Can I run a subwoofer with this volume control

Depends.. actual studio monitor subs you run the speakers on the output of the sub.. so yes

Are the stereo input/output 3.5mm? If so, can you input 3.5mm and output on trs?

the stereo input and output are a standard 1/8 inch miniplug. I would stick with that. If you have to go to a device with a 3.5mm in/out, you might investigate adapter cables. The internet seems to think these two plugs are not the same thing, and I'm not really familiar with 3.5mm, since in the US we use standard 1/8 inch cables.

can you put headphones?

Yes. You can also plug it into a headphone distribution system.

Can this control a mono signal (single in and out cable) between an instrument pre-amp and power amp, or does it have to have a stereo signal)

Yes, there are separate left and right channels. The input side is XLR/TRS and the output is TRS.

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🎛️ Elevate your audio control game—compact, powerful, and always on point!

BUILT TO LAST - Durable metal enclosure crafted for professional environments
SILENCE ON DEMAND - Quick-access mute button to manage your soundscape effortlessly
POWER FREE PERFORMANCE - 100% passive design means zero power consumption—always ready
PLUG PLAY VERSATILITY - Supports balanced/unbalanced TRS/XLR inputs and outputs plus mini jack I/O
PRECISION AT YOUR FINGERTIPS - Rotary volume attenuation for smooth, exact control

The JBL Professional Nano Patch is a compact, 2-channel analog passive volume controller featuring rotary volume attenuation and a mute button. It supports balanced and unbalanced TRS/XLR inputs and outputs, plus a mini jack I/O, all housed in a durable metal enclosure. Designed for professionals seeking precise, power-free audio control across desktop, laptop, and mobile devices.

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Compatible devices	Desktop, Laptop, MP3 Player, Smartphone, Tablet
Unit count	1.0 count
Surround-sound channel configuration	2.0
Colour	black, silver
Included components	cables
Item weight	340 Grams
Is waterproof	False
Warranty type	Limited
Number of items	1
Control method	Touch
Speaker size	15 Inches
Product Dimensions	13.34 x 9.91 x 6.99 cm; 340 g
Item model number	NPATCH BLK
Material Type	Metal
Wattage	800 watts
Item Weight	340 g

JBL Professional Nano Patch + Compact 2-Channel Passive Volume Controller (NPATCH BLK)

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