NuForce DAC-9 User manual

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382 South Abbott Avenue, Milpitas, CA 95035, USA • PHONE: [phone] •FAX: [phone]
nuforce.com •EMAIL: [email protected] •Skype: nuforce-sales
FCC Notice - Declaration of Conformity Information
This equipment has been tested and found to comply with the limits for a Class B digital device,
pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection
against harmful interference in a residential installation. This equipment uses and can radiate radio
frequency energy and, if not installed and used in accordance with the instructions, may cause harmful
interference to radio communications.
However, there is no guarantee that interference will not occur in a particular installation. If this
equipment does cause harmful interference to radio or television reception, which can be determined
by turning the equipment off and on, the user is encouraged to try to correct the interference by one or
more of the following measures:
Reorient or relocate the receiving antenna.
Increase the separation between the equipment and receiver.
Connect the equipment into an outlet on a circuit different from that to which the receiver is
connected.
Consult the dealer or an experienced radio/TV technician for help.
WARNING: Only peripherals complying with the FCC class B limits may be attached to this
equipment.
Changes or modifications made to this equipment, not expressly approved by us or parties authorized
by us could void the user’s authority to operate the equipment. This device complies with part 15 of
the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause
harmful interference, and (2) this device must accept any interference received, including interference
that may cause undesired operation.
SAFETY INSTRUCTIONS
There are two categories of Safety Instructions included in this manual:
Product Warnings, (i.e., what must never be done to assure avoiding those hazards that could
cause bodily injury or property damage); and
User Directions (i.e., what must always be done to assure the safe use of your device).
The Safety Instructions contained in this manual have been categorized in accordance with the
seriousness of the potential hazards through the use of Signal Words. Those Signal Words, and their
intended meanings, are as follows:
DANGER: Indicates that a failure to observe the Safety Instructions could result in death or
catastrophic bodily injury.
WARNING: Indicates that a failure to observe the Safety Instructions could result in serious bodily
injury.
CAUTION: Indicates that a failure to observe the Safety Instructions could result in minor bodily
injury or property damage.
NOTE: Designates important information that relates to activities and/or conditions that might result
in loss of data and/or damage to your device.
Safe Use and Operation of Your Device
This equipment emits stray RF energy and will interfere with the reception of signals by airborne
electronic navigational devices or medical devices. Do not operate this equipment near any sensitive
medical devices.
WARNING: Use only grounded AC power cords.
Always immediately disconnect the power to the equipment in the event the device emits an unusual
odor or sound or generates smoke.

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382 South Abbott Avenue, Milpitas, CA 95035, USA • PHONE: [phone] •FAX: [phone]
nuforce.com •EMAIL: [email protected] •Skype: nuforce-sales
WARNING: Never attempt to disassemble, repair or make any modification to your device.
Disassembly, modification or any attempt at repair could cause bodily injury or property damage, as
well as damage to the device itself.
WARNING: Your device is not a toy. Never allow children to play with your device. Misuse, rough
or improper handling of your device by children could result in serious bodily injury for any of the
enumerated safety warnings in this manual. In addition, always keep all accessories and components
out of the reach of small children as small parts might present a choking hazard. Seek immediate
medical attention if choking occurs or if any small part has been swallowed.
CAUTION: Never raise the sound volume level too high when using your device with earphones. An
excessive sound volume level could cause damage to your hearing.
WARNING: To reduce the risk of fire or electric shock, do not expose the unit to moisture or water.
Do not allow foreign objects to get into the enclosure. If the unit is exposed to moisture, or a foreign
object gets into the enclosure, immediately disconnect the power cord from the wall. Take the unit to a
qualified service person for inspection and necessary repairs.
Read all the instructions before connecting or operating the component.
Keep this manual so you can refer to these safety instructions.
Heed all warnings and safety information in these instructions and on the product itself. Follow all
operating instructions.
Do not use this unit near water.
You must allow a minimum 10 cm or 4 inches of unobstructed clearance around the unit. Do not place
the unit on a bed, sofa, rug, or similar surface that could block the ventilation openings. If the unit is
placed in a bookcase or cabinet, there must be ventilation of the cabinet to allow proper cooling. Keep
the component away from radiators, heat registers, stoves, or any other appliance that produces heat.
The unit must be connected to a power supply only of the type and voltage specified on the rear panel.
Connect the component to the power outlet only with the supplied power supply cable or an exact
equivalent. Do not modify the supplied cable.
Do not route the power cord where it will be crushed, pinched, bent, exposed to heat, or damaged in
any way. Pay particular attention to the power cord at the plug and where the cord exits the back of the
unit.
The power cord should be unplugged from the wall outlet during a lightning storm or if the unit is to
be left unused for a long period of time.
Immediately stop using the component and have it inspected and/or serviced by a qualified service
agency if:
The power supply cord or plug has been damaged.
Objects have fallen or liquid has been spilled into the unit.
The unit has been exposed to rain.
The unit shows signs of improper operation.
The unit has been dropped or damaged in any way.

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382 South Abbott Avenue, Milpitas, CA 95035, USA • PHONE: [phone] •FAX: [phone]
nuforce.com •EMAIL: [email protected] •Skype: nuforce-sales
The NuForce DAC-9 Digital Analog Converter
Engineered to meet the needs of the most demanding audio purists while also
providing the greatest degree of flexibility, the NuForce DAC-9 is a true reference-
class digital-to-analog stereo converter, pre-amplifier and headphone amplifier in one
supremely sophisticated package. As to versatility, with its six digital inputs, the
DAC-9 offers compatibility with all existing digital formats.
And, in keeping with NuForce’s commitment to its customers, plug-in USB
module/interfaces will always provide for upgradeability to higher bit rates, thereby
securing the end-user’s investment as digital technology continues to advance.
The DAC-9 addresses the need for complexity on a foundation of remarkable
simplicity. Minimal processing and the shortest possible signal paths set the DAC-9
apart. For example, when an input source is selected, a pair of high-performance, non-
over-sampling DACs offer up to 24-bit/192kHz (24bit/96kHz for USB) conversion of
digital audio data. Extensive testing and listening tell us that up-sampling and sample-
rate conversion do more harm than good, as does negative feedback. Consequently,
no form of sample-rate conversion is ever employed.
Summing the output of two DACs increases the signal-to-noise ratio to near-
theoretical limits wherein every musical nuance stands out in brilliant contrast to a
background of utter silence. As a further enhancement, an innovative Passive IV
Digital Output Filter assures lifelike musical reproduction. The DAC-9’s passive
circuit employs no negative feedback of any kind, thus providing a ripple-free
response wherein high-frequency phase coherence is always maintained.
Beyond the DACs and digital filter, the converted signal passes on to the analog
preamplifier stage, which also adheres minimalist design principles. Again, NuForce
applies no negative feedback in order, among other good reasons, to avoid higher-
order distortion artifacts that typically plague unnecessarily complicated designs. The
quietest circuitry components and layouts, along with the shortest possible signal
paths, likewise contribute to the DAC-9’s exemplary performance characteristics. As
another means to a “straight-wire-with-gain” end, when the user selects Fixed-Mode
Output, the digitally controlled, precision volume attenuator is bypassed by means of
a precision mechanical relay.
As impressive as these refinements are, the DAC-9 would not be nearly so successful
without the clean, stable energy a shunt-regulated linear power supply provides. With
its multiple regulation stages, the power supply allows the DAC-9’s digital and
analog circuits to operate to their fullest potential, with the lowest noise and distortion
possible.
Nor has NuForce overlooked the needs of the dedicated headphone listener. The
DAC-9 includes a fully independent, high-performance headphone stage with a
dedicated volume control. The DAC-9’s 6.3mm and 3.5mm headphone jacks sidestep
the inconvenience and potential distortion of external plug adaptors. The DAC-9’s
exceptional value and versatility is exemplified by the unit’s remote control, which

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382 South Abbott Avenue, Milpitas, CA 95035, USA • PHONE: [phone] •FAX: [phone]
nuforce.com •EMAIL: [email protected] •Skype: nuforce-sales
beyond its array of usual conveniences, operates other NuForce devices such as our P-
9 Preamp and CDP-8 CD Player. Moreover, the DAC-9’s sleek touch panel and low-
profile chassis make a visually attractive addition to the finest playback systems.
NuForce strives, as always, to achieve superior performance by means of the purest
and therefore simplest of design concepts. We’re confident that you will find the
NuForce DAC-9 Digital-to-Analog Converter, Preamp and Headphone Amp to be the
ideal answer to your listening requirements. Price notwithstanding, few competing
products can compare to the DAC-9’s sonic excellence, simple elegance, and of
course convenience. When one then takes into account the exceptional value the
DAC-9 represents, we’re sure you'll agree it’s in a class of its own.
Back-Panel Connections
The DAC-9 employs a linear power supply. To avoid accidental damage, make sure
the DAC-9’s voltage switch is set to your area’s AC voltage.
Digital Inputs 1 to 6:
1. USB, including a small plugged-in module that allows for future
upgradeability to a higher-bit-rate USB interface card.
2. XLR, AES/EBU digital connection.
3. Coaxial or BNC S/PDIF input. Only one of these inputs can be used when
Input 3 is selected. To achieve optimum performance, we recommend a 75-
ohm BNC cable (available from NuForce) with a BNC connector.
4. RCA, another S/PDIF input.
5. TOSLINK, an optical S/PDIF input.
6. On the front panel, a 3.5mm optical S/PDIF input. (The 3.5mm input is
commonly used by Mac and PC sound cards.) A 3.5mm analog phone jack
shares this connector.
Analog Outputs
The DAC-9 provides RCA and XLR analog outputs. The true-balanced XLR output
produces twice the gain of the RCA output. The remote and front panel controls allow
for fixed and variable voltages.
Front Panel Control

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382 South Abbott Avenue, Milpitas, CA 95035, USA • PHONE: [phone] •FAX: [phone]
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Pressing 1 to 6 selects the corresponding digital inputs. The Up arrow is a volume-up
key; the Down arrow is a volume-down key.
Note: The Volume keys are not capable of acceleration. Each press of the key
increases or decreases the volume by one step. To achieve accelerated volume, use the
remote control.
Front Panel Displays
From the left, the first digit indicates the selected Digital Input. The Volume Level
follows. (When the unit is powered on, the default position is 40.) The right-side
display shows the detected sampling rate: 44, 88, 176, and 192. If the sampling rate
does not correspond to a standard frequency, or if the signal is in error, the display
produces a dash (––).
Headphone Output
The DAC-9 includes a high-performance headphone amplifier with an independent
volume control operated via the front-panel knob. (We recommend against using the
provided 6.3mm and 3.5mm phone jacks simultaneously unless the two headphones
in operation are identical models with the same impedance.)
The 3.5mm Phone Jack doubles as an optical input (typical of the S/PDIF optical
output MAC and PC peripherals employ).

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382 South Abbott Avenue, Milpitas, CA 95035, USA • PHONE: [phone] •FAX: [phone]
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Remote Control
The supplied remote also controls the NuForce P8S, P9, IA7, and CDP-8. The
following keys apply to the DAC-9:
Volume Up/Down – Via the remote, the DAC-9’s volume default (at 50) can be
elevated to 99. To accelerate the volume level, depress the Up or Down key until you
achieve the desired volume.
M– Mute. The Mute key mutes the DAC-9’s output. The front volume indicator will
consist of a blinking dash (––).
S– Select Input. Pressing the S key shifts operation to the next input.

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382 South Abbott Avenue, Milpitas, CA 95035, USA • PHONE: [phone] •FAX: [phone]
nuforce.com •EMAIL: [email protected] •Skype: nuforce-sales
D– Dim. Dim shuts off the front panel LED and digital display. During dimmed
operation the remote and front-panel operate as usual. The display will light up briefly
when any button is pressed.
Selecting Fixed Analog Output level
With its digitally controlled Analog Volume Control, the DAC-9 operates as a preamp.
Where the DAC-9 is used with a separate preamp, the DAC-9’s analog output can be
locked to fixed outputs. When enabling the Fixed function, a relay will bypass Analog
Volume.
To enable Fixed Output, using either the front panel control or remote control, raise
the volume level to 99. Using only the front-panel Volume-Up key, raise the volume
level to the 1 step. The display will go blank, thus indicating that Fixed Output has
been achieved.
Note: The remote control’s Volume Up/Down keys are disabled when the DAC-9 is
set to Fixed Output.
To disable Fixed Output, use the front panel’s Volume-Down key. The display will
show 99, indicating that the fixed output has been disabled.
Specifications:
Digital Inputs:
6 selectable digital inputs, transformer or optical isolated, AC coupled.
Maximum bit depth: 24 bit
Maximum sample rate: 192kHz; USB spec (96k option): 44.1kHz, 48kHz, 96kHz
Analog Outputs
Output Impedance: RCA, 0.01 Ohm; XLR , 50 Ohm; Headphone 10 Ohm
Output voltage 0dB 1kHz: RCA 2.0/4.0Vrms, XLR 4.0/8.0Vrms (Low output/High
output versions)
Headphone power spec:
288mW rms @ 30 Ohm
210mW rms @ 120 Ohm
152mW rms @ 300 Ohm
THD+N: 0.01, 0dB, 1kHz
Signal to Noise ratio: 103dB, 1kHz, A-weighted
Frequency Response: 20-20kHz +/- 0.25dB
Power consumption: 9W
AC voltage: 100V/110V/220V/230V depending on countries
Dimension: 215mm (w) x 400mm (d) x 60mm (h)
Weight: 3.2Kg net, 4.5Kg shipped

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382 South Abbott Avenue, Milpitas, CA 95035, USA • PHONE: [phone] •FAX: [phone]
nuforce.com •EMAIL: [email protected] •Skype: nuforce-sales
NuForce’s Limited Warranty and Limitation of Liabilities
ADDITIONALRIGHTS
FORCONSUMERS,WHOARECOVEREDBYCONSUMERPROTECTIONLAWSORREGULATIONSINTHEIRCOUNTRYOFPURCHASEOR,IFDIFFERENT,
THEIRCOUNTRYOFRESIDENCE,THEBENEFITSCONFERREDBYTHISWARRANTYAREINADDITIONTOALLRIGHTSANDREMEDIESCONVEYEDBY
SUCHCONSUMERPROTECTIONLAWSANDREGULATIONS.THISWARRANTYDOESNOTEXCLUDE,LIMITORSUSPENDANYRIGHTSOF
CONSUMERSARISINGOUTOFNONCONFORMITYWITHASALESCONTRACT.SOMECOUNTRIES,STATESANDPROVINCESDONOTALLOWTHE
EXCLUSIONORLIMITATIONOFINCIDENTALORCONSEQUENTIALDAMAGESORALLOWLIMITATIONSONHOWLONGANIMPLIEDWARRANTYOR
CONDITIONMAYLAST,SOTHELIMITATIONSOREXCLUSIONSDESCRIBEDBELOWMAYNOTAPPLYTOYOU.THISWARRANTYGIVESYOUSPECIFIC
LEGALRIGHTS,ANDYOUMAYALSOHAVEOTHERRIGHTSTHATVARYBYCOUNTRY,STATEORPROVINCE.THISLIMITEDWARRANTYISGOVERNED
BYANDCONSTRUEDUNDERTHELAWSOFTHECOUNTRYINWHICHTHEPRODUCTPURCHASETOOKPLACE.
LIMITEDWARRANTY
ForaperiodofTHREE(3)YEARfromthedateofretailpurchasebytheoriginalend‐userpurchaser(“WarrantyPeriod”),NuForcewarrants(i)this
productagainstdefectsinmaterialsandworkmanship,and(ii)thateachProduct,unmodifiedandundernormaluseandconditions,will
substantiallycomplywithNuForce’applicablewrittentechnicaldocumentationfortheProduct.NuForcereservestherighttomakesubstitutions
andmodificationsfromtimetotimeinthespecificationsofProductssoldbyNuForce,providedthatsuchsubstitutionsormodificationsdonot
materiallyaffectoverallProductperformance.

IfahardwaredefectexistsandavalidclaimisreceivedwithintheWarrantyPeriod,atitsoptionandtotheextentpermittedbylaw,Nuforcewill
(1)repairthehardwaredefectatnocharge,usingneworrefurbishedreplacementparts,(2)exchangetheproductwithaproductthatisnewor
whichhasbeenmanufacturedfromneworserviceableusedpartsandisatleastfunctionallyequivalenttotheoriginalproduct,or(3)refundthe
purchasepriceoftheproduct.Nuforcemayrequestthatyoureplacedefectivepartswithuser‐installableneworrefurbishedpartsthatNuforce
providesinfulfillmentofitswarrantyobligation.Areplacementproduct/partassumestheremainingwarrantyoftheoriginalproductorninety
(90)daysfromthedateofreplacementorrepair,whicheverprovideslongercoverageforyou.Whenaproductorpartisexchanged,any
replacementitembecomesyourpropertyandthereplaceditembecomesNuforce'sproperty.Whenarefundisgiven,yourproductbecomes
Nuforce'sproperty.

OBTAININGWARRANTYSERVICE

IfyoupurchasedtheproductintheU.S.,delivertheproduct,atyourexpense,toanyNuforceServiceCenterlocatedintheU.S.Ifyoupurchased
theproductoutsideoftheU.S.,delivertheproducttoanyNuforceAuthorizedImporterinthecountrywhereyoupurchasedtheproduct.Be
aware,however,thatnotallcountrieshaveNuforceAuthorizedServiceProviders(‘NASP’)andnotallAuthorizedServiceProvidersoutsidethe
countryofpurchasehaveallpartsorreplacementunitsfortheproduct.Iftheproductcannotberepairedorreplacedinthecountryitisin,itmay
needtobesenttoadifferentcountryorreturnedtothecountryofpurchaseatyourexpenseforrepairorreplacement.Ifyouseekserviceina
countrythatisnotthecountryoforiginalpurchase,youwillcomplywithallapplicableimportandexportlawsandregulationsandberesponsible
forallcustomduties,V.A.T.andotherassociatedtaxesandcharges.Whereinternationalserviceisavailable,Nuforcemayrepairorexchange
defectiveproductsandpartswithcomparableproductsandpartsthatcomplywithlocalstandards.
YoucanalwaysdelivertheproducttoNuForce’sU.S.mainservicecenterforobtainingwarrantyservice,however,youmayhavetopayforreturn
shippingcost.

Nuforcemaysendyouuser‐installableneworrefurbishedreplacementproductorpartstoenableyoutoserviceorexchangeyourownproduct
(“DIYService”).Uponreceiptofthereplacementproductorpart,theoriginalproductorpartbecomesthepropertyofNuforceandyouagreeto
followinstructions,including,ifrequired,arrangingthereturnoforiginalproductorparttoNuforceinatimelymanner.
WhenprovidingDIYServicerequiringthereturnoftheoriginalproductorpart,Nuforcemayrequireacreditcardauthorizationassecurityforthe
retailpriceofthereplacementproductorpartandapplicableshippingcosts.Ifyoufollowinstructions,Nuforcewillcancelthecreditcard
authorization,soyouwillnotbechargedfortheproductorpartandshippingcosts.Ifyoufailtoreturnthereplacedproductorpartasinstructed
orthereplacedproductorpartisnoteligibleforwarrantyservice,Nuforcewillchargethecreditcardfortheauthorizedamount.

EXCLUSIONSANDLIMITATIONS

ThisLimitedWarrantyappliesonlytohardwareproductsmanufacturedbyorforNuforcethatcanbeidentifiedbythe"Nuforce"trademark,
tradename,orlogoaffixedtothem.TheLimitedWarrantydoesnotapplytoanynon‐Nuforcehardwareproductsoranyaccessories,evenif
packagedorsoldwithNuforcehardware.Non‐Nuforcemanufacturers,suppliers,mayprovidetheirownwarranties.Otheraccessoriesdistributed
byNuforceundertheNuforcebrandnamearenotcoveredunderthisLimitedWarranty.Thiswarrantydoesnotapply:(a)todamagecausedby
accident,abuse,misuse,misapplication,liquidcontact,fire,earthquake,non‐Nuforceproducts,orotherexternalcauses;(b)todamagecausedby
serviceperformedbyanyonewhoisnotaNASP;(c)toaproductorapartthathasbeenmodifiedwithoutthewrittenpermissionofNuforce;(d)
toconsumableparts,suchasbatteries,orprotectivecoatingsdesignedtodiminishovertimeunlessfailurehasoccurredduetoadefectin
materialsorworkmanship;(e)tocosmeticdamage,includingbutnotlimitedtoscratches,dents,andbrokenplasticonports;(f)todefectscaused
bynormalwearandtearorotherwiseduetothenormalagingoftheproduct;or(g)ifanyNuforceserialnumberhasbeenremovedordefaced.

Important:Donotopenthehardwareproduct.Openingthehardwareproductmaycausedamagethatisnotcoveredbythiswarranty.Only
NuforceoraNASPshouldperformserviceonthishardwareproduct.

THISWARRANTYANDREMEDIESSETFORTHABOVEAREEXCLUSIVEANDINLIEUOFALLOTHERWARRANTIES,REMEDIESANDCONDITIONS,
WHETHERORALORWRITTEN,EXPRESSORIMPLIED.NUFORCESPECIFICALLYDISCLAIMSANYANDALLIMPLIEDWARRANTIES,INCLUDING,
WITHOUTLIMITATION,WARRANTIESOFMERCHANTABILITYANDFITNESSFORAPARTICULARPURPOSE.IFNUFORCECANNOTLAWFULLY
DISCLAIMIMPLIEDWARRANTIESUNDERTHISLIMITEDWARRANTY,ALLSUCHWARRANTIES,INCLUDINGWARRANTIESOFMERCHANTABILITY
ANDFITNESSFORAPARTICULARPURPOSEARELIMITEDINDURATIONTOTHEDURATIONOFTHISWARRANTY.NoNuforcereseller,agent,or
employeeisauthorizedtomakeanymodification,extension,oradditiontothiswarranty.
NUFORCEISNOTRESPONSIBLEFORDIRECT,SPECIAL,INCIDENTALORCONSEQUENTIALDAMAGESRESULTINGFROMANYBREACHOFWARRANTY
ORCONDITION,ORUNDERANYOTHERLEGALTHEORY,INCLUDINGBUTNOTLIMITEDTOLOSTPROFITS,DOWNTIME,GOODWILL,DAMAGETO
ORREPLACEMENTOFEQUIPMENTANDPROPERTY,ANYCOSTSOFRECOVERING,REPROGRAMMING,ORREPRODUCINGANYPROGRAMORDATA
STOREDINORUSEDWITHNUFORCEPRODUCTS,ANDANYFAILURETOMAINTAINTHECONFIDENTIALITYOFDATASTOREDONTHEPRODUCT.
NUFORCESPECIFICALLYDOESNOTREPRESENTTHATITWILLBEABLETOREPAIRANYPRODUCTUNDERTHISWARRANTYORMAKEAPRODUCT
EXCHANGEWITHOUTRISKTOORLOSSOFPROGRAMSORDATA.


9
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382 South Abbott Avenue, Milpitas, CA 95035, USA • PHONE: [phone] •FAX: [phone]
nuforce.com •EMAIL: [email protected] •Skype: nuforce-sales
Somestatesandprovincesdonotallowtheexclusionorlimitationofincidentalorconsequentialdamagesorexclusionsorlimitationsonthe
durationofimpliedwarrantiesorconditions,sotheabovelimitationsorexclusionsmaynotapplytoyou.Thiswarrantygivesyouspecificlegal
rights,andyoumayalsohaveotherrightsthatvarybystateorprovince.

ProofofpurchaseintheformofabillofsaleorreceiptedinvoicewhichisevidencethattheunitiswithintheWarrantyperiodmustbepresented
toobtainwarrantyservice.

REPLACEMENTASPROVIDEDUNDERTHISWARRANTYISTHEEXCLUSIVEREMEDYOFTHECONSUMER.
NUFORCESHALLNOTBELIABLEFORANYINCIDENTALORCONSEQUENTIALDAMAGESFORBREACHOFANYEXPRESSORIMPLIEDWARRANTYON
THISPRODUCT.EXCEPTTOTHEEXTENTPROHIBITEDBYAPPLICABLELAW,ANYIMPLIEDWARRANTYOFMERCHANTABILITYORFITNESSFORA
PARTICULARPURPOSEONTHISPRODUCTISLIMITEDINDURATIONTOTHEDURATIONOFTHISWARRANTY.