Performance Series 5.1/1990s L1.L5.L7/L100A
Many thanks for the excitable measurements You have given us with the instructive comments comprehended. Especially, I want to mention IM (inter-modulation) distortion that are not usually presented in the most of the other test data (even not in "GT-white papers").
Very interesting thread!
Today a stylish wooden cabinet with chrome plated accessories is more important than the natural sound. Lifestyle is the big topic...
But the 2nd biggest Sonus Faber "unfortunately" sounds really good... They went back to the old-fashioned Scan Speak drivers I also regard very much and use at home beside the JBL units. Nearly all worldwide well known high-end speaker companies produce their speakers in China.
Iīve seen EVERYTHING! Itīs important to keep the R&D, the heart of a speaker company, in the country where it was founded.
Otherwise we speaker guys will be unemployed very soon or have to do painstaking freelancer jobs across Asia...
Is any research documentation available about the acoustic pros and cons of the bi-radial horns and the older radial horns?
I really have problems with the broad on-axis dip of the radial horns... Linear efficiency or balanced acoustic power is something different.
For the beginning a lot of mentioned 'on-axis dip' can be find on Mr.Keele web site
http://www.xlrtechs.com/dbkeele.com/... Exp Horns.pdf
Iīll have a look.
Because they have slanted eyes!
Hey, relax...I'm Japanese so I'm allowed to say that.
why does JBL 4365 only rank 10th in Japanese eyes?
Gawd, are you guys still flogging that dolphin??
The whole point is that JBL 4-way monitors are popular to a limited but devoted group of fans -
they are not going to be huge sellers but should have solid sales over a long period of time.
2ch - Oppo981, JoLida502, JBL L200+, Von Schweikert VR-4
HT7- XDA-2, BDP93, B&K amps, Vandy 3A, 2Ce, VCC1, TF600 & JBL 4641
Sometime Google-translation can help, but looking at the figures from the presented data I can conclude:
- total harmonic distortion under about 100dB SPL is almost less then 1%, or around 1kHz even about 0.2%
- Inter-modulation distortion of about 5% is under 110dB SPL around 8kHz-octave
- Horn horizontal dispersion (as seen on the attached figure) , as I can understand the data, fluctuates from 4kHz to 14kHz ( about +/-30deg off-axis within +/-6dB region)
- vertical dispersion is very good +/-30deg
This "ultra wide" dispersion in the 3khz-10khz range, with the off-axis curves actually *above* the on-axis one, is also what I get with my H9800 clones (here with a 2435 driver)
No loudspeaker system even approaches real life so there is plenty of room for interpretation - Greg Timbers
Much better understanding of the off-axis response can be get if the responses are presented 'normalized' to 0-off-axis angle ( by subtraction in dB scale 0-off-axis angle response).
As an example Figures after 'normalization', and without any equalization and normalization. From the fist figure it can be concluded that almost +/-15deg off-axis angle can be get up to 20kHz (with the deviations less then +/-3dB), or +/-22degs up to 14kHz can be expected with +2/-6dB deviation , if (theoretically) on-axis response is 'ideally' equalized, while looking only the second figure such conclusion would be difficult to reach
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