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Connection guide
HA543 Headphone Amplier
SPECIFICATIONS
Input Impedance: 10K Ohms unbalanced - 20K Balanced
Max Input Level: +14 dBV
Input Connectors: RCA, XLR balanced
Outputs: 1: 1/4" TRS Stereo jacks
1: 1/8" (3.5 mm) TRS Stereo jacks
Max Gain: 20 dB
Output Power: 326 mW/side, 652 mW/Channel (62 Ohms)
Frequency Response: 3 Hz - 59 kHz +/- 3 db
S/N Ratio: 92 dB
THD: <.008%
IMD: <.008%
Phase Shift (In to Out): less than 10 deg.
Slew Rate: 2 V per microsecond
Crosstalk: - 75 dB
Power VDC (Power Supply Included)
Weight: 1 lb
Size: 4.5” x 1.5” x 3”
Headphone impedance: 8 Ohms to 600 Ohms
Salt Lake City, UT
11/18
What's in the box?
1 - Made in USA HA543
1 - 15V power supply PN PS27s
1 - This owners manual
1 - Love for great audio
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WARNING
USING THIS PRODUCT 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 Headphone Out-
puts on the HA543 will cause permanent damage to the unit because one side
would be shorted to ground. Never plug a mono plug into any of the Head-
phone Outputs THE HA543 WILL BE PERMANENTLY 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 HA543.
This is a TRS or
stereo jack that
is compatible
with the HA543
Headphone
Outputs.
WARNING: THE MINIMUM HEADPHONE IMPEDANCE FOR THE HA543 IS 8
OHMS. THE MAXIMUM HEADPHONE IMPEDANCE IS 600 OHMS.
The warning section of the manual. Boring, but hey
we care about your hearing.
Thank you for purchasing the HA543. We spent a consider-
able amount of time designing and developing the HA543.
Hundreds of hours listening and improving the design. We
hope you enjoy using the HA543, and that it makes listen-
ing to your vinyl collection rewarding. We sincerely appreci-
ate the opportunity to build a product for you and participate
in your love of quality music and sound. We love what we
do and we’re happy to help. All Bellari products are hand
built in Salt Lake City, Utah by people who care about high
quality music.
1 - Connect your source to the HA543’s “in” RCA
jack or XLR jacks.
2 - Connect the supplied PS27s adapter to the
jack labeled “POWER.” Do not use any other
adapter, or the unit might not be happy and you would need
some repair work done. Reversed polarity adapters will
cause damage.
3 - Optional: Connect the RCA out to
your other equipment (this is also called a pass thru or
preamp out).
4 - Connect your headphones to the jack, marked “head-
phone”. You can use eigther the 1/8” or 1/4” jack or both at
the same time. When using the headphone the RCA “out”
is still active. The “mute” switch will only mute the head-
phones the RCA out is always active.
5 - Use the “enhance” switch to get the desired listening
experince.
6 - Enjoy your music.
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power
HA543
The Enhance takes low quaility headphones that
are not very fun to listen to, and makes them much
more entertaing to the listener. Switch in is active
(it will be obvious) when out the HA543 is 100%
completely at.
Headphone output’s
1/4” Stereo, and
1/8” stereo jack’s for
connection to stereo
headphones. Can be
used at the same time.
Mutes both
headphone
jacks when in
headphone
headphone amplifier
Mute
Adjusts the
level of signal
sent to the
headphones
Volume
MADE IN USA
Enhance
Hard wired power
switch. When out the
connection from the
power adapter is com-
pletely disconected.
Power LED.
Power
HA543
Power input is 9-15
VDC for connec-
tion to the external
Rolls PS27s power
adapter.
HA543
power
right in left in
Ballanced XLR line level
inputs for connection to
a source with ballanced
outputs. When a signal is
present on the XLR’s signal
is sent to the RCA out’s.
out
in
Stereo RCA output used
as a pass thru so you
can use the HA543 as a
headpne amp and still
send the main signal out
to other equipment.
RCA stereo jack for
connection to a line
level source such
as a DAC, phone
output, CD player or
computer, etc.
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