Aguilar DB 751 User manual

Table of Contents
I. Safety Instructions page 2.
 II.Specications    page3.
III. Diagnostics & Protection page 4.
IV. Warranty Information page 6.
Page 1
The DB 751 Bass Head features a combination of raw
power and rich tone that continues the legacy of the
DB 750. The DB 751 is a groundbreaking hybrid with a
discreteMosfetoutputsectionanda3-tubepreamp.
While maintaining the legendary sound of the DB 750,
the DB 751 features improvements in the EQ section, a
better control layout, detachable rack ears, and
thermally controlled fans. This amp has the headroom
to bring your tone to life no matter what kind of music
you are playing. For sound clips and sample settings be
sure to visit our website at: www.aguilaramp.com.
English

WARNING: Toreducetheriskofreorelectricshock,donotexpose
 equipmenttorainormoisture.AguilarAmplicationassumesno
responsibility for any damage or injury that results from improper use or
service.
CAUTION: RISK OF ELECTRIC SHOCK! DO NOT OPEN! There are no user
serviceable parts inside of this product. This is a high voltage device,
and internal voltages can be lethal. Any and all work should be
 performedbyqualiedpersonnelonly.
In order to ensure safe operation of the device, please follow these guidelines:
1. Read the instruction manual in its entirety before trying to operate the
equipment. The manual should be kept for future reference.
2. Observe all safety precautions, warnings and instructions noted in this manual.
3.Alwaysunplugtheamplieroutofthewallsocket,beforecleaning.Useonlydry
cloth. Do not use aerosols or solvents.
4. Keep the device away from sources of water such as pools, bathtubs, and sinks,
anddonotexposeittorainorsplashesofwater.Donotplaceobjectslledwith
uidonthedevice.
5. Vents are provided for heat dissipation on the sides, and at the rear of the
amplier.Maintainatleasta2”(5cm)spacearoundtheseventstoprovide
sufcientventilation.
6.Keeptheamplierawayfromsourcesofheatandopename,suchasheaters,
radiators, stoves, lit candles, etc.
7. Make sure that the power cord is intact before plugging it into the unit. Do not
use cords with visible damage to its insulation, or connectors.
8.Thisdeviceisequippedwithasafetyfeaturethatrequirestheuseofthethree-
pin grounding power plug. Do not defeat the safety purpose of the grounding
plug.Ifprovidedplugdoesnottyouroutlet,consultanelectricianabout
replacing an obsolete power outlet.
9.Useonlyaccessorieslistedinthismanual,orinotherwayspeciedbythe
manufacturer.
10.Donotinstallthisamplieroncartsorothermovingobjects.
11.Whenamplierisinuse,routethepowercableinsuchwaythatwillpreventit
from being stepped on, tripped on, pinched or damaged in any other way.
12.Donotusethisdevicewithwall/ceilingmountsnotspeciedbythe
manufacturer.
13.TocompletelydiscontenttheequipmentfromtheACmains,disconnectthe
powercordfromtheACreceptacle.Foradditionalprotection,unplugthe
device during light storms, or when not used for long periods of time.
14.Nouserserviceablepartsinside.Referservicetoqualiedservicepersonnel.If
theunitwasexposedtoliquid,extensiveheatorre,orsustainedamechanical
damage of any kind, do not attempt to operate it. Disconnect the unit from the
walloutlet,andconsultqualiedservicepersonnel.
I. Safety Instructions
Page 2

