Guitar amp help?

that REALLY depends...that spider III HD75 is only running 75 watts...if you have a 100W cab, you might underpower the speakers, which is really hard on speakers. You would need to check to see what your cab is rated at. I would certainly NOT power a full stack (8x12) with that line6 head.

But it's weird, I'm looking up the Line6 Spider III 4x12 cab that you can buy with the HD75, and it is a 320W rated cab! So, maybe you will be fine...I guess just make sure each speaker in your cab is rated at 80W...going off of the model for this Line6 Spider III cab: 320W divided by 4 speakers = 80W each. I don't know what else to tell you...I'm a little confused now that I saw the rating of that Spider III cab. But no matter what, you need to make sure you are running a 1/4" SPEAKER cable between your amp and your cab...not an instrument cable...no guitar cords.

Good Luck

People ask this often. Here's the problems, starting with the most serious: Blow the amp. That's right, it takes more excursion (speaker cone movement) to make a bass note than a guitar note. Can literally tear the cone over time, but more likely just makes the amp sound terrible, getting worse over time. Improper EQ - guitar settings don't voice bass notes well. Under Powered - it takes 3 bass watts to do 1 guitar watt, solid state to solid state (tube is a different story). You'll have no head room, and have to crank it, making #1 above happen faster Cab issues - guitar cabs aren't made to help bass notes. Plug into a Fender Rumble 15 (cheapest Fender bass amp), and then a vocal or keyboard amp. Listen to the difference. In short, YES you do. Also if you want effects, many of them need to be bass effects (although not all)