Enthusiast I

Answered

Sonos Amp: Line-In Autoplay Won't Turn Off with Vinyl Setup

Forum|Forum|4 years ago
March 31, 2022
17 replies
804 views

I just got a Pro-Ject Phono Box DC preamp to go with my Amp + Pioneer PL-50 setup. Plugged in the Phono Box, dropped the needle, Autoplay worked, and it sounded great. No issues there.

Annoyingly, after I stopped the the record, Autoplay didn’t turn off. It’s been 40min and the Amp still hasn’t automatically turned it off. I believe I understand that Autoplay is based on a voltage from the record player/preamp which sends a signal to the Amp, so I guess that signal hasn’t stopped, probably because the Phono Box doesn’t have an on/off switch.

Is this just the way it is with a phono preamp that stays ‘on’ all the time?

Will I have to get a phono preamp with an on/off switch if I want Autoplay to turn off?

TV Autoplay isn’t turned on, by the way. Thanks!

This topic has been closed for further comments. You can use the search bar to find a similar topic, or create a new one by clicking Create Topic at the top of the page.

Best answer by GuitarSuperstar

The Amp doesn’t completely turn off unless you unplug it from the wall. If the Amp doesn’t detect an audio signal, it will go into an idle/low power mode after three minutes. If the Amp won’t go into idle mode, try adjusting the Source Level setting lower under the Amp’s Line-In settings in the Sonos app.

Show previous replies

Klav_001Author

Enthusiast I

Thanks ratty. That’s very strange then, I have no clue as to why I could go from using 10/10 on my Port to 1/10 with the Amp and the preamp.

This seems a little odd to me - Have you considered swapping the setup back to the ‘Port’ to see if everything is then okay again?

Yep, I just switched back to the setup with the Port to see if anything would change. I added the Phono Box this time, plugged into my Onkyo receiver into the CD inputs. So it’s turntable + phono preamp + receiver + Port.

Put a record on, turned up the Line-Out Level to 10/10, and no clipping whatsoever with this setup. I continue to be stumped!

I got the Amp in the first place to simplify my setup and to rid myself of my heavy Onkyo receiver, but this Receiver + Port setup seems more reliable right now :(

Ken_Griffiths

Yep, I just switched back to the setup with the Port to see if anything would change. I added the Phono Box this time, plugged into my Onkyo receiver into the CD inputs. So it’s turntable + phono preamp + receiver + Port.

Put a record on, turned up the Line-Out Level to 10/10, and no clipping whatsoever with this setup. I continue to be stumped!

I got the Amp in the first place to simplify my setup and to rid myself of my heavy Onkyo receiver, but this Receiver + Port setup seems more reliable right now :(

Okay, but what happens if you omit the Onkyo Receiver and just setup turntable —> preamp —> port?

Ken_Griffiths

What speakers were the Sonos Amp connected to by the way?.. I’m just trying to ascertain what you are using for your new simplified setup, or were you outputting the line-in TT audio to any other Sonos devices?

Klav_001Author

Enthusiast I

Yep, I just switched back to the setup with the Port to see if anything would change. I added the Phono Box this time, plugged into my Onkyo receiver into the CD inputs. So it’s turntable + phono preamp + receiver + Port.

Put a record on, turned up the Line-Out Level to 10/10, and no clipping whatsoever with this setup. I continue to be stumped!

I got the Amp in the first place to simplify my setup and to rid myself of my heavy Onkyo receiver, but this Receiver + Port setup seems more reliable right now :(

Okay, but what happens if you omit the Onkyo Receiver and just setup turntable —> preamp —> port?

I just hooked this configuration up and sent it to a pair of One speakers, lots of clipping. Line Out was set to 10. Does not sound good.

Klav_001Author

Enthusiast I

What speakers were the Sonos Amp connected to by the way?.. I’m just trying to ascertain what you are using for your new simplified setup, or were you outputting the line-in TT audio to any other Sonos devices?

It’s a set of Monitor Audio Silver 5i speakers. 8ohm, I believe. So should be fine?

The setup I’m looking to switch to is 1970s Turntable + Phono preamp + Amp (connected to Monitor Audio Silver 5i speakers) along with some One speakers.

Klav_001Author

Enthusiast I

In this article Sonos states it so simply:

If your turntable does not have a built-in phono preamp, you’ll need to place one between the turntable and Sonos player.

Okay, I got a preamp because my TT didn’t have one. So why does it sound horrible now? 😂

buzz

Go to Settings → System → PORT/AMP → Source Level and check the settings. They are probably different on PORT and AMP. Incorrect settings here can cause input overload. In my opinion the setting descriptions poorly worded. “Low” means “Low level” for the source. If you are having input overload, you need a higher setting.

Low impedance is a good characteristic for a line level output because it will be able to drive longer cables without issues. This does not imply that one could connect a pair of speakers to a line level output. A low impedance output for a line level might be 50 Ohms. In the overall line out universe this is very low and a great SONOS feature, but this does not imply that you can connect speakers. I have connected headphones to SONOS Line-Out. Amplifier outputs, on the other hand, can have an output impedance of 0.0x Ohms. In this respect AMP is also very low and this is good. There are other characteristics of AMP that make it appropriate to use with very difficult to drive speakers that will fluster lower quality amplifiers.

Sign up

Login to the community