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The really strange thing is that my LCD-3's seem to have more bass than my LCD-2's
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That's the stange thing. My LCD-3's seem to have more mid bass kick than my LCD-2's. But then again they have a mid bass hump on the graph...
I have the opposite...
My LCD-2's were like that, with a mid bass bump, sort of a zig-zag with a cut in the sub-bass. Speaking
strictly of the bass response, and only from my first listening session with the LCD-3's last night, I can say the 2's had a bit more punch in the bass. The 3's certainly have more sub-bass. I was noticing sub-bass parts in music that jumped out at me. I didn't get that with the 2's. The 3's don't have as strong as punch, but the entire bass response seems more even and neutral.
It's hard to say if the 2's had that same sub-bass, maybe it was there, just masked by the hump in the mid bass? Both presentations are enjoyable, just different. Maybe also the thicker membrane on the 2's just are more efficient at moving bass notes. ?? hmm. Who knows. I do like the more even bass presentation of the LCD-3. I thought the bass on the 2's was a bit much at times. Between the LCD-2 carrying more weight in the bass (as I've read) plus that mid-bass bump...a bass-heads dream, though!
The graphs from my 2 pairs correlate with this....and the listening differences/observations are certainly real and noticeable. Not just an artifact of suggestion by seeing the charts first. Most LCD-2 charts I've seen are very flat through the bass, I hadn't seen a lot like mine with that zig-zag.
I don't put too much into the treble measurements on these charts, though. I read they are very susceptible to change due to headphone placement during testing, etc.
The LCD-2:
The LCD-3: