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