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Old 2005-06-02, 04:40
BigOldNessie's Avatar
BigOldNessie
Metalhead
 
Join Date: Feb 2003
Location: dallas
Posts: 63
big hum from line out on JCM900

i recently bought a jcm900 and have started recording with it. my current setup.

guitar/jcm900/lineout to us-122 external soundcard/laptop.

the prob is i hear a bigtime hum through the headphones from the soundcard. i even noticed it when the amp is off as long as the soundcard is hooked up to the lineout. when i plug straight in to the soundcard (guitar->soundcard), it's not there. i don't hear it coming from the cab though. just the line out. is this some kind of grounding issue? or do i need another piece of equipment?

my old set up i would just mic my old amp because the lineout wasn't there. but i'd like to use the lineout on the jcm because to get the tone i want it's too loud where i live to mic the amp. any suggestions?
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It was the sick and decaying who despised body and earth and invented the heavenly realm.They wanted to escape their own misery,and the stars were too far for them.So they sighed"Would that there were heavenly ways to sneak into another state of being and happiness!"Thus they invented their sneaky ruses and bloody potions.Ungrateful,these people deemed themselves transported from their bodies and this earth.But to whom did they owe the raptures of their transport?To their bodies and this earth.
 
Old 2005-06-02, 05:09
xdislexicx
TEH PWNZOR!!!1qa
Alumni Staff
 
Join Date: Aug 2003
Location: The West.
Posts: 4,433
sounds like a ground loop to me.
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Old 2005-06-02, 11:39
JerryP's Avatar
JerryP
Metalhead
 
Join Date: Feb 2005
Location: Syracuse, NY
Posts: 75
While your listening to the hum with the amp off try unplugging the amp and see if it goes away. I agree, sounds like a ground loop.
Jerry
 
Old 2005-06-03, 00:08
BigOldNessie's Avatar
BigOldNessie
Metalhead
 
Join Date: Feb 2003
Location: dallas
Posts: 63
yeah, when i unplug it goes away. what do i need to do?
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It was the sick and decaying who despised body and earth and invented the heavenly realm.They wanted to escape their own misery,and the stars were too far for them.So they sighed"Would that there were heavenly ways to sneak into another state of being and happiness!"Thus they invented their sneaky ruses and bloody potions.Ungrateful,these people deemed themselves transported from their bodies and this earth.But to whom did they owe the raptures of their transport?To their bodies and this earth.
 
Old 2005-06-05, 00:55
BigOldNessie's Avatar
BigOldNessie
Metalhead
 
Join Date: Feb 2003
Location: dallas
Posts: 63
just in case anyone else has had this problem.

the signal that i was getting from the line out not only had the huge 60Hz hum but also sounded like total shit. i solved the problem though.

bought this box

am using the the line in from amp to input on box and low z out from box to xlr in on my soundcard. it sounds fucking awesome. huge difference.
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It was the sick and decaying who despised body and earth and invented the heavenly realm.They wanted to escape their own misery,and the stars were too far for them.So they sighed"Would that there were heavenly ways to sneak into another state of being and happiness!"Thus they invented their sneaky ruses and bloody potions.Ungrateful,these people deemed themselves transported from their bodies and this earth.But to whom did they owe the raptures of their transport?To their bodies and this earth.

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