Páleantology. By April 2nd, my external filter was done. Pál's measurements show a THD of 0.00072% and noise floor of -130dB. None of our amps match his figures. That filter would play sonically invisible.

Here we see the high- and low-pass slopes with the red vertical line marking the -6dB crossing at 40Hz. I was all set to cook up the sub stew downstairs. "I've upgraded the opamps to even better ones – the TI OPA1656." My Easter bunny had hidden quite the egg.

After a bit of reshuffling…

… this is how our two systems factored now.

Once the sound|kaos sub arrived, the Zu would migrate into the video system. Our spring hifi renovations were fully underway.