Onkyo TX NR676 home theater receiver review

The Onkyo audio and hi-fi brand has been striving to produce products with perfect sound quality since 1946. It can be said that they are quite successful in this, as evidenced by their many award-winning products.

Let’s get to know the TX NR676 home theater receiver!

Onkyo-TX-NR676-amplifier 1.

The amplifier has a 7.2 system and is virtually no different in appearance from previous Onkyo home theater amplifier models. In recent years, it has also been observed for other brands that produce audio and hi-fi products that more advanced, more modern technology is placed in the same device housing as previous models. The main reason for this is probably that even significant changes in terms of design cannot be achieved anymore, but the technology is constantly evolving, so the emphasis is on using the most up-to-date technologies possible for perfect and even more professional sound quality. This amplifier has a square, practical design, the display can be seen from a greater distance, and below it are the input selection buttons. There is a slightly oversized volume control on the right side of the front panel and the connections are on the back. In the case of the USB input, this is a rather awkward layout, it would have been better if the USB connection was located on the front panel.

TX-NR-676-back panel

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 theater amplifier is missing the 12-volt Trigger output. There is no shortage of outputs, 2 HDMI outputs, 9 speaker outputs, 2 subwoofer outputs, 1 headphone output, a Zone 2 output, a LAN connector and an FM / AM antenna. The TX NR676 weighs 10 kg and measures 435 x 173.5 x 378 cm. Connectors are arranged transparently. The frequency transmission of the amplifier is between 10 Hz and 100 kHz.

TX-NR-676-remote control

The remote control is absolutely handy, small, but unfortunately this makes the buttons too small and does not have a backlight.

Other features of Onkyo TX NR676 home theater 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)

Onkyo-TX-NR676-receiver inside

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 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 theater 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.


What was a pleasant surprise for us in this price range is the AccuEQ room acoustic calibration system, which offers a 15-band, multi-setting option, can store three user settings in its memory, and also recognizes NTFS formats, which was also a pleasant surprise.

The amplifier has a Music Optimizer function, which is primarily designed to enhance the quality of compressed digital songs, but based on our experience and during the rehearsal, it also improved the clarity of the sounds and amplified the bass when playing vinyl records. And Onkyo’s Vector Linear Shaping Circuitry (VLSC) feature reduces pulse noise.


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 music rehearsal with the Green Day band’s song 21 Guns. The amp sounded dynamic, dynamic, we experienced strong, definite deep and mid ranges, the deep ones were precise and directional, we found that Onkyo lived correctly at all volume levels. This was followed by The Weekend Fales Alarm, where we can report similar experiences. Detailed sound and a wide stage picture were obtained, and at low volume and higher volume, the amplifier’s production was characterized by clear and low distortion sound.

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 rehearsal 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 correction program is only useful if the acoustics of the room are 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 the measurements, diffusers and corner bass traps will also be required.


TX-NR676-receiver front panel

The TX NR676 home theater receiver is a very good device in this price range. The surround sound, momentum and clarity were adequate. We’ve also tested much more expensive home theater amps that had fewer features or performed less well. This model of the Onkyo, although not in the premium high-end category, is equipped with almost all modern technologies and features. The dynamics and strength still need to be improved, it could be better, and we sometimes felt a little too restrained to sound. In the case of the remote control, it would be good to get a backlight, since in a dark cinema room it is advantageous to see the buttons on the remote control, which have been very small anyway. At all volumes it sounded nice and clear, at higher volumes we lacked detail at the peaks, and the bass sounds might sometimes seem too intrusive at first, so here we needed to fine-tune the room calibration system to eliminate them. Otherwise, the receiver produced precise and directed depths.

Written by Róbert Polgár