I have been looking at a cheap amp with 4k pass through. Was looking at a Yamaha Rx-385, but this has musiccast and network capabilities. Bluetooth and 7.2 channel. Was originally $1,049. Can source at some retailers currently for around $889.
7.2-channel AV receiver supports the latest network functions for an amazing AV experience.
7-channel powerful surround sound
80 W per channel (6 ohms, 20 Hz-20 kHz, 0.09% THD, 2-ch driven)
115 W per channel (6 ohms, 1 kHz, 0.9% THD, 1-ch driven)
145 W per channel (6 ohms, 1 kHz, 10% THD, 1-ch driven)
Ability to add wireless surround speaker/s* (MusicCast 20 or MusicCast 50)
Dolby Atmos® and DTS:X™ support
Amazon Alexa voice control compatibility (*Availability varies by region)
YPAO™ sound optimisation
Music streaming services built-in
HDMI® (4 in / 1 out) with Dolby Vision™ and Hybrid Log-Gamma
Nice price. Yamaha specs page