@mijostyn- If you're still using the TacT; have you upgraded the power supply? If not: get the highest (Watts) output supply that Mean Well now offers (I haven't kept up with their offerings, of late), replace the regulator with something better, like either Bellesons or NewClassDs and every electrolytic, with Sanyo OsCons.
The stock/OEM board:
https://www.mouser.com/ProductDetail/MEAN-WELL/PT-65B?qs=pqZ7J9Gt%2FmrUvp2%252BT2RNJA%3D%3D If you're using analog I/O boards; replace every one of the crappy, surface-mount, electrolytics, with Elna Silmic IIs and the regulators with the same as mentioned above.
The Elnas are considerably bigger than the surface mounts, so: you have to be creative, with SOME of the larger values' positioning, on the boards.
Parts Connexion has everything needed, to perform the above.
Getting the leads soldered to the tiny pads, left when removing the old caps, and you want them short as possible, as I did, is quite the chore.
Should you choose to undertake an upgrade, if your haven't already, I'd happily walk you through it.
This isn't just a, "trust me" issue! YOU WILL be amazed at the transformation, such an, "upgrade" (in this case: a VERY apropos term) makes.
" The Tact does not allow you to see the system's frequency response after correction."
I have a Behringer DEQ2496, left over from a pro installation and in a closet, that I use SOLELY (if you get my drift), for it's 1/3 octave Spectrum Analyzer. That works quite well, in conjunction with the afore mentioned test LP.
I use my ears from there.
Happy listening!