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Author Topic: Roland JC120 - Split Line Out for Stereo?  (Read 160 times)

vin97

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Roland JC120 - Split Line Out for Stereo?
« on: July 28, 2021, 07:49:26 AM »
Hello.

I have a 76 JC120 and it only has a mono line out, where both outputs are merged at the jack.
Can I just solder them to separate jacks or could this cause problems for the power amps?

Jazz P Bass

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Re: Roland JC120 - Split Line Out for Stereo?
« Reply #1 on: July 28, 2021, 11:28:34 AM »
The Line Out circuit uses 2 47K and 1 100ohm resistors for the summing network.
You can disconnect R155 and add a 100 ohm resistor to ground to get a separate feed.

vin97

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Re: Roland JC120 - Split Line Out for Stereo?
« Reply #2 on: July 28, 2021, 11:54:21 AM »
Nice, thanks!
Will have to see if I have a 100 ohm resistor around.
What would happen if I leave it out?

Jazz P Bass

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Re: Roland JC120 - Split Line Out for Stereo?
« Reply #3 on: July 29, 2021, 12:57:51 AM »
"What would happen if I leave it out?"

You will not have a proper 'voltage divider' circuit.

vin97

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Re: Roland JC120 - Split Line Out for Stereo?
« Reply #4 on: July 29, 2021, 06:22:24 AM »
So more volume but higher impedance?
Any chance of hurting the amp?

Because higher level on the line out would be pretty nice. At the moment it is extremely low, basically instrument level. I have to route it through an external headphone amp to get usable levels.

Jazz P Bass

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Re: Roland JC120 - Split Line Out for Stereo?
« Reply #5 on: July 29, 2021, 12:00:44 PM »
I am simply going by Roland's recommended values.
Leaving out the ground resistor defeats the divider circuit.

Play with the values if you like.
https://ohmslawcalculator.com/voltage-divider-calculator
« Last Edit: July 29, 2021, 12:07:25 PM by Jazz P Bass »