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Thread: JBL M2 DCX2496 settings

  1. #1
    Senior Member pos's Avatar
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    JBL M2 DCX2496 settings

    I have been working on porting the BSS M2 settings to the Behringer DCX2496.
    It was not an easy task because of the implementations differences and the lack of a few EQ and filters types (especially 36dB/oct filters, which is the reason for the difference in the woofer delay setting).

    Here are the settings, using 100% of the available power of the DCX2496.
    You might have to install a recent version of the firmware (1.16 or 1.17 depending on your hardware version) if you are not able to set all the EQ points.
    Even with the last version of the firmware you might have ressource warnings when unsetting an EQ point, but it should work OK

    The last two channels are unused, and no EQ of filter point is left for them (make sur you remove any EQ you might have enable there).
    They can be used to redirect the left/right input or their sum to a subwoofer, etc...

    Code:
    Setup:
    
    OUT CONFIGURATION LL MM HH
    OUT STEREO-LINK: ON
    IN STEREO-LINK: A+B
    
    ---
    
    Inputs (linked A & B) :
    
    GAIN: -2.3dB
    
    DELAY: OFF
    
    EQ: ON
    1: BP 1.14kHz +1.2dB Q=10
    2: BP 1.57kHz -1.3dB Q=3.2
    3: BP 9.26kHz +2.7dB Q=8.9
    4: BP 9.87kHz +1.2dB Q=1.3
    5: BP 11.2kHz +2.7dB Q=10
    6: BP 13.0kHz +1.1dB Q=4.0
    7: BP 15.8kHz +2.9dB Q=5.0
    
    DYN-EQ: OFF
    
    ---
    
    LF outputs (linked 1 & 2) :
    
    
    INPUT SOURCE: A for output 1 / B for output 2
    OUTPUT GAIN: -1.7dB
    
    X-OVER ADJUST MODE: FREE
    high-pass: OFF
    low-pass: LR48 917Hz
    
    EQ: ON
    1: BP 22Hz (first "22" step) +3.1dB Q=2.5
    2: BP 62Hz -0.9dB Q=4.0
    3: BP 92Hz +1.1dB Q=1.1
    4: BP 254Hz +2.8dB Q=10
    5: BP 196Hz +1.0dB Q=6.3
    6: BP 384Hz -9.4dB Q=0.4 (second "0.4" step)
    7: BP 393Hz -0.4dB Q=8.9
    8: BP 499Hz +1.5dB Q=5.0
    9: BP 1.00kHz -7.0dB Q=1.8
    
    DYN-EQ: OFF
    
    LIMITER: OFF
    
    POLARITY: normal
    PHASE: 0°
    
    DELAY: ON, SHORT=64mm/0.19ms
    
    ---
    
    HF outputs (linked 3 & 4) :
    
    INPUT SOURCE: A for output 3 / B for output 4
    OUTPUT GAIN: 0dB
    
    X-OVER ADJUST MODE: FREE
    high-pass: BUT6 1.35kHz
    low-pass: OFF
    
    EQ: ON
    1: BP 499Hz +1.1dB Q=5.0
    2: BP 770Hz -5.9dB Q=2.8
    3: BP 917Hz +3.3dB Q=4.0
    4: BP 2.40kHz +0.5dB Q=3.2
    5: BP 2.56kHz -1.1dB Q=10
    6: BP 2.98kHz -1.4dB Q=10
    7: BP 3.24kHz -8.5dB Q=1.4
    8: BP 5.54kHz -1.0dB Q=2.5
    
    DYN-EQ: OFF
    
    LIMITER: OFF
    
    POLARITY: normal
    PHASE: 0°
    
    DELAY: OFF
    
    ---
    
    Unused outputs (linked 5 & 6) :
    
    everything OFF
    Input gain (-2.3dB) is set to avoid any risk of UHF saturation when the processor is used at 0dBFS, but this is quite unlikely at these frequencies...

