Can this device simultaneously play audio from two different inputs or does it only switch in between the two audio inputs?

It only switches between the two audio inputs. It cannot mix or play two inputs together. I use it in reverse, with the audio from my computer connected to the OUT jack, with computer speakers connected to A, and headphones connected to B. Works great!

Can I turn off switch and hear or overlap all three input devices (computers) at the same time?

There is no off position on the knob, you can only switch between the 4 inputs, just one at a time, you cannot overlap or channel more than one at a time. This is a very solid high quality audio switch, I use it for my turntables setup.

Does this support 4 pole? Specifically can a headset with a mic be plugged in to an output and transmit to an input computer?

I am fairly but not absolutely certain the answer is no. I don't particularly want to disassemble mine to check for sure but it's open construction gives some visibility into how many solder connections there are to the input and output jacks. Between that and what people say about it comments, and the product description -- pretty sure, no. That could be a nice product, though.

Can this be used for a phono signal (not line)?

If the phono signal is already at line level (amplified though a preamp with the required R.I.A.A. curve, the answer is yes. Otherwise, no.

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3 in 1 Out RCA Stereo Audio Source switcher Switch Signal selector Splitter schalter Connector Distributor Box

Product ID: 217413662

Details

Brand
SOLUPEAK
Cable Type
RCA
Color
3 ports RCA IN
Compatible Devices
DVD Player
Connector Type
RCA

⚡Passive design, no power supply needed

🔄3-in-1 input & 1-out or 1-in & 3-out versatility

🔇Instant mute function for zero output

NZ$69

Duties & taxes included

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Sold byAmazon New ZealandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎧 Switch, mute, and vibe—your audio command center awaits!

MUTE ON DEMAND - Hit the red button to instantly silence your audio—perfect for quick breaks or private moments.
SPACE SMART DESIGN - Miniature footprint (115x65x45mm) fits perfectly on any desk or entertainment center without clutter.
PLUG PLAY SIMPLICITY - No power adapter required—compact and lightweight for hassle-free setup anywhere.
UNIVERSAL COMPATIBILITY - Works flawlessly with CD players, TVs, DACs, amplifiers, and more—streamline your entire audio ecosystem.
SEAMLESS MULTI SOURCE SWITCHING - Effortlessly toggle between 3 audio inputs or distribute 1 input to 3 outputs with a smooth rotary switch.

The SOLUPEAK 3-in-1 RCA Audio Source Switcher is a compact, passive signal selector that allows users to easily switch between three audio inputs or distribute one input to three outputs. Featuring a smooth rotary switch and an instant mute button, it requires no external power and supports a wide range of audio devices including CD players, TVs, and amplifiers. Its lightweight, space-saving design makes it an essential tool for managing multiple audio sources with professional ease.

Specifications

ASIN	B085Y96LHZ
Best Sellers Rank	#210 in Audio & Video Selector Boxes
Brand	SOLUPEAK
Cable Type	RCA
Color	3 ports RCA switch(3 IN 1 OUT)
Compatible Devices	DVD Player, Television
Connector Type Used on Cable	RCA
Customer Reviews	4.1 4.1 out of 5 stars (1,004)
Item Dimensions D x W x H	2.36"D x 4.25"W x 1.77"H
Item Weight	0.1 Kilograms
Manufacturer	Zhuogang
Model Number	AS31
Number of Ports	3
UPC	659438712261

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NZ$69

Duties & taxes included

In stock

Sold byAmazon New ZealandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to New Zealand.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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