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Spider IV 150 Issue - EMG pups not responding well.

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I have a Spider IV combo that is having a problem taking a signal from multiple EMG equipped guitars.  It sounds great with passive pups, but has a severe loss of gain and has a tremolo sounding effect coming through on the higher gain settings.  It sounds fine clean.  I've already tried changing the batteries, factory reset it and updated the software.  I haven't used this amp in a few years.  It used to sound decent with about any guitar. Does anyone have any idea of what could be wrong? 

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Active pups. Pushing too much at the input of the amp.

 

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2 hours ago, psarkissian said:

Active pups. Pushing too much at the input of the amp.

 

Thank for the response.  Interesting thing: I've had the amp for many years, about two months after its release.  I'ts never had a problem with EMG pickups until recently.  Could something have changed with the amp?

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Yes, active pups slowing stressing the input circuit over time. Active circuit guitar on one supply rail going into active circuits in an amp on a different supply rail can be a bit of a stress on on of them.

 

And it's an older product, so there is that to consider as well.

 

 

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9 hours ago, psarkissian said:

Yes, active pups slowing stressing the input circuit over time. Active circuit guitar on one supply rail going into active circuits in an amp on a different supply rail can be a bit of a stress on on of them.

 

And it's an older product, so there is that to consider as well.

 

 

I've hardly used this amp.  And when I did, I've almost always used passive pickups.  Sounds like a poorly engineered input circuit to me.  The amp was manufactured on 12/12/2011.  When I think of an "older" amp, I think of my 1974 Fender Vibro-Champ, not one that is less than 8 years old.  EMG has been making active pickups since 1981.  I'm not sure why it takes more than 30 years to catch up with that technology.  Especially from a company that builds equipment that is marketed to be technologically advanced.  There are many reasons why I was unimpressed with this amplifier to begin with, so it sat for a long time until I was offered a trade for it along with the FBV Shortboard MKII.  I'm no longer unimpressed.  Now I am extremely dissatisfied.  No more Line 6 products for me.  Thank you for your time. 

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This is an old problem, too - the solution is to use a stompbox pedal (guitar>stompbox>amp) that does not have 'true bypass' to buffer the signal.  First read it here on these forums many years ago.

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