drop me a line how the enclosure fits … BTW nice weather ;-D
EDIT: Just heard your demo… the low end kicks ass even as mp3, hard times for any moogish base. Why did DBX this Subharmonic Syntheziser Thingy??? (At this point you may see me rearange my FX-Rack to free some space…)
The Shruthi has a larger audio range (deeper in the bass and brighter in the high-end) for several reasons:
I increased the value of all the AC-coupling caps, resulting in less high-pass filtering in the audio path. Such high values (4.7uF) are a bit uncommon, but the SMR-4 and CEM3379 filter circuits are not very prone to DC-offset and CV bleedthrough problems (this will be a different story with the SSM2044 filter board, where I had to make a difficult compromise).
The audio is generated at 39kHz instead of 31.25kHz, so that’s 4 extra kHz of bandwidth to carry the higher-order harmonics that can make the sound shine. With cutoff wide open, a sawtooth wave will saw through the wood of your monitors
On the Shruti, there was no calibration of the cutoff range, so even when wide-open, the filter was still attenuating the frequencies above 12 ou 13 kHz (actually, because 5% resistors were used, this might vary by +/- 2kHz!). On all the Shruthi-1 boards, there are trimmers for the cutoff range so you can tune it in such a way that “127” means “no filtering in the audible range”.