JBL Master Reference Monitor

[4313B]

Allegedly all the graphs are in this thread somewhere. Here is the data.

Object(9.35.1): Ch1 Input EQ Filters

Enable 1 = 0	Frequency 1 = 1kHz	Q 1 = 4	Slope 1 = 6	Gain 1 = 0dB	Type 1 = Parametric EQ
Enable 2 = 0	Frequency 2 = 1kHz	Q 2 = 4	Slope 2 = 6	Gain 2 = 0dB	Type 2 = Parametric EQ
Enable 3 = 0	Frequency 3 = 1kHz	Q 3 = 4	Slope 3 = 6	Gain 3 = 0dB	Type 3 = Parametric EQ
Enable 4 = 0	Frequency 4 = 1kHz	Q 4 = 4	Slope 4 = 6	Gain 4 = 0dB	Type 4 = Parametric EQ
Enable 5 = 0	Frequency 5 = 1kHz	Q 5 = 4	Slope 5 = 6	Gain 5 = 0dB	Type 5 = Parametric EQ
Enable 6 = 0	Frequency 6 = 1kHz	Q 6 = 4	Slope 6 = 6	Gain 6 = 0dB	Type 6 = Parametric EQ
Enable 7 = 0	Frequency 7 = 1kHz	Q 7 = 4	Slope 7 = 6	Gain 7 = 0dB	Type 7 = Parametric EQ
Enable 8 = 0	Frequency 8 = 1kHz	Q 8 = 4	Slope 8 = 6	Gain 8 = 0dB	Type 8 = Parametric EQ
Enable 9 = 1	Frequency 9 = 500Hz	Q 9 = 5.26	Slope 9 = 6	Gain 9 = 1.1dB	Type 9 = Parametric EQ
Enable 10 = 1	Frequency 10 = 900Hz	Q 10 = 4.38	Slope 10 = 6	Gain 10 = 1.6dB	Type 10 = Parametric EQ
Enable 11 = 1	Frequency 11 = 1.15kHz	Q 11 = 7.43	Slope 11 = 6	Gain 11 = 1.4dB	Type 11 = Parametric EQ
Enable 12 = 1	Frequency 12 = 1.6kHz	Q 12 = 3.13	Slope 12 = 6	Gain 12 = -0.9dB	Type 12 = Parametric EQ
Enable 13 = 1	Frequency 13 = 2.54kHz	Q 13 = 9.72	Slope 13 = 6	Gain 13 = -1.1dB	Type 13 = Parametric EQ
Enable 14 = 1	Frequency 14 = 3.25kHz	Q 14 = 7.07	Slope 14 = 6	Gain 14 = 1.3dB	Type 14 = Parametric EQ
Enable 15 = 0	Frequency 15 = 1kHz	Q 15 = 4	Slope 15 = 6	Gain 15 = 0dB	Type 15 = Parametric EQ
Enable 16 = 0	Frequency 16 = 1kHz	Q 16 = 4	Slope 16 = 6	Gain 16 = 0dB	Type 16 = Parametric EQ
Bypass 1 Thru 8 = 0	Bypass 9 Thru 16 = 0

