Great points, Tom. Is this indicative of all GK heads?
The reason I ask is because I have an Acme Low B2 that, when powered by a different 300 watt head, farts a great deal, but when powered to similar volumes with my GK BL600, doesn't. The 210 type set up, as Andy from Acme has pointed out, isn't a particularly efficient cab design (the trade off for a small footprint), and thus requires a recommended 500 watts.
Just wanted to know if that's likely why I seem to have fewer issues running it with my Backline vs. running it with something else in that wattage neighborhood.
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