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Reviews around difference (5.00 of 5)
Little Bear B4 Portable Vacuum & Valve Tube Headphone Amplifier HiFi for Phone
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After spending a little time and doing a careful comparison between iMac->Grados vs iMac->Tube Amp->Grados, I can say that this actually makes quite a big difference and really improves the sound.
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Beyer Dynamic DT770 Pros, and the difference is immense
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