Amp Head (GK mb200) straight to PA - Will it mess up my PA System??

Discussion in 'Amps and Cabs [BG]' started by davidtkdjgs, Dec 24, 2019.

  1. davidtkdjgs


    Dec 24, 2019
    Hi, just joined TalkBass recently.
    I'm a BIG noobie when it comes to Amps and Cabs so please help me out.

    I have been thinking about connecting my amp head straight to PA without a Cabinet but I've done some research and it seems like that's not a good idea for most people.

    However, the amp head I own is a GK mb200 and on its manual, it says "The MB Series provides a low noise, high quality balanced direct output for connection to PA and recording consoles."

    So could I connect my GK mb200 straight to my PA system without ruining any electronics inside?
    bbh likes this.
  2. Jaco who?

    Jaco who?

    May 20, 2008
    It should work fine. I don't know of any solid state amps that warn against not having a load connected.
  3. Stumbo

    Stumbo Guest

    Feb 11, 2008
    What is your PA configuration?

    Dues your PA have subs?

    Does your PA have monitors that will handle the bass?

    Do you have the correct cable for the direct out?

    Under no circumstances hook your amp's speaker outputs to anything other than speaker cabinets.
  4. JimmyM


    Apr 11, 2005
    Apopka, FL
    Endorsing: Yamaha, Ampeg, Line 6, EMG
    And provided you're good to go on this front, you don't need to hook up a cab to your amp to run it in the PA. That's something you only need to do for all-tube amps and a very small and rare amount of solid state power amps with output transformers, all but one which hasn't been made since the 60's since making them without output transformers is a lot more practical. Otherwise, any SS or hybrid bass amp you see will run fine without a cab.
    Al Kraft, dralionux and Stumbo like this.
  5. DirtDog


    Jun 7, 2002
    The Deep North
    Used to do it all the time with my Ampeg rig. Ran it without the cab plugged in all the time.

    Use the DI out, connect an XLR (mix cable) from the amp to an input on your mixer.

    You may not get good results depending on your mains speakers and monitors, but then again, you may get good results.

    I had good results using EV ZLX15P or QSC K12/subs speakers and IEMs.
  6. two fingers

    two fingers Opinionated blowhard. But not mad about it. Gold Supporting Member

    Feb 7, 2005
    Eastern NC USA
    Welcome to TalkBass!!!!!

    There's nothing to it. Below is a picture of the rear panel of your amp. Get a regular microphone cable and run it out of the circles output and into an open channel on your PA mixer. Done.

  7. I do it every week. GK Legacy into both a small Phil Jones 2 x 7" cab for personal monitoring and the DI goes to the house. Set your DI to PRE so anything you do on the amp will never reach the FOH. Get compliments about how I sound in the house and my reply is "I have no idea how I sound in the house!" The FOH people take care of that. I just need a little on-stage sound for me and the tiny PJB cab works fine.
    H2okie likes this.
  8. basscooker

    basscooker Commercial User

    Apr 11, 2010
    cincy ky
    Owner, ChopShopAmps
    And you can even choose to run your feed to the PA pre or post eq.
    Al Kraft and Stumbo like this.
  9. Drifter_Bass


    Apr 5, 2017
    MPLS, MN
    Yepp - this is a great idea. This will work as others have pointed out. As long as your PA has subs or speakers that can handle straight bass guitar feeds, you'll be A-OK!
  10. You can even do BOTH! Run a mic cable from the DI Out of your GK MB200 to a channel input of the PA, AND run a speaker cable from the speaker out of the MB200 to a bass speaker cabinet!!!
    AT THE SAME TIME!!! :woot:
  11. 74hc


    Nov 19, 2015
    Sunny California
    Is the D.I. on the MB200 line level, or mic level?
  12. Not yet

    Not yet

    Mar 26, 2012
    Used mine for years at Casinos instead of the Direct Box they provided

    Gave me control beyond their set and walk eq for my in ears and the thru Casino PA

    Worked great for me and they never complained
  13. Stevorebob

    Stevorebob Well... I Am Here, Aren't I? Supporting Member

    Sep 29, 2011
    Los Angeles
    Yes. The MB200 works great as a preamp/DI without a speaker load. No worries for damage. I’ve been running my MB200 everyday for 5 years or so as a headphone practice amp with no speakers connected, and no problems.
    Al Kraft likes this.
  14. Esteban Garcia

    Esteban Garcia bassist, arranger, aelurophile Supporting Member

    Apr 11, 2018
    Portland, OR
    Can confirm the MB200 works great as a preamp/DI. :thumbsup:
  15. H2okie


    Jan 30, 2014
    Jacksonville, FL
    I now do the same set-up with a 2x8 Elf.
    Blankandson likes this.
  16. Line level
    dralionux likes this.
  17. mark107


    Jul 10, 2009
    I often use my MB200 as a DI in my studio. It's comparable to my Demeter and Tubetech micpreamps. Not only not a problem, but often a preferable solution.
  18. Primary

    Primary TB Assistant

    Here are some related products that TB members are talking about. Clicking on a product will take you to TB’s partner, Primary, where you can find links to TB discussions about these products.

    Jun 13, 2021

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