Can i use both (6.35mm and aux in) at the same time?

Yes, both inputs can be used at the same time.

Are these stereo outputs? Or does it convert the input signal to mono?

All four headphone outputs are stereo. There is a push-button to turn them to mono. There are left and right inputs. When the mono push-button is depressed, the left and right inputs are summed together to make a mono signal in all four of the headphone outputs.

Single 1/4 balanced trs cable to dual rca for tv. will i still get stereo sound or do i need two trs? there are two ports.

never use it as it not worked at all

Can I connect a pair of speakers to the aux out and then four headphones to the 4 headphones out?

I don't see why not. I wouldn't suggest it because of the ceiling of power available. There are better options for whatever your use case, but it will be more expensive. Also, I just saw they are selling this for $80 right now. I bought it for $45 a few years ago, and that's the most I'd pay for it today. Definitely not worth $80 unless they've upgrade the internals.

Samson Qh4 4 Channel Headphone Amplifier

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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C$12620

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Sold byAmazon NicaraguaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎧 Amplify your studio’s vibe—hear every detail, share every moment.

MASTER YOUR MIX - Independent volume knobs let each user dial in their perfect sound level—no compromises.
PRO GRADE CLARITY - Wide 17Hz–47kHz frequency range ensures every detail in your mix is crystal clear.
VERSATILE CONNECTIVITY - Dual balanced 1/4" inputs plus stereo 1/8" Aux in/out for seamless integration with any setup.
COMPACT DURABLE DESIGN - Sturdy stainless steel chassis fits perfectly on your desktop or studio rack, built to last.
PERSONALIZED LISTENING FOR FOUR - Distribute pristine audio to up to 4 headphones simultaneously with zero signal loss.

The Samson QH4 is a professional 4-channel headphone amplifier designed for music production, podcasting, and shared listening. It features four independent stereo headphone outputs with individual volume controls, dual balanced 1/4" inputs, and stereo 1/8" Aux input/output. Its compact, durable stainless steel design delivers high-fidelity sound across a wide frequency range (17Hz–47kHz) without signal degradation, making it an essential tool for collaborative audio environments.

Specifications

ASIN	B01N5K2QKQ
Additional Features	Lightweight
Age Range Description	Adult
Antenna Location	Recording, Studio Monitoring
Audio Driver Type	Dynamic Driver
Best Sellers Rank	#29,032 in Musical Instruments ( See Top 100 in Musical Instruments ) #112 in Power Amplifiers #155 in Headphone Amps
Brand Name	SAMSON
Built-In Media	Amp
Cable Features	Retractable
Carrying Case Color	Black/Silver
Color	Black/Silver
Compatible Devices	Music Production Equipment, Laptops, Desktops, Smartphones
Connectivity Technology	Wired
Control Method	Remote
Control Type	Volume Control
Controller Type	Volume Control
Customer Reviews	4.5 4.5 out of 5 stars (209)
Earpiece Shape	Over-ear
Enclosure Material	Stainless Steel
External Testing Certification	Não aplicável
Frequency Range	17Hz–47kHz
Global Trade Identification Number	00809164019879
Headphone Folding Features	Headphone Amp
Headphone Jack	3.5 mm Jack
Headphones Ear Placement	Over Ear
Impedance	600 ohm
Item Type Name	Samson QH4 4-Channel Headphone Amplifier
Item Weight	1.5 pounds
Manufacturer	Samson
Model Name	QH4
Model Number	SAQH4
Noise Control	None
Number of Items	1
Specific Uses For Product	Music production, Podcasting, Shared entertainment, Personal entertainment, Study
Style Name	Boom microphone stand with a telescoping boom arm
Theme	Professional Recording and Monitoring
UPC	809164019886 809164019879
Unit Count	1 Count
Warranty Description	2-year limited warranty.
Water Resistance Level	Not Water Resistant

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