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I spend quite a few hours playing with the new channel trying to ingrate into Macondo but so far not successful.

Since the new channel and the Macondo upperbass horn have identical sensitively and identical impedance I figured that I would drive it from the same amplifier for a time being and now the new channel uses the same Super Melquiades upper bass amplifier and the upperbass horn. The crossovering is very elegant. The amplifier produces now from 50Hz to 800Hz, first order. The upperbass hors kicks-in with no filters at 100Hz and begin to roll off at 800Hz die to the amps roll off. The new channel is in parallel and sites behind one high-pass cap, picking up from ~600Hz -700Hz and dies out at ~1200Hz, since it works after 800Hz along with upperbass horn and gain 3dB. The response is fairly smooth and everything is very “cool”. What is not cool that it sounds like crap!

First thing first: the new channel honks. It does not honk when it runs stand alone, at least I was not able to detect it, but being incorporated into Macondo it screw up sound with ordinary old fashion, disgusting honk. There are many reasons of horns honking but usually it happens due to use of excessively low crossover point. I was lifting up the crossover to 1250Hz and it kills the honk but at the same time it killed the purpose of this horn. The only solution that I see in here is going for second order 500Hz -800Hz. It is what I will be trying next.

The second thing is an absolute mystic to me. The upperbass channel and the new channel crossed at 1000Hz do not sum but subtract amplitude at the listing position. Of could they are in-phase, and I checked it 32309756 times. But my RTA shows absolutely unambiguous that if the channels in-phase then the amplitude tanks but if I put the channels out-of-phase then I gain 3dB at crossover point, as I should in-phase. I have absolutely no explanation at this pint why it is so.

To be continuing…
Romy the caT

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