Hafler trans-nova 9505 User manual

®
MADE
USA
IN THE
PROFESSIONAL POWER AMPLIFIER
9505
Installation & Operation
PROFESSIONAL POWER AMPL
nova
trans
®

NOTICE - IMPORTANT SAFETY INFORMATION
1. READ INSTRUCTIONS
AllthesafetyandoperatinginstructionsofyourHaflerequipment
should be read before power is applied to the equipment.
2. RETAIN OWNER'S MANUAL
These safety and operating instructions should be retained for
future reference.
3. HEED WARNINGS
All warnings on the equipment and in the operating instructions
are important and should be followed.
4. FOLLOW INSTRUCTIONS
All operating and use instructions are important and should be
followed.
5. HEAT
Theequipmentshouldbekeptawayfromareasofhightempera-
ture, i.e., heater vents, radiators, stoves/ovens, fireplaces, etc.
6. VENTILATION
The equipment should be used in an area suitable for proper
ventilation. Care should be taken not to impede airflow in and
around the cabinet.
7. WATER AND MOISTURE
The equipment should not be used in or around water, such as a
bathtub,sink,orswimmingarea. Also,theequipmentshouldnot
be used in areas prone to flooding, such as a basement.
8. POWER SOURCES
The equipment should be connected only to a power source of
the same voltage and frequency as that listed on the rear panel
above the power cord entry point.
9. POWER CORD PROTECTION
Powercordsshouldbearrangedsotheydo not interfere with the
movementofobjectsintheroom:people,fanblades,utilitycarts,
etc. Also,careshouldbetakenthatthecordisnotpinchedorcut,
and placed so it is not in danger of being pinched or cut, as in
under a rug, around a tight corner, etc.
10. POWER CORD GROUNDING
Thepowersupplycordisofathreewiregroundedtype,designed
to reduce the risk of electric shock sustained from a live cabinet.
It is assumed to be of suitable length for most uses of the
equipment. The use of extension cords and power strips is
discouraged unless they are of suitable rating to deliver the
required total current for safe operation of all connected equip-
ment. Furthermore,extensioncordsorpowerstripsmustprovide
thesamethreewiregroundedconnection. Itisimportantthatthe
blades of the equipment’s plug be able to fully insert into the
mating receptacle. Never remove the round grounding pin on
the plug in an attempt to mate to a two wire ungrounded
receptacle: use a grounding adaptor with the grounding tab or
wire suitably connected to earth ground.
11. NON-USE PERIODS
During periods of extended non-use, the power cord should be
unplugged from the power source.
12. CLEANING
Theequipmentshouldbe cleaned only asdetailedinthe operat-
ing instructions.
13. OBJECT AND LIQUID ENTRY
Care should be taken so that objects and/or liquids, such as
cleaningfluidsorbeverages, are not spilledintotheenclosure of
the equipment.
14. DAMAGE REQUIRING SERVICE
Haflerequipmentshouldbeservicedbyqualifiedserviceperson-
nel when:
A. The power supply cord or plug has been damaged, or
B. Objects have fallen onto, or liquid has been spilled into the
equipment, or
C. The equipment has been exposed to rain, or
D. The equipment does not appear to operate normally or
exhibits a marked change in performance, or
E. The equipment has been dropped, or the enclosure has
been damaged.
15. SERVICING
Theusershouldnotattempttoservicetheequipmentbeyondthat
whichisdescribedintheoperatinginstructions. Allotherservice
should be referred to qualified service personnel.
16. CARTS AND STANDS
The equipment should be used with carts or stands only of
sufficient strength and stability for the use intended.
Anequipmentandcartcombinationshouldbemovedwithcare.
Quickstopsandstarts,excessiveforce,andunevensurfacesmay
cause the equipment and cart combination to topple.
– i –
The lightning flash with arrowhead symbol within an equilateral
triangle is intended to alert the user to the presence of uninsulated
"dangerous voltage" within the product's enclosure, that may be of
sufficient magnitude to constitute a risk of electric shock to persons.
Theexclamationpointwithinanequilateraltriangleisintendedtoalert
the user of the presence of important operating and maintenance
(servicing) instructions in the literature accompanying the appliance.
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
WARNING: TO PREVENT FIRE OR SHOCK HAZARD
DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE.
