Hi,

I wanted to come back on a past thread about S4700 and S3900 : http://www.audioheritage.org/vbullet...ter-than-S4700

In this thread I read Dave complaining about the bottom end of these speakers…. I read 4313B writing “for ten grands or more I want it all, not 90% of the spectrum” (quoting from memory), and again regretting the L300’s woofers (136A or 2235h?) being at ease around 30Hz…. On another forum a 4367 buyer cut them at 80Hz (to avoid the port) and add a sub (or two)….some folks here have switch from 4365 to 4367 to get better low end response….(Mctwin if I am correct ?)…

So it seems that :
1 since JBL is japonese, the low end is not what it use to be
2 technical progresses are not questioned and the new woofers would be better in dynamic, SPL, and timber
3 as a result some people get use to the “new woofers sound”, others just don’t.

But reading the FRC of some of the new transducers, as far as I can understand it,the old school 2235H that is in my 4430 (and was replacement for the 136A in the L300) starts to go down at 2800 Hz!, and is (classically) at -10dB at 30 Hz from what it was at 2800Hz…. Ok but the SPL at 30Hz is only 84dB…..(starting thus from 94dB at 2800 Hz) (still better than the LE14H3 which is at 82dB at 30Hz)
Whereas, say the 2216Nd, starts to go down at 200 Hz and is at -10dB at 30Hz, same…. Except that the SPL at 30Hz is 105dB and not 84dB…. And 1501AL 1 and 2 are even better (starting to go down at 150 Hz, and finishing for the 1 at an astonishing 106 dB at 30 Hz!

So here are my questions:
Can someone explain me:
How much tehcnological progress have been made between the 2235H and the 2216Nd or 1501 AL ?
What are the results in terms of sound ?
Why, provided that one do not need a 115 dB sensitivity speaker , one do not equilize the new woofers at say 100 dB (or less!)…. As it would go flat till 20 Hz ….?