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GBE750 POWERFLEX SWITCH?

Discussion in 'Amps and Cabs [BG]' started by ErnieD, Mar 6, 2008.


  1. ErnieD

    ErnieD

    Nov 25, 2004
    Atascocita,TX.
    Well I had a rough gig this past Sunday with my GBE750 & 2GB Neox212T cabs. Poor Roger (hasbeen) even while he was rushing to head out of town he took time to reply to 3 of my PM's asking him what could be up with my rig.

    I told him of how I started with my 55-02 and on the louder tunes, no PA support, with my blues-rock band I had the cabs distorting/breakingup while diggin in on the E string, A & G notes but wierd not really on my B string, low C note, it thumped fine but I was kinda muting it. I backed off of diggin in and it helped abit but a few times on some fast blues shuffles I'd hear the cabs fuzzin out and the O/L and main clip lites were flashing with each note I hit. Now I know thats not so bad but Ive never clipped this amp before and I did not feel my settings were that extreme this day. I had the pre knobs around 11 o'clock, all the other knobs were about 1-2 o'clock, the LF was at 2 o'clock, when I used it on some tunes, and the master volume was at noon-1. I then tried my passive Jazz 5 and had to leave the active button in to keep from getting that same distortion. I kept hitting the footswitch to try different settings and it seemed the tube/fet mix alone worked best but I did have to lower the settings on each bass.

    Now we were quite loud this day but I'd just used this amp w/ a single SWR410 8 ohm cab last gig and it worked out very nice, different room same bass. And yes, batt was good in the -02 and cables are all good.
    So anyway, I went back to read some GB search threads here and also looked back at the GB PDF manual, then I snapped :rollno: that I forgot to push the PowerFlex switch to 2ohms. I was running my 2 - 4ohm cabs in the 4-8 setting.

    I'd like to ask if this could have caused the symptoms I was experiencing at the gig, if so then great, it was my dumba$$. If not then I may have other issues or just expecting too much from these 2 cabs. Thanks for any advice/info. (and thanks again Roger, the CS at GB is unreal.)
     
  2. fishtx

    fishtx Supporting Member

    Mar 30, 2007
    Dallas, TX
    Endorsing Artist: Genzler Amplification/Spector Basses/Mojo Hand FX
    Yes...I experienced the same symptoms once at a sound check, before I realized I hadn't set the PowerFlex switch to 2 ohms. luckily i figured out what was going on after only a few seconds. I powered down, flipped the PowerFlex switch over to 2 ohms, and the problem went away...
     
  3. ErnieD

    ErnieD

    Nov 25, 2004
    Atascocita,TX.
    I'm hoping it was all user error, thanks FishTx. I play this same room twice more this month, so I'll be very aware of this. Now, anyone, can I just leave the Flexswitch in the 2 ohm setting all the time even when I use my single 8 ohm cab? Now of course that Im aware of my mistake, I'll prolly always check the switch first but just in case Im in dumba** mode again and forget it. So next gig I hope this is my fix and nothing else. COOL :cool:
     
  4. Fretlessboy

    Fretlessboy

    Nov 29, 2007
    St Augustine Florida
    Endorsing artist GENZ BENZ/HERCULES STANDS/XSonics
    lol.. I mean really not funny but funny. If you leave the powerflex switch to 2 ohms you don't have to worry about it. You can run at 4ohms with the switch on 2 but you decrease your power a bit. I know doing this with the 1200 knocks it back to around 750 watts vs 1000 at 4 ohms. I am not sure where the power would go on the 750 I am thinking 500? Anyway, I hope you got it straight.
     

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