JBL Master Reference Monitor

[4313B]

I wish more speaker systems came with their own DSP.

[hlaari]

I am interested to know how they can get the 2216Nd down to 20Hz
I read in the tech info at the 2216Nd have fs around 36 - 39Hz

there have to be much of eque in the lowest frequency

[dr_gallup]

I am interested to know how they can get the 2216Nd down to 20Hz
I read in the tech info at the 2216Nd have fs around 36 - 39Hz

there have to be much of eque in the lowest frequency

The response curves look to be about 10 dB down at 20 Hz.

http://www.jblpro.com/products/recor...l#.UX2OMcoXEjk

[Valentin]

Room gain will easily give you the gain @ 20 to 40hz

The measurements are anechoic so the boundary effect will be more than generous if you use the eq it will probably be to reduce in most rooms

if you see the specs of the similar s4700 the m2 has lost 2dB in sensitivity i would supect it has to do in geting this extra low extension (flat too 40hz) and a -10dB @ 20hz

If you whant for movie post production you would be using subs

[Bobecca]

Thats why my fingers start to itch every time I read that text
Oboy, this descisions one have to make all the time.

What is the power requirement needed to feed that horn. Can it be 1250 Watts in 8 ohms

I know that there is a possibility to set a limit of power in RMS in Crowns. Interesting to see the DSP settings.

So, according to the manual, there is no x-over in the M2! I was right all a long

[maxserg]

Anyone have a review of the JBL Master Reference recently?

[4313B]

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[4313B]

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[Robh3606]

Interesting

Thanks for the peek behind the magic curtain.

Rob

[Valentin]

thanks

[macaroonie]

Very interesting 4313b.

For anyone interested in having a tinker with this kind of dsp correction you can download FREE XTA software

Audiocore V8.81 here http://www.audiocore.co.uk/software-..._download.html

It is a similar platform and will let you do all that stuff in a very visual manner.

Not sure whether the Crown software is free to use.

I had a rummage around the web recently re M2 , practically nothing to report , odd.

[4313B]

Not sure whether the Crown software is free to use.

It is. And it is available via the downloads library to the right on the M2 webpage.

http://www.jblpro.com/products/recor.../M2/index.html

One can load the M2 file into the System Architect Software and check out all the values. They can be re-created via other solutions if desired. One doesn't have to spend an additional twelve grand on Harman amps if they already have a decent backend.

4338/4365, K2 or E2 components with this kind of technology can get real fun, real fast.

I am interested to know how they can get the 2216Nd down to 20Hz
I read in the tech info at the 2216Nd have fs around 36 - 39Hz

there have to be much of eque in the lowest frequency

Fs ~ 36 Hz.

From inspection, it appears they are using a quasi-sixth order bottom end, 4.7 dB boost at 21.5 Hz with a Q of 1.77. The box should be tuned right around that frequency.

It follows Keele's research into taking a quasi-third order or fourth order box (air load) and reducing the tuning frequency by 1.4 and applying the boost. In this instance, the box would normally be tuned to around 30 Hz without boost. For reference, the S4700 is tuned to 32 Hz (I didn't realize the S4700 box was a whopping 4.8 cu ft). 42.375 x 18.75 x 14.625 compared to 49.5 x 20 x 14 for the M2.

[maxserg]

Thanks 4313B for those interesting informations! You rock!

[pos]

So they are using a 6dB/oct electrical HP filter on the compression driver, like in the S9800 !
Does the M2 include a protection cap on the compression driver?

[macaroonie]

It seems as if Sweetwater have these in stock for immediate delivery !!!

http://www.sweetwater.com/store/detail/M2System/

Can one of our field agents nip down and report back please.