low-mid horn speaker compression ratio
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 16th March 2020, 04:55 PM #1 Cracky diyAudio Member   Join Date: Mar 2020 low-mid horn speaker compression ratio Hi, me and my friends are trying to construct a horn speaker, with a bandwidth of 90-500 Hz. We chose to base our design on the B&C 12FW76 driver. We were surprised, that our calculations gave a compression ratio of about 1:4.88. I used the following equations to calculate the throat area: efficiency = Fs / (Fch * Qes) St = efficiency * Re * density_of_air * c * Sd^2 / ((1 - efficiency) * Bl^2) where: St := throat area Fch := upper cutoff frequency (500 Hz) The other parameters are the Thiele-Small-Parameters of the driver and physical constants. Are my equations wrong or do you think this is a reasonable compression ratio? Can a high compression ratio damage the driver? Thanks and have a nice day everyone.
 16th March 2020, 11:07 PM #2 kipman725   diyAudio Member     Join Date: Jun 2007 Location: Warrington In my notes I have St = (P0)*C*R*Sd^2 / (Bl)^2 P0 = 1.21 kg/m^3 C = 343 m/s I designed a very similar horn using a 15" driver and got a compression ratio of 1:2.523: Mega midbass straight horn 139dB I think your aiming for a specific upper cut off frequency though while I was aiming for the widest possible bandwidth. If you want to cut the horn off at 500 Hz you could add in the a throat chamber. I recommend simulating in Hornresp, you will quickly see if your sums are correct! __________________ CHR-70+Subs (2011?). ART CLEANBox Pro Low freq modification. 3 way, MEH, PA tops. Isobaric reflex 30Hz subs. Quiet PA AMPS?

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