Onkyo TX NR676 Home Theatre Receiver Review

Onkyo TX-NR676 Home Theater Receiver – Review

Onkyo, a legendary name in the audio world, has been dedicated to crafting high-fidelity sound equipment since 1946. Over the decades, the Japanese brand has earned a solid reputation for delivering premium sound quality, with many of its products receiving international acclaim and awards.

Now, let’s take a closer look at what the TX-NR676 home theater receiver brings to the table—and what lies under the hood of this feature-packed AV solution.

Design Philosophy and Internal Configuration

The Onkyo TX-NR676 is a 7.2-channel home theater receiver, and in terms of appearance, it closely resembles its predecessors. This isn’t unusual—many high-end audio manufacturers, including Onkyo, tend to reuse proven housing designs across model generations. The emphasis is less on external innovation and more on advancing internal technologies.

This approach reflects a wider trend in the audio industry: as product design has matured, there is less room for visual reinvention, and more focus is placed on improving performance under the hood. In the case of the TX-NR676, the familiar casing conceals cutting-edge audio circuitry and features, optimized for enhanced fidelity and precision.

The result is a receiver that may look familiar on the outside but delivers notably improved sound processing and compatibility, keeping pace with modern home theater demands while maintaining the trusted Onkyo aesthetic.

Front Panel & Usability

The Onkyo TX-NR676 features a square, functional design with a layout that prioritizes ease of use. The front display is clear and highly legible—even from a distance—making it easy to check source selection and volume levels at a glance.

Beneath the display are the input selection buttons, conveniently arranged for quick source switching. On the right side of the front panel, you’ll find a prominently sized volume knob, offering precise control and a solid, tactile feel.

All major connectivity options are located on the rear panel, which helps maintain a clean front appearance—but also introduces a practical inconvenience. Notably, the USB input is placed on the back, which is less user-friendly. A front-mounted USB port would have provided easier access for portable drives or streaming devices, especially for users who frequently plug and unplug media.

Despite this small design oversight, the overall build remains solid and intuitive, consistent with Onkyo’s commitment to quality and user-centric engineering.

It has seven HDMI inputs, one of which is on the front panel. The HDMI inputs can also convert 4K / 60hz UHD signals and are HDCP 2.2, BT 2020, HDR10 and Dolby Vision compatible. 2 optical, 1 coaxial, 2 composite video, 2 component video, 6 stereo RCA inputs and 1 Phono input can also be discovered on the back. Thanks to the Phono input, lovers of vinyl records can also be satisfied. We noted sadly that the Onkyo home theatre amplifier is missing the 12-volt Trigger output. There is no shortage of outputs though: 2 HDMI outputs, 9 speaker outputs, 2 subwoofer outputs, 1 headphone output, a Zone 2 output, and in addition to these there is a LAN connector and a plug for an FM / AM antenna. The TX NR676 weighs 10 kg and measures 435 x 173.5 x 378 cm. Connectors are arranged ergonomically. The frequency transmission of the amplifier is between 10 Hz and 100 kHz.

The remote control is absolutely handy, yet a bit small, which unfortunately requires the buttons to be tiny. It does not have a backlight.

 

Other features of Onkyo TX NR676 home theatre amplifier

The Cirrus Logic home cinema amplifier decodes with a quad-core, 32-bit, CS49844 DAC chip, supporting Dolby Atmos, DTS: X, DSD formats for SACD discs and, of course, previous Dolby and DTS audio, as well as 192 kHz / 24 bit file formats as well. (FLAC, WAV, AIFF, ALAC)

Low-impedance -4-ohm speakers can also be powered by this amplifier. At one channel load, the power for a 150-watt 6-ohm speaker was estimated by the manufacturer to be slightly lagging behind the amplifier, because in reality, contrary to the manufacturer’s claim, for 4-ohm speakers, we can expect 80-120 watts of power with low distortion. The FireConnect system is very useful, which can also be used for integration with a multiroom system. By downloading the Onkyo Controller application, the system can also be controlled via mobile devices. Of course, as with other home theatre amplifiers in similar categories, streaming is possible here, making TIDAL, Pandora, Deezer or Tuneln radio available. Airplay and Bluetooth, as well as Wifi connectivity, are available, and Chromecast or DTS PlayFi are available after a software update.

