Very lowel audio level

Moderators: Cameron Shoffner, Christian Cook, Kirk Fyvie, Martin Barbour, Fred Thomke, Gary Evans_QSC

Thu Oct 16, 2008 2:48 am

  • Hi,

    We just bought a couple of QSC products, DCM 30D amps, speakers and sub woofer.

    In our theater, we are using a CP650 sound processor. We connected the CP650 to DCM using 25PIN cable and put in the analog input of DCM 30D. Then, using data ports (cable from QSC) we connected the amps to the DCM 30. The audio level on all the speakers are very low. Even we increase the gain of DCM to maximum 6 db.

    Connected to the DCM thru data port are:
    DCM 1824 - for FL, C and FR one DCM 1824 each, DCM 1222 for surround, DCM 3422 for Sub. We are using QSC loud speakers SC433 with horns. and SB 7218 for sub. We are using our old speakers for sorround (Not QSC). When we powered the set-up audio is very low. We can barely hear it.

    When we connected the CP 650 direct to the amps without passing DCM 30 audio level is good. We did this by getting the pin assignment of cp 650 and connecting say Center to the 3 pin (green) connection of the amps.

    Can anyone help?


    Noel
    noel
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Thu Oct 16, 2008 9:22 am

  • Hello Noel,

    From your question, your wiring seems to be terminated correctly however make sure that the amplifier channels are wired to the appropriate loudspeaker driver re: the high frequency signals are not being mapped to a low frequency driver.

    Also, check the setup settings in DCM Manager 2007. A SC-433 can be used either in bi-amped or tri-amped configuration. Confirm that the DCM Properties window has been configured correctly as well.

    I would suggest after verifying all of the properties and values are correct for your theater setup, download the DCM config to the DCM-30D once more.

    As for the DCA amplifiers, have the gain settings fairly up, more than 12 o’clock.
    Brad Sambrano
    Systems Support Engineer
    QSC Audio Products, LLC
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    Brad Sambrano
    QSC Audio Products
     
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Thu Oct 16, 2008 10:07 am

  • Hi Brad,

    We tripled check the mapping of the loud speakers, we are sure that it was done properly. The amps gain is already at around 3 oclock. If we will not feed the cp 650 to the DCM and we will go direct to the amps, the gain is only at 11oclock and we already have a fairly good audio level in the theater.

    One thing, if we will monitor the processor using the DCM, the monitor speaker is giving good sound level. The moment we shift to amps, even we set the monitor volume to the max the sound is still weak.

    Any other matter that we might have not done?

    Thanks
    Noel
    noel
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Fri Oct 17, 2008 4:36 am

  • hello,

    cp650 level should be around 103, check the levels settings into the dcm and see that every band is not set for -X db (meaning the HF band,LF BAnd,MF band)

    It should be around 0 and -5db

    Also make sure that you selected the correct speaker model, you have sc433 in to different config.
    kurt
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Fri Oct 17, 2008 6:06 am

  • Hi kurt,

    Thank you we will do as advised and will let you know the result

    Noel
    noel
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Fri Oct 17, 2008 9:17 am

  • Noel,

    I received some info from the Cinema dept; they are out of town at the Show East show. Sam Hynds mentioned he would respond to your request given time away from the show booth.

    Sam mentioned what Kurt echoed: the Dolby CP650 needs to be at least to 100 with the amplifiers gain fully up.
    Brad Sambrano
    Systems Support Engineer
    QSC Audio Products, LLC
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    Brad Sambrano
    QSC Audio Products
     
    Posts: 198
    Joined: Thu Mar 06, 2003 2:01 am
    Location: Costa Mesa, CA



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