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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…Rerurn to Romy the Cat's Site