DSjr noise without attenuation


#1

Hi,

I’ve just received my DSjr and am really loving it smile

I am running Roon via Bridge (on a wireless extender) directly into a pair of Atsah 500s which are driving Spatial Hologram M4s.

If I turn the attenuation off I get moderately loud white noise from the speakers (with nothing playing). I can clearly hear it from across the room 4-5 metres away. When I engage attenuation the noise almost completely disappears even when I’m right next to the speakers.

Is this static the noise floor of the system being exposed and that’s exactly why the attenuation feature is there? Or is it showing up because there’s something amiss in the system, maybe dirty power or something?

Cheers,

James


#2

Yes, the attenuator is there for systems which are sensitive enough that the noise is bothersome when it’s not used. It attenuates both the signal and the noise 20dB. DSD inherently has a higher noise floor than PCM and tho this noise can be filtered out, such filtering also tends to take away from the music.


#3

Hi Ted, I’m also getting “white noise” from my speakers between tracks but don’t like to use the built in attenuator as it means I have to wind the volume up to around 90 to get a decent level - and I’m then terrified of accidentally hitting the filter button on my remote and frying my speakers.

I see that Rothwell sell a high quality XLR -10db attenuator which I think would get over this problem - I’d be able to leave the DS attenuator off and reduce the white noise. It would also mean I could wind the volume up a bit (I’m currently playing at around 50) without risking the speakers.

Is there any downside to this - could the XLR attenuators have a detrimental effect on the sound quality?

Many thanks,

Mike.


#4

The downside of an inline attenuator is often more the extra connections: if the sound is worse just unplug and replug to see if you can get a firmer connection.

But you might consider that if you ever do accidentally hit the “filter” button you’ll hit it again quickly :slight_smile: Even if you were really rocking out, I doubt that you’d hurt the speakers with a short burst of loudness. I’ve never hit the filter button by accident, but YMMV.


#5

I have occasionally pondered the value that a physical switch for locking the output into low mode might provide. It just has to pull the relay closed. Maybe for a future product revision.


#6

I think the same could be accomplished with software – a ‘disable attenuator remote’ option in the menus somewhere?


#7
dvorak said I have occasionally pondered the value that a physical switch for locking the output into low mode might provide. It just has to pull the relay closed. Maybe for a future product revision.
Being pedantic: we use latching relays (they remember their current states with no power.) To keep the contacts in good order we toggle them twice at each startup which couldn't be done if there was a physical override. I'll think about some way to do something equivalent.
jimmy.kl said I think the same could be accomplished with software – a 'disable attenuator remote' option in the menus somewhere?
It all depends on whether you trust a software solution - there's always a higher chance that something goes wrong in the software than in hardware. On the other hand it's a little late for a hardware solution in the already built devices :)

#8

I was more thinking of your 6 year old son picking up the Remote and accidently pressed the Filter button…

(This sounds better than one coming home drunk and then decide to listen to some music beer_gif20_gif)


#9
jimmy.kl said I think the same could be accomplished with software – a 'disable attenuator remote' option in the menus somewhere?
Hi jimmy, welcome to the forum, this JT from MD

#10
Ted Smith said
dvorak said I have occasionally pondered the value that a physical switch for locking the output into low mode might provide. It just has to pull the relay closed. Maybe for a future product revision.

Being pedantic: we use latching relays (they remember their current states with no power.) To keep the contacts in good order we toggle them twice at each startup which couldn’t be done if there was a physical override. I’ll think about some way to do something equivalent.

jimmy.kl said I think the same could be accomplished with software – a 'disable attenuator remote' option in the menus somewhere?

It all depends on whether you trust a software solution - there’s always a higher chance that something goes wrong in the software than in hardware. On the other hand it’s a little late for a hardware solution in the already built devices :slight_smile:

I too have the same white noise experience. To remove the noise from my speakers even after switching ‘off’ the DSjr via remote I have to hit the Attenuator switch to Low and then power off. It’s an extra step on shutdown and on, but it is the only way to quiet the system. So if there is something that could be done programmatically in a future version that would be great.


#11
raymond said

I too have the same white noise experience. To remove the noise from my speakers even after switching ‘off’ the DSjr via remote I have to hit the Attenuator switch to Low and then power off. It’s an extra step on shutdown and on, but it is the only way to quiet the system. So if there is something that could be done programmatically in a future version that would be great.

Hmm, the power off should mute the DAC (which uses a relay to short the output.) But as I test it here the relays don't even click when I press mute - I don't know when that bug crept in... We'll fix it.

#12

Hi, just to say, I have Directstream, not Junior, but I’m assuming this thread applies equally to both? Regards, Mike.


#13

Except for the mute bug :slight_smile: