application anyway, I just wonder if it would work somehow So the answer is it most probably would, but nothing to be excited about.

 

[ScottG]

..a 135 Hz front loaded horn is of course much better.

It's often about minimizing audible phase-delay; the lower in freq. for the rear-horn's contribution the better.