GoodSoundClub - Romy the Cat's Audio Site

In the Forum: Horn-Loaded Speakers
In the Thread: Macondo’s lowest channel.

Post Subject: Hm, there is no way to escape the 4th order.Posted by Romy the Cat on: 5/6/2011

After much listening and measuring I convinced myself that there is no way for me to escape the use of the 24dB per octave slope if I want to keep the sound of my midbass horn not violated. I also have to admit that I will not be able to render 4th order filter at line level passive. So, I will be building the 4th order ULF low pas filter for my modified Marchand unit and probably will be looking ways to further improved the sound of that crossover.

I have to say that even I do like how the sound of my filter with Marchand gets integrated in with the entire Macondo sound but I do not like conceptually that to write my ULF filter I need 4 active stages, particularly with low current tubes like 12A7 used and cathode followers. Funny, I do like sound (it sound in a way like Ear phonostage) but I do not like it as design idea. It is not to mention that I sometime keep my ULF all time on and to have tubes running all time does not make me too comfortable. I would need more elegant solution for the 24dB crossover or need to find a way to stick it somehow inside the power amp between the stages. It is bad that I do not know SS amps and can’t not do it myself. Are any person would like to get a small job to do it for me?

Rgs, Romy the Cat

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