SWR Sound Stereo System PR 644 User Manual

RU-N2N™  
RACK TUNER  
Owner’s Manual  
Features  
 
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1. POWER - Switches the RU-N2N on-off.  
7. NOTE DISPLAY - Indicates the closest note to the played  
note (see FLAT NOTE DISPLAY above).  
2. INPUT - Use either this jack or the rear panel IN jack {8} to  
input your bass signal.  
R e a r P a n e l  
3. MUTE - Disconnects the OUT 2 jack audio output as  
indicated by the MUTE LED, useful for silent bass tuning.  
MUTE can be activated from either the front panel MUTE  
button or a MUTE footswitch (optional), but MUTE can  
only be deactivated by the same switch that activated it.  
4. TUNING LEDs - These 20 LEDs indicate the degree of  
flatness or sharpness of the played note compared to the  
displayed note {7} in 5 cent intervals. The RU-N2N puts on  
a “light show” after 1 minute of no input.  
8. IN - Alternate input jack. This jack is disabled automatically  
if a plug is inserted into the front panel INPUT jack {2}.  
9. OUT 1 and OUT 2 - Connect either of these output jacks  
to your amplifier input: OUT 1 is always active. OUT 2 can  
be disabled by the MUTE-switch {3}.  
5. SWR BADGE - Lights brightly to indicate when the played  
note is “in tune” to the displayed note {7}.  
10. MUTE FOOTSWITCH - Connect a standard latch-type  
footswitch to enable remote audio muting, see MUTE  
{3}. (Mute is active when the footswitch is in the “closed”  
position.)  
6. CALIBRATION MODE and FLAT NOTE DISPLAY -  
Calibration Mode: Adjusts the A4 reference frequency  
(default 440Hz) from 438Hz to 445Hz. Press and hold  
CAL to activate Calibration Mode. While the calibration  
frequency is displayed, press CAL repeatedly to change  
the reference frequency in 1Hz steps. Calibration Mode  
cancels automatically.  
11. MAIN POWER INPUT - Connect the included power cord  
to a grounded AC outlet in accordance with the voltage  
and frequency ratings specified on the rear panel of your  
RU-N2N.  
Flat Note Display: Press CAL to display flats, rather than  
12. MAIN FUSE - Protects the unit from electrical faults.  
Replace a blown fuse only with the type specified on the  
rear panel of your RU-N2N.  
b
#
sharps (“A ” instead of “G ”), as indicated by the LED. Press  
CAL again to cancel.  
 

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