Acoustic Horn Design – The Easy Way (Ath4)

[mabat]

I've never seen that. Could you send me the whole file?

[jcarothers]

Originally Posted by mabat

I've never seen that. Could you send me the whole file?

Sure, attached.

[mabat]

I'll check that later, just one thing I see right now - be sure to add "Source.Velocity = 2", otherwise you model quite a different thing:

[mabat]

You need this:

[Patrick Bateman]

Originally Posted by Dkalsi

Lastly - and I know this is going to sound ridiculous - but I'm going to add that even the frequency sweeps used to measure the horn sounded quite pleasing. I hate taking the measurements, especially of compression drivers. But I've taken measurements of the drivers on QSC clone waveguide, SEOS waveguide, and the Wayne Pi waveguides - and this horn was the most bearable of them all. Anyways ---- let's get back to objective data :-).

I've probably done a thousand measurements of various projects. And the moment I hear that pink noise sweep, I know if it's good or not.

It's such a bummer when I work on something all weekend, do that first measurement in REW, and before the measurement even appears on screen, you can tell if it's good just by the sound of the sweep.

[Dkalsi]

Here are additional normalized measurements (to isolate horn performance), with a slightly better-printed horn (same Peerless driver).

Thanks

[mabat]

Thanks again. I think that better would be to normalize to 10°. If you look at the sim (#4969), just above 5 kHz there is a slight ripple on-axis. If normalized to 0° this ripple will show in all the other polars instead - that's not describing the overall behaviour very well. I know it's always difficult with normalization. Maybe you could simply show the raw data as well.

[Dkalsi]

Sure, Matab.

See additional pics. Now normalized to 10 degrees, and raw.

Again - the two sides have not yet be glued - just taped together.

[mabat]

Great. Do you know the details of the exit section of the driver used (angle and depth of the last conical section)?

[JSS]

I'm ready to print the ST260, just want to make sure. Is 30% infill good enough?