MUSIC HALL ha25.3 User manual

music hall
ha25.3
INSTRUCTION MANUAL
music hall
http://www.musichallaudio.com
headphone amplifier
ha25.3 headphone amplifier

1
Safety Guidelines
Congratulations on Your Purchase
1. Take heed of warnings and instructions
Read all the instructions before connecting or operating the unit.
2. Water and Moisture
3. Object or liquid entry
You have selected a state-of-the-art headphone amplifier. Each component
4. Ventilation
chosen for assembly and construction of the music hall ha25.3 was selected to
provide you with superior performance and the highest level of sound
reproduction available today. We know of no headphone amplifier that costs as
much to produce that sells for so little. Please take a few moments to read over
the instruction manual to ensure that you get the best performance from your unit
and years of trouble-free service.
This product is designed and manufactured to strict quality and safety standards.
However, you should be aware of the following installation and operation
precautions:
Keep this manual so you can refer to these safety instructions. Heed all warnings
and safety information in these instructions and on the unit.
To reduce the risk of fire or electric shock, do not expose the unit to moisture or
water. If the unit is exposed to moisture, immediately disconnect the power cord
from the wall. Take the unit to an authorized music hall service center for
inspection. Do not touch the unit, power cord, or plug with wet hands.
Do not allow foreign objects or liquids into the unit. If this happens, immediately
disconnect the power cord from the wall and take the unit to an authorized music
hall service center for inspection.
You must allow 2 inches (5 cm.) of unobstructed clearance around the unit. Do
not place the unit on a bed, sofa, rug, or similar surface that could block
ventilation from the bottom. Do not stack another component on top of the
amplifier. If the component is placed in a bookcase or cabinet, it must be
ventilated to allow proper cooling.

2
5. Heat
6. Climate
7. Rack and Stands
8. Cleaning
9. Power Sources
10. Power cord protection
11. Non-use periods
Keep the unit away from naked flames, radiators, heat registers, stoves, or any
other heat-producing appliances (including amplifiers).
The unit has been designed for use in moderate climates.
Place the unit on a fixed, level surface strong enough to support its weight. Do
not place it on a moveable cart that could tip over. We recommend only using
stands approved for use with audio equipment.
Unplug the unit from the mains supply before cleaning. The case should normally
require only a wipe with a soft lint-free cloth.
Only connect the unit to a power supply of the type and voltage described in the
operating instructions or specified on the rear panel of the unit.
Connect the unit to the power outlet only with the cord supplied. Do not modify
the supplied cable in any way. Do not attempt to defeat grounding and/or
polarization provisions. Do not use extension cords. Do not route the power cord
where it will be crushed, pinched, bent at severe angles, exposed to heat, or
damaged in any way.
If the unit is to be left unused for a long period of time, the power cord should be
unplugged from the wall outlet.

3
12. Damage Requiring Service
Stop using the unit immediately and have it inspected by an authorized music hall
service center whenever:
1. The power supply cord or plug has been damaged.
2. Liquid has been spilled into the unit.
3. The unit has been exposed to rain.
4. The unit does not operate properly.
5. The unit has been dropped or damaged.
6. Smoke or any unusual smell is detected from the unit.
Getting Started
Thank you for purchasing the music hall ha25.3. The ha25.3 is a headphone
amplifier designed for the music lover. We chose a select group of technologically
advanced components to create this sophisticated headphone amplifier.
Please read this manual carefully. In addition to installation and operating
instructions, it provides valuable information that will help you get optimum
performance from your system. Please contact your authorized music hall dealer
for answers to your questions. In addition, all of us at music hall welcome your
questions and comments. Save the shipping carton and all enclosed packing
material for future use. Shipping or moving the unit in anything other than the
original packing material may result in severe damage that is not covered by the
warranty. Be sure to keep the original sales receipt. It is your best record of the
A Few Precautions
date of purchase, which you will need in the event warranty service is required.
Placement
Use common sense when placing the ha25.3. Always place it on a firm, level
surface. Make sure that the shelf or cabinet can support the weight. Ensure that
there is adequate ventilation around all sides of the unit. Avoid placing the
ha25.3 where it may be subject to excessive heat, such as near a heat register.
Do not place anything on top of it. For best performance, avoid placing the
ha25.3 where it may be subject to vibration, such as near a speaker.

