Harmon Kardon 990 150W Flagship High Power Integrated Amplifier Balanced Inputs

🔊 Overview

• Type: Solid-state stereo integrated amplifier

• Channels: 2.2-channel integrated amplifier (dual subwoofer capability)

• Amplifier Class: Class AB, high-current design

• Era: Approx. 2009–2012 flagship stereo amplifier

• Designed as Harman Kardon’s most powerful audiophile integrated amp

⚙️ Power & Amplification

• Power Output:

  • 150W per channel (8Ω)

  • 300W per channel (4Ω)

• Dynamic Power:

  • 220W (8Ω)

  • 440W (4Ω)

• High Instantaneous Current Capability: up to ±200A

• Damping Factor: >200

• High-current wide-bandwidth amplifier topology

📊 Audio Performance

• Frequency Response: approx. 5Hz – 120kHz

• Total Harmonic Distortion (THD): <0.03%

• Signal-to-Noise Ratio:

  • Line level: ~100 dB

  • MC phono: ~75 dB

• Ultra-wide bandwidth low-feedback design

🎛 Inputs & Connectivity

Analog Inputs

• Multiple RCA line inputs

• 1 × Balanced XLR input

• Phono input (MM & MC supported)

• Processor / HT bypass input

Digital Inputs

• 2 × Optical

• 2 × Coaxial

• HRS proprietary digital link

Outputs

• Dual subwoofer outputs

• Pre-out / record outputs

• Digital coax output

• Dual speaker terminals (A/B)

💻 Digital & Processing Features

• Dual-mono AD1955 DACs

• 24-bit digital processing

• Real-Time Linear Smoothing (RLS IV)

• EzSet/EQ room correction system

• Built-in bass management

• Analog and digital signal paths selectable

🏗 Build & Physical

• Dimensions: 440 × 160 × 444 mm

• Weight: ~24 kg

• Heavy dual-mono internal construction

• Front panel display with touch controls

• Included calibration microphone for auto EQ

⭐ Key Highlights

• Extremely high current delivery — drives difficult speakers easily

• Integrated DAC + phono stage in one chassis

• Room correction rare in stereo amplifiers

• Studio-grade connectivity including balanced inputs

• Designed as a complete audiophile control center

The Harman Kardon HK 990 is a rare integrated amplifier that combines brute power with advanced digital intelligence. Built during a period when stereo amplifiers began merging traditional analog performance with modern processing, it delivers exceptional control, authority, and versatility in a single chassis. With massive current capability, built-in room correction, high-quality DAC architecture, and full analog flexibility, the HK 990 functions less like a conventional integrated amp and more like a complete high-performance audio command center — capable of driving demanding speakers while maintaining precision, scale, and musical impact.