Harman HK 990 Manuale Utente

4

HK 990

Introduction

Congratulations on your choice of the  harman Kardon

®

 hK 990 Integrated amplifier.

In order to obtain the best performance from this integrated amplifier, please be sure to 

read this owner’s manual and use your integrated amplifier only in accordance with its 

instructions.
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 coaxial 

inputs  or  an  analog-only  signal  path,  as  well  as  fourth-generation  real-time  linear 

smoothing (rls IV), 2.2-channel ezset / eQ

™

 room optimization, dual subwoofer outputs 

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.
the special features of this unit include:

high-current capability to provide the instantaneous current necessary to drive and 

 

control nearly any loudspeaker system precisely
ultrawide-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 for pure analog 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 analog inputs for lower noise levels and higher signal-to-

 

noise performance
rls IV digital-to-analog conversion technology, with dual conversion using two stereo 

 

ad1955 high-grade dacs in dual mono configuration
hrs link for harman Kardon cd players to lock themselves to the external clock of 

 

the  amplifier  for  a  jitter-free  connection,  similar  to  having  cd  playback  inside  the 

amplifier
dual differential input stages with their own high-voltage supply, resulting in high gain 

 

and low noise as well as high channel separation
cascoded predriver stage to reduce high-frequency distortion, allowing crystal-clear 

 

high frequencies, free from any harsh sound
thermal tracking mechanism using thermaltrak

 

™

 output stage transistors that include 

internal temperature sensors to bias the current of the output stage in real time
sophisticated electronic-protection circuitry to guard the amplifier from short-circuit 

 

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 specified 

 

limit at any condition
multiple protection circuits to switch the amplifier off in case overcurrent, overvoltage, 

 

overtemperature or dc protection is detected
dual toroidal transformers and up to 15,000μf of supply filtering per channel for high 

 

channel separation and tight bass control, even with low-impedance loads
dual-line dot-matrix display

 

record out available in both digital and analog domains (two analog outputs and one 

 

coaxial digital output)
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

owner’s manual

 

remote control + 4 aaa batteries

 

ezset microphone

 

power cord