Connecting Source Components to the ph25.3
The ha25.3 has 2 inputs: 1 and 2 .
Connect your source components to the appropriate inputs on the back of the
ha25.3. Choose between the inputs using the selector switch on the front
panel.
input
Line Outputs
The ha25.3 has 2 line outputs: Fixed and Variable.
Connect the desired RCA audio output to the desired audio input on your amplifier,
integrated amplifier,preamplifier, or receiver.
The volume control controls volume for both the headphone output and the
.
variable output.
4
Connecting to the Mains - Plugging In
The ha25.3 is supplied with a power supply suitable for your country´s mains supply
Check the label before connecting to ensure compliance with the mains rating in
your house. Connect the low voltage plug from the power supply to 18V DC
socket on the ha25.3 before connecting to the mains. Plug-in and enjoy.
model: ha25.3

5
Using the ha25.3
headphones
Plug your headphones into headphones socket.
power - on/off
Push the button on the front of the ha25.3 to turn the unit . When the ha25.3
is ; a blue light will appear on the front panel.
on
on
input
Select the input you'd like to listen to : 1 or 2.
volume
connection by unplugging and replugging. Turn the volume control up. If you're
still not getting any sound, check that your source component is properly
connected to one of the ha25.3 inputs and that you've selected the correct input
on the front panel.
If no power, check that the power supply is properly inserted on back of the ha25.3
and that it is plugged into a live socket.
If you're using the ha25.3 in a tape loop and you're getting no output. Check that
you've connected it properly and that the volume control is up on the ha25.3.
Controls volume for both the headphone output and the variable output.
If no sound comes out of the ha25.3 headphone output, check your headphone
Troubleshooting
ha25.3 headphone amplifier

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Line level output
Fix. Out Gain: 0 dB
Var. out Gain: 8,5 dB
Noise floor: 94dBV (A weighted), 90dBV (20Hz-20kHz).
THD: <0,01% 1V/1kHz
Frequency response 15 Hz - 80 kHz (+0.1 - 0.1 dB)
Max. input voltage input potenometer
Max output voltage 9,7Vrms, THD max 1%.
crosstalk: > 76dB, 500mV, 10kHz
Headphone Amplifier
Min. recommended headphone impedance 8ohms
Headphone output power (THD+N 1%) 268mW/300ohms, 770mW/33ohms, 500mW/8ohms
340mW/8ohm - balanced
Signal to noise rao -101dB (100mW/33ohm)
THD +N < 0,06% (100mW/33ohm)
Gain 4 dB (33ohm)
Crosstalk > - 98dB, 100mV, 10kHz
Frequency response 20Hz - 80kHz (+- 0,2dB)
Line level inputs 2 pair RCA sockets
Input impedance 15 kOhm
Fixed output 1 pair RCA socket
Line level output 1 pair RCA socket
Headphone output 1xXLR, 1x 6.3mm jack, 1x 3.5mm jack
Outboard power supply: 18V/1000mA DC
Power consumption: 450mA DC; 0W in standby
Dimension W x D x H 170x 165 x 57 mm
Weight 780 g without power supply
Technical specications

FOR FURTHER INFORMATION CONTACT:
Music Hall
108 Station Road
Great Neck, NY 11023
Tel: [phone]
Fax: [phone]
http://www.musichallaudio.com
Guarantee (US only)
Warranty (US only)
Claims under guarantee(US only)
This entitles you to have the music hall ha25.3 repaired or replaced, at our
discretion, free of charge for one year after purchase, at any authorized music hall
dealer, provided the unit was purchased from an authorized dealer. Your original
sales receipt is used as proof of purchase date. Music hall can take no
responsibility for defects arising from accident, misuse, abuse, wear and tear,
neglect or through unauthorized repair and or adjustment. Neither can music
hall accept responsibility for damage or loss occurring during transit to or from the
person claiming under the guarantee.
Your music hall ha25.3 warranty covers parts and labor costs for one year from
the purchase date. After one year, you must pay for both parts and labor costs.
The warranty does not cover transportation costs at any time.
The unit should be packed in the original packing and returned to the dealer from
whom it was purchased, or to an authorized music hall service center. It should
be sent by a reputable carrier, carriage prepaid. Do not send the unit via USPS
(United States Postal Service). No responsibility can be accepted for the unit
while in transit to the dealer, customer, or authorized service agent, therefore,
customers are advised to insure the unit against loss, damage, or theft while in
transit.
Audio Tuning Vertriebs GmbH
Margaretenstrasse 98
1050 Wien
Austria
http://www.audiotuning.com