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M3 Phono - loading

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Posted on December 5, 2013 at 20:07:48
Paul Folbrecht
Audiophile

Posts: 1403
Location: Midwest
Joined: June 30, 2006
 Could someone please give me detailed instructions on how to install loading resistors at the inputs of an M3?

I am using a LOMC cart (Ortofon) directly into the M3. There is enough gain. The cart really wants 100R but it sounds great even at 47K!

 

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RE: M3 Phono - loading, posted on December 18, 2013 at 14:49:50
xaudiomanx
Audiophile

Posts: 3647
Joined: August 16, 2004
 Paul(same name as mine),

I am not all that familiar with changing the loading on your phono preamp but if it sounds good with 47K why not leave it alone? Just because the manufacturer suggests a 100R load doesn't necessarily mean it's used. With that being said, loading is a suggestive rolloff of certain signals to make the cartridge stay within a certain sonic frequency response. Sorta like a brake on cars. It tells the cartridge where to stop.

Now with that being said, find the 47K loading resistor and put the 100R resistor right across it. It then becomes a 100R load. See how it sounds but it will be much lower in volume, so be prepared for that.

After you try a 100R resistor go to a 1K ohm resistor and try it. See how that sounds.

Koetsu requires a 100R loading but it did sound better in my system with a 1K ohm load.

You can play but in the end forget about what the manufacturer suggests and see how it sounds.

 

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