Looking to upgrade my towers

You'll hear a big difference even if you get a cheap one. Of course you can spend more money and get one that sounds better, but the main thing is to get the HT processor out of the signal path. I have one made by Channel Island Audio that would be fine. It sells for $200-$300 if I remember correctly. Creek also makes a good one.

If you've ever wanted to try something like an AQ Dragonfly, that will work as well. It sells for $100 and you can use it with a computer, tablet or smart phone. You would run a cable from the DF directly to an input on your amp. Best Buy sells them, so can always return it if it doesn't work out.

Hey cool. Thanks sfall. 

If you want too keep the budget low for a passive, the Schiit Sys is a good option. It's basically a source selector switch with a volume control, just like most other passive preamp and does it well. It doesn't add or remove anything in the audio path as long as you don't need to run real long interconnects. All for $50.

Perfect! Thats what I'll try. Any idea where one can be brought from? 

You can buy it direct from their website - unless you want to try to find one preowned. I'm not good with hyperlinks,but, schiit.com will get you there.

I have a multibit dac from them and like it. 

Regards
gary