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In the Forum: Horn-Loaded Speakers
In the Thread: Good midbass is complicated, if not unobtainable.
Post Subject: If I mayPosted by Gargoyle on: 12/23/2015
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 Romy the Cat wrote:
 Scott L wrote:
 the last time I checked, you were using 6each @ 10 inch low frequency drivers per side. That's "getting there" but still not enough to produce an acoustical watt. (which horns CAN do).
   
I am not sure what you mean. At the times when I used 6 driver line-arrays for sub 100Hz region it was integrated with 115Hz upper bass horn and I assure you that both integration and overall sound were very fine. I do not think that it would work in larger or non-sealed room however but it worked very well in there, I think it was ~300 sq feet. So, I do not know what you mean saying “not enough to produce an acoustical watt”.  In that room ANY design of midbass horn would be a disasters. 


My guess is was referring to the pressure levels at the surface of the woofer(s) compared to that of a horn. The sound pressure of a direct radiator has to be much high to achieve a certain SPL at the same distance of a lower pressure horn.

It is a phrase more commonly used in pro-sound circles. Typical direct radiator types are only capable of producing ~3 acoustical watts for every 100 electrical watts input.

One acoustical watt is ~107 db from an OMNIdirectional source.

I haven't done them math to see how your array compares, but I can surmise that Scott is suggesting that your particular implementation in that room was not up to the task of orchestra, which is considered to be ~1 acoustic watt in power. Probably OK for rock though.

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