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Need test source


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I need a small source device to be able to test our powered subwoofers.  A phone doesn't provide enough voltage to push our subwoofers to their limits.  I have used a computer with a USB interface (Focusrite 2i2) and it can get fairly loud but I forgot my computer at home one day and couldn't test.  So I'm hoping for something pretty small that I can play through or attached to a phone and has enough voltage to get the subwoofers really moving.  Does anyone have some ideas on such a mini preamp with subwoofer out?  Thanks.


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