HEADPHONE
LEVEL
POWER
INPUT
SELECTOR
LOW
INPUTS
HIGH
INPUT
STEREO HEADPHONE
OUTPUTS
HA540
pwr
PureClass A Headphone Amplifier
LOW
HIGH
ON
OFF
VDC
www.rolls.com
HA540
Class A Headphone Amp
Bellari is a division of Rolls Corporation Salt Lake City, UT
WWW.ROLLS.COM 6/10
QUICK START OPERATION GUIDE
NOTE: THIS GUIDE ASSUMES THE USER HAS A WORKING
KNOWLEDGE OF AUDIO ELECTRONICS AND PROPER SIGNAL LEVEL
SETTING.
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 Occupational 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
CAUTION: Plugging a mono 1/4” or 1/8” TS plug into the Stereo
Headphone Outputs on the HA540 will cause permanent damage to the
unit because one side would be shorted to ground.
plug into any of the Headphone Outputs THE HA540 WILL BE PER-
plug into any of the Headphone Outputs THE HA540 WILL BE PER-
MANENTLY DAMAGED.
Tip
Sleeve
(ground)
Tip
Ring
Sleeve
(ground)
This is a MONO
jack and should
never be plugged
into the Head-
phone Output of
a HA540.
This is a TRS or
stereo jack that
is compatible
with the HA540
Headphone
Outputs.
WARNING: THE MINIMUM HEADPHONE IMPEDANCE FOR THE
HA540 IS 16 OHMS. THE MAXIMUM HEADPHONE IMPEDANCE IS 2000
OHMS.
IF YOU CONNECT AND USE THE HA540 WITH A LOWER HEADPHONE
IMPEDANCE THAN LISTED ABOVE YOU WILL DAMAGE THE UNIT AND
POSSIBLY OTHER EQUIPMENT THAT IS CONNECTED TO THE HA540.
DO NOT OPEN THE HA540. REMOVING THE UNITS COVER COULD
POTENTIALLY DAMAGE THE UNIT OR CAUSE HARM TO UNQUALI-
FIED PERSONS. HIGH VOLTAGES EXIST INSIDE THE UNIT EVEN
WHEN THE UNIT IS NOT POWERED ON. ALL WARRANTIES ARE
VOID IF ANY INTERNAL COMPONENTS ARE DAMAGED DUE TO
USER ERROR.
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