Specifications:

In terms of raw power, the HK 990 is the most muscular amplifier ever to carry the Harman Kardon® name, more than capable of driving the most demanding loudspeaker loads without breaking a sweat. But the HK 990’s awesome power is nothing if not highly refined, extending beyond watts and amps. With a choice of discrete optical or digital inputs or an analogue-only signal path, as well as fourth-generation Real-Time Linear Smoothing (RLS IV), 2.2-channel EzSet/EQ room optimization, dual subwoofer outputs, USB connectivity and an audiophile-quality phono preamp section, the HK 990 offers a combination of features you will find irresistible. Others, of course, may simply hunger for all that power. We understand completely.

FEATURES:

• 150W x 2 into 8 ohms, 20Hz – 20kHz, at <0.07% THD, with all channels driven simultaneously
• High-current (±100 amps), ultrawide-bandwidth (10Hz – 100kHz) amplifier design
• Six analogue stereo audio inputs
• Two analogue recording outputs
• Four digital inputs (two optical and two coaxial)
• One USB input for playback of audio files stored on a PC
• Dual subwoofer outputs to connect up to two active subwoofers
• One coaxial digital output for recording
• Two real balanced inputs, using XLR connectors
• One HRS (high-resolution synchronization) link
• 2.2-Channel processor input allows the use of external audio processors
• Two high-quality phono inputs for connection of record players with an MM or MC cartridge
• 2.2 Preamp outputs allow the use of external power amplifiers
• Remote control input and output
• Heavy-duty binding posts allow for the use of speaker cables up to 10mm2
• Headphone output
• High Current Capability provides the instantaneous current necessary to precisely drive and control nearly any loudspeaker system
• Ultra wide-bandwidth amplifier design for improved transient accuracy and phase linearity
• Low negative feedback for further improved dynamic accuracy
• Use of discrete electronic circuitry to provide the highest performance level
• Dual-path technology allows for pure analogue or pure digital audio processing within the same product
• EzSet/EQ room optimization for quick and accurate system setup, optimized for two channels and two subwoofers
• Symmetric (balanced) XLR analogue inputs offer lower noise levels and higher Signal-to-Noise performance
• RLS IV digital-to-analogue conversion technology, with dual conversion using two stereo AD1955 high-grade DACs
• The HRS link allows Harman Kardon CD players to lock themselves to the external clock of the amplifier for a jitter-free connection, similar to having the CD playback inside the amplifier
• Dual differential input stages with their own high-voltage supply, resulting in high gain and low noise
• Cascoded predriver stage considerably reduces high-frequency distortion, allowing crystal-clear high frequencies, free from any harsh sound
• Thermal Tracking Mechanism using ThermalTrakTM output stage transistors that include internal temperature sensors to bias the current of the output stage in real time
• Sophisticated electronic protection circuitry guards the amplifier from short-circuiting or from damaged speakers and wires, without impairing sound quality, by using current-limiting or output relays
• DC servo to ensure that the DC level of the amplifier output will stay within a contained limit at any condition
• Multiple protection circuits will switch the amplifier off in case overcurrent, overvoltage, overtemperature or DC protection is detected
• Dual toroidal transformers and up to 16.000µF of supply filtering per channel will allow high channel separation and tight bass control, even with a low-impedance load
• Dual-line dot-matrix display
• Record out available in both digital and analogue domains (two analogue outputs and one coaxial digital output)
• Remote A/B speaker switching
• IR remote extension jacks for control of the amplifier when placed in a cabinet
• Harman Kardon system remote for control of compatible Harman Kardon CD players and tuners