Room Calibration & Audio Enhancement Features

One of the most pleasant surprises in this price category is the inclusion of the AccuEQ room acoustic calibration system. Onkyo’s AccuEQ offers a 15-band equalizer with multiple configuration options, allowing for precise tailoring of the sound to your specific room characteristics. Impressively, the system can store up to three user presets, making it easy to switch between setups for different listening scenarios.

Even more unexpectedly, the receiver supports NTFS-formatted storage devices, which is rarely seen at this level and greatly improves playback versatility for users with larger media libraries.

The Music Optimizer feature is designed to restore depth and clarity to compressed digital audio formats, such as MP3s. However, in our testing, it also brought noticeable improvements to vinyl playback, enhancing clarity and boosting bass response—a welcome bonus for analog enthusiasts.

Additionally, the Vector Linear Shaping Circuitry (VLSC) is Onkyo’s proprietary solution for reducing pulse noise. This feature works by smoothing the digital-to-analog signal path, resulting in cleaner, more natural audio reproduction, particularly in high-frequency ranges.

Test

We first tested the Onkyo receiver while listening to music, pairing it with a pair of Focal Chora 826 stationary speakers and a Velodyne Digital Drive Plus18 subwoofer. We kicked off the sound testing with the Green Day band’s song 21 Guns. The amp sounded dynamic and vivid, we experienced strong, definite deep and mid ranges, the deep tones were precise and directional, we found that Onkyo performed correctly at all volume levels. This was followed by The Weekend False Alarm, and our assessment remained unchanged. Detailed sound and a wide stage picture could be obtained, and at low or higher volumes, the amplifier’s sound production was clear with low level of distortion.

After listening to music, we also tested the device while watching a movie. We first screened the movie J. Edgar, which was released in 2011. We didn’t have a serious complaint about the performance of the amplifier this time either, the dialogues were understandable, although at higher volume we lacked detail at the peaks. We then continued the testing of the Onkyo receiver with the 2018 movie Extinction. The surround sound was stunning, as was the dynamics and momentum, the bass we felt a little overly accentuated at first, we were able to make small subtle changes with the AccuEQ settings on the receiver, which made the sounds even more accurate and even more beautiful.

Of course, a room acoustic enhancement software is only useful if the acoustics of the room are already adequate. To do this, it is recommended to place acoustic panels on the walls and ceiling. We can achieve the best sound if we use not only sound-absorbing elements, but also diffuser panels. Acoustic treatment was not yet complete at our test site, printed wall panels on the walls were placed, but based on our measurements, diffusers and corner bass traps will also be required.

Conclusion

Final Verdict – Onkyo TX-NR676 Home Theater Receiver

The Onkyo TX-NR676 stands out as an excellent receiver in its price category. It delivers solid surround sound, with satisfying momentum, clarity, and feature richness—surpassing even some more expensive models we’ve tested in terms of functionality and versatility.

While not part of the ultra-premium tier, this model is equipped with nearly all modern AV technologies, making it a compelling all-rounder for home cinema setups. Features like AccuEQ calibration, Music Optimizer, NTFS support, and VLSC noise reduction elevate its value significantly.

That said, the receiver isn’t without minor shortcomings. While sound quality was generally clear and enjoyable at all volume levels, we found that dynamics and peak detail could benefit from refinement. Bass sometimes felt a bit overbearing, but this could be successfully tamed with proper EQ adjustments using the room calibration system.

One ergonomic critique: the remote control would greatly benefit from backlighting, especially for use in darkened cinema rooms. The buttons are also on the smaller side, which affects usability in low light.

All in all, the TX-NR676 delivers precise imaging, full-bodied depth, and reliable performance, making it an ideal option for home theater enthusiasts seeking high-value audio gear with modern capabilities—without stretching into high-end pricing territory.