This stereo preamp by Transcendent Sound boosts audio signals while cutting unnecessary interference and noise (the power supply and audio circuits are isolated on two separate boards to assist with noise reduction), thus readying electrical signals for further amplification or processing. True audiophiles will enjoy the DIY process of putting the kit together almost as much as they’ll dig using it once it’s assembled. The kit also comes pre-assembled, for the slightly less tech-savvy,

Transcendent Sound Grounded Grid Preamp, $500 (kit) - $800 (assembled),

Available at transcendentsound.com