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 Post subject: noise/hum question about the sp-404sx
PostPosted: Mon Nov 06, 2017 2:38 pm 
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hi all,

I've a question - I was trying to sell my sp-404sx (keeping my beloved 303), and a guy I sold it to me returned it because he noticed a hum/background noise in it, and decided he couldn't use it for that reason. I replied to him that some hum is common in any device which outputs audio, you can't expect it to be fully silent, and that also he might check if it was affected by the power grid, or by other devices on the same power outlet. But in the end it didn't help, so I got the machine back.

I tried it myself, to see if I noticed any difference from when I used the machine myself (which was a while ago)... I don't think there's a difference, but it's true there is a noticeable hum, but it doesn't get recorded when you sample and resample. So I figure it only occurs in the output, and not in the data that the machine works with. (Which makes sense I guess.)

The funny thing is that the hum only occurs when the volume is somewhere in the middle - it's inaudible when volume is all the way down, and it also disappears when you turn the volume all the way up (when not playing samples, of course).

I was wondering, can other SX users confirm this same behaviour or is it different? I think I will put the machine back up for sale without mentioning this, if it's not specific to this machine.

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 Post subject: Re: noise/hum question about the sp-404sx
PostPosted: Mon Nov 06, 2017 6:10 pm 
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Joined: Wed Sep 27, 2017 11:45 pm
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Location: Washington
I hate to say it, but I've never heard a hum or any noise with my 404sx, it's really clear (I got it about 2 years ago & use it DAILY). When adjusting the volume it crackles a little, but as long as I don't touch the volume knob it's fine. Crystal clear.


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 Post subject: Re: noise/hum question about the sp-404sx
PostPosted: Mon Nov 06, 2017 11:33 pm 
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might be a grounding issue . I'm no electrician, but its the only conclusion I can come up with. might need to take a look at the unit (if you know circuitry . or someone who does) could just need to remove the cover and clean the ports .

is there an input source connected that's turned off?

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 Post subject: Re: noise/hum question about the sp-404sx
PostPosted: Tue Nov 07, 2017 12:30 pm 
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This only happens on my 404sx also, The hum appears only if the ext source button is turned off...
And it also sounds strangely weird..


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 Post subject: Re: noise/hum question about the sp-404sx
PostPosted: Sat Nov 11, 2017 2:55 pm 
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Joined: Sat May 29, 2010 4:41 pm
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Thanks for your replies, all. I guess it could use being looked at, in a repair shop which does audio gear in general. But I don't want to spend a lot for a machine which I intend to sell. I'll probably try and sell it and be upfront about it, have people come by and try it out.

I know for a fact that this machine hasn't ever been 'crystal clear' so perhaps I should have used the warranty when I still had it. I actually never thought much of it, but I do think that my 303 is more silent than the 404sx. Might be another reason why I like the 303 better.

thanks again for the feedback.

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 Post subject: Re: noise/hum question about the sp-404sx
PostPosted: Sat Nov 11, 2017 3:03 pm 
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THEGREAT wrote:
might be a grounding issue . I'm no electrician, but its the only conclusion I can come up with. might need to take a look at the unit (if you know circuitry . or someone who does) could just need to remove the cover and clean the ports .

is there an input source connected that's turned off?


Thanks, I will try out if this makes a noticeable difference, but I've never noticed that before.

Last time I tested, I had it connected to the headphone out of the living room amplifier, which is connected to other devices which are plugged into the wall socket and turned off. Only the record player is grounded to the amp, and the amp itself I think isn't grounded. Previously I've tested the SP connected to my laptop running on batteries, and by itself, sampling the audio out from my telephone.

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 Post subject: Re: noise/hum question about the sp-404sx
PostPosted: Mon Nov 13, 2017 1:32 am 
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Location: Denmark
Just got a used sx and i got this problem too. The buzz goes away when i press ext source(sometimes other buttons) and comes back when i press a pad or turn a knob. It wouldn't be a big deal cause it's super low, but i really wan't to run 404 stuff through the 303 vinyl comp and when i do that the buzzing is annoing af :cry: i tried it on batteries away from my computer and stuff, but it's still there. If anyone have been able to fix this or got some workaround i would be so gratefull


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