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RE: Bull-Nosed Horn Project

Posted by djk (M) on October 14, 2014 at 00:57:53

In Reply to: RE: Bull-Nosed Horn Project posted by Mr_Steady on October 13, 2014 at 17:01:26:

"From what I've read about the PPSL they don't change the already present odd order harmonics."

For the most part.

The low-pass action of the plenum will roll-off higher harmonics at about 12dB/oct, so with careful design you can get some reduction in 3rd (and higher) harmonics at the cost of bandwidth.

"The third may be more prominent because the second is reduced, and then only when the bin is "pushed hard." "

In practice, no.

What does happen is it sounds fine up until the amplifier clips and then the 3rd sticks out like a sore thumb as it goes straight up from the clipping. If of brief duration in live music it seems to be a non-issue, with RAP and its steady drone notes it can sound horrible (use an amp wih a clip-limiter).

"I'm guessing that the PPSL would be less directional?"

At low frequencies, yes.

The Di at higher frequencies increases as much as 3dB as the radiation changes from 2Pi to 1Pi as controlled by the width of the front panel (around 200hz usually).

"What is the difference between four 8", two 12", and two 15" drivers? Just the low cutoff?"

Pretty much.

The quad driver set-up looks way cool, and usually gets "WTF is that" remarks.

"I noticed in your link that you had the bottom vent on the side."

Whatever works the best for you, cosmetics, etc.

"I congratulate you on your excellent work. It may turn out to be a giant horn killer."

Thanks, I don't build bass horns anymore, just mid-bass/midrange and HF horns.

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