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Add Cab to Combo

Discussion in 'Amps and Cabs [BG]' started by smguy, Mar 13, 2010.

  1. smguy


    Feb 13, 2010
    This may be a stupid question but I've poked around a bit and can't quite find an answer. I have a Markbass Mini CMD 121P combo amp and I'm thinking of adding a second cab to it. The description on the guitarcenter website says "you can hook up to another 8 ohm cab for a 500W rig." My question is, does this mean that the whole system will total 500W (300W [normal for the amp] + 200W for the cab), or that it will send 500W to the cab? I'm thinking it's the second but I figured I would make sure before getting a cab. Better safe than sorry.

  2. Rick Auricchio

    Rick Auricchio Registered Bass Offender

    Assuming GC knows what they're talking about, you'll have a total of 500w available. It will be split between the internal speaker and the external cab.

    That said, you probably won't be able to use anywhere near the full 500w; most cabs will fart out long before that.
  3. The AMP is capable if delivering 500 watts @ 4 ohms, and 300 watts @ 8 ohms.

    Your combo right now is equipped with an 8 ohm 12" speaker, so you are operating at maximum of 300 watts.

    Adding another 8 ohm external cab will bring your ohm load down to 4 ohms, and the amp will be maxing at 500 watts.

    Those 500 available watts will be divided equally between your internal speaker, and the external cab...........each getting a max of 250 watts.
  4. fourfinger


    Apr 17, 2003
    Central Ohio
    From specs:

    500W @ 4 ohm / 300W @ 8 ohm

    This means that the amp without a 2nd cab delivers 300W to its internal speaker, which is an 8-ohm speaker.

    If you add an extension cab that is also 8 ohms, the amp's load is now 4 ohms.

    The amp will now deliver 500W total, which will come out to about 250W into each speaker. The total volume level will now be a lot higher.

    (You should only add an 8-ohm cab; trying to add a 4-ohm cab thinking you can draw extra wattage out of the amp would be asking for catastrophe.)
  5. fourfinger


    Apr 17, 2003
    Central Ohio
    Wow, 3 replies in just 2 minutes.
  6. smguy


    Feb 13, 2010
    Oh okay. So Long story short, I should look for a cab rated at 8ohm/~250W. Thanks for the info!
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