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For a casual observer it might appear that I am constantly fought with my ULF, finding and loosing better and worse configurations.  It might be so but I have a very strong sense of objective of what I would like to accomplish. I want to reinstate that Sound in my room what I was injecting +20dB at sub 20Hz in my room. However, I would like to do it in a way that under any circumstances would smear my midbass.

Ironically to raise the order of ULF filter and to add volume does not work. It has to be, for some reasons, 18dB per octave and the key is to control the slop of that roll of. This is what I will be experimenting now, I know that I will find the solution as I have very strong visualization of what I need to get as the result.

I have much option on the table. The DSP is one of them. I have Velodyne SMS-1 and I need to do the action only on one channel, so I might use it. I have another digital parametric EQ that I might use. I might implement notch filter and correct the slope’ bump. (Here is a homework for you: why I religiously against notch filters but feel that it will work fine in my case). There is a few other options, I will examine them.

Actually the bigger question to me is why I like the Sound after my tube active crossover more than with line-level passive filter. The ULF IS better quality with line-level passive filter – I can testify it. But the ULF after the 4 stages of active tube filter make the ULF to sound that same as it come from the rest of the system – lash, measured and super polite. It does not have that thrilling ULF slam but it does not exist in real life ad well and I am trying to run as far from it as I can.  The ULF after that tube crossover is very pleasurable and listening I would quests that I have SS amp doing bass.  In way the tube crossover as my SS Yamaha B2 amp make the ULF amp to sound more similar to Milq. I personally feel that it has to do with characteristic distortions of 12AX4 in tube crossover – I happened to LOVE it in my “End of the Life Phonostage”. It will be VERY funny if I decide to stay with this tube active crossover as final version.

For now, after a few day of listening with line-level passing I voluntary took it off and switched to tube active. It gives me a feeling as I am sitting at the table and do something and somebody performs a foot massage on me…  I am listening now the live broadcast from Symphony Hall with full production of Berlioz‘s Roméo et Juliette, Charles Dutoit leads BSO and Tanglewood Festival Chorus. I did not have time to calibrate my active crosier and set it up by pure intuition. I know that upperbass a bit eaten by my phase bitterly on right channel but the whole sound of the Symphony Hall is amazing.  With this ULF injection the whole room is breathing with sounds and I have absolutely no feelings of bass excessiveness. Just wonderful! I raise my glass to Karl Leonhard!

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