I agree that amp is a keeper. Also agree an active preamp would be the component to add for a change in dynamics and detail.
Are your speakers resting on the floor? To get faster, tighter bass, they need to be on footers or spikes.
The best way to lower the noise floor is to address your power situation. Install a dedicated AC line from your circuit box (if possible). A good power conditioner can significantly lower the noise floor; a passive unit can be had for under $500. Only your low-current components should be plugged into it, the amp should remain plugged into the wall for best results.
And having your computer on the same AC line as your components is adding noise to your system. Typically 2 lines are used, one for analogue and a separate line for digital.
Are your speakers resting on the floor? To get faster, tighter bass, they need to be on footers or spikes.
The best way to lower the noise floor is to address your power situation. Install a dedicated AC line from your circuit box (if possible). A good power conditioner can significantly lower the noise floor; a passive unit can be had for under $500. Only your low-current components should be plugged into it, the amp should remain plugged into the wall for best results.
And having your computer on the same AC line as your components is adding noise to your system. Typically 2 lines are used, one for analogue and a separate line for digital.