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Answered

Headphone adaptor

  • December 2, 2025
  • 2 replies
  • 55 views

I have the following

Pro-Ject Phono Box S3 B (Black) 

Pro-Ject Maia S3 (Black)

I would like to link up with my Sonos Ace headphones.

however when I tried using the 6.5 to 3.5 adapter they did not work

please advice on a compatible adapter or a 6.5 to usb-c cable

 

Best answer by Stanley_4

Edit:

Went back and read more and it has a headphone output on the front panel I didn’t recognize at first. It looks to be a standard 1/4” jack so instead of the RCA to 3.5mm you’d just use a 1/4” to 3.5 mm converter cable to connect the Ace 3.5 mm cable to.

 

No clue about the connections you mention.

Edit: Ah! 6.3 not 6.5 got me confused. (Headphone output: 6.3mm (1/4″) jack)

Original post:

Looking at the unit it looks like you would simply connect the Ace 3.5 mm cable to the Analog Output using a stereo RCA to 3.5mm converter cable.

https://pro-jectusa.com/product/maia-s3-integrated-amp/

https://www.amazon.com/CableCreation-Smartphones-Tablets-Speakers-Theater/dp/B075S1W5SY?th=1

 

2 replies

AjTrek1
  • December 2, 2025

Stanley_4
  • Lead Maestro
  • Answer
  • December 2, 2025

Edit:

Went back and read more and it has a headphone output on the front panel I didn’t recognize at first. It looks to be a standard 1/4” jack so instead of the RCA to 3.5mm you’d just use a 1/4” to 3.5 mm converter cable to connect the Ace 3.5 mm cable to.

 

No clue about the connections you mention.

Edit: Ah! 6.3 not 6.5 got me confused. (Headphone output: 6.3mm (1/4″) jack)

Original post:

Looking at the unit it looks like you would simply connect the Ace 3.5 mm cable to the Analog Output using a stereo RCA to 3.5mm converter cable.

https://pro-jectusa.com/product/maia-s3-integrated-amp/

https://www.amazon.com/CableCreation-Smartphones-Tablets-Speakers-Theater/dp/B075S1W5SY?th=1