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PERFORMANCE SPECIFICATIONS
– ii –
9505
Power Rating: FTC (20Hz-20kHz, <0.2% THD)
250 wpc into 8Ω
375 wpc into 4Ω
750 w into 8Ω(bridged mono)
Distortion: <0.1% THD, typically 0.005% THD 1kHz at rated power into 8Ω
Signal-to-Noise Ratio: 100dB below rated output from 20Hz-20kHz “A” Weighted
Frequency Response: 20Hz-20kHz, ±0.1dB
Bandwidth: 0.15Hz-300kHz, +0/–3dB
Slew Rate: 150 V/µs
CMRR: >75dB at 1kHz
Input Impedance: 47,000Ωper phase balanced
Input Sensitivity Range: 800mV (@ 8Ω) per phase balanced
690mV (@ 4Ω) per phase balanced
In/Out Gain: +29dB maximum
Damping Factor: 1000 (to 1kHz); 100 (to 10kHz); 20 (to 100kHz)
Power Consumption: 160W / 2A @ 120VAC (Idle Power)
(Both Channels Driven) 370W / 4.2A @ 120 VAC (1/8 Power – 8Ω)
840W / 8.8A @ 120 VAC (Max. Power – 8Ω)
Controls & Switches: Front Panel Power Switch
Indicators: Line Power LED
Connectors: XLR & 1/4" combo input
Gold-plated RCA input
5-way Binding Post output
IEC Standard Line input
Dimensions: 19"W x 12-1/2"D* x 5-1⁄4"H (3-rack spaces)
(48.26cm x 31.75cm x 13.34cm)
*plus 1" (2.54cm) for handles
Net Weight: 50 lbs. (22.68kg)
19.00
1.19
12.05
16.94
5.20
®
Series 9505
Power amplifier
True-balanced JFET input

TABLE OF CONTENTS
SAFETY PRECAUTIONS........................................................................................................................................... i
PERFORMANCE SPECIFICATIONS......................................................................................................................... ii
INTRODUCTION ................................................................................................................................................... 1
INSTALLATION
Front/Rear Panel View ...................................................................................................................................... 2
Location ........................................................................................................................................................... 3
AC Line ............................................................................................................................................................ 3
Input................................................................................................................................................................. 4
Balanced Input: 1/4" Tip Ring Sleeve.......................................................................................................... 4
Balanced Input: XLR................................................................................................................................... 4
Unbalanced Input ...................................................................................................................................... 4
Unbalanced Source with Balanced Input ................................................................................................... 4
Output Connections ......................................................................................................................................... 4
Monophonic Use.............................................................................................................................................. 4
OPERATION
Power Switch ................................................................................................................................................... 5
Input Switch ..................................................................................................................................................... 6
Ground Switch ................................................................................................................................................. 6
Mono Switch .................................................................................................................................................... 6
Load Fault Protection........................................................................................................................................ 6
Warm Up ......................................................................................................................................................... 6
Cleaning and Maintenance............................................................................................................................... 6
PC Board Layout............................................................................................................................................... 7
Schematic Diagram .......................................................................................................................................... 8
Parts List ......................................................................................................................................................... 10
9505 Functional Block Diagram ..................................................................................................................... 12
TECHNICAL INFORMATION
Theory and Operation of trans• nova .............................................................................................................. 13
Circuit Implementation................................................................................................................................... 13
Calibration ..................................................................................................................................................... 14
Common Mode Rejection ........................................................................................................................ 14
Bias.......................................................................................................................................................... 14
WARRANTY ......................................................................................................................................................... 15

INTRODUCTION
– 1 –
The Hafler 9505 is a two channel professional power amplifier using passive cooling with a large heatsink for
lowmechanicalnoise.Ourpatentedtrans•novacircuittopologyandMOSFEToutputstageensurestrouble-free,longtermoperation
andisbackedbyoursevenyearwarranty.
Thismanualcontainsinformationonusingthe9505amplifierandisorganizedintothreemainsections.“Installation”coversthe
locationandconnectionoftheamplifierinthesystem.Likemanyprecisioncomponents,carefulattentiontotheinitialsetupcan
yielddividendsinhigherperformanceandtrouble-freeuse.“Operation”coversthecontrolsandfeaturesoftheamplifierandhow
tousethemtogetthebesteffect.The“TechnicalReference”sectioncontainsinformationonthecircuitimplementationandthe
schematicdiagramandpartslist.WestronglyurgereadingovertheInstallationandOperationportionsofthismanualbeforeputting
theamplifierintoservice.
