This 4710D 4 Channel Mic Preamp is in perfect condition. Comes with factory box and manual. We guarantee you will love saving money and getting a great item.  The Universal Audio 4-710d is a boutique quality, 4-channel microphone/line preamplifier with unique tube and solid state tone-blending capabilities—perfect for a wide range of microphone and instrument sources. This versatile multichannel preamp offers selectable 1176-style compression circuitry on each channel, plus four additional line inputs feeding 8 channels of pristine analog-to-digital conversion. Building upon UA's classic analog design approach, combined with smart modern features, the 4-710d is the most flexible preamp in the UA lineup. At the core of the 4-710d are four channels of tone-blending "Twin-Finity" mic preamps with true-bypass 1176-style compression, including specially tuned "fast" and "slow" settings. Each of the four mic preamp channels allows for continuously variable phase-aligned tone, between a 100% tube and 100% solid state signal path. Send and return jacks are available for external processing or signal access. The eight analog inputs are digitized via ultra high-quality 24-bit A/D converters at selectable sample rates up to 192kHz. Digital output is available via dual ADAT "lightpipe" or AES/EBU DB-25 connectors, facilitating integration with most popular audio interfaces. Specifications: Preamplifiers4 TEC Award-winning 710 Twin-Finity microphone/line preamps, each featuring:Dual-path 285-volt Class-A tube and transimpedance solid state preampsPhase-aligned tone-blending of tube and solid state circuits, creamy to crunchyNewly designed 1176-style compression circuit per preamp channelJFET Direct Input with 2.2MΩ ultra Hi-Z impedance w/auto input overrideLarge backlit VU meters for flexible metering of input drive, gain level, and gain reductionBalanced send/return inserts (half-normalled)48V phantom power75Hz low cut filterPolarity switchMonolithic balanced output stage Analog-to-Digital Conversion8 channels of high quality 24-bit A/D conversion:Selectable sample rates up to 192kHzDigital output via dual ADAT optical and AES/EBU DB-25 connectors8-channel soft limiter (switchable for all channels)Ultra-low jitter clock subsystemLED metering array with clip/hold indicators75Ω BNC work clock I/ODigital outputs anti-pop protection on power-up OtherUniversal voltage internal power supplyHeavy-duty metal construction, two-space rack unit