Specications:
Power Output: 975 watts @ 2 ohms, 750 watts @ 4 ohms, 400 watts @ 8 ohms
Preamp Section: Three 12AX7s
Power Section: 12 complimentary lateral MOSFETs
Transformer:  CustomAguilartoroidalpowertransformer.
EQ Section:  passivetonestackwithactivemidrangeelement,bass:+12/-12
  @40Hz;midrange:+12/-12@750Hz;treb:+12/-7@4kHz
Deep Switch: Adds5dBofbroad-bandboostat30Hz
Bright Switch:  Adds5dBofbroadbandboostat5-7kHz
Effects Loop: Send is push/pull for line or instrument level; Return is push/pull for
parallel or series operation
Inputs:  One1/4”inputjackwithanactive/passiveswitch
Outputs: Two Neutrik Speakon speaker outputs, Jensen XLR balanced
  output(-32dB)withapre/postEQswitchandagroundliftswitch.
Tuner out.
Cooling: High quality whisper fans with thermal speed control
Dimensions:  17”Wx14”Dx5.25”H
Rack Size: Three Spaces, Includes detachable rack ears
Weight: 42 lbs
Warranty: Ten Year Limited
Optional:  Footswitch,TolexHeadcasesinDBseriescolors,Rackbag
Front Panel Features:
Input:
-6 dB Switch: Insertsa–6dBpadinthesignalpathtoallowexibilitywhen
adjusting the gain for a bass with very high output
Gain Knob: Controlsthegainofthepreampsection
Bright Switch: Adds5dBofbroadbandboostat5-7kHz
Treble Knob: +12/-7dB@4kHz.
Midrange Knob: +12/-12@750Hz
Bass Knob: +12/-12@40Hz
Deep Switch: Adds5dBofbroadbandboostat30Hz
Master Knob:  Controlsvolume
Clip Light: Flashesifthepreampisclipping.Turndowneitherthe“Gain”,
  theEQ,or“Master”volume.

FX Send: Sendsthesignaltoyoureffectsunits.Connecttheinputofyour
effects unit to this jack
FX Return: Returnsthesignalfromyoureffectsunitstotheamplier.
  Connecttheoutputofyoureffectsunittothisjack.
Effects Loop: The“Send”knobispush/pullforselectinglineorinstrumentlevel.
  Thisallowsyoutouseastudioeffectsunit(linelevel)orastomp
  box(requiresinstrumentlevel)intheFXloop.Adjusttheamount
  of“Send”soastogetmaximumperformancefromyoureffects
  unitandthe“Return”togettherightamountofeffectedsignal.
  The“Return”knobispush/pullforparallelorseriesoperation.
  Inparallelmode,theeffectedsignalismixedtothedrysound.In
series mode, the effects in the loop will process the entire signal.
The amount of effects can be adjusted with the return knob. If
you pull the return knob out for series operation without any
effects plugged in the loop, the loop will be open and no sound
will result.
XLR Balanced Output:
  UsethePre-EQsettinginaconcertsituationwherethesound
  engineeristakingasignalintothehouse-mixingconsole.The
engineer is now getting their feed before the preamp stage,
which allows them to use appropriate EQ for the venue. The EQ
on stage will still be controlled by your settings. If the engineer
  wantsyourEQsettingsincludedinthemix,setthecontroltoPost
EQ and your settings on stage will be sent to the house.
TheD.I.outputis–32dB.Thislevelisthecorrectoutputfora
  signalgoingintothepreamponamixer.Ourbalancedoutput
uses the highest quality Jensen output transformer. If you hear
any ground noise, change the position of the ground lift switch
under the output.
Footswitch:  UsetheoptionalAguilarfootswitchtomutethesignalforsilent
tuning.
Rear Panel:
Speaker Outputs:
  TwoNeutrikSpeakonconnectorsareprovided.Use12gaugeor
larger speaker cable for proper connections.
Tuner out: This output sends the signal to your connected tuner. This output
will still be active when you mute the DB 751.
Page 4

Diagnostic and Protection
TheDB751isequippedwithaself-diagnosticandstatus/protectioncircuit.
Uponpower-up,theunit’sbluestatusLEDwillblinkforapproximately45
seconds.Duringthistimeseveralcircuitparametersareveried,oral-
lowed to become self calibrated.
1. The high B+ voltage to the preamp tubes is slowly ramped up, allowing
the tube heaters to warm up before full current is drawn by the valves.
2.DCoffsetattheamp’soutputismonitored.Onlyifnoneispresent
(normalcondition),willtheunitproceedwiththeself-checkprotocol.
3.TemperatureontheMOSFETheatsinkischecked,andagainonlyif
normal temperature is detected, will the status check continue.
4. If all the voltages, offsets, and temperature are in accordance with
factoryspecications,thentheamp’sinput,andoutputrelayswillbe
energized. This will then cause the operate LED to illuminate and the
status LED to stop blinking. The amp is now ready for normal operation.
5. The circuit continues monitoring the above parameters to protect both
the DB 751 and the speakers connected to the amp in the event of unit
orusererror.ThiswillbeindicatedbythestatusLED’sblinking.
6.IfthestatusLEDcontinuesblinking,orstartsblinkingduringamplieruse,
thisindicatesasystemfault.Theamplierrequiresservicinginorderfor
normal operation to resume.
Page 5

