Audison Thesis HV Venti Class A 2 Channel Dual Mono Amplifier

HV venti Amplifier | 1600 W total power | 2 x 800 W @ 2ohm | A-class “The Amplifier” Absolute lack of compromise in achieving maximum performance is the mantra followed by the Audison R&D for the HV venti, a project with unique features. The total void of integrated operational circuitry allowed the engineers to work at higher voltages and with a Class biasing of the intermediate stages. Exclusive circuitry IGBT (Insulated Gate Bipolar Transistor). A Class preamplifier, intermediate stages and drivers. Dual Mono construction featuring four power supplies in Synchro-PWM configuration. Made exclusively with discrete components. Signal switching made exclusively with relays. Fully balanced input circuit. Power supply on separate board to eliminate interference. Dual Power’ function to switch between Hi-Current and Hi-Power. Bias Selector’ function to change the percentage in A Class. High quality crossover module supplied. 5 mm aluminium chassis connecting two side cooling ducts. DUAL MONO CONSTRUCTION Four Synchro-PWM power supplies allow a very fast transient current response and create a Dual Mono configuration. MOSFET-BJT HYBRID CONFIGURATION HV venti employs a unique output power stage topology, discrete IGBT, made by two Hitachi DMOS driving two pairs of complementary Sanken power BJT, each rated for 30A peak current and 200 W dissipation. A-CLASS PREAMPLIFIER AND DRIVER It is made of two groups, Front End pre-amplifier and control unit. The whole stage is balanced up to the driver outputs. The power supply voltage is 90 V and is specific for this stage and dedicated to the two separate channels. The separate 150 V power supply is thermally stabilized and A Class biasing. Input is balanced with the first stage, complementary JFET differential and the second stage, complementary BJT differential. The voltage amplifier is Cascode type with a buffer to drive the output stage. Specification Channels 2 Class A-Class Hi Level Input Yes Low Level Input Yes Digital Input No Power supply voltage / fuse 11 ÷ 16 VDC Idling current 4.2 A Idling current when off 0.006 mA Consumption @ 14.4 VDC, 2Ω, Max Musical Power 90 A Remote IN 7 ÷ 16 VDC – 1 mA Distortion – THD @ 100 Hz, 4Ω, 70% Rated Power <0.05% Bandwidth A (-3 dB, 2 VRMS, 4 Ω): 4Hz ÷ 75 kHz S/N ratio A (A weighed @1 V): 100 dB Damping factor A (1kHz, 4 Ohms): 80 Input sensitivity Pre-In Input sensitivity (high): 0.25 ÷ 1.6 VRMS Input sensitivity (low): 1 ÷ 7 VRMS Total Power RMS 1600 W Output Power (RMS) @14.4 VDC, 1% THD 2 Ch: 400 W x 2 (4Ω) 2 Ch: 800 W x 2 (2Ω) 1 Ch: 900 W x 1 (4Ω) Adjustable Crossover No Input Type Pre IN: L/R (ABS) Filters Outputs Pre OUT (pre in bypass): L/R (ABS) Filter Pass A Crossover frequencies High pass & Low pass stereo 45 – 55 – 65 – 80Hz, 12dB/oct. Filter Pass B Crossover frequencies Lo-pass mono 45 – 55 – 65 – 80Hz, 24dB/oct. Fuse 100 A Other Fucntions Demo mode ext. supply: 12 VDC – 600 mA ; Ext. Cap terminals: 18 VDC cap min Weight 15 kg Dimension A 510 mm Dimension B 85 mm Dimension C 280 mm