Part (2)
Swapping 500 and 700 cables
First coin flip to determine which earspeakers: H=500, T=700
Result: T= 700
Part (3)
Second coin flip to determine which cable: H=500, T=700
Result: T= 700
SR-L700 Mk.2
Upper cable: L700Mk.2, faint gold/bronze dashed/solid markings Differences appear more discernable in second photo.
Lower cable: L500Mk.2, faint silver/gray dashed/solid markings
SR-L700 Mk.2 w/stock cable:
[The 700(2) fit more comfortably than the 300LE. Presentation is smoother, more transparent and coherent, overall, than the 300LE, with cleaner extension at either extremity. Leading edges are clean, but not as hard/crystalline-distinct as the 300LE. Transients and tonal decay sound more natural (less abbreviated) with the 700(2). In addition to a harder tonality, the 300LE do seem to produce a slightly wider and deeper sound stage.]
In general, I am happy with the 700(2) with stock Cu+SPC cable. Treble response is detailed and extended, but not sharp or strident to my ears. Midrange is clear and detailed. Bass lacks some thump/weight compared to the 300LE (and, to a lesser degree, the 500(2)), is fairly linear and extended, but a bit rolled off in the sub bass..
Part (4)
SR-L700 Mk.2 w/L500 Mk.2 cable:
To my ears, tones sound a bit more round, wet, full and dense. Soundstage loses dimensionality along all three axes (mostly along the vertical). Layering not as distinct. Grace Slick's vocals (on Lather, Triad) are more textured and natural-sounding. Treble not as extended, open/transparent. Cymbals don't sparkle/carry as much. Bass not as clean or extended.
Net gain: tonal realism (especially in the midrange). Net loss: transparency, verticality and frequency extension. I decidedly prefer the 700(2) with its (OFC + SPC) stock cable.
Will keep the 500(2) cable with the 700(2) for a while, and maybe bring the 300LE back online later.