midrange horn design?

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#21
GM,

thanks. what is happening with the black and grey curve on your picture? for example, this is what i see when i simulate the 12TH50_midhorn:
1719653928260.png

it does not look like your graph
 
#24
It can be square or rectangular, just needs to be expanding from the throat. Yes or I wouldn't have posted it. 😉 Yes, the dip isn't nearly as bad as HR predicts, but our hearing acuity isn't good enough even if it was and the 3-400 Hz dip is < +/- 3 dB which again won't be this bad in reality + is most folks threshold, so likely won't be an audible issue.

Note too that virtually all horn designs benefit from 'critically' damping its terminus to quell reflections back to the throat like at ~1 kHz, modulating the driver unless heavily rounded over or at least has a 'flip out' like the B&C horn except it needs to be greater for best performance. I ran out of time to sim this version.
 
#26
Faital FH500 is already quite efficient. It is not suitable for horn loading. I wished I had seen this thread earlier. Look at this spec sheet, what does it say?
 
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#28
It's for you to decide. All I can do here is share my experiences. A 12 inch unit is too massive to do a proper MID RANGE horn. By this, I mean ALL the mid-range. 250-5k Hz. If this can be accomplished, it's easier to blend in a tweeter. At a 1.2K crossover to a lower mid horn, it's next to impossible to integrate a compression driver/horn combo because of the disparity in distance that the physicals of the devices dictate. I know that some installations do this anyway, but a rather distant listening position is required. Like 18-25 feet. (or 6-9 meters) You stated that you had four (4) units of the 12FH500. You can do an MTM with a 90x40 horn between the 12's. This should give you 100+ db/watt, depending upon how the baffle step is addressed. AND, you will be forever in time, developing a crossover. The other problem with an MTM is the tweeter height should be at ear level for best results, but you said you wanted to stack the mid/high on top ? All speaker systems are compromises; you have to prioritize what is most important for you.
 
#29
i already got drivers: https://audio55.se/sv/products/tw-75
with a horn looking like this:

1719781052357.png

i am going to put the speakers on a truck bed like this:

1719781175496.png

there will be multiple trucks like this driving around with people watching from the streets. note that some trucks have up to 140cm of walls around the bed, way higher than the one on this picture
there will be ~30 people on the truck. preferably i would make a square midrange 4*12 box and add a "driver box" on top of that one. that way, i could angle the drivers outwards 45 degrees

i will put them on top of four SS15 boxes yep
 
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#31
HickeHiskelig said:
do you think i should ditch this idea?
Click to expand...
With my max efficiency design out to 2 kHz, most definitely unless you're happy at ~ 1.0 W power handling due to a 22.47x ! 😱 compression ratio (CR). Hover the pointer over 'S1' or 'Sd' to see it down in the bottom bar. For more power open up to a 2:1 max CR with its 'quicker' HF rolloff.
 
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