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!

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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.

G

GuitarSuperstarAnswer

Lead Maestro

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.

"Receive with simplicity everything that happens to you." - Rashi

Klav_001Author

Enthusiast I

Okay for sure - the source level currently set at 1 out of 10. I’d like to play around with it, but unfortunately I’m hearing a lot of clipping on vocals/treble if the Line-In Source Level is higher than 1, which seems bizarre to me. Using an Ortofon 2M Red cartridge.

Comfortable vinyl listening on the volume bar is around 45/100, so I don’t need to turn it up crazy loud with the Line-In level at a measly 1/10. But why does my Line-In volume need to be so incredibly low to avoid clipping?

Klav_001Author

Enthusiast I

Alright - just got off the phone with Sonos support and they told me that if I’m keeping my Line-Out Level at 1, there’s way too much power coming from my turntable + phono preamp setup that’s being funneled into the Amp and I should use a Port instead.

Great…..haha

ratty

Alright - just got off the phone with Sonos support and they told me that if I’m keeping my Line-Out Level at 1, there’s way too much power coming from my turntable + phono preamp setup that’s being funneled into the Amp and I should use a Port instead.

The Line-In sensitivity of the Port is the same as the Amp.

If your Amp is not auto-stopping playback after you lift the needle, suspect a grounding problem. Inaudible ripple could be preventing the Amp from detecting silence.

G

GuitarSuperstar

Lead Maestro

Alright - just got off the phone with Sonos support and they told me that if I’m keeping my Line-Out Level at 1, there’s way too much power coming from my turntable + phono preamp setup that’s being funneled into the Amp and I should use a Port instead.

Great…..haha

Make sure the cartridge mode on the phono amplifier is set to MM rather than MC. If it’s currently set to MC, make sure the unit is disconnected from the power supply and Amp before you change the mode to MM.

"Receive with simplicity everything that happens to you." - Rashi

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. Ground wire from the turntable is grounded to the terminal on the Phono Box.

Any suggestions regarding power supply/surge protectors/etc are welcome. Or is this something in which I need to swap out my vintage turntable for a newer one? I’m out of ideas and worried that I could fry this new Amp.

Klav_001Author

Enthusiast I

Thanks for the tip - it’s set to MM.

Ken_Griffiths

Okay for sure - the source level currently set at 1 out of 10. I’d like to play around with it, but unfortunately I’m hearing a lot of clipping on vocals/treble if the Line-In Source Level is higher than 1, which seems bizarre to me. Using an Ortofon 2M Red cartridge.

Comfortable vinyl listening on the volume bar is around 45/100, so I don’t need to turn it up crazy loud with the Line-In level at a measly 1/10. But why does my Line-In volume need to be so incredibly low to avoid clipping?

Have you perhaps got the Pro-Ject Phono Box DC preamp switch set for MC cartridge by mistake?

edit: I see now that’s just been answered whilst I was typing my post - please ignore.

Ken_Griffiths

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?

Ken_Griffiths

In a online review of the Pro-Ject Phono Box DC prep-amp here I note that it mentions this:

Ultra-low Impedance Output Stage

The Pro-Ject Audio Phono Box DC is an audiophile grade phono preamplifier. It has a low output impedance that makes it incredibly easy to drive even the most delicate of speakers and doesn’t require any power amps or amplifiers at all, making this compact unit very portable. The three digit Ultra-low Impedance Output Stage provides crystal clear sound with no loss in detail whatsoever.

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Ultra-low Impedance Output Stage

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