Crown OC-150A - Common Usage Procedures; System Switching for Speakers and Headphones; Amplifier Input Monitoring

Your OC-150A has many possible uses. The folfowing
NOTE: if you desire to eliminate all t~rn~on
discussion can be usd as 3 guide kr possible
lh~s~nps and noise, simply &%engage all
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appticatians, Your own specific equipment as well as
swa ker! headphone $witches before turning
!
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your peawplai listening habits wit! d@Permine exadly
on the pawr amplifier, Allow 5 seconds for
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how YOU use She 0@-15QA, warm-up, then select your chaice of
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1, SYSTEM SWltKCnlHE
A, SPEAKERSJHUDPHBMES
With a speaker system hmked ta each af the
three sets af outputs on the back panel, you
B. AMPtlFIERS
can select ogle or all the systsms by
depressing the apgrapriafe button(s) on the
fraot panel selector switch. Thus from an@
Iscation you can contrsl m~ia ~waker~ and
two sets of remate swakers.
IF: you
want to add headphones ta your
~y%t@rn~ UP 90 three mirs an h add~d; two
with the front pasoel jacks, and one with the
ternpal strip an t hc back panel. Either of the
two jacks can k seleded with the front panel
sele@^Ear. The terminal strip is '%gllnf"afl thc
time*
%nee high power at the hsadphone jacks
represents a p~tenbial health hazard, (such
8s shaaer@cf ear drums) your OC-1508 isf-
etudes atterauator switches which fed the
two Oleadphone jacks on tha fmnt panel. If
you turn up the volume ts drive ine8icSen"c
speakers, and then switch to an efficiant
headphone set, you wiri raed ts u* ane sf
A
the aBenuator positions,
It is goad practice ts always ttgl~a dawn the
volume, switch to an attenuator positi6n, then
carefully increa~ the volume for a csmfo~
table listening level+ Hww switch ts
headphones white wearing $he set,
The ""MAX" psitian of the attenuator switch
patches %he signal straight thraugh ts "&he
phones, The center position ipasefis a 17 db
gad, and the "MlN" position inse~s a 24 db
pad, With these combinations it should be
possible lo balance behwn swakers and
headphones, rsr Wa h~adpho~e sets, for corn-
Soflable listening tease!s.
The 06- 150A has three "amplifier-output"
inputs. The monitor switch on tha lmnit panel
$witch@$ thaw inputs into tha m~tsrinp cir-
cuit, These thme switches only progrtrm the
meterg, they do nat =lac% amplifier ~utputs,
Sa fog example, you can wled any d thrgs
amplifiers ta monitor sat the meters, but yaks
wifl rad change the autpaat to ths speker%,
(The swar%er ~wit~fit is tied dirr?ctly to Amp
#1 input),
Amp #1 input is the "main" 'input. It is m-
neeled ta the $maker $@lector switch,
Amp #2 in~ut is the headphone amplifier in-
put, and is hmked directly to the electrastatic
head phone terminal, and through the
aiMenuatcar switches ta the headphone $@lee
tar $witch.
Amp #3 input is ooly far metering, and is
hooked to the manitor switch.
If you have only one amptifier, and want: to
use speakers and headphones, a jump~r
must b6 crrnrrecterf betwen Amp #I and
Amp W2 inputs. The amplifier may then k
cannscted to either input.
CAUTION: Never cannect tw amplifier out-
puts in parailel. If a jumwr is used htween
aasy amp input terminals, ONLY ONE
AMPCllf lER MAY BE CONNECTED TO THOSE
iNPUTSI Also &cause sf $h% comwxcar*r
gfound~ at the headphone jack$, BALANCED
L!NES MAY NOT BE USED WtTH AMCaBtPg2: IN-
PUT, QR fN ANY f NPUT PARALLELLED WITH
AMP #2"