I normally use 3.5mm - rca connect to my nw-zx300 so will it make differences if i move to the balanced output using the adaptor?

I gather that the NW-ZX300 also has a 4,4mm balanced output. This Gerika adapter however has a serious fault: three poles are electrically shorted so it can only function as an unbalanced adapter (unless Gerika have fixed the problem). This can easily be verified with any multimeter. Obviously the balanced output requires four separate electrical connections to your headphone: two cables to each "ear". To enjoy the balanced output you obviously need headphones with a balanced cable (4 poles/wires). Do not connect unbalanced headphones to a balanced output. If you fulfil those requirements, you also need a true balanced 4.4mm to 3.5mm adapter such as the "Meijunter 4.4mm (Male) to 3.5mm (Female) Balanced Cable Plug Adapter for Sony PHA-2A/iBasso/Fiio/HiFiman Headphones, Replacement Metal Cord Plug Line Jack Connector" in amazon.com. This correctly passes 4 poles from the male plug to the female socket.

Would this work to get 2.5mm balanced output from my es100 dac, for HiFiman Sundara w/ 3.5mm jack?

I believe the balanced outputs (on the DAC) are either 2.5mm or 4.4mm. Most ALSO have a 3.5mm jack. This adapter allows for use of standard 3.5mm headphones/ earbuds on 2.5mm outputs Adapters are available in most configurations. I would get an adapter for 4.4mm or 2.5mm ONLY. This particular adapter fits a 2.5mm output for 3.5mm audio connections. They won't make your 3.5mm output balanced.

Is the cable 2.5 balanced male to 3.5 balanced female or 3.5 unbalanced female?

This Geekria adapter is 2.5mm balanced male to 3.5mm balanced female.

Does this convert the output to balanced audio? Or just allow one to use balanced cables in a 3.5mm port? Is there a balanced audio benefit?

It only adapts. There is no balanced 3.5mm advantage.

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Geekria 4.4mm to 3.5mm Balanced Headphones Adapter Converter for 3.5mm 4-Pole Cable to 4.4mm Player Device, Durable Aluminum Alloy Conversion Audio Plug, Gold Plated

Geekria 4.4mm to 3.5mm Balanced Headphones Adapter Converter for 3.5mm 4-Pole Cable to 4.4mm Player Device, Durable Aluminum Alloy Conversion Audio Plug, Gold Plated

Product ID: 276541305

Details

Colour
Silver
Connector type
3.5mm audio
Item dimensions L x W x H
50 x 8 x 8
Specific uses for product
Personal Audio

✨Gold-plated connectors for pristine audio

🔗4.4mm to 3.5mm balanced conversion

🛡️Durable aluminum alloy shell

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Sold byAmazon GeorgiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎧 Elevate your sound game—connect like a pro, anywhere, anytime.

COMPACT TRAVEL READY - At just 5cm and 5g, this adapter fits perfectly in your pocket or the included PU leather pouch—ready for on-the-go listening.
WIDE DEVICE COMPATIBILITY - Works flawlessly with top-tier players like Sony NW-ZX507, FiiO M11, HIFIMAN R2R2000, and more—join the elite audio club.
PREMIUM BUILD FOR LONGEVITY - Crafted with a robust aluminum alloy shell that resists wear and tear, ensuring your adapter lasts through every commute and session.
AUDIOPHILE GRADE GOLD PLATING - Gold-plated plugs deliver superior conductivity and corrosion resistance for crystal-clear sound clarity.
SEAMLESS BALANCED AUDIO BRIDGE - Effortlessly connect your 4.4mm balanced player to 3.5mm balanced headphones without signal loss.

The Geekria 4.4mm to 3.5mm Balanced Headphones Adapter is a compact, durable audio converter featuring gold-plated connectors and an aluminum alloy shell. Designed for audiophiles, it enables seamless connection between 4.4mm balanced output devices and 3.5mm balanced headphones, supporting a wide range of premium audio players. Its portable size and included PU leather pouch make it an essential accessory for professional-grade sound on the move.

Specifications

ASIN	B075165H2M
Best Sellers Rank	#9,144 in Electronics ( See Top 100 in Electronics ) #108 in Headphone Adapters
Brand	GEEKRIA
Color	Silver
Compatible Devices	Sony NW-ZX507, DMP-Z1, NW-ZX300A, NW-WM1Z, TA-ZH1ES, NW-WM1A, PHA-2A, Lotoo PAW6000, HIFIMAN R2R2000, FIO-M11, Cayin N6ii DAP, iBasso Audio DX160 Player
Connector Type	3.5mm audio jack (Female), 4.4mm (Male)
Current Rating	1 Amps
Customer Reviews	4.3 4.3 out of 5 stars (2,846)
Finish	Matte
Item Dimensions	50 x 8 x 8 millimeters
Item Weight	5 Grams
Manufacturer	GEEKRIA
Mfr Part Number	PJZ44-05
Model Number	PJZ44-05
Number of Items	1
Number of Ports	2
Package Quantity	1
Power Plug Type	No Plug
Smart Home Compatibility	Not Smart Home Compatible
Specific Uses For Product	Personal Audio Equipment
UPC	638170765780
Unit Count	1.0 Count
Warranty Description	1 year manufacturer
Warranty Type	Limited

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