You could, but the crossover points aren't particularly suited for electric guitar. Not sure what the goal would be, other than to muddy up low end.
So if you're only playing the Axe III and not anything else through it, I'd say you can skip the sub.
I was wondering can you add a subwoofer to the Axe fx III? I was wanting to use it in my home setup. If it is possible how would I go about setting it up?
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If you're using it in a studio setup with other instruments (that occupy that part of the audio spectrum) then have at it, though without a treated listening environment you'll be in for a world of pain. Otherwise don't waste your money.
Bare in mind, most studio monitors are good down to 20Hz which well and truly covers the guitar range, coupled with the fact that most home studios aren't large in size so it's not as if a huge amount of air has to be moved to get good loud sound.
What car are you driving?Sorry to disagree but I’ve never come across any enthusiast level near field monitors that can come anywhere close to 20Hz, maybe 50Hz or so, but even then the response is way down. Maybe if we are talking ultra high end stuff costing more than my car, but no JBL, Adam, Presonus, Mackie, Behringer, M-Audio et al., monitors are going to come close
You don’t have to be a full wavelength away from a speaker to hear it.Where is anyone monitoring a 20Hz wave from, the next state? It’s approx 60ft long.