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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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On 6/18/2020 at 9:52 AM, peniku8 said:

What‘s the purpose of those caps? DC blocking? Wouldn‘t it possible to just short em instead then?

possibly they are not needed, its hard to tell because powering the unit up outside its case is tricky. 

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