Yamaha rep answering questions on other forum. These might intrest you aswell.
Hi guys thanks for all the interest into our new range. I’d just like to answer a few questions that have come up.
Will the replacement RX-V4A, RX-V6A & RX-A2A
HDMI 2.1 board swap programme include an upgraded 40gbps board? No, the replacement board will deliver the original design specification, that runs at 24gbps across HDMI inputs 1,2 & 3.
Are HDMI 2.1 functions available across all 7 inputs on the RX-A4A, RX-A6A & RX-A8A? Yes, 4K120AB & 8K60AB refresh rates and resolutions apply. ALLM, QFT, QMS, VRR also present. 40gbps transmission.
To further explain the benefits as you work your way up the range, please see the below bullet points, that highlight some of the key improvements:
Improved Build quality
Transformer Isolation
H-Frame (Improved)
Repositioned A.R.T Wedge
Larger Transformer
Transformer Winding (x2 secondary to power amps)
Multi-Layer Pre-amp PCB
Larger Block Capacitors
WIMA Film Capacitors (used on power amps)
More Powerful Amps
Symmetrical Design
Sabre DAC
Qualcomm S.O.C
Surround: AI
YPAO: LFM, 3D, High Precision
Backlit Remote
Improved Scene Control +
Improved GUI
More Inputs / Outputs
More Power
Larger Transformer
Larger Block Capacitors
Better DACS
Iron Feet
Double Bottom Plate
11ch Processing
Auro 3D (9.1 & 11.1 with 2ch amp)
Zone 4 (HDMI)
XLR In & Out
HDMI Video Presets
11ch Amplification
Complete Transformer Isolation
Thicker Double Bottom Plate
Brass 5th Foot
Two Sabre Pro DACS (the same as CX-A5200)
Heavier gauge copper tracked power amp & analogue PCB’s (the same as MX-A5200)
Heavier gauge power supply and ground wiring (the same as MX-A5200)
Larger Block Capacitors
Sadly, these bullet points do not and cannot tell you the real-world sonic benefits. This can only be understood with an audition.
To sum up the new models in a few words, I would say:
RX-A4A Detail & Precision
RX-A6A Deep & Refined
RX-A8A Amazing Grip & Control