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In the Forum: Horn-Loaded Speakers
In the Thread: Good midbass is complicated, if not unobtainable.
Post Subject: Pretty darn closePosted by Scott L on: 12/23/2015
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 Gargoyle wrote:
 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.


Romy's bass driver array is actually a very good approach. 6 x10's per side is actually enough to produce an acoustical watt at the upper part of the range they cover, but not down to the subterranean depths of an orchestra's hall ambiance. I did not realize his former room in the basement apartment was as small as it evidently was. What about now, though ?    Actually, the point of my post was illustrate the acoustical needs for proper integration of the two types of systems. Also let me add here, I feel for domestic settings, this approach makes the most sense from a practical viewpoint.

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