I am
not so sure that a
flat response to 20kHZ is necessary. Some professional sound people like a gradually declining response from 12 or 15K to 20K.
See the URL below, go about 40% down the page, commence your reading with " Sound Pressure Measurements ":
http://www.vtaf.com/id107.html
And not to confuse the matter, I have owned / used 7-way speaker systems that measured out to
110 kHZ ( Fulton's P-12 Premiers ), but now run A7-800s at home..
There is one thing I am
very sure of, MOST SET amps do not play a good high end at all, in terms of energy with linearity. They almost all, mainly
only play a nice midrange. Their high end playback capability is largely " MIA ".
The high end deficiencies we hear from, say, a typical two-way ALTEC speaker system, IMHO, is STARTING right at the audio amp!
Its an AMP problem..... to start with.
The amp is not engineered and designed to play back music wide-band and linearly, energy-wise, in the lows
and in the highs.
The problem is compounded by subsequent choices made in amp to speaker wiring, botched crossover executions, and crossover-to-speaker wiring. This is all part of a un-thoughtfully executed audio chain. Amps are the biggest offender.
WE hear the speaker, and our listening room, as the LAST part of the chain, but the deficiency we notice, say in harpsichord playback, is
typically due to what is feeding the speaker, all those numerous botched / poor implementations that precede the speaker.
I think, in my own way of thinking, and
just my personal opinion, adding a super tweeter is much like putting lipstick on a pig, the wrong place to go.
Thanks for listening to MY opinion. Have fun, I sure do !!
Dowto1000