Rolls RA62c User manual

RA62c
Six Channel
Headphone Mixer/Amplifier
ROLLS CORPORATION
SALT LAKE CITY, UTAH
5/03 OWNERS MANUAL
SCHEMATIC
SPECIFICATIONS
Input Impedance: 10K Ohms unbalanced
Max Input Level: +18 dBV
Input Connectors: 1/4" TRS stereo, R & L bal. / unbal. 1/4"
RCA, R & L balanced XLR
6: 1/4" TRS Direct Input jacks
Outputs: 12: 1/4" TRS Stereo jacks
6: 1/8" (3.5 mm) TRS Stereo jacks
Max Gain: 20 dB/Channel
Max Output Power: up to 300 mW/side, 600 mW/Channel ( @ 16 Ohms )
Frequency Response: DC - 30 kHz
S/N Ratio: 90 dB
THD: <.008%
IMD: <.008%
Phase Shift (In to Out): 0 deg.
Slew Rate: 25 V per microsecond Second
Crosstalk: - 65 dB
Power 12 VAC (Rolls Model PS12)
Weight: 7 lbs (3KG)
Size: 19” x 1.75” x 6.5” (48cm x 4.5cm x 17cm)

INTRODUCTION
Thank you for your purchase of the Rolls RA62c Stereo Headphone Amplifier. The ROLLS
RA62c is a six-channel headphone/earphone amplifier for professional audio monitor-
ing. A variety of input options are available including 1/4”, RCA, and balanced XLR. Since
the MONO/STEREO switch is after the pan control, it will mix 2 MONO signals and their
balance can be adjusted with the Pan control. With the addition of rear panel Direct Input
connectors, each channel may mix a second stereo signal.
This manual assumes the user has a basic knowledge of audio electronic equipment.
INSPECTION/WARRANTY
1. Unpack and inspect the RA62c box and package.
If obvious physical damage is noticed, contact the carrier immediately to make a damage
claim. We suggest saving the shipping carton and packing materials for safely transporting
the unit in the future.
2. Please visit our website at www.rolls.com and click on the Register Your Warranty
Here text. Fill out the warranty information to ensure coverage of your new RA62b.
WARNING
USING THIS SYSTEM AT EXCESSIVE VOLUMES CAN CAUSE
PERMANENT HEARING DAMAGE.
USE AS LOW A VOLUME AS POSSIBLE
In order to use this system safely, avoid prolonged listening at excessive sound
pressure levels. Please use the following guidelines established by the Occupa-
tional Safety Health Administration (OSHA) on maximum time exposure to sound
pressure levels before hearing damage occurs.
90 dB SPL at 8 hours
95 dB SPL at 4 hours
100 dB SPL at 2 hours
105 dB SPL at 1 hour
110 dB SPL at 1/2 hour
115 dB SPL at 15 minutes
120 dB SPL - avoid or damage may occur
DESCRIPTION
FRONT PANEL
Note: Descriptions for Channel One through Channel Six are identical.
OUTPUTS 1 - 6 : 1/4” and 1/8” (3.5 mm) Tip-Ring-Sleeve jacks for connection to a stan-
dard pair of headphones or earphones. These jacks may be used simultaneously.
CLIP: Red LED indicating circuit overload in that channel.
MIX: Adjusts the relative amount of signal from the Main Inputs and the Direct Input of that
channel.
VOLUME 1 - 6: Controls the amount of output signal from the indicated channel.
MONO/STEREO SWITCH: When this switch is pressed in, the Right and Left channels are
summed together providing a mono output signal.
MAIN INPUT PAN: Controls the relative amount of Right/Left signal sent to the Output
channels from the Main Input.
MAIN INPUT: 1/4” TRS input jack - parallels the rear panel Right and Left 1/4’ Input jacks.
POWER: Push switch - turns the RA62c on and off.
POWER LED: Indicates that the RA62c is connected to the power supply and is on.
REAR PANEL
12 VAC INPUT: Connects to the Rolls PS12 AC adapter (Included).
INPUTS:Left and Right - Balanced XLR jacks
- 1/4” Balanced / Unbalanced jacks
- RCA Unbalanced jacks
Note: Descriptions for Channel Six through Channel One are identical.
DIRECT INPUT: 1/4” TRS jacks which directly access the channel’s heaphone output
circuitry, and is mixed to the corresponding channel via the channel’s MIX control. This is a
stereo jack and requires a TRS stereo signal.
OUTPUT: 1/4” TRS jack - parallels the channel’s front panel 1/4” Output jack.
CONNECTION
Connect the AC adapter to an outlet with the proper voltage.
Determine which input configuration you will use; either discreet right/left, TRS stereo, or
mono.
For a discreet right/left input configuration, connect a balanced XLR, 1/4”, or RCA plug
containing the ”Right” portion of the stereo signal to the Right Main Input. Connect a bal-
anced XLR, 1/4”, or RCA plug containing the “Left” portion of the stereo signal to the Left
Input.
For a TRS stereo input configuration, connect a Tip-Ring-Sleeve stereo plug into the
front panel STEREO IN Input, or the rear panel LEFT Input. This cable may come from a
mixer’s headphone output for example.
To send a mono signal to the RA62c, connect an XLR jack to either Main Input, or a single
1/4” Tip-Sleeve plug into rear panel Right Input and press in the front panel MONO/STE-
REO switch. This mono signal will be fed to both the right and left sides of the headphone
outputs.
DIRECT INPUTS
The unique RA62c Direct Inputs have been provided as a way for you to mix a separate,
stereo signal with the Main Input signal - giving each listener their own custom headphone
mix.
To utilize this feature - connect a 1/4” TRS stereo signal, such as a
monitor mix, to the listener’s Direct Input. Mix the Main Input signal
with this Direct Input signal via the front panel MIX control
CAUTION: Plugging a mono 1/4” TS plug into the Headphone Outputs may
cause permanent damage to the unit because one side would be shorted to
ground. NEVER PLUG A MONO PLUG INTO ANY OF THE HEADPHONE
OUTPUTS.
Tip
Ring
Sleeve
(ground)