This past summer I sent my Odyssey Stratos Stereo back to Klaus for upgrades. He converted it to dual mono, which for Odyssey means two separate amplifiers in one case. Everything inside the case was replaced: upgraded pcb's, resistors, caps, new higher quality transformers, new internal wiring, and new WBT RCA inputs. The effect of this is more wpc and triple the peak current delivered, stated as 120 amps. Filter supply capacitance went from 120,000uf total to 240,000.
Upon receiving it I connected it to the HT front mains and ran music from the cable music channels for 12-16 hours a day to burn everything in. The power cords it came with are nothing special, so I used some that I built for some JBL powered PA speakers: two 14 awg power tool cords from Home Depot made with copper wire and molded ac plugs with brass prongs. I used budget IEC connectors on the equipment end.
I could hear the difference the new Dual mono made compared with the Carver TFM 42 that usually powers the mains: more slam, sweeter high end, more depth to the soundstage, stronger tighter bass, better imaging.
Next I put the 2 channel rig back together. I had taken it apart in order to construct some built in shelves in the LR. Again, the improvement was easy to hear: sweeter highs with more delicacy and a little more presence, more powerful bass and a fuller, more organic mid range. I was still using the diy PC's made for the JBL's. Overall I was satisfied that the improvements yielded by the new/rebuilt amp were cost effective.
I have a Chris Venhaus Flavor 4 PC that I was using with the stereo stratos, but since I need two PC?s for the dual mono I connected it to my pre amp and continued to use the ones made for the JBL?s. After a few weeks I decided to make another Flavor 4 and use both of them on the Dual Mono and make a Flavor 2 for the pre. The latter is identical to the F4, but with two 12 awg conductors twisted together instead of 4.
I put the PC's in the system and turned everything on last night. With the first note, literally, I could hear an astonishing improvement that I didn't really expect. Music was more effortless, not so much coming from the speakers as floating out into the room, similar to the effect I got when I first put my balanced isolation transformer into the system. The width of the soundstage was about the same as before, but it envelopes the listener a little better by wrapping around the sides, almost as if there are side speakers. The bass has more slam, instruments have slightly better decay and tone. The textures of instruments and vocals sound more realistic. Acoustic piano has more of the harmonics and decay of the notes that one hears when standing next to one being played.
It's a little difficult to find the words to describe what I?m hearing without repeating myself, so I'll end by saying if you haven't tried PC's made with good wire and connectors you owe it yourself to give it a try. The Flavor 4's can be made for around $190 each using Furutech connectors, depending on the length you need. The Flavor 2 for a little less. Of course you can use cheaper components, but I believe that the effect produced will be less.
As has been written here recently, everything matters!
FYI here is the VH Audio websit where I purchased everything: http://www.vhaudio.com/
Not affiliated in any way, except as a satisfied customer.
Next project: upgrade the PC for my DAC and CDP, all the connectors for the various power filtering devices.