60hz hum,accoustic guitar,piezo pickup,duet>logic pro

utterdisaster · 16th March 2010, 04:24 PM

I want to record accoustic guitar w/fishman pu. I use adobe duet to interface to Apple's Logic Pro. No problem when I plug in Strat,(wound pu), but with the fishman I get hideous 60hz hum. I know about z mismatch but that usually only effects signal levels and a DI box would fix that. Would a DI with grnd lift eliminate the hum? And would passive work or would I need active?

anickode · 18th March 2010, 02:05 AM

Is that strat a single coil pickup? Or does it have Humbuckers? Anything with a wound coil (including a microphone) will result in the Hum. Hence the purpose of the Humbucker. It "bucks' the hum.

utterdisaster · 22nd March 2010, 08:09 AM

The strat is single coil but it works fine (no hum) in the signal path I described. The hum appears when I plug in an accoustic guitar with a fishman "under saddle" thinline 332 transducer pickup (piezo). For everyones information my mac is laptop & I discovered that if I run it on battery power the hum is almost nil (gone), so that's what I'll do. You are s__t out of luck if running a desktop on ac power.

simon74 · 3rd April 2010, 10:14 PM

hi their ,for acoustics i go to an amp then straight to soundcard ,on pc.
or i have a 2 way mixer unit i have that connected to my souncard ,
and run the acoustic into the mic socket of that ,either way i dont get any hum.
i have an acousic with an under the bridge peizo pickup .
also i make the 3 strings with stick in pickups an they seem fine also .
so personally i would try put somthing inbetween even if a practice amp.
oh and i use head phones to listen to play no speeker output,as i think this would cause little feedback etc .good luck

16th March 2010, 04:24 PM	#1
utterdisaster diyAudio Member Join Date: Mar 2010 Location: Los Angeles	60hz hum,accoustic guitar,piezo pickup,duet>logic pro I want to record accoustic guitar w/fishman pu. I use adobe duet to interface to Apple's Logic Pro. No problem when I plug in Strat,(wound pu), but with the fishman I get hideous 60hz hum. I know about z mismatch but that usually only effects signal levels and a DI box would fix that. Would a DI with grnd lift eliminate the hum? And would passive work or would I need active?

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18th March 2010, 02:05 AM	#2
anickode diyAudio Member Join Date: Mar 2010	Is that strat a single coil pickup? Or does it have Humbuckers? Anything with a wound coil (including a microphone) will result in the Hum. Hence the purpose of the Humbucker. It "bucks' the hum.

22nd March 2010, 08:09 AM	#3
utterdisaster diyAudio Member Join Date: Mar 2010 Location: Los Angeles	The strat is single coil but it works fine (no hum) in the signal path I described. The hum appears when I plug in an accoustic guitar with a fishman "under saddle" thinline 332 transducer pickup (piezo). For everyones information my mac is laptop & I discovered that if I run it on battery power the hum is almost nil (gone), so that's what I'll do. You are s__t out of luck if running a desktop on ac power.

3rd April 2010, 10:14 PM	#4
simon74 diyAudio Member Join Date: Apr 2010	hi their ,for acoustics i go to an amp then straight to soundcard ,on pc. or i have a 2 way mixer unit i have that connected to my souncard , and run the acoustic into the mic socket of that ,either way i dont get any hum. i have an acousic with an under the bridge peizo pickup . also i make the 3 strings with stick in pickups an they seem fine also . so personally i would try put somthing inbetween even if a practice amp. oh and i use head phones to listen to play no speeker output,as i think this would cause little feedback etc .good luck

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