Nordost Blue Heaven interconnects and speaker cable, and D.H. Labs power cable. Check the used/demo list at Upscale Audio for a good deal on Nordost Blue Heaven speaker bi-wires (last time I looked.)
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I have a hard time justifying spending a lot of money on cable, PC and I/C just to improve this amp's "sparkle and transparency" (not that you need my justification). One of its biggest attractions for me is it's price/performance ratio. What I would do is some tube rolling. You can change the sound of this amp quite a bit by changing the small tube's and power tubes. You can play with new production tubes on the cheap or NOS. Call Kevin Deal and discuss w/him your what you want to do and see what tubes he would recommend. I would agree that changing your speaker cable to Nordost might help the high end, I'm just not sure how it will effect the bass.
I put in some NOS Tesla E34L's (power tubes) built in the late 80's/early 90's, but I haven't tried similar vintage Tesla EL34's yet, but from past experience I suspect they would sound much the same. That brightened my One up quite a bit. Added to that some EI 12AX7's almost made it too bright and I went back to the EH's (this is the only application for the EH's that I found that they sounded neutral - go figure!). You can also play with the 12AU7's as well - they do make some difference. I ended up using EI's. The permutation's are endless. I didn't care for the JJ 12AX7's or the JJ 12AU7's in this amp at all.
Rthomer, I am using a Shunyata Diamondback PC with my Prologue Two. Power Cords, in my experience have yielded greater results in my system than those of speaker cables & interconnects. I'd recommend starting with upgrading the stock PC on the unit.
Running a dedicated line, terminated with a high-quality outlet is also a very worthwhile 'tweak' that yields great results! (especially for the small cost)
Thanks for the input. Your right Newbee, the price/performance factor is amazing, and it outperforms my previous SS integrated at more than twice the price. But, just because it's inexpensive doesn't preclude spending some bucks to get more out of it, in fact it makes it easier ....but I appreciate and understand your point.
I am going to have to do some research on the tube rolling and consult with Kevin Deal..
I recently upgraded the stock cord of the Prologue I to Harmonic Technology Pro AC 11 and have experienced appreciably better sound. I have a spare Eichmann Express AC cord that will ultimately be used on a conditioner for my cdp, that I plan to try with the amp. I use the modest AH! Interconnect, which Kevin recommeded over the DH Labs.
I agree with Jh2os that installing a dedicated line would be a good starting point.