Hiss Questions

Discussion in 'Hardware, Setup & Repair [BG]' started by Matthew_84, Jun 8, 2020.

  1. In my current house, if I play bass facing my laptop and don’t have the treble cut, there’s a substantial hiss coming out of my basses. It completely goes away if I turn 180 degrees.

    it doesn’t seem to be an issue with the shielding as the hiss doesn’t change if I touch the strings or bridge, etc (though, I suppose the bridges may not be grounded itself, I’m not sure).

    Is there anyway to fix this? Spinning around isn’t the biggest problem, but I’d prefer to not have to do it.

    Current basses:
    - Warwick Rockbass Streamer LX (turned passive)
    - Ibanez Portamento Fretless

    Bass, to SA Aftershock (adapter plugged in), to Tascam USB interface, to laptop (laptop plugged in).

    The receptacle is grounded.

    Thanks in advance.
    Last edited: Jun 8, 2020
  2. Stumbo

    Stumbo Guest

    Feb 11, 2008
    What happens when you plug the bass in direct to lap top? I use mic in for my active bass and adjust from there.

    Be sure to start with volume/tone at zero.
    Matthew_84 likes this.
  3. If I plug directly into the USB interface, the hiss is about he same.

    I realized the hiss is coming from the laptop itself, because if I put it to sleep, the hum will pretty much completely go away.

    I don't have an amp and do all of my playing through this USB interface and laptop, lol, so now I'm not sure I'll be able to fix this - unless I figure out why the laptop is creating hum, and can correct that.
  4. Turnaround

    Turnaround Commercial User

    May 6, 2004
    Toronto Canada
    Independent Instrument Technician - Retired
    The fact that the hiss reduces when you rotate 180 degrees says that the problem is shielding.
  5. Thanks Richard! The inside of this Ibanez Portamento is packed to the brim, haha, but I'll give it a go. I shielded a Jazz before and was successful (except for single coil hum of course). Thanks again!
  6. Turnaround

    Turnaround Commercial User

    May 6, 2004
    Toronto Canada
    Independent Instrument Technician - Retired
    I think these basses are already shielded. You should check it out thoroughly before doing anything.
    Matthew_84 likes this.
  7. Thanks Richard. It's been a while since I opened it. I'll poke around with my multimeter. Maybe there's a weak contact somewhere.
  8. Ha, found an old post of mine... I thought I looked at this before:

    Ibanez Portamento Club

    Seems like it needs better shielding. I don't think 1.1k ohms on the same wall 1" apart is that great.

    Edit: Lol, found a whole other thread I made on this too (Reducing Locational Hum?). I'm an idiot... There were people having a lot of issues with warranty repairs on this bass so I was hesitant to touch it incase I had to send it back... That's over now so time to get to work by first adding a wire to bridge the plate to the shielded paint (even though it doesn't seem very effective to me) and seeing if that helps.

    I'll check all the grounds too.
    Last edited: Jun 8, 2020