CARVIN BX250 - Page 2

BX250/MB COMBO CONTROLS
1. INPUT JACK
The1/4”phonejackisahighimpedanceinstrumentinputdesignedto
handle both active and passive basses in connection with the ACTIVE
switch.
2. JEWEL LIGHT
BLUE = POWER ON/SYSTEM NORMAL
RED = STARTUP/MUTE/COMP/PROTECT
ThePOWERswitchturnsontheamplifier,andwhenthejewellightturns
BLUEtheampisreadyforuse.
The jewel light turns RED under different conditions. RED first appears at
POWERONforafewsecondswhiletheampstartsupandischeckedby
protectioncircuits.AsolidREDwillindicatetheMUTEswitchisengaged.
RED will FLASH as the COMPRESSOR is working. A solid RED (not
MUTEswitched)canalsoindicateaPROTECTmode,mostlikelyifthe
SPEAKEROUTPUTisshortedorifitisloadedbelowit’sminimumrating.
IfthepowerindicatorturnsOFF,orsolidRED(notmuted)whileplaying,
resettheampbyturningthePOWERswitchOFFforabout10seconds.
Checkanyexternalspeakerconnections.TurnthePOWERswitchbackON.
3. MUTE SWITCH
TheMUTEswitchturnsoffthesignaltotheamplifierandtheDIRECT
OUT.TheJEWELLIGHTchangestoREDtoindicatetheMUTEswitchis
on.TheMUTEswitchisidealforchangingbasses,silenttuningon-stage,
orheadphone-onlypractice.TheTUNER/PHONESoutputisnevermuted.
(BX250head:MUTE=in)
4. ACTIVE SWITCH
FliptheACTIVEswitchtotheDOWNpositionforstandardbasspickups.
If your bass uses a battery with an onboard active preamp, put the switch
intheUPposition.(BX250head:ACTIVE=in)
5. DI LEVEL (DIRECT OUT, PHONES)
TheDILEVELcontrolstheoutputleveloftheXLRDIRECTOUTandthe
1/4”PHONES/TUNERjack.TheDIlevelisnotaffectedbytheMASTER
level.UsePRE/POSTswitchtoselectiftheDRIVE,COMPRESSORand
TONEcontrolsaffectthissignal.
6. DRIVE CONTROL
The DRIVE control adjusts the input level to the CLASS A preamps. The
DRIVE control serves two purposes. The DRIVE can be used to adjust the
input sensitivity for the differences in bass pickups. The DRIVE will also
change the harmonic content of your sound. Turning the knob closer to
10 will create a more overdriven tone. The DRIVE will also change the
volumeoftheamplifier,useitincombinationwiththeMASTERcontrol
to achieve the desired volume.
7. CONTOUR CONTROL
TheCONTOURcontrolprovidesavariablemid-rangescoop.Whenthis
controlissetto“FLAT”thereisnochangetothemid-rangefrequencies.
As you turn the contour control clockwise, the mid range is scooped at
thecenterfrequency at 350Hz.WhentheCONTOURcontrol isset to
maximumthemid-rangeiscutby-15dBat500Hz.
8. BASS AND TREBLE TONE CONTROLS TheBASSandTREBLE
controls are custom shaped tone controls designed to deliver punchy lows
andcrisphighsforavarietyofbasssounds.Whenacontrolisturnedto
the right it boosts the signal and when turned to the left cuts the signal.
TheaffectedfrequenciesfortheBASSstartat80Hzandcandeliveragreat
dealofvolume.Becarefulnottodistorttheoutputoroverpoweryour
speakers.TheaffectedfrequencyfortheTREBLEcontrolbeginsat5kHz
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