I'm not sure what things you would include in a "super-tweek" but when I added the Grand Prix Audio shelves to my system it went up a couple of notches.
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Speaker placement and judiciously positioned room treatments. The speaker placement is essentially a free tweak that just takes a good amount of time and patiance. Room treatments do not have to be expensive, but if you can hang them without wifely concerns there is little that can match the improvements that they will generate.
You put a PB 13 Ultra on a table? Must be one helluva table. That's a 120 lb. sub right?
I have the PB Ultra 13 cylinder sub. The best tweak wasn't really a tweak. It was $500 worth of bass traps in the corners of the room.
A nice tweak was putting sorbothane pucks that I already owned under that sucker. That snapped the bass to attention and it blends well with my "vintage" Martin Logans.
Experimenting with speaker/speakerstand interface.
Tried different top plates and mounting pad material and configurations on some speaker stands. Notes significant spund quality changes. Come to the conclusion/opinion that the difference can make speaker "a" prefered in SQ to previously comparable speaker "b". Speaker "b" owner would do zero speaker/speakerstand interface experimentation.
Stereophile - The Sound of Surprise (the loudspeaker/stand interface)
Solar Power? Does this mean all your gear is DC? Or do you use an inverter / battery setup?
If inverter / battery, what waveform does your inverter provide? I would be curious since most inverters are NOT true sine wave. How does some sensitive digital equipment sound with square or modified square wave current input?
Since this is a Super-tweak, the best I ever did was converting my Supratek Chenin preamp from 6SN7 tubes to 2C22/7193 tubes, with a constant current source on the plates and Cree SiC Schottky diodes on the cathodes for bias. An unbelievable improvement. In fact I still shake my head sometimes at the stunning clarity and realism.