Used - Synergistic Research UEF Performance Enhancer USB
No box, just USB device.
Performance Enhancers are a new UEF filter that lower your system’s noise floor, so you hear more music with greater clarity and less noise for sweeter highs. We start with a new UEF Compound, first developed in conjunction with our flagship cable loom, SRX. When you pop one UEF Performance Enhancer in your system, you’ll find yourself listening longer and, perhaps, at lower volumes as your system seems to flow better. When you insert a second UEF Performance Enhancer, you will likely hear a magnification of what you experienced when only one filter was in your system. Improvements include deeper and tighter bass, an expanded soundstage, and detail that rises above a now lower noise floor. But be careful; UEF Performance Enhancers are powerful, so you may find yourself groovin’ late into the night!