Question

Headphone adaptor

Forum|Forum|3 days ago
December 2, 2025
2 replies
49 views

S

Stuartdm65
Contributor I

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

AjTrek1
Forum|Forum|3 days ago
December 2, 2025

You need a RCA to USB-C cable like the one in the link.

Connection is Pro-Ject to MAiA phono RCA input > Pro-Ject MAiA RCA out > USB-C input of Ace.

https://www.amazon.com/CableCreation-Splitter-Adapter-Theater-Amplifier/dp/B0C5WGTM9H/ref=mp_s_a_1_1_sspa?crid=3M4H6XURC38DP&dib=eyJ2IjoiMSJ9.qucr-qOUWKiChVkbhms3vXzeDeX7nWnCHVFc90ZKO0eguVW7i96KtBpIcPn9dM7DB6Uum3p3nnuKqB1Wct7RjHdEbhAyVLzm36dzBk7fh2KuZAhRfC_33Uc6i0fij0vbwD7cg2hx8xWR83qmMnTijXfxy721mevAwHRJwClHE7WvO_HdVMQ_HqotLb_SaRqJ9S2Mnvjr0XXx89tQ1Q1-7Q.NewaNUa5UHFsZMGfRvtQ2hPHZARsTXz3RGBhGaPzUNA&dib_tag=se&keywords=rca+to+usb+c&qid=1764710038&sprefix=rca+to+usd%2Caps%2C231&sr=8-1-spons&sp_csd=d2lkZ2V0TmFtZT1zcF9waG9uZV9zZWFyY2hfYXRm&psc=1

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Stanley_4
Lead Maestro
Forum|Forum|3 days ago
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/