Starting a new thread for comparison between 7a's and 7c's.
PR dustcap is smaller and cone is deeper than 7c.
Mid/PR baskets protrude on top of baffle.
Dull/recessed but smooth mid/highs.
Bass is smoother/softer than 7c.
Images better than 7c. It sounds right in the middle while 7c's are more directional to speaker location.
PR dustcap is bigger, cone is flatter than 7a.
Mid/PR baskets are recessed on the baffle level.
Bright, forward/sharp, more metallic mids/highs.
More chhik chhik sizzling highs sound in 7c's that are very recessed in 7a.
Bass is tighter, lower and punchier than 7a.
Also, much louder overall than 7a.
It's really interesting that in some songs I really like 7c's while in others, 7c's sounded very crowded and harsh.
'Hungry Heart' by Bruce Springston: 7c's sounded harsh crowded but 7a's are smooth and clear but in some other songs, 7a's sounded very dull while 7c's sounded perfect.
'Truly Madly Deeply' by Savage Garden: 7c's sounded very nice, strings/music all present while 7a's sounded very dull/veiled like sound coming from a hall with most of string instruments gone.
Really interesting is after listening 7a's a while then switching back to 7c's, it sounds like suddenly singer is screaming little bit as it's brighter and louder/tighter/punchier.
It's not only the tweeter that's different on these.
Even mids/bass is different.
7a's sound sad while 7c's sound romantic and happy.
I checked schematics and both versions use same crossover part values except the inductor (1.22mH vs 1.23 mH).
Even mids are same MW6502.
Looks like the peerless tweeter is swappable with SL2000 at least from the schematics of orginal 7 and revised 7.
7a's may really need re-cap to bring all the drivers to original specs.
Undecided as of first debate/comparison :).
Need more debate sessions to sway my vote one way or the other.
But I'm liking 7a's little better due to it's much better imaging than 7c's.
7a's disappear better than 7c's.
Perfect would be the combination of 7c's mids/bass andd 7a's tweeter.
Watched clips of action movies and 7c's are more dynamic, punchier, lower, thrilling and sometimes harsh at louder volume while 7a's are smoother not harsh but don't have that dynamic sizzling sounds. Also 7a's sound like hall sound.
I agree that depending upon songs and movie scenes, 7c's silver tweeter do sound metallic/harsh at louder volumes.