Output impedance usually is correctly specified in the manuals but the freequency range sometimes isn't or if even specified the levels usually hidden.
Preamp might be at fault of not having "full-enough" range and needs either internal upgrade or replacement.
I'd increase negative feedback or introduced the global feedback if one is absent in the amp. Also I'd replace stock volume control on alps pots.
For a replacement I'd look for Audio Research older units that are far more superior than L1.
Preamp might be at fault of not having "full-enough" range and needs either internal upgrade or replacement.
I'd increase negative feedback or introduced the global feedback if one is absent in the amp. Also I'd replace stock volume control on alps pots.
For a replacement I'd look for Audio Research older units that are far more superior than L1.