Onkyo TX-SR373 comes with 4 HDMI inputs. It has 1 output.
Onkyo TX-NR737 comes with 7 HDMI inputs. It has 2 outputs which work parallelly and output the same signal.
- 4K/60Hz Passthrough: On both receivers all inputs pass up to 4K/60p (4:4:4) video signal.
- 4K Upscaling on Onkyo TX-NR737: It can upscale up to 4K/30p (Marvell Qdeo) from HDMI and analog sources.
- Analog To HDMI Upconversion: Onkyo TX-NR737 supports analog to HDMI Upconversion, so you can input your analog video sources and output them digitally via HDMI. This means that you will need only one HDMI cable to connect to your TV.
- BT.2020 Color Space: BT.2020 or Rec. 2020 is a color standard which delivers a wider color gamut compared to Rec. 709. It covers approximately 75% of the total visual spectrum while the Rec. 709 covers only 35% (available on Onkyo TX-SR373 only).
- HDCP 2.2 Copy Protection: Both receivers are HDCP 2.2 compliant which is a requirement for 4K/HDR copy-protected content transmission.
- 3D Ready: Both receivers are able to pass 3D video through HDMI.
HDR (High Dynamic Range)
Onkyo TX-SR373 supports HDR10 and Dolby Vision.
Onkyo TX-NR737 does not support HDR.
High dynamic range video has greater dynamic range than standard dynamic range (SDR) video with brighter whites and deeper blacks. The result is greater contrast and more details in dark and bright areas, better color and depth.
- HDR10: HDR10 uses the wide-gamut Rec. 2020 color space. It sends static metadata via video stream to the TV which calibrates its screen brightness and color according to that. HDR10 supports 10-bit color which corresponds to 1024 shades of the primary RGB colors. It is technically limited to a maximum of 10,000 nits peak brightness, however common HDR10 contents are mastered with peak brightness from 1,000 to 4,000 nits.
- Dolby Vision: Dolby Vision is a set of technologies developed by Dolby Laboratories for high dynamic range (HDR) video. It covers content creation, distribution, and playback. Like HDR10+, it includes dynamic metadata that are used to adjust and optimize each frame of the HDR video to the consumer display's capabilities in a way specified by the content creator. Dolby Vision allows for a maximum resolution of 8K up to 12-bit color depth, maximum peak brightness of 10,000 nits and a color gamut up to Rec. 2020. It uses Dolby's proprietary dynamic metadata defined in SMPTE ST 2094-10.
| VIDEO FEATURES | Onkyo TX-SR373 | Onkyo TX-NR737 |
|---|---|---|
| HDR10 | ||
| HDR10+ | ||
| Dynamic HDR | ||
| BT.2020 color space | ||
| Dolby Vision | ||
| HLG (Hybrid Log Gamma) | ||
| HDBaseT Compatible | ||
| Enhanced Audio Return Channel (eARC) | ||
| HDCP Version | 2.2 | 2.2 |
| QMS (Quick Media Switching) | ||
| ALLM (Auto Low Latency Mode) | ||
| VRR (Variable Refresh Rate) | ||
| QFT (Quick Frame transport) | ||
| 3-D Ready | ||
| Video Signal Passthrough | up to 4K/60p (4:4:4) | up to 4K/60p (YCbCr 4:2:0) |
| Video Signal Upscaling | up to 4K/30p (Marvell Qdeo) |