The circuitry used in the 9505 is the latest refinement of our trans•nova (TRANSconductance NOdal Voltage
Amplifier,USPatent4,467,288)circuit.The9505utilizesourproprietaryDIAMOND(patentpending)transconductancedriver
stagewhichcombinesthelinearityofClassAoperationwiththecurrentheadroomofaClassBsystem.Whenusedincombination
withtherobustoutputstagefeaturedinthismodel,DIAMONDyieldslowerhighfrequencydistortionwithoutthesonicpenalties
associatedwithincreasingthenegativefeedback.
The9505hasfullydifferentialinputsforuseinbalancedlinesystems.Thebalancedinputterminalsworkwith
either1/4"TRSphoneorXLRplugs.Gold-platedRCAphonojacksareavailableforusewithunbalancedsource
components. The output terminals are gold-plated binding posts, spaced on 3/4" centers for use with dual
banana plugs. For high power applications, the amplifier can run in bridged mono for double the output
voltage.

– 2 –
®
Series 9505
Power amplifier
True-balanced JFET input
Front Panel View
Rear Panel View
CHANNEL 2
MONO OUTPUT: Use CH 1 Input Only.
CHANNEL 1
CH 2
120 VAC 60Hz 1800W MAX
Audio GND
Chass. Float
Phone Connections
CHANNEL 1
Mono 2 Ch
Unbal.
Bal.
A Division of Rockford Corp. Tempe, AZ 85281 U.S.A. Made in the U.S.A.
CH 1
(Mono)
+–
CHANNEL 2
4-8ΩCHANNEL 1
4-8Ω
PUSH
PUSH
XLR Connections
3
21
+
–
Mono
–+
®
230 V~
50/60Hz
662W T8A 250V
MODEL 9505CE

– 3 –
LOCATION
The 9505 power transformer can generate a substantial magnetic field, so caution should be exercised in the
placement of low level components such as a tape deck, mixer or mic preamp to avoid inducing noise in the low
levelcircuitry.Theamplifierscanalsoproduceconsiderableheatinnormaloperationsotheprimaryconsideration
when determining a location for the amplifiers is to allow for adequate ventilation. The large heatsinks provide
unrestrictedairflow,butcaremustbetakentokeeptheslotsinthebottompanelandtopcoverclear.Iftheamplifier
is mounted in an equipment rack, make sure adjacent equipment does not impede cool air flow.
Rack systems should have two fans 4" to 5" in from the front of the amplifier blowing upward.
Lossistemasempotradosengabinetes(rack),debentenerdos(2)ventiladoressoplandohaciaarriba,ubicados
de 10 a 12.5 ctms. detrás del frente del amplificador.
LeschainesstéreoRackdevraientavoirdeuxventillateursplacésà4ou5centimètres,enfacedel'amplificateur.
Rack Systeme sollten zwei eingebaute Ventilatoren haben, die Luft von oben auf den Verstärker leiten. Die
Ventilatoren sollten ca. 10-20cm hinter der Front des Verstärkers angebracht werden.
Perisistemiadarmadiosononecessaridueventilatoridirezionatiinsucollocatidai10ai13centimetridavanti
all'amplificatore.
Inadequate ventilation can shorten component life, especially when other equipment raises the ambient air
temperature, so circulating fans should be considered in tight quarters.
INSTALLATION
Fan center approximately in line with edge of unit and starting of heatsink fins
• Fans placed 4" to 5" from front of unit
• Fans placed under the unit pointing upwards
• Recommended 9505 fan is 50cfm x 2
(Bottom View)
4" to 5"
(from fan center)
AC LINE
The 9505 amplifier operates from a 120 volt, 60Hz AC power line. Connection is made by a 16 gauge, IEC Type
320,groundedlinecord.Forsafetyconsiderationsonlyaproperlygrounded(earthed)receptacleshouldbe used.
If a grounded circuit is not available, do not break off the ground pin; use the proper adapter plug for a two wire
receptacle.Mountedontherearpanelisthelinefusewhichinterruptsthepowertotheamplifier.Ifthisfuseblows
replaceitonlywiththesametypeandratingfuse.Thecorrectreplacementfusevalue is printed on the rear panel
of the amplifier. If the new fuse blows, this is an indication of a fault with the amplifier. Servicing should be
performed only by a qualified technician.
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XLR Balanced Input
Check output of source unit for proper signal polarity 1/4" TRS Balanced Input Check output of source unit for proper signal polarity
Pin 1 = GND
Pin 2 = (+)
Pin 3 = (–)
INPUT FROM
SOURCE
Tip = (+)
Ring = (–)
Sleeve = GND
INPUT FROM
SOURCE
Many popular mixers use unbalanced outputs and can be used with the Balanced inputs. To minimize residual
ground noise, we recommend using twisted pair cable or short cable lengths in this type of configuration.
XLR Unbalanced Input
Connect (–) and GND (shield) terminals at both ends of cable to
prevent unstable amplifier operation
1/4" TRS Unbalanced Input
Pin 1 = GND
Pin 2 = (+)
Pin 3 = GND
INPUT FROM
SOURCE Tip = (+)
Sleeve = GND
INPUT FROM
SOURCE
1
23
GND
–
+
1
23
SHIELD
+
SHIELD
SHIELD
+
–
+
UNBALANCED INPUT
The unbalanced inputs use conventional RCA phone jacks. Set the BALANCED/UNBALANCED switch to the
UNBALANCED position to use these jacks.
BALANCED INPUT
The input jacks located on the back of the amplifier are dual function connectors which accept 1/4" Phone (Tip
Ring Sleeve) or XLR plugs. The 1/4" Phone jack is connected according to conventional usage. The XLR jack is
connected according to the IEC and AES standard.
OUTPUT CONNECTIONS
The speaker output connectors are dual binding posts. These binding posts will directly accept 12 AWG wire
or banana plugs and are spaced on 3/4" centers to accept dual banana plugs.
MONOPHONIC USE
For systems with high power requirements, the amplifiers can be configured for single channel bridged mono
operation. To bridge the amplifier, set the rear panel Mono/2 Ch switch to the Bridged Mono position. Only
the Channel 1 input and level control is used. The speaker is connected to the RED output binding posts.
– 4 –

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Whentheamplifier is bridged the output isfloating. Any speaker which requiresa common ground from
the amplifier output cannot be used in this application.
Cuando el amplificador esté en modo puente (bridge), la salida del mismo es flotante (sin neutro).
Cualquierparlantequenecesiteunatierracomúndelasalidadelamplificador,nopuedeserusadocuando
el modo puente esté activado.
Lorsque l'amplificateur est relié, la puissance de rendement est émise. Tout haut-parleur nécessitant
l'utilisation d'une même fiche que celle de l'amplificateur, ne peut pas être utilisé dans cette application.
Wenn der Verstärker gebrückt wird, ist der Ausgang schwimmend geerdet. Alle Lautsprecher, die
allgemeine Masse vom Verstärker nutzen, können in dieser Konfiguration nicht eingesetzt werden.
Nel caso di un'amplificatore ostruito, l'uscita é fluttuante non utilizzare in questa applicazione un
altoparlante che richiede la messa a terra in comune con l'uscita dell'amplificatore.
Sinceabridgedamplifiersharestheloadbetweenthetwochannels,eachchannelwilleffectivelydrivehalf
of the load. Therefore, for bridged mono operation we recommend using an eight ohm load as the
minimum impedance.
Ya que un amplificador en puente comparte la carga entre los dos canales, cada canal manejará
efectivamente la mitad de la carga. Por lo que, para la operación en modo puente (mono) recomendamos
el uso de una carga de ocho ohmios como la mínima impedancia.
Étant donné que l'amplificateur, une fois connecté, distribue la même charge entre les deux canaux,
chaque canal conduira, de façon efficace, la moitié de la charge. C'est pourquoi, pour les opérations
conduites en “mono”, nous recommandons l'utilisation d'une charge de huit ohm comme impédance
minimale.
Wird der Verstärker gebrückt, “sieht” dieser nur die halbe angelegte Last. Aus diesem Grund geben wir für
die gebrückte mono Operation eine minimale Last von 8 Ohm vor.
Visto che un'amplificatore ostruito divide il carico tra i due canali, ogni singolo canale in effetti conduce
meta del carico. Quindi, per il funzionamento monofonico ostruito dell'amplificatore si raccomanda
l'utilizzo di un carico di 8 ohm impedenza minima.
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POWER SWITCH
The POWER switch is located on the front panel of the amplifier. An internal lamp indicates when it is turned on.
Standard practice is to turn the amplifier on last and off first when switching components to prevent
sending damaging transients to the speakers.