    As with the original BSS settings you might want to rework or remove the high Q woofer EQs at 196Hz and 254Hz if you are not using the original M2 enclosure or an exact clone of them.

    Here is a comparison between the measured output of the DCX2496 (red) and the BSS (green) :

    Name:  total.jpg
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  2. #2
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    Thanks!

    What about phase, is it exactly the same as the original BSS?

    Can you share the original measured BSS output as a file, so that it can be imported into REW? (I maybe want to try to do and measure this in dbx4820, to see how close I can get amplitude-wise).

  3. #3
    Senior Member pos's Avatar
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    Phase is matched in the passband.
    The DCX does not have 36dB/oct filters so I had to use 48dB/oct with EQ on the woofer, and then compensate for the phase difference with delay to get a phase coherent crossover.

    As you can see the magnitude is well matched in the stopband until around -60dB, which is 45dB down compared to the passband, no problem there :

    Name:  LF.jpg
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    Replicating the M2 settings with your DBX should be easier and you should be able to get away with the original settings as described in the google doc as a starting point (whereas it had to be done from scratch with the DCX).
    You can use the rephase presets to generate reference curves, as these are very closely matched to the BSS measurement I got from grumpy and sebackman, with a lower noise floor and no measurement artefacts (this is what I used here).

  4. #4
    Senior Member ivica's Avatar
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    Dcx2496 & m2

    Quote Originally Posted by pos View Post
    I have been working on porting the BSS M2 settings to the Behringer DCX2496.
    It was not an easy task because of the implementations differences and the lack of a few EQ and filters types (especially 36dB/oct filters, which is the reason for the difference in the woofer delay setting).

    Here are the settings, using 100% of the available power of the DCX2496.
    You might have to install a recent version of the firmware (1.16 or 1.17 depending on your hardware version) if you are not able to set all the EQ points.
    Even with the last version of the firmware you might have ressource warnings when unsetting an EQ point, but it should work OK

    The last two channels are unused, and no EQ of filter point is left for them (make sur you remove any EQ you might have enable there).
    They can be used to redirect the left/right input or their sum to a subwoofer, etc...

    Code:
    Setup:
    
    OUT CONFIGURATION LL MM HH
    OUT STEREO-LINK: ON
    IN STEREO-LINK: A+B
    
    ---
    
    Inputs (linked A & B) :
    
    GAIN: -2.3dB
    
    DELAY: OFF
    
    EQ: ON
    BP 1.14kHz +1.2dB Q=10
    BP 1.57kHz -1.3dB Q=3.2
    BP 9.26kHz +2.7dB Q=8.9
    BP 9.87kHz +1.2dB Q=1.3
    BP 11.2kHz +2.7dB Q=10
    BP 13.0kHz +1.1dB Q=4.0
    BP 15.8kHz +2.9dB Q=5.0
    
    DYN-EQ: OFF
    
    ---
    
    LF outputs (linked 1 & 2) :
    
    
    INPUT SOURCE: A for output 1 / B for output 2
    OUTPUT GAIN: -1.7dB
    
    X-OVER ADJUST MODE: FREE
    high-pass: OFF
    low-pass: LR48 917Hz
    
    EQ: ON
    1: BP 22Hz (first "22" step) +3.1dB Q=2.5
    2: BP 62Hz -0.9dB Q=4.0
    3: BP 92Hz +1.1dB Q=1.1
    4: BP 254Hz +2.8dB Q=10
    5: BP 196Hz +1.0dB Q=6.3
    6: BP 384Hz -9.4dB Q=0.4 (second "0.4" step)
    7: BP 393Hz -0.4dB Q=8.9
    8: BP 499Hz +1.5dB Q=5.0
    9: BP 1.00kHz -7.0dB Q=1.8
    
    DYN-EQ: OFF
    
    LIMITER: OFF
    
    POLARITY: normal
    PHASE: 0°
    
    DELAY: ON, SHORT=64mm/0.19ms
    
    ---
    
    HF outputs (linked 3 & 4) :
    
