What class is this amplifier? A previous answer says class a/b but the description says class D...

It is a Class A B amplifier, definitely not Class D. It likely has a digital switching circuit in there somehow but the outputs sections are old-fashioned boat anchor type. If it was a Class D digital amplifier you'd have all that power and about a quarter of the weight.

im Trying to power 6 speakers in 3 zones in a restaurant. Can this unit play to all zones at the same time or is it only 1 zone at a time powered?

Yes, this unit can play to all zones at the same time.

What class is this amplifier? class a/b, class d?

Hello! This amplifier is class a/b.

I have six different rooms with speakers wired. Can I use this to power and turn on/off rooms? I.e. kitchen and living room on and dining room off?

The six zones, or 12 channels, share a common power supply and turn-on method either manually switched (on the front), auto sensing, or from a 12-volt trigger (hard wired). You can select a common source (1 or 2) or connect an independent source per channel or zone but you are restricted to the turn-on option you select for all. Your best bet would be to use in-wall volume controls.

Osd Audio Nero Max 12 Channel Multi Room Amplifier 6

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Description

🎶 Elevate every space with sound that moves you—control it all in the palm of your hand!

SMART HOME READY - Integrate smoothly with Control4 and other automation systems via RS232 for centralized, hands-free control.
LIMITLESS EXPANSION - Scale your audio system up to 18 zones to create a fully immersive, whole-building sound experience.
SEAMLESS APP INTEGRATION - Control volume, sources, and zone grouping effortlessly from your smartphone or tablet anytime, anywhere.
POWERHOUSE MULTI ZONE AUDIO - Deliver crisp, room-filling sound with 80W per channel across 6 independent zones—perfect for home or office.
LOCAL REMOTE CONTROL OPTIONS - Use optional in-wall keypads for tactile control or manage everything remotely through the intuitive OSD Control App.

The OSD Audio Nero Max12 is a robust 6-zone, 12-channel amplifier delivering 80W per channel at 4 ohms, designed for custom multi-room audio setups. It supports independent multi-source playback with multiple input options, app-based control for iOS and Android, and smart home integration via RS232. Expandable up to 18 zones, it offers flexible control through both mobile app and optional in-wall keypads, making it ideal for whole-home or light commercial audio distribution.

Specifications

ASIN	B08V4F9HYF
Best Sellers Rank	#256,074 in Electronics ( See Top 100 in Electronics ) #1,453 in Audio Component Amplifiers
Customer Reviews	3.8 3.8 out of 5 stars (32)
Date First Available	September 25, 2019
Item Weight	31.3 pounds
Item model number	MAX12
Manufacturer	OSD Audio
Package Dimensions	22 x 21.5 x 9 inches

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OSD Audio Nero Max 12 Channel Multi Room Amplifier 6 Source Integrated 80W iOS/Android App Control (Keypad Optional) (MAX12)

Description

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