Es costumbre encender el amplificador de último y apagarlo de primero cuando se estan encendiendo/
apagando otros equipos, para así evitar el envío de transientes dañinas a los parlantes.
Il est de pratique courante de commencer par tourner l'amplificateur sur “off” et de terminer par “on,”
lorsqu'il s'agit de prévenir l'envoie de passages nuisible aux haut-parleurs.
Der Verstärker sollte als letztes Gerät eingeschaltet und als erstes Gerät wieder ausgeschaltet werden, um
eine Beschädigung der Lautsprecher durch spannungsspitzen zu vermeiden.
L'uso comune consiglia l'accensione dell'amplificatore per ultimo e lo spegnimento per primo quando si
accendono i vari componenti, per evitare l'invio di transitori danneggianti agli altoparlanti.
It is possible to leave the power switch in the on position and switch the amplifier remotely through a power
distributionblockorpreampswitchedoutlet.Whendoingsomakesuretheswitchisratedforthecurrentrequired
by the amplifier.
OPERATION
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– 5 –

INPUT CONFIGURATION SWITCH
Mono / 2 Ch
Theamplifieroperatesintwo-channelmodewhentherearpanelMono/2Chswitchisinthe2Chposition.Tousetheamplifier
insinglechannel,bridgedmonoapplications,thefrontpanelswitchmustbeintheMonoposition.WheninMono,theChannel
1(+)and(–)inputsareconnectedtoChannel2inreversedpolarity,whichinvertstheChannel2output.OnlytheChannel1
inputisused,andthespeakerisconnectedtothetwopositive(+)outputterminals.
Forthermalconsiderationswedonotrecommendusinglessthananominaleightohmloadontheamplifierwhenrunningitin
bridgedmono.
Porconsideracionestérmicas,norecomendamoselusodeunacarganominalmenordeochoohmioscuandoelamplificador
estétrabajandoenelmodopuente.
Pourderaisonsthermales,nousnerecommandonspasd'envoyeràl'amplificateur,unechargedevaleurnominaleinférieure
àhuitohm,aumomentdufonctionementenmode“mono.”
UmthermischeStörungenzuvermeiden,empfehlenwirindermonoBrückenschaltungdieminimaleLastvon8Ohmnicht
zuunterschreiten.
Perragionidinaturatermalenonconsigliamol'usodiuncariconominaledell'amplifiactoreinferiorea8ohmnelcasodi
funzionamentomonofonicoostruito.
GROUNDSWITCH
Ground loops are characterized by a hum or buzz in the system and are caused by a voltage potential difference
between two points in a ground circuit. Ground loops are aggravated when multiple paths exist for a given circuit.
Mounting components in a rack with metal rails may introduce ground loops between associated equipment,
because the rails can establish an additional ground path.
TheCHASSIS/FLOATswitchallowsyoutoselecttheamplifiergroundingschemeforbestsystemcompatibility.With
the switch in the CHASSIS position all signal grounds are referred to the chassis and power line ground.
In the FLOAT position the signal ground is decoupled from the chassis. The position of the switch is determined by
the overall noise in the system; choose the position which gives the lowest hum.
LOAD FAULT PROTECTION
Because of the self-protecting properties and fault tolerance of the lateral MOSFETs used in the 9505, elaborate
voltage and current limiting protection schemes are not necessary. To prevent damage to the amplifier from a fault
inthe loudspeaker load, the power supply B+andB–railsarefused.Check these fuses if the soundisgarbledorthere
is no output. The fuses should not blow under normal use and a blown fuse is usually an indication of a fault. The
faultcouldbe a bad connection, a problemwith the speaker or ashort in the speakerline. Disconnect power to the
amplifier before removing the cover.
WARM UP
Inordertoachievethebestsonicperformancefromtheamplifier,werecommendlettingitwarmupfor1hourbefore
beginning any critical listening. The amplifier will not deliver its full potential sound quality before this time has
passed.
CLEANING AND MAINTENANCE
Thereis norequirementfor regular maintenanceonthe electroniccomponentsofthe amplifier.Ifthe case becomes
soileditcanbecleanedusingasoftclothandamilddetergent,suchasspraywindoworglasscleaner.Iftheamplifier
is located in a particularly dusty environment cleaning the inside with compressed air or vacuuming every 18 to 24
months is sufficient.
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– 6 –