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TC Electronic BH250 for GK MB115

Discussion in 'Amps [BG]' started by 8liter, Jan 19, 2013.


  1. 8liter

    8liter Supporting Member

    Joined:
    Apr 30, 2009
    The thread title sound weird, I know. But here is my situation.

    A while back I bought a new GK MB115 combo. Shortly after a year the head died. I was so busy with school and work that I wasn't doing any gigging at all, so I let it slide when I couldn't get the repair covered.

    Fast forward! I've been using my trusty Fender Rumble for bedroom practice, but now I have gigs coming up and I need a bit more oomph.

    My plan is to use a TC Electronic BH250 on the GK cabinet with the old head removed. I dissembled the amp/cabinet today and it's pretty basic from what I was expecting.

    The wires connecting to the 15" speaker use "slip on" style quick connectors with a simple red/black wire situation, so my main question is can I use the red and black wires and connect them to a speakon plug and run it to the BH250?

    Edit: I just remembered that I have a horn/driver on the cabinet as well. I'm not sure how to go about wiring that....hmm

    My apologies if my wording is hard to understand. I am very new to wiring and all this.
     
  2. Low Class

    Low Class Supporting Member

    Joined:
    Jul 4, 2005
    Location:
    Florida
    Yes
     
  3. 8liter

    8liter Supporting Member

    Joined:
    Apr 30, 2009
    Well that was relatively painless, haha. Thanks for the answer, Low Class.

    So now the plan is to connect the speaker to a speakon plug and then run a speakon to speakon cable to connect the plug to the BH250.

    Sounds good?

    I'm still curious about what I can do with the horn....
     
  4. Shardik

    Shardik

    Joined:
    May 24, 2011
    Location:
    Halden, Norway
    How was the horn wired inn the first place? I guess most amps have only one power section, which means the horn should have a passive high pass filter. The bass element and the input to that filter should be wired in parallel into the amp / speakon plug.
     
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  6. 8liter

    8liter Supporting Member

    Joined:
    Apr 30, 2009
    The horn just has two wires coming off it into a plastic plug, same as the main speaker. That's really all I can tell you. The original head had a driver on/off switch for the horn.

    I'm sure that's not what you were asking, but I am just too unfamiliar with electronic terminology to fully understand what you are asking and how to answer correctly. (I'm a noob).
     
  7. Shardik

    Shardik

    Joined:
    May 24, 2011
    Location:
    Halden, Norway
    That may mean that the filter was in the amp itself. Do not connect the horn without at least a highpass filter of some kind. The tweeter horn can not handle the full power from the amp.
     
  8. 8liter

    8liter Supporting Member

    Joined:
    Apr 30, 2009
    ahh, that makes sense now. Thank you for the warning.

    I will leave the horn disconnected for now and just run the BH250 to the main 15" speaker.
     
  9. AstroSonic

    AstroSonic Supporting Member

    Joined:
    Dec 10, 2009
    Location:
    rural New Mexico
    Hey, this is just what I had in mind if the amp in my MB115 failed and the repair cost was close to the cost of a small class D head (like the BG250 or a MB200). This will make a really nice, light weight 1x15 cab. Fitting the new head into the cab would be great if the fit is tolerable.

    The horn is a piezo and has no crossover other than an inherent rise in impedance below around 4-5kHz (er, like a crossover). The wires from the tweeter to the amp were required for the horn on/off switch. The horn may be wired in parallel with the bass driver. It would be a good idea to add a 10w 8 ohm resistor in series with the horn (some amps misbehave with capacitive loads). If you want a tweeter but don't like this one it could be a good time to add a better horn with crossover and L-pad. I put a new (better) tweeter in mine. The treble is now much smoother and more articulate.
     

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