Page 6
Limited Warranty
AguilarAmplication’sDB751hybridbassampiswarrantedtotheoriginal
owner for a period of ten years from the date of purchase against defects
in materials and workmanship. * Tubes are covered by the warranty for a
period of 90 days. Abuse, negligence, and normal wear and tear are not
covered by the terms of this warranty.
The warranty period starts from the date of purchase from an authorized
Aguilar dealer. Please register your DB 751 for warranty by going to www.
aguilaramp.comandselecting“OnlineRegistration”fromtheSupport
menu. It is important to save your original sales receipt. You will be asked
tosendacopywithyouramplier.
Before sending your unit to Aguilar for repair, you must receive a return
authorizationnumberfromus.Contactusviaphone,fax,oremail
([email protected])withadescriptionoftheproblem.Wewill
then issue to you a return authorization number.
You are responsible for all shipping charges. You must ship the unit to us
freight prepaid. We will return the unit to you freight collect. For safe
shipment, the product should be shipped in its original packaging. If you
nolongerhavethis,wecanarrangetosellyoureplacement-packing
materials.
AguilarAmplicationLLCisnotresponsibleforshippingdamage,eitherto
orfromourservicecenter.Claimsmustbeledwiththecarrier.
The only company authorized to perform work under this warranty is
AguilarAmplicationLLCofNewYork,NY.
*IfyoupurchasedyourDB751outsidetheUSA,pleasecontactyourlocal
DealerorDistributorforyourcountry’sspecicwarrantyperiodandrepair
procedure.
Aguilar Amplication LLC
599 Broadway, 7th Fl.
NY, NY 10012

El DB 751 Bass Head ofrece una combinación de
elevada potencia y gran sonido que continúa el
legado del DB 750. El DB 751 es un híbrido
revolucionario con una sección de salida discreta
MOSFETyunpreamplicadorde3-válvulas.
Manteniendo el legendario sonido del DB 750, el DB
751 incorpora mejoras en la sección EQ, mejor
disposicióndeloscontroles,orejasderackextraíblesy
ventiladores con control térmico de velocidad. El
amplicadorestádiseñadoparadarvidaasus
sonidos, sea cual sea el tipo de música que toque.
Para escuchar sonidos y ver ejemplos de
conguración,asegúresedevisitarnuestrositioWeb
en: www.aguilaramp.com.
Contenido
 I.Instruccionesdeseguridad  pág.8.
 II.Especicaciones    pág.9.
 III.DiagnósticoyProtección  pág.11.
 IV.Informaciónsobrelagarantía pág.12.
Español
Page 7