Object(9.35.2): Ch2 Input EQ Filters

Enable 1 = 0	Frequency 1 = 1kHz	Q 1 = 4	Slope 1 = 6	Gain 1 = 0dB	Type 1 = Parametric EQ
Enable 2 = 0	Frequency 2 = 1kHz	Q 2 = 4	Slope 2 = 6	Gain 2 = 0dB	Type 2 = Parametric EQ
Enable 3 = 0	Frequency 3 = 1kHz	Q 3 = 4	Slope 3 = 6	Gain 3 = 0dB	Type 3 = Parametric EQ
Enable 4 = 0	Frequency 4 = 1kHz	Q 4 = 4	Slope 4 = 6	Gain 4 = 0dB	Type 4 = Parametric EQ
Enable 5 = 0	Frequency 5 = 1kHz	Q 5 = 4	Slope 5 = 6	Gain 5 = 0dB	Type 5 = Parametric EQ
Enable 6 = 0	Frequency 6 = 1kHz	Q 6 = 4	Slope 6 = 6	Gain 6 = 0dB	Type 6 = Parametric EQ
Enable 7 = 0	Frequency 7 = 1kHz	Q 7 = 4	Slope 7 = 6	Gain 7 = 0dB	Type 7 = Parametric EQ
Enable 8 = 0	Frequency 8 = 1kHz	Q 8 = 4	Slope 8 = 6	Gain 8 = 0dB	Type 8 = Parametric EQ
Enable 9 = 0	Frequency 9 = 1kHz	Q 9 = 4	Slope 9 = 6	Gain 9 = 0dB	Type 9 = Parametric EQ
Enable 10 = 0	Frequency 10 = 1kHz	Q 10 = 4	Slope 10 = 6	Gain 10 = 0dB	Type 10 = Parametric EQ
Enable 11 = 0	Frequency 11 = 1kHz	Q 11 = 4	Slope 11 = 6	Gain 11 = 0dB	Type 11 = Parametric EQ
Enable 12 = 0	Frequency 12 = 1kHz	Q 12 = 4	Slope 12 = 6	Gain 12 = 0dB	Type 12 = Parametric EQ
Enable 13 = 0	Frequency 13 = 1kHz	Q 13 = 4	Slope 13 = 6	Gain 13 = 0dB	Type 13 = Parametric EQ
Enable 14 = 0	Frequency 14 = 1kHz	Q 14 = 4	Slope 14 = 6	Gain 14 = 0dB	Type 14 = Parametric EQ
Enable 15 = 0	Frequency 15 = 1kHz	Q 15 = 4	Slope 15 = 6	Gain 15 = 0dB	Type 15 = Parametric EQ
Enable 16 = 0	Frequency 16 = 1kHz	Q 16 = 4	Slope 16 = 6	Gain 16 = 0dB	Type 16 = Parametric EQ
Bypass 1 Thru 8 = 0	Bypass 9 Thru 16 = 0

Object(10.36.1): Ch1 IIR Crossover Filters

Highpass Enable = 1

Highpass Frequency = 782Hz

Highpass Type = Butterworth 6dB/oct

Lowpass Enable = 0

Lowpass Frequency = 500Hz

Lowpass Type = Linkwitz-Riley 24dB/oct

Object(10.36.2): Ch2 IIR Crossover Filters

Highpass Enable = 0

Highpass Frequency = 500Hz

Highpass Type = Linkwitz-Riley 24dB/oct

Lowpass Enable = 1

Lowpass Frequency = 790Hz

Lowpass Type = Linkwitz-Riley 36dB/oct

Object(11.37.1): Ch1 FIR Filter

Enable = 0

Frequency = 500Hz

Mode = Bandpass

Latency48KHz = 3.17 ms

Latency96KHz = 29.33 ms

Type = Linear phase 48 dB/oct

Object(11.37.2): Ch2 FIR Filter

Enable = 0

Frequency = 1.2kHz

Mode = Lowpass

Latency48KHz = 3.17 ms

Latency96KHz = 29.33 ms

Type = Linear phase 48 dB/oct

Object(12.34.1): Ch1 Speaker EQ Filters

Enable 1 = 1	Frequency 1 = 760Hz	Q 1 = 2.5	Slope 1 = 6	Gain 1 = -4.3dB	Type 1 = Parametric EQ
Enable 2 = 1	Frequency 2 = 7.1kHz	Q 2 = 4	Slope 2 = 11	Gain 2 = 5dB	Type 2 = HP Shelf EQ
Enable 3 = 1	Frequency 3 = 3.1kHz	Q 3 = 3.5	Slope 3 = 6	Gain 3 = -5.6dB	Type 3 = Parametric EQ
Enable 4 = 1	Frequency 4 = 1kHz	Q 4 = 3	Slope 4 = 6	Gain 4 = 1.5dB	Type 4 = Parametric EQ
Enable 5 = 1	Frequency 5 = 4kHz	Q 5 = 6.56	Slope 5 = 6	Gain 5 = -1dB	Type 5 = Parametric EQ
Enable 6 = 1	Frequency 6 = 9.37kHz	Q 6 = 10.16	Slope 6 = 6	Gain 6 = 2dB	Type 6 = Parametric EQ
Enable 7 = 1	Frequency 7 = 11.2kHz	Q 7 = 13.25	Slope 7 = 6	Gain 7 = 2dB	Type 7 = Parametric EQ
Enable 8 = 1	Frequency 8 = 16kHz	Q 8 = 5.26	Slope 8 = 6	Gain 8 = 2dB	Type 8 = Parametric EQ
Bypass = 0	Enable 9 = 0	Frequency 9 = 1kHz	Q 9 = 4	Slope 9 = 6	Gain 9 = 0dB
Type 9 = Parametric EQ	Enable 10 = 0	Frequency 10 = 1kHz	Q 10 = 4	Slope 10 = 6	Gain 10 = 0dB
Type 10 = Parametric EQ	Enable 11 = 0	Frequency 11 = 1kHz	Q 11 = 4	Slope 11 = 6	Gain 11 = 0dB
Type 11 = Parametric EQ	Enable 12 = 0	Frequency 12 = 1kHz	Q 12 = 4	Slope 12 = 6	Gain 12 = 0dB
Type 12 = Parametric EQ

