I am a bass player, but if it were my site I'd start with guitar amp and cabs. The frequency range for guitars is higher and just does not take as much power to produce. So you can have a gigable small guitar amp, but a gigable low-power bass amp is an oxymoron. I loved the sound of my old Sunn tube amp, but my back loves my new class D, 6 lb Carvin.
Bass cabs are also tougher to design and execute...more like a hi-fi cab--and generally bigger or heavier or both if the are going to move much air. The old saw is still true that the perfect bass cab would be light, loud and small--but you can only actually get too out of the three.
Don't get me wrong--I'd love to see bass amps and cabs...it's just not the lowest hanging fruit IMHO
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