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I use this VU meter to compare Amplifiers and Speakers , it does a great job in helping me switch between Amplifier A to B and Speakers 1 to Speakers 2. It work much better then my A-B switcher
Douk Audio VU3 Dual Analog VU Meter, 2-Way Amplifier/Speaker Switch, Audio Switcher Box with DB Panel Display
A knob to control the pointer swing range
Amplifier type supported: all kinds of type (BTL /Class A /Class AB /Class B / Class D digital amp / tube amp etc.)
Working mode: 2-IN-1-OUT / 1-IN-2-OUT
1*VU3 VU Meter & Audio Switcher
1*Remote Control 1*USB Cable 1*User Manual