Object(12.34.2): Ch2 Speaker EQ Filters

Enable 1 = 1	Frequency 1 = 135Hz	Q 1 = 4	Slope 1 = 5.5	Gain 1 = -8dB	Type 1 = HP Shelf EQ
Enable 2 = 1	Frequency 2 = 254Hz	Q 2 = 10	Slope 2 = 6	Gain 2 = 2.6dB	Type 2 = Parametric EQ
Enable 3 = 1	Frequency 3 = 340Hz	Q 3 = 3	Slope 3 = 6	Gain 3 = -0.5dB	Type 3 = Parametric EQ
Enable 4 = 1	Frequency 4 = 197.5Hz	Q 4 = 6.31	Slope 4 = 6	Gain 4 = 0.9dB	Type 4 = Parametric EQ
Enable 5 = 1	Frequency 5 = 21.5Hz	Q 5 = 1.77	Slope 5 = 6	Gain 5 = 4.7dB	Type 5 = Parametric EQ
Enable 6 = 1	Frequency 6 = 61.5Hz	Q 6 = 5.32	Slope 6 = 6	Gain 6 = -0.8dB	Type 6 = Parametric EQ
Enable 7 = 1	Frequency 7 = 236Hz	Q 7 = 6.56	Slope 7 = 6	Gain 7 = 0.4dB	Type 7 = Parametric EQ
Enable 8 = 1	Frequency 8 = 400Hz	Q 8 = 7.43	Slope 8 = 6	Gain 8 = -0.5dB	Type 8 = Parametric EQ
Bypass = 0	Enable 9 = 0	Frequency 9 = 1kHz	Q 9 = 4	Slope 9 = 6	Gain 9 = 0dB
Type 9 = Parametric EQ	Enable 10 = 0	Frequency 10 = 1kHz	Q 10 = 4	Slope 10 = 6	Gain 10 = 0dB
Type 10 = Parametric EQ	Enable 11 = 0	Frequency 11 = 1kHz	Q 11 = 4	Slope 11 = 6	Gain 11 = 0dB
Type 11 = Parametric EQ	Enable 12 = 0	Frequency 12 = 1kHz	Q 12 = 4	Slope 12 = 6	Gain 12 = 0dB
Type 12 = Parametric EQ

Object(13.20.1): Ch1 Speaker Delay

Coarse = 0s

Fine = 0s

Coarse Bypass = 0

Fine Bypass = 0

Object(13.20.2): Ch2 Speaker Delay

Coarse = 0s

Fine = 270us

Coarse Bypass = 0

Fine Bypass = 0

[4313B]

And the net results:

Keep in mind that there is a single protection capacitor of undetermined value and a passive resistor network of undetermined attenuation between the D2430K and the amp. So 6 dB electronic filter coupled with 6 dB passive filter on the D2430K in the M2, just like a properly bi-amped 4430 or 4435.

[ivica]

And the net results:

Keep in mind that there is a single protection capacitor of undetermined value and a passive resistor network of undetermined attenuation between the D2430K and the amp. So 6 dB electronic filter coupled with 6 dB passive filter on the D2430K in the M2, just like a properly bi-amped 4430 or 4435.

Hi 4313B,

Many thanks for the data You have shown us.
I would need some time to try to understand ( if EVER ) the presented data and the meaning of the attached tables.

May be:

http://www.musicdsp.org/files/Audio-EQ-Cookbook.txt

would be used to get the real curve ????


Regards
Ivica

[4313B]

I tried to highlight the pertinent information in the tables in red but the "save" didn't take. I'll try something else.

Channel 1 is the high pass and Channel 2 is the low pass.

[4313B]

Boiled down:

Very nicely done system.

[sebackman]

Hi,
It may be easier to read the parameters from 4313B with the a picture of the DSP design.



Regards
//RoB

[ivica]

Boiled down: Very nicely done system.

Hi 4313B,
Thanks for the data You have sent, but it seems to me that room EQ is present there (is it ???), because when I have entered the data curve ( lowered 20dB) that I have got differed too much looking at the curve you have presented earlier.

Regards Ivica

[4313B]

the curve you have presented earlier

What curve was that?

