Can you plug in a sub-woofer?

Only if your sub feeds your monitors. If you don't know the answer to that question, you should probably start there. This device just provides 2 source inputs, and 2 stereo outputs.

I want to use this to control if sound comes through my headphones or studio monitors. Is the phones out affected by the mute or monitor toggles?

It has 2 headphone outputs, each with their own control, and a knob to choose between cue an input. It is not affected by monitor toggles or mute; those just turn the respective monitor speaker on and off. I run my mains on A and my subs on B for independent control. Each monitor also has its own trim level to manage balance. This thing behaves like any line mixer should.

What cables do i need? i do not know how to set up. i have 2 krk studio monitors and scarlet solo interface. please help

You need 2x RCA to 1/4" cables to connect your Scarlett to the Big Knob, and 2x 1/4" to 1/4" to connect the Big Knob to your monitors. Since the Scarlett is unbalanced out, there's no reason to use TRS (balanced) cables for your monitor run.

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Description

🎛️ Elevate your studio game with pure, effortless control

PURE PASSIVE AUDIO PATH - No active circuitry means zero signal degradation—experience pristine, transparent sound every time.
PLUG AND PLAY SIMPLICITY - No power required—just connect and control your setup with zero fuss or noise.
INTUITIVE BIG KNOB CONTROL - Effortlessly adjust volume with the iconic, tactile Big Knob for precise monitoring.
ESSENTIAL STUDIO CONVENIENCE - Mono, mute, and dim buttons put critical monitoring functions at your fingertips.
SEAMLESS DUAL SOURCE MONITOR SWITCHING - Instantly toggle between two stereo sources and two monitor pairs for ultimate studio flexibility.

The Mackie Big Knob 2x2 Passive is a compact, power-free studio monitor controller designed for professional audio setups. It allows seamless switching between two stereo sources and two pairs of monitors, featuring a classic volume knob and essential monitoring controls like mono, mute, and dim. Its passive design ensures the cleanest audio path with maximum transparency, making it a must-have for studios prioritizing pristine sound quality and straightforward operation.

Specifications

Special feature	Volume Control
Recommended uses for product	For Studio Use
Compatible devices	Desktop, Laptop
Surround-sound channel configuration	2.0
Colour	Black
Included components	Recording Software (Waveform), Stereo Male-to-Male 3.5MM Mini Cable
Product dimensions	19.8D x 21.1W x 12.4H centimetres
Item weight	1 Kilograms
Is waterproof	False
Warranty type	Limited
Number of items	1
Control method	Touch
Speaker size	1 Inches
Power source	Corded Electric
Item model number	Big Knob Passive
Connector	USB
Speaker Amplification Type	Passive
Material Type	Metal
Size	Passive 2x2
Voltage	240 Volts
Item Weight	1 kg

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