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Pro-ject The Classic
Starting points: Pro-Ject's Head Box S2 | Darko.Audio
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ART HeadAmp 4 Pro 4-Channel Headphone Amp with Talkback | Reverb
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DIY Hi-Fi: Class a Hybrid Headphone Amp : 6 Steps (with Pictures) - Instructables
Amazon.com: Pro-Ject Head Box S Audiophile Headphone Amplifier in Silver : Electronics