I. Instrucciones de seguridad
ADVERTENCIA: Para reducir el riesgo de incendios o descargas eléctricas,
 noexpongaelequipoalalluviaolahumedad.AguilarAmplication
 noasumeningunaresponsabilidadporcualquierdañoolesiónque
resulte del uso o servicio inapropiado.
PRECAUCIÓN: ¡RIESGO DE DESCARGA ELÉCTRICA! ¡NO ABRIR! No hay pie
zas en el interior de este producto reparables por el usuario. Este es un
dispositivo de alta tensión y las tensiones internas pueden ser letales.
 Cualquiertrabajodebeserrealizadoexclusivamenteporpersonal 
 cualicado.
Conelndegarantizarunfuncionamientosegurodeldispositivo,porfavor,sigalas
siguientes instrucciones:
1. Lea el manual de instrucciones en su totalidad antes de intentar operar el
equipo. Guarde el manual para referencias futuras.
2. Observe todas las precauciones de seguridad, advertencias e instrucciones
indicadas en este manual.
3.Siempredesconecteelamplicadordelatomadelacorrienteantesde
limpiarlo.Utilicesolopañossecos.Noutiliceaerosolesnidisolventes.
4.Mantengaelaparatoalejadodefuentesdeaguatalescomopiscinas,bañeras
ylavabos,ynoloexpongaalalluviaosalpicadurasdeagua.Nocoloque
objetos llenos de líquido en el dispositivo.
5. Los respiraderos se proporcionan para la disipación de calor en los lados y en la
partetraseradelamplicador.Mantengaalmenosunespaciode5cm
alrededordeestasrejillasdeventilaciónparaproporcionarsuciente
ventilación.
6.Mantengaelamplicadoralejadodefuentesdecaloryllamasabiertas,tales
como calentadores, radiadores, estufas, velas, etc.
7. Asegúrese de que el cable de alimentación esté intacto antes de conectarlo a
launidad.Noutilicecablescondañosvisiblesenelaislamientooenlos
conectores.
8.Estedispositivoestáequipadoconunsistemadeseguridadquerequiereeluso
deenchufedetresclavijasconconexiónatierra.Noolvidelafunciónde
seguridad del enchufe con toma a tierra. Si el enchufe no encaja en el enchufe
de red, consulte a un electricista en cuanto a la sustitución del enchufe
adecuado.
9.Utilicesólolosaccesoriosqueguranenelpresentemanualoqueesténdeotra
formaespecicadosporelfabricante.
10.Noinstaleesteamplicadorencarrosuotrosobjetosenmovimiento.
11.Cuandoelamplicadorestáenfuncionamiento,asegúresedeenchufarel
cable de alimentación de tal manera que no esté pisado, pinzado, doblado u
obstruido de otra forma.
12.Noutiliceestedispositivoconsoportesdepared/techonoespecicadosporel
fabricante.
13.Paraapagarcompletamenteelequipodelaredeléctrica,desconecteel
cable de alimentación de la toma de corriente alterna. Para una protección
adicional, desconecte el dispositivo durante las tormentas o cuando no se
utiliza durante largos períodos de tiempo.
14.En el interior del dispositivo no hay piezas reparables por el usuario. En cuanto
alserviciodemantenimientocontactealpersonalcualicado.Silaunidadha
estadoexpuestaalíquidos,alcalorexcesivooincendio,osihaydaños
mecánicosdecualquiertipo,notratedeponerlaenfuncionamiento.
Desconecte el aparato de la toma de corriente y consulte al personal de
serviciocualicado.

Especicaciones:
Potencia de salida: 975W@2Ω,750W@4Ω,400W@8Ω.
Sección de preamplicador: tresválvulas12AX7s.
Potencia: 12 MOSFETs en complemento lateral.
Transformador: Transformador toroidal Aguilar.
Sección de la EQ: controles de tono pasivo con el elemento activo de rango
medio,bajo:+12/-12@40Hz;derangomedio:+12/-12@750Hz;agudo:
+12/-7@4kHz.
Interruptor Deep: proporciona 5 dB adicionales de aumento de banda ancha
a30Hz.
Interruptor Bright: proporciona 5 dB adicionales de aumento de banda ancha
a5-7kHz.
Bucle de efectos: El“Send”estambiénelconmutadorparaelniveldelíneao
deinstrumento;el“Return”estambiénelconmutadorparaelfuncionamiento
en paralelo o en serie.
Entradas: unconectordeentradadejack1/4”conuninterruptor
activo/pasivo.
Salidas: dos salidas Neutrik Speakon para altavoces, una salida balanceada
JensenXLR(-32dB)conuninterruptorpre/post-EQyuninterruptordeconex-
ión/desconexiónatierra.Salidadeanador.
Refrigeración: ventiladores silenciosos de alta calidad con control térmico de
velocidad.
Dimensiones: 43,18cm(17”)deanchox35,56cm(14”)deprofundox13,34
cm(5,25”)dealto.
Tamaño del bastidor: tresespacios,incluyeorejasderackextraíbles.
Peso: 19 kg.
Garantía: limitadadediezaños.
Opcional: conmutadordepedal,cajasTolexHeadencoloresDB,bolsode
rack.
Características del panel frontal:
Entrada:
Interruptor -6 dB: Insertaunaatenuaciónde-6dBenlarutadeseñalpara
permitirexibilidadalajustarlagananciaparaunbajoconmuyaltoren-
dimiento.
Botón GAIN: Controlalagananciadelaseccióndepreamplicador.
Interruptor BRIGHT: Proporciona5dBdeaumentodebandaanchaa5-7kHz.
Control de agudos TREBLE: +12/-7dB@4kHz.
Botón de rango medio MID: +12/-12@750Hz.