Music Hall Portable Multimedia Player DAC 253 Black User Manual

music hall  
dac25.3  
usb/tube 24bit 192kHz digital to analog converter  
INSTRUCTION MANUAL  
volume  
phones  
coa- opt- usb xlr  
lock 96k 192k  
on/off  
input  
src  
dac25.3 digital to analog converter  
music hall  
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Congratulations on Your Purchase  
You have selected a state of the art digital-to-analog converter (DAC). Each  
component chosen for assembly and construction of the music hall dac25.3 was  
selected to provide you with superior performance and the highest level of sound  
reproduction available today. We know of no digital-to-analog converter 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.  
Safety Guidelines  
This product is designed and manufactured to strict quality and safety standards.  
However, you should be aware of the following installation and operation  
precautions:  
1. Take heed of warnings and instructions  
Read all the instructions before connecting or operating the unit.  
Keep this manual so you can refer to these safety instructions. Heed all warnings  
and safety information in these instructions and on the unit.  
2. Water and Moisture  
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.  
3. Object or liquid entry  
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.  
4. Ventilation  
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.  
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5. Heat  
Keep the unit away from naked flames, radiators, heat registers, stoves, or any  
other heat-producing appliances (including amplifiers).  
6. Climate  
The unit has been designed for use in moderate climates. Do not attempt to use  
below 41 degrees Fahrenheit (5 degrees Celsius) or above 95 degrees Fahrenheit  
(35 degrees Celsius).  
7. Rack and Stands  
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.  
8. Cleaning  
Unplug the unit from the mains supply before cleaning. The case should normally  
require only a wipe with a soft lint-free cloth.  
9. Power Sources  
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.  
10. Power cord protection  
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.  
11. Non-use periods  
If the unit is to be left unused for a long period of time, the power cord should be  
unplugged from the wall outlet.  
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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.  
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE  
COVER. NO USER-SERVICEABLE PARTS INSIDE. REFER SERVICING TO  
QUALIFIED SERVICE PERSONNEL.  
Getting Started  
Thank you for purchasing the music hall dac25.3. The dac25.3 is a tube digital-  
to-analog converter (DAC) designed for the music lover. We chose a select group  
of technologically advanced components to create this sophisticated digital-to-  
analog converter. The dac25.3 can accept any coax (s/pdif), USB, XLR, or optical  
digital input from one of music hall's compact disc players, a CD/DVD transport,  
iPod transport, computer, media server, Sonos, Squeezebox, DVD in stereo, and  
will output two channel stereo analog. When used with your computer or in a  
top-end audio system, your music hall digital-to-analog converter will provide  
years of listening enjoyment.  
The dac25.3 features the latest Texas Instruments (formerly Burr-Brown) PCM  
1796 24bit, 192kHz, advanced segment, stereo audio digital-to-analog converter.  
This processor features 123dB dynamic range, an 8 x oversampling digital filter,  
and just 0.0005% THD. The dac25.3 upsamples to either 96kHz or 192kHz; user  
selectable on the front panel. To achieve the best sound, we use an advanced  
asynchronous reclocking and anti-jitter control system upstream of the PCM1796  
digital-to-analog converter. For this system, we are using the Philips 74HC574 in  
conjunction with the Texas Instruments SRC4192 Asynchronous Sample Rate  
Converter, whose master clock is a high precision active crystal oscillator. The  
dac25.3 also features a large, high current oversize power supply and a tube  
output for warm rich sound. A headphone output is provided for convenient  
personal listening.  
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A Few Precautions  
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  
date of purchase, which you will need in the event warranty service is required.  
Placement  
Use common sense when placing the dac25.3. 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  
dac25.3 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  
dac25.3 where it may be subject to vibration, such as near a speaker.  
Digital In - Connecting Source Components to the dac25.3  
VOLTAGE SELECTOR  
MODEL: dac25.3  
SERIAL NO.:  
Designed and developed in the USA  
~115V  
~230V  
AUDIO OUT  
RCA  
DIGITAL IN  
XLR  
XLR  
XLR  
OPT-  
L
USB  
COA-  
R
R
L
The dac25.3 has 4 digital inputs: coax (s/pdif), optical, USB, and XLR.  
Connect your source components to the appropriate inputs on the back of the  
dac25.3. You can connect one or all four inputs at the same time. Choose  
between the inputs using the input selector button on the front panel.  
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Special note: When using the USB input with your computer; the dac25.3 and  
your computer should both be powered up. Your computer will recognize the new  
hardware and self install the necessary drivers.  
Connect the USB cable to the dac25.3 from your computer prior to launching your  
audio player software: iTunes, Windows Media, Real Media, etc. If you haven't  
followed this instruction, close your audio player software, then re-launch.  
You will probably find that setting your audio player's and computer's volume to  
max will sound best.  
Apple Computer Users:  
With both your computer and the dac25.3 powered on; connect the USB cable.  
Go to System Preferences  
Sound  
Output  
choose the USB Audio DAC for  
output. Close System Preferences. Launch iTunes.  
Audio Out  
To avoid damage to the dac25.3, make sure it is NOT plugged into an AC outlet  
while connecting up or disconnecting either of the audio outputs. The dac25.3  
has two sets of fixed audio outputs on the back. One single ended set labeled  
RCA: R and L. And one balanced set labeled XLR: R and L. Connect the RCA or  
XLR audio outputs to the correct audio inputs on your integrated amplifier,  
preamplifier, or receiver.  
The phones (headphone) output on the front is variable.  
Connecting to the Mains - Plugging In  
Check that the Power Switch on the front of the dac25.3 is in the off position.  
Look at the voltage selector slider on the back of the unit and confirm that it is  
set for the correct voltage: (~115V USA/~230V Europe). Push the plug (IEC line  
socket) of the power cable supplied with the dac25.3 into the socket AC IN on  
back of the unit. Make sure it is pressed in firmly. Plug the other end of the  
power cable into an AC wall outlet.  
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Using the dac25.3  
volume  
phones  
coa- opt- usb xlr  
lock 96k 192k  
on/off  
input  
src  
dac25.3 digital to analog converter  
power - on/off  
Push this button on the front of the dac25.3 to turn the unit on. Pushing it again  
will switch the dac25.3 off. When the dac25.3 is on; a blue light will appear on  
the front panel below the digital input that is currently active. If no digital input is  
active the src lock light will flash.  
input  
Use this button to toggle between the digital inputs: coa-, opt-, usb, xlr.  
src (sample rate converter) - upsampling  
Use this button to toggle between the different sample rates:  
Lock: locks at input audio bit rate and sampling rate (upsampling off - bypasses  
SRC4192)  
96k: 24bit, 96kHz (upsampling on 96kHz)  
192K: 24bit, 192kHz (upsampling on 192kHz)  
Decide which sample rate sounds best on your system by listening.  
phones  
1/4" headphone output.  
volume  
Controls volume of the headphone output only.  
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Troubleshooting  
If no sound comes out of the system with the dac25.3 connected, there are  
several areas to check. Either you are not getting an audio signal to your  
preamplifier, or you don't have a good digital source feeding the dac25.3.  
First, check to make sure your preamplifier, integrated amp, or receiver is  
switched to the same input the dac25.3 is connected to. Test the connection and  
the cables to make sure. Keeping the input selected and using the same cable,  
connect this input to a known good source like a tuner or the analog output of a  
CD player. If that works, then it is most likely not a connection problem between  
the dac25.3 and the preamp, integrated amp, or receiver.  
The next step is to check and see if the digital input is properly connected. Look  
on the front panel of the dac25.3 to see if the lock light is illuminated. If it is not,  
this is most likely the problem. Push the input selector and toggle through all the  
inputs to see if one locks. If one does not lock, you either have a bad digital cable  
or you aren't getting a good digital signal. Try replacing the digital cable on the  
input you've selected. For instance, if you are using a coax connection try  
replacing the coax cable with another coax cable. If this doesn't work, try  
selecting a different input (optical for instance) and try using the CD player's  
optical output with an optical cable instead.  
If you are using a USB connection, it is necessary for the computer to recognize  
the dac25.3 as a connected device. Check in the computer's control panel under  
USB devices and see if the dac25.3 is recognized. If not, with both the dac25.3  
and your computer powered up, remove the USB cable from the computer and  
then re-insert it. Watch the computer monitor for an indication it has found the  
hardware. Apple computers may not automatically recognize the dac25.3. Apple  
users check your System Preferences as suggested above.  
If the lock light is lit and you're not getting any output, plug in a set of  
headphones and turn up the volume to hear if you're getting any output. If you  
are getting output through the headphones and you've verified that your cable is  
good and properly connected to the correct input on your preamp, integrated, or  
receiver, it's possible the tube is not properly seated in the tube socket or it has  
failed. If you are familiar with tubes and comfortable checking it, please do. If  
not, call your dealer or music hall for guidance.  
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Technical Specifications  
THD+N: ..................................................................... <0.04% Tube out (1KHz)  
<0.0015% Balanced out (1KHz)  
Output level: .............................................................................................. 2.0V  
Frequency response: ......................................................... 2Hz~20KHz +/-0.2dB  
SNR: .................................................................................................... >110dB  
Power dissipation: ................................................................................... <30W  
Dynamic range: ....................................................................... > 120dB (24 bit)  
> 96dB (16bit)  
Crosstalk: ............................................................................................ <-110dB  
Operating temperature: ........................................................................ 0 ~ 40  
USB input: ............................. supports 24-bit audio at sample rates up to 96kHz  
All other inputs: ........................ accept 24-bit audio at sample rates up to 192kHz  
Headphone output level: ........................................................................ 4V max  
Headphone output resistance: ............................................................... 0.3 ohm  
Power supply: .......................................................... AC115V/60Hz - 230V/50Hz  
Ti PCM1796 24bit, 192kHz DAC  
Philips 74HC574  
Ti SRC4192 Asynchronous Sample Rate Converter w/high precision active crystal  
oscillator master clock.  
1 x 6922 Electro-Harmonix tube  
Physical  
Dimensions: ..................................................... W x D x H (8.5 x 13.5 x 3.75 in.)  
Weight: ........................................................................................... 10 lbs. Pkg.  
Supplied Accessories: ....................................................................... Mains Lead  
USA - This product complies with FCC requirements.  
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Guarantee  
This entitles you to have the music hall dac25.3 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.  
Warranty  
Your music hall dac25.3 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.  
Claims under guarantee  
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.  
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For further details contact Music Hall LLC:  
108 Station Road  
Great Neck, NY 11023  
Tel: 516-487-3663  
Fax: 516-773-3891  
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