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Pro-Ject T1 Phono SB + Sonos Five - Deep Buzz

  • November 6, 2024
  • 5 replies
  • 127 views
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Hi Everyone, 

 

I recently received my Pro-Ject T1 Phono SB and Sonos Five, and I’m super excited about them! I ordered both items separately, as well as an RCA to 3.5mm adapter from Amazon, just in case. Some people say it might be included in the SB, while others say it’s not.

 

It turns out that it wasn’t included.

 

I set everything up and was ready to play my first vinyl, but I’m getting a continuous deep buzz through the speaker. I can hear the music, but the buzz is still there, and it’s at all volumes.

 

I’m using the supplied RCA cables with ground tabs on both ends; however, one of the ground tabs is in free air as I’m using the RCA - 3.5mm adapter. I’ve moved the positions and distances between the T1 and the speaker, as well as moved rooms and turned off other devices. But nothing seems to make a difference.

 

I did notice that when I move the tone arm, the buzz does seem to change slightly. Touching it alone doesn’t make a difference, but when it’s moved, it does seem to change, but it’s intermittent.

 

I’ve tried two different RCA - 3.5mm adapters with no change. I’m starting to think it might be the grounding. If so, where should I attach the currently loose earth tab to?

 

Any advice would be greatly appreciated! 

Best answer by Corry P

Hi @BennyJ 

Welcome to the Sonos Community!

Sorry to hear of this buzzing issue you are having when playing you turntable.

It sounds like you may benefit from fitting a Ground-loop Isolator between your turntable and your Sonos Five - they are pretty cheap.

I hope this helps.

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5 replies

Stanley_4
  • Stanley_4
  • Lead Maestro
  • 11223 replies
  • November 6, 2024

That really sounds like AC hum, open connections or grounding issues.

Check all connections from the cartridge pinsto the plug into the Sonos.

 Verify the pre-amp is set to line in.

Make sure the 3.5 plug is fully seated, flushwith the jack.

If  none of these work try flipping only one power cord.

Airgetlam
1 person likes this
  • Airgetlam
    Airgetlam
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  • BennyJ
  • Author
  • Contributor I
  • 1 reply
  • November 6, 2024

Thank you so much for your reply. 
 

I just checked everything you suggested, but no change unfortunately. 
 

I have just ordered another RCA - 3.5mm cable adapter, I got the cable adapter this time rather than just the little plastic adapter.

 

Once everything’s plugged in, should I leave the ground tab that’s on the Sonos end of the Pro-Ject RCA cables just in fresh air? 

Stanley_4
  • Stanley_4
  • Lead Maestro
  • 11223 replies
  • November 6, 2024

Probably, there is no access to the internal Sonos ground.

Airgetlam
1 person likes this
  • Airgetlam
    Airgetlam
Corry P
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  • Corry P
  • Sonos Staff
  • 8526 replies
  • Answer
  • November 11, 2024

Hi @BennyJ 

Welcome to the Sonos Community!

Sorry to hear of this buzzing issue you are having when playing you turntable.

It sounds like you may benefit from fitting a Ground-loop Isolator between your turntable and your Sonos Five - they are pretty cheap.

I hope this helps.

"Common sense is the collection of prejudices acquired by age eighteen." - Albert Einstein
buzz
  • buzz
  • 23889 replies
  • November 11, 2024
BennyJ wrote:

Hi Everyone, 

I did notice that when I move the tone arm, the buzz does seem to change slightly. Touching it alone doesn’t make a difference, but when it’s moved, it does seem to change, but it’s intermittent.

 

I’ve tried two different RCA - 3.5mm adapters with no change. I’m starting to think it might be the grounding. If so, where should I attach the currently loose earth tab to?

This suggests that at least part of the problem is an external magnetic field from a nearby device. This could be a large appliance (air purifier, fan, computer, external power supply) or a very close small power supply. Moving the turntable arm changes the cartridge position relative to the magnetic field.  You can investigate which devices are causing the issue by systematically changing the orientation of the external devices relative to the turntable. 

An additional but similar issue could be caused by the external magnetic field(s) directly inducing hum in the signal cables. Again, re-orientating relative positions is the way to investigate.

The phono ground should be connected between the turntable and the preamp. If there is no ground lug on the preamp input, try touching the ground wire to the metal outside portion of the RCA plug.

The ground isolator may help, but it is usually not required for turntables.

If you want to explore wild possibilities, temporarily disconnect the cable TV feed from the external cable connection.

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