This morning I was able to give a serious audition to all the USB cables I've being building for the past few weeks. And also evaluate the effects of the Olimex isolator in my main system.
For your reference, the system consists of an Apple MBP 15" (latest model - also used for work) -> DI (with PS) -> NFB-8 DAC (with TCXO) -> C-3 (Final Version) preamp -> C-10 amp -> Thor speakers (fat cabinet, 100 liters).
Interconnects are all cast using Canare DA202 cable.
The system is plugged into a Agd power filter through DIY power cords (unshielded braided design).
The computer USB output is set for 96KHz and 24 bit integer. The DI is set to pass through, and not over sample. Even with a Tent Labs clock, I found this arrangement to give a more detailed and spacious sonic presentation.
I used 3 test tracks for evaluation.
Julieta Venegas and Marisa Monte - Ilusión (Volume set to 27)
http://www.amazon.com/Julieta-Venegas-Mtv-Unplugged/dp/B0018OAPBQ/ref=sr_1_4?s=music&ie=UTF8&qid=1337630851&sr=1-4
Beethoven Symphony No. 9, 4th and 5th movements - Karajan + Berlin Philharmonic Orchestra (Volume set to 42)
http://www.amazon.com/Beethoven-Symphony-No-%7E-Karajan/dp/B000001GJR/ref=sr_1_13?s=music&ie=UTF8&qid=1337630952&sr=1-13
And, once in a while, I would listen to various arias from Handel's Giulio Cesare just to check my perception, but I didn't use it for all cables.
http://www.amazon.com/Handel-Giulio-Cesare-George-Frideric/dp/B000094HLD/ref=sr_1_3?s=music&ie=UTF8&qid=1337631152&sr=1-3
All observations without the Olimex isolator.
Monoprice USB
Natural presentation with a good midrange. A bit dry and lacking finesse. Not as fluid as the Canare cables. A little congested on top. Capable of resolving a great deal of information but not as involving or dynamic. A bit boring. Competent cable, an excellent value!
Presence: 7.5
Sound stage: 8
Choral goose bump factor: 7
Canare DA202 (Blue)
Very detailed and lush. Excellent definition. Brighter, more extended, and slightly faster than the other Canare cables. A little analytical on the top end, but with more air.
Presence: 8 Sound stage: 9
Choral goose bump factor: 9 (quite intense)
Canare L-2T2S (Orange)
More body than the DA202 but not as lush. Great micro detail and dynamic. Slightly dryer but more natural. Great texture and depth on strings. Cellos are very seductive and capable of goose bumps. This is a great cable to use as a USB connector. Very impressive!
Building this cable is not so easy though, things get very tight at the USB terminations...
Presence: 9
Sound stage: 9
Choral goose bump factor: 9.5 (amazing!)
Canare L-2E5 (Black)
Not as involving as the L-2T2S, but very close. I'd say 95% as good as the L-2T2S. Very natural with a big mid range full of detail. Well balanced and natural presentation.
Much easier to terminate than the L-2T2S due to the smaller gauge of the conductors.
Presence: 8.5
Sound stage: 8.5
Choral goose bump factor: 8.5
Canare L-2T2S with Olimex isolator
In my main system, somehow not as transparent or exciting! Goose bump factor went down. Robbed micro detail and slowed the system down. The sound is more "round", helping lesser recordings.
It does work very well on my (more modest) family A/V system which consist of a mac mini feeding an Agd Fun using a chip amp to drive Seas coaxial speakers. A very musical system. With the Olimex in place, the system acquired more presence with a bigger midrange. I'm keeping the Olimex there for now!
My first choice being the Canare L-2T2S! I'll have to build another for my family system... One could experiment mixing different cables for data and power sections. I might try different arrangements in the future, but I feel that the data section is the more significant in this scenario since the DI is being powered by its own power supply.
As a quick disclaimer, these are my subjective opinions, experimentation is key. Be very carefully if you're building your USB cables. Make sure you test the cable for continuity and short circuits. It's easy to make a mistake and damage a component.
The USB cables:
The system: