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It has bass and treble tone controls but has no transistors nor opamps to do it.
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That's probably not so bad, some of those amp ICs have pins for tone controls and have the necessary internals to get decent tone controls without needing external ICs.
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It sounds great! It sounds great! It sounds great!
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It's easier to put up with the "Chinese honesty" (ie the mislabeled specs) when it works well and gives decent value for money.
I'm surprised you didn't put the sine and 'scope on it and get a power output figure into 8 ohms? I don't think I could have resisted after the "150W" advertising.