What is more important ? Need some advice.

I'm running Wadia 301 direct to PS HCA-2 with AU-24 XLR and use P-500 for clean power. For personal reasons, I can't listen to 301 anymore at the recommended volume level, I listen mostly at night with low volume. This is with reducing the voltage level on 301 to the lowest level.

According to 301 manual, use recommended volume level for critical listening. It maintains high resolution even at lowest volume control settings. Do they mean actual volume or output voltage level ?

I don't have space to buy a pre-amp and solve the low volume problem. If I sell P-500 pwr regen, I can make room and buy a pre-amp. I need advice, what is more important, clean power or lose some resolution ?