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Engl E670 - Speaker Output and Impedance Management

Engl E670
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70LINEOUTSTATUS
ThisbuttonselectsthesignalsourcefortheLineOutsignalroutedtotheXLRport(72).
WhensettoOFF,thelinesignalistappedfromthepreamp.
WhensettoON(pushedin),thelinesignalistappedfromthepoweramp.Atleastone
speakermustbeconnectedforthisoption!
The ENGL Special Edition's preamp and power amp supply two different signals. The
reason for this is that the Presence control, Depth Boost button, power tubes and
outputtransformerallshapethepowerampsignal'stone.Youmayhavetoadjustthe
voicing controls on your amp, mixer desk or recorder to adjust the line out signal
accordingly.
This switch assigns pin 1 of the XLR port (72) to ground (Ground to Pin 1). You'll find
that this is a handy option when you want to earth the circuit you have routed to a
mixingconsoleorrecordingdevice.
You encounter something called a ground loop if your amp is
connected to a mixing console or recording gear and pin 1 of both devices' XLR
connectors serve as ground terminals (the XLR Ground button on the amp is set to
Ground to Pin 1). A ground loop is readily identified by the infernal humming
emanatingfromyourspeakers.Setthisbuttonto tosolvetheproblem!
This is a frequency-compensated, balanced XLR line output. Pins 2 and 3 of the XLR
jack carry the signal, pin 1 = N.C. or ground depending on the position of the Ground
switch(71). Refertopage46tolearnmoreaboutthis.
Dial in thedesired signallevel for the balanced Line
OutbyadjustingtheLevelknob(68).
You can patch signals routed through these outputs directly to the balanced inputs a
mixing console or recording gear. The advantage of a balanced circuit is that it is
immune to ground loops, provided of course it is wired correctly. You can also patch
the line out signal to an unbalanced input using an adapter. To do this, you'll need a
shielded cord equipped with an XLR connector and anRCA connectoror ¼"plug that
bridgesthesignal (pin 2 or3) and groundcircuits. Be sureto set thebutton to Ground
toPin1.
Thisis B2jack,whichiswiredinparallelto .Aspeakermustbe
connected to this or the B1 jack for the Speaker A/B switching option to be enabled.
ThepowerampsignalisroutedtooutputsB2andB1when isactivated.
Use (74)toset the impedance for thespeaker connected to this
output or the overall impedance when two cabinets are connected to and
.
A tip from the designer:
71XLRGROUND
IMPORTANT NOTE:
72LINEOUTBALANCED&FREQU.COMP.
Atipfromthedesigner:
73POWERAMPOUTPUTB:OUTPUTB2
GroundLifted
PowerampOutputB's B1
SpeakerA/B
ImpedanceSelectorB
Output B2
B1
Thesignalroutedtothisoutput
limits the responseof a4x12" cab.
26

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