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Don't tell Shaukat, Paul and Dave. . . . .LOL
Man, those are beautiful!
I do not run any kind of a house curve and find that a flat response in the bass to most realistically portray acoustic instruments such as a stand-up bass. I recently upgraded to a Holo Audio May dac and to their Serene preamp. The combination is truly holographic as I have never experienced. They simply sound real.
A house curve is a perceived flat response at the listening position. Understand how it can look like bass boost when you look at the house curve, but the slope starting at 20Hz is a -3dB/octave low pass filter. The graph you provided for your setup shows a house curve. The reason it appears flat is you likely used pink noise as the signal input and pink noise uses an approximate -1 to -3 dB/octave low pass filter (equal energy per octave). So we are talking the same thing. My bad, engineers like to use fancy language; should have stated “I DSP to a flat perceived response at the listening position”.Congrats on the D/A converter and preamp. Just checked them out on Holo Audio's website. They make beautiful looking gear. If they sound half as good as they look it should be amazing.
George and DaveWell done on your upgrades. Since coming back from the US in March, I am in the process of upgrading my apt. Work is in progress. Then need to make some re-arrangement of my speakers. I did get some new gear from USA such as a pair of nuprime evolution amps and the evolution dac as well as a Marchand crossover. I have yet to install them. Coming soon.Shaukat