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In the Forum: Horn-Loaded Speakers
In the Thread: Jessie Dazzle Project
Post Subject: Meanwhile, back at the lab...Posted by jessie.dazzle on: 7/8/2008
Well a scepter or a baton... Last night before setting up the RTA, I listened to a recording of orchestral works from Strauss (Kempe conducting)... It was early enough that I could "air out the system" a bit.
And Ok, maybe I don't have all the filters dialed in, and the DPOLS are like a dream to me now, nevertheless, the quality of life these horns convey is just fantastic, especially with this sort of music/recording/volume level. Romy sometimes writes that he stands in front of his system and conducts... I am absolutely certain he is serious.
Meanwhile...
Here is an RTA plot of both the upper and lower mid horns, as they are currently set up (meaning without having affected any changes to the filters):
The numbers may be too small to read, so I'll just point out that handoff is centered around 2400Hz.
As Romy says, the 400Hz horn is relatively falt down to 1KHz. The 180Hz horn also runs way below its electrical filter cutoff, and keeps getting stronger the lower it goes, before finally dropping off.
If I were to add a plot of the upper bass horn (115Hz tractrix) it would show bass output that continues to rise down to about 140Hz (below that I run out of horns and let the lower-bass enclosures take over, which is not kosher, but it is temporary... Until I get the 45Hz mid-bass horns done).
So, a curve drawn by the entire system drops as frequencies rise; it is possible that it drops too steeply.
The question I have today however is the following :
Is the output from the 180Hz horn too strong, and should that red line drop down under the blue one sooner? It is worth bearing in mind that I would not like to give up output at around 500Hz, because it is necessary to make the transition down to the upper-bass horn (which as stated above, has even stronger output... BTW, that's when using the Fane Studio 8Ms... More on that later).
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