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Old 19th March 2012, 03:33 PM   #1
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Default Lepai 2020 as measurement amp?

Does anyone know the response of this popular little Lepai? I'm considering using it for speaker measurement because it's:

Small;
Light;
mini jack input; and
Volume control;

But it's so cheap and all, I'm not sure it's suitable. Has to be linear. I wouldn't be using it for measurements much past 2.83V. Anything above that I'll drag out something tougher.

Thanks for any help.
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Old 19th March 2012, 06:48 PM   #2
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You can't connect anything beside speakers to it's output, because they are in BTL mode (no ground, differential). So this rolls-out impedance measurements, leaving just a FR/THD plots.

You'd better check "big opamp"-style circuits, such as the chipamp concept.
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Old 19th March 2012, 07:22 PM   #3
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Yup. I only want to be able to hook up speakers outside with this. That's why I want something small and portable. I just need to know if it's reliably flat? I don't have a clue about amplifiers
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Old 19th March 2012, 07:52 PM   #4
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The chips it self have linear response from 30 Hz to 5000 Hz. 10 Hz is 0,5 dB down and 20.000 Hz also 0,5 dB down. I don't know if that is also the case with the Lepai, but they should be able to have similar characteristic's. You could also consider ready made pcb's. They are around 7-10$ incl. freight. I have seen Tripath TA2024, Yamaha YDA148 and others
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Old 19th March 2012, 08:14 PM   #5
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Thanks for this info. I might give it a try then. Better would be nice. But this would sure be convenient.

I'd try a ready made PCB, but honestly have no clue what I'm doing with amps. I was unsure buying a power supply for my Lepai let alone assembling a kit
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