I miss my Loudness Button and Tone Controls....

So I recently upgraded my system to a Rogue Audio Sphinx integrated amplifier, V2.

Prior to this purchase I was using a NAD C162 preamp, and an Emotive UA-200 amplifier.

After a month of listening, I have to say, I miss the tone controls and the loudness feature on the old NAD pre-amp, especially when listening at lower volumes. The Rogue amp sounds great when played at a minimum of 50% of its output, but at lower volumes, it just seems flat. I do use a sub (SVS SB-2000 pro, and I'm using a very efficient speaker (Zu Audio DW's).

I've toyed with the idea of buying an EQ of some sort that has a bypass so that I can boost some of the frequencies when listening at lower volumes, and then bypass when I listening at higher volumes.

Any thoughts on this? Anyone experience anything similar? I'm about to pack and sell the Rogue amp, as the cons outweigh the pros for me.