Onkyo TX-NR5100 Hi-Fi AV Receiver

7.2-Channel 8K AV Receiver for Movies, Gaming, and Music

The Onkyo TX-NR5100 anchors a modern home theater with HDMI 2.1, 8K/60 and 4K/120 video passthrough, and immersive Dolby Atmos and DTS:X decoding. A custom High-Current Low-Noise Power Transformer and discrete two-stage amplifier topology deliver 80 watts per channel into 8 ohms while driving 4-ohm loads across all seven channels. Smart-home integration covers Apple AirPlay 2, Chromecast built-in, Alexa, Hey Google, and Siri, and the receiver carries Works with Sonos certification. This 7.2-channel AV receiver is the right choice for home theater builders who want HDMI 2.1, immersive audio, and multi-room streaming in a single component.

What Sets This Receiver Apart

Klipsch Optimize Mode loads precise crossover values for Klipsch Reference and Reference Premiere speakers directly into the AccuEQ calibration, removing manual crossover tuning for matched systems. Dynamic Audio Amplification pairs a custom High-Current Low-Noise Power Transformer with isolated network circuitry to keep high-frequency digital noise away from the analog audio path. Works with Sonos Certified wakes the unit, switches inputs, and adjusts volume through the Sonos app when paired with a Sonos Port.

Amplifier Power and Signal Purity

Dynamic Audio Amplification drives 4-ohm loads through all seven channels with a discrete two-stage output stage and a custom transformer. A 106 dB signal-to-noise ratio and 192 kHz/24-bit D/A conversion preserve detail in Hi-Res Audio sources, while PLL anti-jitter technology cleans up SPDIF inputs.

• Power Output: 80 W/Ch (8 ohms, 20 Hz–20 kHz, 0.08% THD, 2-ch driven, FTC) — FTC-rated power into 8 ohms with two channels driven
• THD+N: 0.08% (20 Hz–20 kHz)
• Signal-to-Noise Ratio: 106 dB (Line, IHF-A) — quiet background for music and movie playback
• Speaker Impedance: 4–16 ohms — drives 4-ohm loads through all seven channels

HDMI 2.1 with 8K and Gaming-Grade Video

Four HDMI 2.1 inputs and two outputs handle 8K/60, 4K/120, HDR10+, Dolby Vision, HDR10, HLG, and BT.2020 color. Variable Refresh Rate, Auto Low Latency Mode, and Quick Frame Transport reduce lag and tearing on compatible consoles and PCs, while 1080p-to-4K upscaling cleans up legacy sources.

• HDMI Inputs/Outputs: 4 in / 2 out (Main [eARC], Sub Out)
• Video Passthrough: 8K/60, 4K/120, HDR10+, Dolby Vision, HDR10, HLG, BT.2020 — covers next-gen gaming and high dynamic range content
• Gaming Features: VRR, ALLM, QFT, HDCP 2.3 — reduces lag and screen tearing on compatible consoles

Immersive Audio, Hi-Res Playback, and Streaming

5.2.2-channel Dolby Atmos and DTS:X playback handles overhead effects, while Dolby Atmos Height Virtualizer simulates height channels from a conventional 7.1 layout. Hi-Res Audio covers DSD256 and 192 kHz/24-bit FLAC, ALAC, WAV, and AIFF. Built-in streaming includes Spotify, TIDAL, Deezer, TuneIn, and Pandora, with multi-room audio through DTS Play-Fi, AirPlay 2, Chromecast, and Works with Sonos.

• Immersive Decoding: Dolby Atmos, DTS:X, Dolby Atmos Height Virtualizer, DTS Virtual:X
• Hi-Res Audio: DSD256, 192 kHz/24-bit FLAC, ALAC, WAV, AIFF — studio-master-quality playback over network and USB
• Wireless Streaming: Wi-Fi 5 GHz/2.4 GHz (802.11ac), Bluetooth (aptX HD TX), AirPlay 2, Chromecast, DTS Play-Fi

The Right Fit for Modern Home Theater Builders

This 7.2-channel AV receiver suits home theater enthusiasts who want HDMI 2.1 passthrough for a PlayStation 5, Xbox Series X, or a high-end PC, paired with Dolby Atmos for Blu-ray and streaming movies. Music-first listeners get Roon Tested certification, Hi-Res Audio over network, and multi-room playback through Sonos, AirPlay 2, or Chromecast. Klipsch Reference and Reference Premiere owners benefit from a built-in Optimize Mode that loads the correct crossover values automatically. Gamers gain VRR, ALLM, and 4K/120 support for smooth, tear-free motion.

Onkyo's 70-Year Amplifier Heritage

Onkyo's Dynamic Audio Amplification platform has been refined over 70 years to deliver emotion in high fidelity, pairing a custom High-Current Low-Noise Power Transformer with discrete amp output stages and an isolated network module. This entry-level AVR sits at the bottom of the brand's 2021 lineup, below the TX-NR6100, TX-NR7100, and the flagship TX-RZ50, bringing HDMI 2.1, 8K support, and Works with Sonos certification to a more accessible price tier.