Owner's Manual

JC 3+ Input Settings

Cartridge Select Switch

Each channel module has a three position Cartridge Select switch to select an MM moving

magnet or MC moving coil phono cartridge.

The Cartridge Select switch has two MC settings: Variable 50-550Ω and Fixed 47kΩ.

Note: Switch and knob settings should be the same for both channels.

Select the setting that matches your turntable’s cartridge type. If you are unsure which setting is

best for your equipment you might want to check it on the cartridge manufacturer’s website. You

may also experiment and use another setting which sounds the best in your system.

 For moving magnet cartridges. It provides a 47k ohm load and appropriate gain for all

MM cartridges.

MC Variable 50-550Ω

 Accommodates the vast majority of moving coil cartridges. It provides the higher gain

required for very low output MC cartridges. This setting works in conjunction with the

adjacent Impedance Adjust control. Details are below.

MC Fixed 47kΩ

 Provides the appropriate gain for MC cartridges with an alternative 47k ohm load. You

can try the 47kΩ settings to see which sounds best in your system.

MC 47k Fixed is also the load that Grado and Soundsmith recommend for their Moving

Iron (MI) cartridges.

Setting the Impedance Adjust Control (MC Variable 50-550 Ω)

Most MC cartridges will thrive with a setting of 100 ohms. The JC 3+ Impedance Adjust knob

enables you to fine tune the input impedance for MC cartridges over a range of 50 ohms to 550

ohms. Cartridge makers generally specify what they consider to be an optimal load impedance.

However, their spec might not give you the best results in your system. We encourage you to

experiment with this control and use whichever load impedance you feel results in the best

performance of your system in your listening room. For some JC 3+ users the sonic differences

will be subtle.

Audio Output Connections

The JC 3+ Output Jacks connect to the input jacks on your line level preamplifier. Each JC 3+

module has two output jacks, one balanced XLR jack and one unbalanced RCA jack. The

balanced and unbalanced jacks are active simultaneously. If your line level preamplifier is

equipped with balanced XLR inputs we recommend using the JC 3+ Balanced XLR output jacks

for the maximum rejection of external noise sources.