In xlr input - rca output setup, does it invert and sum up negative with positive signal(removing noise), and then only pass to rca?

Using XLR at both ends gives a better sound, if using XLR at one end and the other end is RCA, the sound output will slightly lower down and need to increase the volume and there will be no sound distortion.

When output "A" is selected, are outputs "B" and "C" left floating or are they grounded, etc?

Well this is a 3 IN 1 OUT switch. So only one out. As for the other inputs being grounded when not selected, I can’t answer that, but there is no noise from other inputs.

Balanced inputs without balanced internals? one customer review claims as much, which defeats the purpose of using xlr cables. is this true?

Hello. It is balanced in and out. This device won't change any characteristics. It is only a passive converter.

Nobsound 3 In 1 Out Xlr Audio Switch Balanced Passive

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Description

MC103-Pro is a 3-way passive stereo audio splitter. It supports 3 stereo XLR inputs and 1 output. You can choose freely according to your audio device.
MC103 is designed for customers have several music equipment with XLR balanced output. You can conveniently switch among different sound sources and compare their sound performance.
All aluminum shell to effectively avoid external noise and guarantee high-quality signal transmission; Gold-plated XLR ports to ensure high reliability electric connection and minimize signal attenuation during its transmission.
Each channel has been connected with shielding wire to avoid interference from outside and make sure lossless signal transmission. Exquisite appearance with mini size; can be easily placed and carried to enjoy the charming of music everywhere.
Passive audio switcher, no impact on the sound quality; Silver-plated contacts make the knob very smooth

Features: MC103-Pro is a 3-way passive stereo audio splitter. It supports 3 stereo XLR inputs and 1 output. You can choose freely according to your audio device. MC103 is designed for customers have several music equipment with XLR balanced output. You can conveniently switch among different sound sources and compare their sound performance. All aluminum shell to effectively avoid external noise and guarantee high-quality signal transmission; Gold-plated XLR ports to ensure high reliability electric connection and minimize signal attenuation during its transmission. Each channel has been connected with shielding wire to avoid interference from outside and make sure lossless signal transmission. Exquisite appearance with mini size; can be easily placed and carried to enjoy the charming of music everywhere. Passive audio switcher, no impact on the sound quality; Silver-plated contacts make the knob very smooth. Parameters: Material: aluminum Dimensions: (L)148mm*(W)105mm*(H)69mm Net Weight: 470g Packing List: 1 * XLR Audio Selector (Notice: any audio cable is not included.)

Specifications

ASIN	B07QVKPR2V
Audio Output Mode	Stereo
Best Sellers Rank	#639,442 in Electronics ( See Top 100 in Electronics ) #457 in Selector Boxes
Brand Name	Douk Audio
Cable Type	XLR
Color	Black
Compatible Devices	Amplifier, Mixer, Player
Connector Type Used on Cable	XLR
Customer Reviews	4.7 4.7 out of 5 stars (298)
Importer Contact Information	E-SHARKIRAI ENTERPRISESS TRADING PRIVATE LIMITED, Near Holi Chowk, KHASRA NO. 50/6/1,2-3,6/21-16, BIJWASAN, South West Delhi, Delhi 110061
Item Dimensions D x W x H	10.5D x 14.8W x 6.9H Centimeters
Item Type Name	XLR Audio Switch
Item Weight Unit of Measure	472 g
Manufacturer	Nobsound
Manufacturer Part Number	GFJ721
Model Number	GFJ721
Number of Items	1
Number of Packs	1
Number of Ports	4
Packer Contact Information	Building 6, Tian An Yun Gu Industrial Park Phase 2, Gangtou Community, Bantian Street, Longgang District, Shenzhen City, Guangdong
Power Source	Passive
Warranty Description	18 months

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Nobsound 3-IN-1-OUT XLR Audio Switch: Balanced Passive Selector Stereo Converter for Multi Source Comparison Gold Plated Shielded Aluminum Studio HiFi Audiophile (MC103 Pro 3-in)

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