David,
You are EXACTLY in the same boat that I was on some months ago. And all I can suggest you is to get a Promitheus TVC. I am sure your NAD will sound much more better than the Exposure you are using. I am using a Reference C-Core version with my NAD C352 (http://www.promitheusaudio.com/frontpage.html). You might get a used Promitheus on Audiogon for much less. Your NAD has great input sensitivity 630mV, which will work superbly with the Promitheus TVC.
What is the rest of your system?
You are EXACTLY in the same boat that I was on some months ago. And all I can suggest you is to get a Promitheus TVC. I am sure your NAD will sound much more better than the Exposure you are using. I am using a Reference C-Core version with my NAD C352 (http://www.promitheusaudio.com/frontpage.html). You might get a used Promitheus on Audiogon for much less. Your NAD has great input sensitivity 630mV, which will work superbly with the Promitheus TVC.
What is the rest of your system?