Onkyo TX-NR5100

Released in 2021 as part of Onkyo’s new line of 8K-compatible amplifiers, the TX-NR5100 is the gateway to modern home theater. This 7.2-channel model combines the latest technological advances with an accessible price point, all while preserving the sonic DNA that has built Onkyo’s reputation since 1946.

Technical Architecture and Sound Design

The TX-NR5100 is built on a discrete component amplification architecture, capable of driving 4-ohm loads across all 7 channels. At its core, a custom toroidal transformer ensures stable power delivery, complemented by an isolated network module that minimizes high-frequency interference.

With 80 watts per channel (8 ohms, THD 0.08%), it offers substantial dynamic reserves, reaching 165 watts at 6 ohms. This “Dynamic Audio Amplification” architecture prioritizes transient response, which is especially noticeable during explosive moments in modern soundtracks. Digital processing relies on 192 kHz/24-bit converters and anti-jitter PLL technology, with native support for DSD up to 11.2 MHz.

Next-Generation Video and Gaming Capabilities

HDMI 2.1 integration is the main highlight, though the 24 Gbps bandwidth does require some compromises. All four inputs accept 4K/120Hz and 8K/60Hz signals, but without HDR at 4K/120Hz—a limitation for owners of the latest gaming consoles.

The amp includes essential gaming features: VRR to prevent screen tearing, ALLM for automatic low latency, and QFT to reduce display lag. HDR support covers Dolby Vision, HDR10+, and HLG with BT.2020 colorimetry. Dual HDMI outputs allow simultaneous connection to both a TV and a projector.

Connectivity and Multiroom Integration

Compatible with major ecosystems (Sonos, Chromecast, AirPlay 2, DTS Play-Fi), the TX-NR5100 fits seamlessly into a multiroom setup. Dual-band Wi-Fi enables high-resolution streaming, with Spotify Connect, Amazon Music HD, Tidal, and Deezer built in. Bidirectional aptX HD Bluetooth allows streaming from a smartphone or to wireless headphones.

Physical connections include three RCA line inputs, one optical, and one coaxial input. The Zone 2 output can power an additional room, either via reassigned surround channels or through a line output.

Acoustic Calibration and Optimization

The AccuEQ system with AccuReflex calculates distances, levels, and crossover frequencies for each speaker. While less sophisticated than Dirac Live, it fulfills its primary purpose. The Klipsch Optimize mode automatically applies optimal settings for speakers from the American brand.

Dolby Atmos Height Virtualizer and DTS Virtual:X technologies simulate height effects without dedicated speakers. While the result doesn’t replace true physical channels, the sense of spaciousness is still noticeable in 5.1 or 7.1 setups.

Technical Specifications

Architecture and Audio Performance

• Discrete 2-stage power amplifier
• Custom high-current, low-noise power transformer
• Isolated network module reducing high-frequency interference
• 4 Ω load driving capability on 7 channels
• 192 kHz / 24-bit digital-to-analog converter (DAC) for high-resolution audio
• PLL anti-jitter technology for S/PDIF audio
• Tone controls (bass, treble) for left and right front channels
• Output power:
  • 160 W / channel (6 Ω, 1 kHz, 10% THD, 1 channel driven)
  • 135 W / channel (6 Ω, 1 kHz, 1% THD, 1 channel driven, IEC)
• Total harmonic distortion: 0.08% (20 Hz - 20 kHz)
• Input sensitivity: 200 mV RMS
• Frequency response: 10 Hz - 100 kHz
• Signal-to-noise ratio: 106 dB
• Compatible impedances: 4 to 16 Ω

Supported Audio Formats

• Stereo: MP3, AAC, WMA, WAV, AIFF, FLAC, ALAC, DSD
• Multichannel: Dolby Atmos, Dolby Atmos Height Virtualization, DTS:X, DTS Neural:X, DTS Virtual:X, Dolby TrueHD, DTS-HD Master Audio

Connectivity

• 4 HDMI 2.1 inputs (4K 120 Hz, 8K 60 Hz)
• 2 HDMI 2.1 outputs
• 1 S/PDIF Toslink optical input
• 1 S/PDIF RCA coaxial input
• 3 RCA stereo line inputs
• 1 RCA zone 2 output
• 1 RJ-45 port
• FM and AM antenna jacks
• 1 x 6.35 mm headphone output (front panel)
• 1 calibration microphone input (front panel)
• 2 USB Type-A ports

Services and Features

• Compatible with Amazon Music, Deezer, Spotify, Tidal
• Bidirectional Bluetooth controller
• Compatible with Alexa, Siri, Google Assistant

Physical Characteristics

• Power consumption:
  • Maximum: 490 W
  • Standby: 0.1 W
• Dimensions (W × H × D): 435 × 160 × 328 mm
• Weight: 8.4 kg
• Included accessories: radio antenna, calibration microphone, remote control