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In the Forum: Audio Discussions
In the Thread: The ULF cannel for my new listening room.
Post Subject: Back to the drawing board, the question is what is next?Posted by Romy the Cat on: 9/23/2018
Yesterday I spent most of the day to play with my IB, trying to make it to sound the way how I like.  I pretty much wanted to re-implement on analog level that surprisingly good result I got with digital crossover. So, I have built my along crossover with two cathode followers, the image above. It is the same Bessel 50 Hz and I turned it on I did not like the sound too much and measuring response nit was clear why. So, I was keep sweeping the room and keep adjusting the crossover, the midbass section and the rest of the things until I go very even response for both right and left channels. I can post the sweep, it is much better then the sweep I posted above.  Basically I went with ~ 35Hz crossover that begin to roll off before the room gains at 90Hz. As I sat to listen it is was kind of huge disappointment. The magic I got with digital crossover is completely gone. The sound is even but not “fantastic” as I got initially. I can write a whole book how good and magical it was with digital crossover but with analog crossover it was just too boring to describe it. Interesting that measurement-vise the response with analog filter is way better, however, bad response with digital filter does not bother me at all.


I feel that I got hit by phase, the digital filter run perfect Bessel and it was the key. Dima feel that I got hit by harmonics and tube filters has own harmonics that did not work in my case.  His theory is supported by the fact that I hear subjectively “right” sound at 50Hz digital and 35Hz analog. I do not think he is right and I believe I know that difference between harmonics and phase. Phase give magic, harmonics give comfort.


So, I need to experiment more, I will change the tubes and will get rid of the first buffer in my crossover. I would hate to learn that I need a phase precession of digital crossover to get my “magic” back. The Behringer’s lower bass is very bad and I would for sure will not be able to live with it. There are some projects out there that change the Behringer output stages that might presumably improve the lower bass but I personally have very little experience with it or trust to the people who play with digital crossovers. I need to admit however that the midbass with Behringer was very- very good…

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