Here's what the Straightwire site says about these two cables:
"Symphony II: assists the presentation capabilities of better electronics.Its silky midrange and rich bass convey all the natural texture of vocals and instruments. Great for CD players!"
" Encore II utilizes the highest grade of foam insulation for astonishing midrange fidelity. Our most advanced Star-Quad design, Encore II outperforms all other cable designs in this price class and insures high compatibility with nearly all components. Discover the significant improvement a Level 3 cable can make with Encore II wired throughout your system."
Here's what was posted to describe the difference:
"I use the Encore II now for about 12 hours and the bass is improved but the mids and highs are not the same like the Symphony II Interconnects.
The Symphony II had more detailed mids and highs and they were more toned and stronge"
Re: break-in period- with low current voltage, what, exactly, is supposed to "break in"? It will either conduct, or not. We're not dealing with UHF frequencies here, it's somewhat less that 20Hz to somewhat higher than 20KHz. Any claims that they're flat to 100KHz are useless because that's too far above audibility to make a difference. I agree that limiting the response to 20KHz cuts off upper harmonics but if some sales brochure or salesman's description was the source of any expectations, it's not a valid test. This industry (all sales pitches, really) is full of "pre-selling" tactics when the results won't be measured.
I know someone who does development work in the automotive and marine industries for motors and electronics. Occasionally, someone from an oil additive company will show up and make all kinds of claims about how their product reduces frictional losses, etc. Funny thing- he asks for some samples so he can test it with a motor on one of his dynamometers and they never come back.
Sorry, but knowing which cable is being used makes the audition invalid.
I was appalled when I realized that I had a SoundQuest cable connecting my ReQuest music server to my integrated amp.
It sounds great with that one. Listen to the music, not the cables.