Does it work in passive mode? w/o usb power just passtrhu 1 amp to 1 set of speakers?

The instructions are to use the meter in passive mode by using the amp-B and speaker-2 selections. This is what I use and it works perfectly. BTW, turning the meter on while listening does not introduce any “pop” or other noise.

What other model from douk provides switching 2 in and 2 out using rca plugs in lieu of banana plugs?

This is speaker selection device so it uses speaker inputs and outputs. Douk does make component switching devices that will have RCA inputs and outputs for audio components (not speakers). Not sure if they have 2 in, 2 out but there are many others that do. Search RCA audio switcher

does it have an internal mic and not used as a switch?

Hello. If you want internal mic, please choose this one https://www.amazon.com/gp/product/B08N12PSC8/ref=ask_ql_qh_dp_hza

Since it doesn't include the wall wart for the usb power cable, what amperage is necessary? 0.5 amps, 1 amp, 2 amps?

It is 1 Amp, it says it right under the USB jack. You can see it in the Amazon pictures.

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🎛️ Elevate your soundscape with vintage vibes and modern control!

SEAMLESS SWITCHING - Effortlessly toggle between two amplifiers and two speaker pairs without cable wear or signal interference.
VISUAL AUDIO MASTERY - Dual oversized analog VU meters deliver dynamic, vintage-style visual feedback that elevates your listening space.
UNIVERSAL COMPATIBILITY - Supports all amplifier types—BTL, Class A/B/D, tube amps—thanks to fully isolated channels and independent grounds.
SLEEK FUNCTIONAL DESIGN - Compact black chassis with warm VU glow blends vintage aesthetics with modern audio setups for the discerning audiophile.
REMOTE CONTROLLED CONVENIENCE - Adjust settings from across the room with included remote; all preferences auto-save for instant recall.

The Douk Audio VU3 is a premium dual analog VU meter and 2-way amplifier/speaker switcher delivering up to 300W output. Featuring large, dynamic meters and fully isolated channels, it supports all amplifier types while preventing signal interference. Powered via micro-USB and equipped with remote control, it offers seamless switching and user-friendly operation in a sleek, vintage-inspired design.

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Mounting Type	Panel Mount
Number of Channels	2
Maximum Supply Voltage	5 Volts (DC)
Package Type	box
Output Power	300 Watts
Minimum Supply Voltage	5 Volts (DC)
Voltage	5 Volts, 3 Volts

Douk Audio VU3 Dual Analog VU Meter, 2-Way Amplifier/Speaker Switch, Audio Switcher Box with DB Panel Display

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