Nice system, I have been wanting to add a Foreplay and DIO to my system for over a year now. I just never seem to make it happen. Bank for buck(from everything I've read) two very worthwhile investments. I have a mono tube-amp currently but it it not much use with ony one, I plan to get some stereo tubes soon to use with the very efficient Theater 4's(when I build them)Are your speaker cables silver wire?