John, I have an excellent relationship with an audio store that sells Foundation Research products. I managed to borrow 4 LC-1s and a LC-2 for my system. LC-1's for my Transport, DAC, Genesis Digital Lens and tube pre-amp, and a LC-2 for my tube amp. All of the in-line FR LC remained in the system for 2 weeks and then I started removing then one by one. It turned out that the FR LC-1s on my tube pre-amp and the CD transport did little to improve the sound. The most dramatic effect in order of magnitude was DAC, AMP, and Digital Lens. I mentioned to my audio dealer that I experience very little improvement by adding a LC-1 to my pre-amp, but since my tube pre-amp is very current hungry, he suggested that I try an LC-2, but he would consult with Ed Wolkow first. Please find listed Ed's response...
"The LC1 is most likely the best choice for your preamp. Even high-powered preamps tend to draw well under half of the LC1s capacity. However, you will probably get the most dramatic musical improvement by filtering the line to your power amplifier(s) first with the LC2. Most power amplifiers suffer from line noise much more than preamplifiers. Good preamplifiers (like yours) have well regulated supplies rendering greater noise immunity. I have often experienced that preamplifiers are usually the last step in the noise reduction process. It's a "weakest link in the chain" approach. The highest source of noise is usually the digital source and then the power amplifier. I would recommend that you prove my opinion with listening."
My listening tests concurred with Ed's recommendation. I have owned Tice, API (pre-Ultra) and PS 300 (pre-multiwave) and the FR products are the most musical. If you like a low noise floor with a dark silent back ground to allow the music a clean canvas to paint its sonic picture, then FR products are for you.