The RX-A2080 and RX-A2070 have a power output of 140 Watts per channel whereas the RX-A1080 and RX-A1070: 110 Watts per channel (2-channel driven into 8-ohm loads, 20Hz-20kHz, 0.06% THD in both instances). Even though you can connect 2 more speakers than any of them is able to internally power, it should be said that the number of speaker terminals and power amplification channels is not the same on the four Yamaha receivers. The RX-A2080 and RX-A2070 have 11 speaker terminals (of which 9 are powered simultaneously). In contrast, there are 9 terminals (and 7 poweramps) on the RX-A1080 and RX-A1070. What they all have in common, though, is that there are only 7.2-channel pre-outs for the Main room, meaning that you cannot use an external amplifier to expand a Dolby Atmos setup beyond what they are internally able to drive. In case of the RX-A1080 and RX-A1070, it's either a 5.1.2 Dolby Atmos configuration, or a traditional 7.1-channel speaker layout, because the front presence and surround back speakers cannot be powered at the same time. In contrast, the RX-A2080 and RX-A2070 have the built-in amplification to drive up to a 7.1.2-channel system. While there are Zone2 stereo pre-outs on either one of the four Yamaha receivers, only the RX-A2080 and RX-A2070 have dedicated stereo pre-outs for Zone3.
There are a total of 3 HDMI outputs on the RX-A2080 and RX-A1080, so these two Yamaha receivers have one additional HDMI output in comparison to the RX-A2070 and RX-A1070 which have only 2 HDMI outputs. That being said, the RX-A2070 and RX-A1070 have 8 HDMI inputs (7 rear and 1 front) whereas the RX-A2080 and RX-A1080 omit the front input, meaning that they only have the 7 rear HDMI inputs. There is a firmware update available for either one of the four receivers that enables eARC (enhanced Audio Return Channel) on one of their HDMI outputs. The RX-A1070 and RX-A2070 also need a firmware update in order to pass-through Dolby Vision and HLG (Hybrid Log-Gamma) formats of HDR content while the RX-A1080 and RX-A2080 have that ability out of the box. HDR10 pass-trough is natively supported on all of them, though. According to Yamaha, the four receivers are compatible with HDCP 2.3 (despite their HDMI terminals being labeled as HDCP 2.2 - although this may vary depending on the manufacturing date).
The RX-A1080 and RX-A1070 have a single DAC whereas the the RX-A2080 and RX-A2070 utilize dual DACs. The specific model used on the RX-A1080 and the RX-A2080 is the ESS SABRE ES9007S (the RX-A1080 has one whereas the RX-A2080: two). The RX-A1070 and RX-A2070, on the other hand, use the ESS SABRE 9006AS (the RX-A1070 has one vs two on the RX-A2070). Both the ES9007S and 9006AS have a dynamic range of up to 120 dB, though. The RX-A1080 and RX-A2080 are able to handle DSD files with up to 11.2 MHz sampling rate, whereas the RX-A1070 and RX-A2070's DSD play back capabilities are limited up to 5.6 MHz.
The YPAO (Yamaha Parametric room Acoustic Optimization) with R.S.C. (Reflected Sound Control) is used by either of the four Yamaha receivers for providing automatic speaker equalization based on their characteristics as well as the room acoustics. That being said, the RX-A1070 and RX-A2070 use 64-bit Precision EQ calculation which gives them an advantage over the RX-A1080 and RX-A2080's standard Precision EQ calculation in how accurately they can correct acoustics issues. The ability to detect these issues, however, is identical on the four Yamaha receivers since they support multi measurement at up to 8 different listening positions. Only the RX-A2070 and RX-A2080 have the ability to measure the angle of the front, surround, and presence speakers, as well as the height of the presence speakers. This is done in order for the sound programs utilizing the Yamaha's Cinema DSP HD3 technology to be able to recreate stereoscopic sound effects more accurately, so that they resemble those in a movie theater or a concert hall. Furthermore, Dolby Atmos and DTS:X can also benefit from the YPAO 3D measurement and adjustment.
There is a firmware update available for the RX-A1080 and RX-A2080 which brings Amazon Music (in all supported regions) and enhanced Alexa voice control (initially for US/Canada and in English only but latter other regions and languages will be supported, according to Yamaha). This update is not available for the RX-A1070 and RX-A2070, meaning that only some basic functions can be controlled via Alexa on these two receivers, as opposed to different streaming services, for example. In case you own an Alexa device (e.g. Amazon Echo, Amazon Dot, etc., which are sold separately), and have enabled the MusicCast Smart Home skill in the Amazon Alexa app (prior to that, some configuration needs to be performed in the MusicCast Controller app), then you can use voice interactions with streaming services such as Amazon Music, Pandora, Deezer, Gimme Radio and SiriusXM (support may vary by region), provided the RX-A1080 or RX-A2080 are connected to the same Wi-Fi network as the Alexa device. The RX-A1080 and RX-A2080 will also support Apple Airplay 2 via firmware update whereas the RX-A1070 and RX-A2070 are left supporting only the original Airplay technology. If you have an iOS device such as iPhone or iPad, then you will be able to use Siri for voice control, as well as to stream Apple Music not only to the RX-A1080 and RX-A2080 but also to other MusicCast devices. Speaking of which, the RX-A1080 and RX-A2080 are compatible with wireless MusicCast Surround speakers (MusicCast 20 or MusicCast 50), in addition to MusicCast SUB 100, which is a wireless subwoofer (all of them are sold separately). The RX-A1070 and RX-A2070, on the other hand, are not compatible with MusicCast wireless speakers or subwoofer.
Check availability and pricing on Amazon.com for the Yamaha RX-A2080, RX-A1080, RX-A2070 or RX-A1070 (affiliate links; As an Amazon Associate I earn from qualifying purchases.)
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