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