[ivica]

What curve was that?

Hi 4313B,

Ops, I have made an error while 'copying your data', but I thing the curve looked like yours now and I think it is correct.
I have put the data ( Fo, Q, Gain, Slope...from your table) in series (14) of digital 'bi-quad' filters ( for EQ and shelf-ing) that would use such info in order to recalculate their responses, and the shown F/R response can be get.
And added Hi-pass (Butter[1] where Fo=782Hz, 6dB/oct). In order to "simulate" unknown RC filter in-front of D2430K driver I have tried with Butter[1] filer too. On the presented attachment its Fo=700Hz (too).
I am not sure whether on Your data room-compensation is applied or not. ???

After 'inverting the filter responses', and removing Hi pass filters 782Hi Hi-pass, and (RC) 700Hz , I have got attached. So that would be D2430K & M2 horn response , is it ?????

In order to compare previously presented D2 response
[http://www.audioheritage.org/vbullet...&d=1358927209]
in different (unknown) horn I have made a mixture of both.
Interestingly that there are some very correlated behavior from over 1kHz. May more smoothing have been done wile compensating D2430K drivers responses in M2 box.
Looking at the "inverted curve", the behavior of the D2 driver with M2 horn under 1kHz (either the driver or M2 Horn) is something that would make the places for any of them to be improved, I can guess, or would limit their usefulness in the region under 1kHz.

Regards Ivica

[4313B]

I am not sure whether on Your data room-compensation is applied or not. ???

My assumption would be that the base configuration is anechoic.

So that would be D2430K & M2 horn response , is it ?????

Looks reasonable to me but you might want to put it on a more common scale, maybe a 50 or 60 dB scale instead of 20 dB?

Looking at the "inverted curve", the behavior of the D2 driver with M2 horn under 1kHz (either the driver or M2 Horn) is something that would make the places for any of them to be improved, I can guess, or would limit their usefulness in the region under 1kHz

I was quite surprised that they came up with the ~ 800 Hz crossover point for the D2430K. It worked out well though. I think a big part of it is how they shelved the 2216Nd. And we now know where that 2 dB efficiency hit came from compared with the S4700. 94 dB - 8 dB HP shelf + 6 dB baffle step = 92 dB

I have had limited time to try this out on the Everest II components and the results have been very promising.

[ivica]

My assumption would be that the base configuration is anechoic.Looks reasonable to me but you might want to put it on a more common scale, maybe a 50 or 60 dB scale instead of 20 dB?

.....I have had limited time to try this out on the Everest II components and the results have been very promising.........

So on 60dB scale,
but some time too large scale is only "good" for marketing purpose,
I think for real technical "analyze" "smaller" scale is better.

Here, I 'only' wonder if Q round 10 is good think for listening in any speaker compensation.

I am sure that with DSP applied EQ on DD66000 would produce very linear F/R, as it is quite good with passive networks too.

Regards
Ivica

[4313B]

So on 60dB scale,
but some time too large scale is only "good" for marketing purpose,
I think for real technical "analyze" "smaller" scale is better.

Regards
Ivica

True, but most people are probably used to seeing the large scale plots.

[ivica]

True, but most people are probably used to seeing the large scale plots.

Or, may be they prefer to see 'flat curves'

[cooky1257]

I can not imagine that the real production cost for 476Be would be more expensive relative to D2430K. Yes, Beryllium or Magnesium diaphragm is may be more expensive (as raw material) but the phase plug for D2430K seems to me not so easy task to produce too. In any case I believe that for any of the mentioned drivers real production cost has marginal influence to the final 'market' price.
Let us have a look what would be the price for Radian 951BePb about 1,100 U$D
( http://www.usspeaker.com/radian 951Bepb-1.htm )

and the AH-forum member Guido comparison between 476Be and 951Be, the behavior "almost" the same.

http://www.behringer-electric.de/fil... Radian950.pdf
http://www.behringer-electric.de/fil...6 vs 476Be.pdf

So it would be "interesting info' what would be D2430K price when (an IF) JBL decide to put on its price list.

Regards
Ivica

After inverting Guido's curves, out of curiosity I took a screen grab of my own DSP eq curve(vert div=10dB) for my H9800clone/2452/Be combo- pretty close;

[macaroonie]

Some of youze might be interested in this ad , D2's in Mexico

http://articulo.mercadolibre.com.mx/...od-d2-430k-_JM

$5500 mex ??? Not at all sure what that equates to in real or funny money.

PS. Don't shoot the messenger.