    INPUT SOURCE: A for output 3 / B for output 4
    OUTPUT GAIN: 0dB
    
    X-OVER ADJUST MODE: FREE
    high-pass: BUT6 1.35kHz
    low-pass: OFF
    
    EQ: ON
    1: BP 499Hz +1.1dB Q=5.0
    2: BP 770Hz -5.9dB Q=2.8
    3: BP 917Hz +3.3dB Q=4.0
    4: BP 2.40kHz +0.5dB Q=3.2
    5: BP 2.56kHz -1.1dB Q=10
    6: BP 2.98kHz -1.4dB Q=10
    7: BP 3.24kHz -8.5dB Q=1.4
    8: BP 5.54kHz -1.0dB Q=2.5
    
    DYN-EQ: OFF
    
    LIMITER: OFF
    
    POLARITY: normal
    PHASE: 0°
    
    DELAY: OFF
    
    ---
    
    Unused outputs (linked 5 & 6) :
    
    everything OFF
    Input gain (-2.3dB) is set to avoid any risk of UHF saturation when the processor is used at 0dBFS, but this is quite unlikely at these frequencies...

    As with the original BSS settings you might want to rework or remove the high Q woofer EQs at 196Hz and 254Hz if you are not using the original M2 enclosure or an exact clone of them.

    Here is a comparison between the measured output of the DCX2496 (red) and the BSS (green) :

    Name:  total.jpg
Views: 914
Size:  113.6 KB
    Hi Pos,

    Nice respectable presentation.
    I only wonder why BEFRINGER do not want to change Dsp in the Dcx2496 with newer ADSP Dsp allowing much more processor power.
    Regards
    Ivica

  5. #5
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    Quote Originally Posted by pos View Post
    Replicating the M2 settings with your DBX should be easier and you should be able to get away with the original settings as described in the google doc as a starting point (whereas it had to be done from scratch with the DCX).
    You can use the rephase presets to generate reference curves, as these are very closely matched to the BSS measurement I got from grumpy and sebackman, with a lower noise floor and no measurement artefacts (this is what I used here).
    Ok, I will try that. Sounds like a fun little project!
    And I will probably skip the woofer EQs at 196Hz and 254Hz to spare some EQs. Any of the EQ-points for the compression-driver that you think are candidate for removal for a M2-clone/clown, if I have to skip some due to dbx-limitation?

  6. #6
    Senior Member srm51555's Avatar
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    This is great work. It now gives us three different validated options and price points of DSP for M2 builds.

  7. #7
    Senior Member srm51555's Avatar
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    Has anyone tried this with their M2's. I'm thinking on picking one up just to experiment with others amps?

    Thanks,
    Scott

  8. #8
    Heather [Senorita member] hjames's Avatar
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    Behringer DCX2496 UltraDrive Pro - 24-Bit 96 kHz sound management system.

    If anyone is looking for one, I got one last September to biamp a pair of Magnepan MG2c speakers, but when I got that pair of JBL L212 speakers around Thanksgiving, I loved their sound and put the magnepans up for sale! So I won't need this electronic crossover plus management system after all. Not in the picture, but the power cord is included, of course
    The unit is nice and clean and works like a champ.

    It has a LOT of capability beyond use as a simple electronic crossover

    • Adjustable delays for all inputs/outputs allow correction for arrival time differences
    • Four different mono and stereo output operating modes
    • Butterworth, Bessel and Linkwitz-Riley filters with slopes from 6 to 48 dB/octave
    • Link option via RS-485 network interface enables cascading of several Ultradrive Pros
    • 60 user-defined internal presets storable via PC RS-232 connection


    They go for $300 new - I'll sell mine for $200/Offer plus shipping - and I pack REALLY WELL.
    I take paypal - just PM me

    Name:  IMG_0605.jpg
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    2ch: Oppo DV970, JoLida 502CRC, JBL L212, VonSchweikert VR4, Heath Valencias
    7.1: Oppo BDP103D, B&K, 2pr UREI 809A, JBL4641

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