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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
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:
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.
Never plug a mono
Never plug a mono
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.
MANENTLY DAMAGED.
Tip
Sleeve
(ground)
Tip
Ring
Sleeve
(ground)
This is a MONO
jack and should
never be plugged
into the Headphone Output of
a HA540.
This is a TRS or
stereo jack that
is compatible
with the HA540
Headphone
Outputs.
WARNING:
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 UNQUALIFIED 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.
Bellari is a division of Rolls Corporation
Salt Lake City, UT
9/12
SPECIFICATIONS
Input Impedance: 47k ohms
Output Impedance: 16 ohms
Max Output Level: +15dBv @ 1kHz at .1% dist.
THD: .05% @ 1KHz
S/N Ratio: >80 dB unweighted
Indicator: 1 Power LED
Max Output Power: up to 500 mW/side, 1 W/Stereo ( @ 16 Ohms )
Frequency Response: 5 Hz - 30 kHz
Phase Shift (In to Out): 0 db
Crosstalk: - 75 dB
Headphone impedance: 16 Ohms to 2000 Ohms
Max Input Level: +15 dBV
Input Connectors: LOW: RCA, 1/8" (3.5mm)Stereo; HIGH: RCA
Outputs: 1: 1/4" TRS Stereo jack
1: 1/8" (3.5 mm) TRS Stereo jack
PWR: 12 - 15 VDC
Size: 6"w x 2.5"h x 5.4"d
Weight: 2 lb.
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INTRODUCTION
Thank your for your purchase of the Bellari HA540 Pure Class A Headphone
Amplifi er. The HA540 is a stereo headphone amplifi er with separate high and low
level inputs.
INSPECTION/WARRANTY
1. Unpack and inspect the HA540 box and package.
Your HA540 was carefully packed at the factory in a protective carton. Nonetheless, be sure to examine the unit and the carton for any signs of damage that
may have occurred during shipping. 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 web site at www.rolls.com and click on the Register Your Warranty Here text. Fill out the warranty information to ensure coverage of your new
Rolls product.
DESCRIPTION/CONNECTION:
LOW LEVEL INPUTS: RCA's or 1/8" stereo input for connection to Ipod or other
low line level inputs.
HIGH INPUT: RCA's for connection to your CD player or other line level inputs.
STEREO HEADPHONE OUTPUTS: 1/4" stereo and 1/8" stereo jacks for con-
nection to stereo headphones.
HIGH/LOW SELECTOR SWITCH: This switch selects between the HIGH INPUT
or LOW INPUTS.
HEADPHONE LEVEL: This volume control is for the STEREO HEADPHONE
OUTPUT LEVEL.
VDC: For connection to the included power supply. WARNING: USE ONLY THE
FACTORY SUPPLIED POWER SUPPLY. USING A IMPROPERLY POLARIZED
OR WRONG VOLTAGE SUPPLY MAY DAMAGE THE HA540.
POWER: For turning the power on or off to the HA540.
pwr: When lit indicates that power is supplied to the HA540.
HIGH-LOW EXPLANATION: The LOW is a more sensitive input to
pick up the output of devices that have a lower level like an Ipod or Zune players.
These devices usually run off an internal battery and have a lower output than
traditional line level. The HIGH level is designed to be used with CD players,
Phonograph Preamps or other equipment that has a proper line level output.
These devices tend to be higher in level than an Ipod or other battery operated
device and would work better when using the HIGH INPUT. Again it is best to use
the HIGH or LOW input that sounds best for your application. Let your ears be
the judge not product specs.
BUZZING: Your HA540 will buzz when you listen to headphones with nothing
plugged into the input selected. The unit needs something to be plugged into the
input that is selected to complete the circuit. Without a device connected to the
selected input the HA540 WILL BUZZ AND GENERATE A VERY UNPLEASANT
SOUND THRU THE HEADPHONES. IT IS RECOMMENDED THAT YOU CONNECT ALL THE INPUTS AND OUTPUT BEFORE POWERING ON THE UNIT.
AGAIN IT IS NORMAL OPERATION TO BUZZ WITHOUT AN INPUT!
Disclaimer:
Training and operation is the dealers responsibility. At Bellari we do not sell
directly to customers. We have factory authorized dealers and it is the dealers responsibility to gather your equipment list and recommend proper products to the
consumer. Do not call the Bellari factory and expect help with your setup. We rely
on our dealers to do such work. There is only so much that can be done over the
phone, so PLEASE CONTACT YOUR LOCAL DEALER WITH QUESTIONS. If
you have purchased your item online or used, you are on your own. WE HIGHLY
RECOMMEND THAT IF YOU ARE NOT FAMILIAR WITH SUCH PRODUCTS TO
PLEASE BUY THEM FROM A REPUTABLE, FACTORY AUTHORIZED DEALER
THAT OFFERS CUSTOMER SUPPORT.
FAQ:
Q: Does the tube need time to warm up before use?
A: Yes, it will be usable in about 30 seconds. Longer warm up times are
not needed, there is no benefi t to warming the tube up longer than 60
seconds. (warm up) simply means powering the unit on.
Q: What is the life expectancy of the vacuum tube in the HA540?
A: 10 to 50 years (or longer if you do not use the unit very often) if you
use it more often it will have a shorter life, like a light bulb. 10 years if
you have the unit on 24/7 every day all the time. 15 years if you use the
unit once a day. 25 years if you use the unit a couple times a week. More
than 40 years if you use the unit a few times a month.
FAQ:
Q:What is a N.O.S. tube?
A: N.O.S. refers to (new old stock) it is a tube that was manufactured
long ago and never used. These tubes are very sought after. They may
or may not sound any better, but it is generally thought that most N.O.S.
tubes are better in many ways over new foreign manufactured tubes.
Q: What kind of tubes can I use in the HA540?
A: Tubes that can be used in the HA540 are:
12AX7 - The industry standard for preamp tubes.
12AX7A - Same as a 12AX7 but generally has a slightly higher output.
7025 - This is the Military part number for a 12AX7.
ECC83 - This is the same as a 12AX7 it is the European part number.
12AX7WA - This is a 12AX7 with slightly lower output.
5751 - This is a Military part number for a 12AX7WA.
There are many other tubes that can be used, but you get where this is
going they are essentially the same tube with different part numbers doing almost exactly the same thing.
Q: What is the best sounding tube I can get for the HA540?
A: This is an unanswerable question. Everyone has different tastes. It
is up to the individual to decide as all tubes sound slightly different. For
me the best tube I have ever heard in a HA540 was a N.O.S. Telefunken
tube.
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