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Romy wrote :

"...It is most likely that you changing the yours crossover to 4800Hz introduced a phase shift that accidentally “clicked” with the neighboring channels...You might look at the differences in imaging since you changed the crossover..."

Hmm, interesting... The horns are not yet properly located (frames under construction)... in fact they are only sort of close, and at this stage, the L and R channels are not really symmetrical, so I tend to not focus on imaging; even so, I have not noted any differences in imaging with the new arrangement.

Here are some specific observations made with the 400Hz horn high-passed higher up (at 4800, versus 3200Hz):

1) I now use a higher volume setting on the preamp

2) "Cringe factor" has gone down... This simply means that I don't find myself reaching for the volume knob to turn down violin, horn, and upper range vocals passages which are less than absolutely perfectly recorded

3) Due to the higher volume setting, for what seems like the same mid-range output, there is now more output from the bass drivers

4) Overall the sound is now less thin and I would say "warmer"

As you have mentioned in the past, and as I have confirmed with RTA, the 400Hz horn, when high-passed at 3200Hz, is good acoustically down to about 1kHz. I now need to measure the output from the 180Hz horn, but in its current band-passed configuration (790-3200Hz), it will certainly produce sound well above 1KHz, the point where the 400Hz horn was coming on. I was for sure getting ouput from both horns in the 1-3k range, and it is possible that the 180Hz horn alone produces better results in this range (say 1KHz-2KHz) than if accompanied by the 400Hz horn.

As you pointed out, moving the high-pass point up from 3200 to 4800 is only a 1600Hz difference, but what if we look at it in terms of octaves we are asking the S2 to reproduce:

High-passing at 3200 means the S2 in the 400Hz horn will be asked to handle a full two octaves (electronically) :
Octave 1 : 3200 + 3200 = 6400, and Octave 2: 6400 + 6400 = 12800 (where a good S2 will naturally roll off)

High-passing at 4800 means the S2 in the 400Hz horn will be asked to handle only one octave (electronically) :
4800 + 4800 = 9600, plus a bit more above that, until natural roll off of the S2

I'm not sure that means much... I will try to take some measurements soon.

jd*

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