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In the Forum: Horn-Loaded Speakers
In the Thread: Mid-bass Hornresp (V51.30) simulations
Post Subject: Sometimes SPL is just SPL ...Posted by Romy the Cat on: 7/4/2021
 koh123 wrote:
Upon reflection I forgot that we ultimately listen to the sound produced and not the beautiful computer simulated SPL profile.  So I went back to old school thinking and re-generated the mid-bass tractrix horn with the mouth circumference being one wavelength in size at the cut off frequency.  The resulting SPL profile was still the same as before.  Now that's the SPL profile, not the actual sound. 

Yes, it is correct. The horns generally and sub 100Hz horn in particular reposing very strange to SPL profile. You might perfectly have two horns with identical RTA scans but with very different sounds. I can give you a laundry list of parameters that HORNRESP or any other prediction some would not even consider. As far as I concern the HORNRESP help you to get only your lower cut off, so any simplistic spreadsheet that compare mouth diameter, throat diameter and length of the horn that would encode the horn profile. With proper implementation any profile and any horn will work, the key is to make all the rest properly. I generally advocate idea horns with 35-40” mouth diameter as it gives some flexibility for architect ring your hone stock for sitting listening position. Still, I feel that energetic characteristics of horn loading( amplification, drivers, electrical damping via amp and mechanical damping via back chamber) has even more prominences then pure SPL response.

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