Is this the s660h or the s650h? the title says 660, but then it days "style: avr-s650h". they're different products, so which is it?

They may have just reused the copy in the ad from the 2020 version (AVR-S650H) in making the ad for the 660 and just changing the specs without catching the 650 in the text description.

What is total power output

-Number of Power Amps 5 -Power Output (8 ohm, 20 Hz - 20 kHz, 0.08% 2ch Drive) 75W -Power Output (6 ohm, 1 kHz, 0.7% 2ch Drive) 100W -Power Output (6 ohm, 1 kHz, 10% 1ch Drive) 150W

Can I use 8k inputs for non-8k or even 4k devices?

Yes. The spec is just the maximum allowed at the input

Does it fit Bose Acoustimass 15?

Thanks for your question. AVR-S660H is compatible with Bose Acoustimass 15. World Wide Stereo – since 1979 – and a proud authorized Denon dealer.

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🎬 Elevate your entertainment — 8K clarity meets powerhouse sound!

WIRELESS FREEDOM - Built-in Bluetooth and ARC/eARC support ensure easy, high-quality wireless audio streaming.
CINEMATIC 8 K VISUALS - Experience ultra-crisp 8K video pass-through and upscaling for next-level home theater immersion.
NEXT GEN GAMING READY - Eliminate lag with VRR, Quick Frame Transport, and Auto Low Latency Mode for smooth gameplay.
SEAMLESS SMART CONTROL - Alexa voice compatibility lets you command your entertainment hands-free, effortlessly.
POWERFUL SURROUND SOUND - Feel every detail with 5.2 channels delivering 75 watts per channel of high-fidelity audio clarity.

The Denon AVR-S670H is a 5.2-channel AV receiver delivering 75W per channel with advanced surround sound decoding including Dolby TrueHD and DTS-HD Master Audio. It supports 8K video pass-through and upscaling, HDCP 2.3, and is optimized for gaming with VRR, QFT, and ALLM. Alexa voice control and built-in Bluetooth provide smart, wireless convenience for a premium home theater experience.

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Brand	Denon
Model	AVRS670H
Product Dimensions	33.78 x 43.43 x 15.24 cm; 9.55 kg
Batteries	2 AAA batteries required. (included)
Item model number	AVRS670H
Compatible Devices	Speaker
Special Features	ARC, Built-In Bluetooth, eARC
Audio Encoding	Surround
Audio output mode	Stereo
Audio Output Type	Speakers
Speaker Surround Sound Channel Configuration	5.2
Audio Wattage	75 Watts
Batteries Included	Yes
Batteries Required	Yes
Connector Type	Bluetooth
Media Format	WAV
Does it contain liquid?	No
Includes Rechargeable Battery	No
Item Weight	9 kg 550 g

Denon AVR-S670H 5.2-Channel Receiver (120v)

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