is this good/bad/doesnt matter?

Discussion in 'Amps and Cabs [BG]' started by Ahhhson, Jun 30, 2003.

  1. Ahhhson

    Ahhhson Guest

    Jun 5, 2003
    ALBANY NY 518
    I have a qsc 1850hd, is it ok to crank the 1st channel in bridge mode and then regulate with your pre?

    Also, im bridged and at not until about 12 o clock am I any bit louder than my old 800rb, i thought this was like 1400 or 1600 watts?

    I have a SABDDI and with my old 800rb i used to only be abel to bring the level and drive to about 12 oclock ( combined with the GK, this was all the cab could handle, I now ave a new svt810e. I havent brought up the settings on the sansamp.

    When I open this baby up and past 12 o clock will i feel this new power?

    Im not at home right now

  2. Petebass


    Dec 22, 2002
    QLD Australia
    100% of PA operators run the power amp with the volume at maximum. They they use the desk to adjust the overall volume.

    Think of the desk as your pre.

    I'd only wind the power amp down if having it all the way up made the pre switch too "touchy".
  3. mikezimmerman

    mikezimmerman Supporting Member

    Apr 29, 2001
    Omaha, Nebraska
    "100% of PA operators"? Many do, but nothing remotely resembling 100%...

    With a tube preamp, I run the preamp at the level that gets me the tone I like, and use the power amp gain to set the overall volume. If I had to run the power amp at 100% all the time, the preamp setting would never get above "2".

    On our PA, we tend to run the power amps at about 80%. It really depends on what the performance volume is like, and when we start seeing clipping on each of the power amp inputs.

  4. Trevorus


    Oct 18, 2002
    Urbana, IL
    yeah, mine always runs about 80%. So if one of my bandmates does something dumb, like unplug a guitar while turned up, it won't hit the speakers so hard. I like to have a bit of headroom on every section. My EQ is at 50%, my amp at 80%, and my board at 75-85%.
  5. mikezimmerman

    mikezimmerman Supporting Member

    Apr 29, 2001
    Omaha, Nebraska
    Another consideration for a bass amp setup is that if you're taking the DI out of your preamp to go to the PA, changing the preamp gain will affect the DI signal level with many preamps. If the power amp is cranked all the way up and you're using your preamp gain to control overall volume, you can't tweak that during performance to adjust stage volume without also affecting the mix that's going to the soundboard, and that's usually not what you want.

  6. brianrost

    brianrost Gold Supporting Member

    Apr 26, 2000
    Boston, Taxachusetts
    As far as your volume, if you went from about 400 watts to about 1600 watts you are only getting an extra 6 dB of maximum volume. While easily noticeable, this is not a HUGE difference.

    To be "twice as loud" to human ears you need TEN TIMES the wattage (into the same speakers) :eek: