OPEN BOX. Authorized Dealer. A newcomer shows the world the true sound of music. Solid state dual mono amplifiers deliver stunning speed and clarity, with hard hitting bass and drums and beautifully smooth tube-like decay to cymbals and string instruments, on up beyond perception, the Formula S amp is tuned for the highest resolution music and headphones. Impeccable balance, smooth and clear to the source, excellent bass definition, simply put the dedicated headphone amp every conneseur seeks. And it's stout size takes up less real estate on your desktop.Note from Joe@ABYSS:The Formula S amplifier was specifically designed for the ABYSS AB-1266 Phi CC and comes as a highly recommended mate to appreciate the headphones resolution and musical abilities. Given it's power and gain the Formula S will work it's magic on any full size high-performance headphone.The sonic signature of this amp can be best described as having a highly refined, detailed yet full sound with plenty of harmonic richness approaching that of a high performance tube amp without the heat. As amplifiers go, in my 30+ years in audio it's sonic signature is what everyone seeks as they spend too many years on the merry-go-round.Upgrade the already excellent sound of your XIAUDIO Formula S headphone amplifier by adding the Powerman external high current power supply to your order.FEATURESFull Class A output for smooth powerful soundHigh quality design and components throughoutAll aluminum construction with durable beaded finish and permanent laser markingsProvides three of the most popular output connections for high performance headphones, 1/4" (6.3 mm), 4 pin XLR, and dual 3 pin XLRHigh quality ALPS volume control goes from 'zero to Eleven'Fully regulated power suppliesOutput protection and turn-on/turn-off delay keeps your high end headphone investment safe.Single set of inputs wired direct to the volume control with JPS Labs Alumiloy® wire, no switches or extra circuit paths. Choose XLR or RCA inputs.Designed with the ABYSS AB-1266 planar headphone for high resolution playback and ultimate bass control with the most demanding headphones115/230 VAC AC input selector with standard grounded IEC AC cord socket (AC cable not included, JPS Labs PAC Lite recommended)Circular connector for future options (battery supply, etc)SPECIFICATIONSInput Connectors: XLR, RCAInput Z: 10 KohmsOutput: 6W @ 16 ohmsInput Sensitivity: 1000 mVGain: Selectable 10 dB (Low) / 16 dB (High)THD: 0.0006% @ 300 mW, distortion character compensated for high-end music playbackNoise floor: -110 dBVDimensions: 24 cm x 29.3 cm x 13 cm (9.5"W x 11.5"D x 5.1"H)Weight: 4.8 kg (10.5 lbs) (amp only)100-115VAC/230 VAC, 50/60 Hz, CE certifiedHIGHLY RECOMMENDED for our ABYSS AB-1266 headphone