Ultimate high-end sound with 3 XLR & 3 RCA line inputs! Four specific characteristics make this a true high-end preamplifier: 1. Fully balanced double mono design 2.class-A circuitry with no negative feedback 3. Tube output stage 4. Separate power supply as an upgrade option for further improved sound quality. Pre Box RS offers 3-dimensional sound-staging, perfect micro dynamics and ultimate resolution combined with flexibility to use XLR and RCA sources. Perfectly combined with Pro-Ject Amp Box RS amplifiers, Pre Box RS will give pure sound experience, that the real audiophile is looking for. • Fully balanced double mono design • Ultra-linear and ultra low noise • pure Class A circuitry • Input switching via relais • low ESR capacitors • blue Alps volume control • 3 XLR & 3 RCA inputs • 1 Pre-out XLR & 1 Record-out RCA • standby-power consumption < 1W • IR remote control included • metal casing protects against vibration and interference