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Old 10-22-2021, 08:25 PM
ATC2 ATC2 is offline
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Default Switching phono inputs

Okay Iíve been wondering about this for a while now. I have a high output MC cartridge that should be plugged in to the MM input of my phono preamp. One day I accidentally plug it to the MC input, and it sounded notably better. I then later switched back concerned that something could get damaged since itís not the correct setup.
So ever since, Iíve wondered if this is an option or can something get messed up?
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Old 10-22-2021, 09:17 PM
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audio bill audio bill is offline
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Since high output MC cartridges are designed to be used into MM phono inputs, it's their output level as well as loading that are properly matched when connected accordingly. If you connect it to the MC input the signal will be given more gain than is necessary so the signal could become overdriven and distorted. The loading is generally different as well so the cartridge may be operating into a less than optimal load which can further affect its output from the ideal. Most listeners will prefer a louder level when compared to lower, so I have to wonder if that's why you found it notably better sounding when connected to the MC input due to its additional gain. To be fair you should compare them at the same volume level, even though you'll have to turn the volume control to a much higher setting when feeding the MM input to match volume of the MC input. Be careful if you continue to listen to the cartridge into the MC input to be sure that you're not getting any distortion artifacts. You're definitely safer running it as recommended into the MM input.
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Old 10-22-2021, 10:10 PM
ATC2 ATC2 is offline
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Quote:
Originally Posted by audio bill View Post
Since high output MC cartridges are designed to be used into MM phono inputs, it's their output level as well as loading that are properly matched when connected accordingly. If you connect it to the MC input the signal will be given more gain than is necessary so the signal could become overdriven and distorted. The loading is generally different as well so the cartridge may be operating into a less than optimal load which can further affect its output from the ideal. Most listeners will prefer a louder level when compared to lower, so I have to wonder if that's why you found it notably better sounding when connected to the MC input due to its additional gain. To be fair you should compare them at the same volume level, even though you'll have to turn the volume control to a much higher setting when feeding the MM input to match volume of the MC input. Be careful if you continue to listen to the cartridge into the MC input to be sure that you're not getting any distortion artifacts. You're definitely safer running it as recommended into the MM input.
I agree Bill, itís the same thought process that I had. This happened a while ago and Iíve had it connected properly since, the curiosity remained if was something one can get away with. And yes basically it did sound louder not necessarily better, this what made me check and find that I had connected it incorrectly. I believe had I left it like that something wouldíve eventually been damaged, I guess it was a good thing I didnít.
Thanks for the reply.
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