Crown OC-150 User manual

Div, of lNTERNATlQNAL RADlO & ELECTRONlCS CORP. BOX 1WO ELKHART, INDIANA 46514

TABLE OF CONTENTS
SECTION I
GENERAL OPERATIQN PAGE
lntroductian ................................................................................................................. 1
Warranty & Unpacking ............................................................................................... 1
..........................................................................................................
Quick Summary 2
Front Pane[ Contrsi Functions ................................................................................... 2
Rear Panel Connectars ................... ,..... ....................*......................................... 3
Complete Ca;lnnectisn of inputs ................................................................................ 4
.............................................................................. Campiete Connection of Outputs 5
....................................................................................
Camman Usage Procedures 6
Mounting Instructions ................................................................................................ 8
..............................................................................................................
Specifications 9
SECTlON I!
TECHNlGAL DESCRIPTION AND USE
Introduction ............................................................................................................... 15
.................................................................................................
inputdOutput Sg~cs 42
........................................................................
Meter Response and interpretalion 14
....................................................................................................
Circuit &scription 48
.............................................................................
Headphone Attenuator Switches 18
Crsrsstal k & Sparation ....... .. .................................................................................... 18
Care of the 06-150 ................................................................................................... 18
.................................................................................................
220 Volt Conversion 18
.......................................................................................................
Warranty srvice 19

LIST OF ILLUSTRATIONS
...........................................................................................................................
06-350 Pictorial 1
Front Panel Control Functions ................................................................................................... 2
Rear Panel Connectors ............................................................................................................... 3
.......................................................................
Campjete Connections of the inputs (fotdsut) 4
...................................................................
Csmpfete Connections aaf the Outputs (Foldout)
5
................................................................................................................ Mounting Dimensions 8
..............................................................................................
...................
06-150 Pictorial .. II
Voltag~ and Curreat with Reactance ..................................................................................... 14
.....................................................................................................................
V-1 Output Graph $5
.....................................................................................................
Spaker impedance Curve 15
Ifmpedance - Power G~aph ...................................................................................................... 17
QG-150 Flow Diagram ............................................................................................................. 17
2-7 220 Volt Canversion ...................................................................... ... 14

With the purchase of a CROWN OCOC-%SO, you have
This is not to say that the price is the only attraction,
greatly expanded the flexibility of your Hi-Fi system.
The esthetics sf the QC-158 sma~ly match the un-
YOU now have output flexibility comparable ts the in-
clutkred styling of the acclaimed "150" line, the D-
put uet-satility made famous by the CROWN 1C-150.
158 and the IC-%5Qx The new Features arenoto%ered
Once again, this CROWN pvoduct offers uncom-
an any of our other products, and bsingthe ultimate
promised value, not in frilty gimmicks, but in hanest-
in output switching and monitoring right to your
ts-goodness Functian; a!/ at an a@raetiv~ price,
finger tips,
Please inspect "che control center for any damage in-
curred in transit. Since &he unit was carefully in-
spected and tested at the factory, it left the factory
unmarred.. If damage is found, notify the transpada-
tion company immediate3y. 6nly the consignee may
institute a claim with the carrier far damage during
shipment. However, CROWN will c~~perateSuity in
such an event, Be sure to save the cafisn as evidence
of dan2age Bar the shipper" inspection,
CROWN gr.lat.an"cee this equipment to perform as
specified. CROWN also warrants the components
and workmanship of titis equipment ta be free from
defects for a period of 90 d~y~ from date af purchase.
This warranty does nat extend to fuses+ and/or cam-
psnent or equipment damage due to negligerace,
misuse, shipping damage or accident; or if the serial
number has beew defaced, altered o~ removed.
An appficatioa for a FREE3 year VdAWRANTY TlTLE is
Even if the unit arrived in perfeet candi"fisn, as most
included with this manual. Upon receipt of this com-
do, it is advantageous to save the packing materials.
pieted form, GROWN will issue the Warranty Title -
They wilt prove valuable in preventing dan2age subject to the conditions ~sntained therein. This title
shouid there ever be an occasian to transpofl or ship applies to the original end-purchaser and will be
the unit.
issued mly upm the receipt of the application.
Be sure ta return the war~anb yegistration form to the
We urge that you take full advantage af this coverage
factory for fuil warranty-service coverage.
- fill in and mail the application now!

QUICK SUMMARY
The OC-150 is an OUTPUT CONTROL CENTER. It is connected in a hi-fi system between thepoweramplifier(s)
and the speaker system&s),
1. The meters read either VU in db, or rms equivalents of true peaks, in volts.
2. Output from 1, 2, or 3 amplifier(%) can be monitored on the meters, one at a time, switch selected.
3. Up to three speaker systems, in any combination are switch selected from Amp it1 input.
4. From input #2, three headphoneoutputs are available. The rear panel electrostaticstrip is direct. Front panel
jacks 1 and 2 are switch selected and fed through the attenuator switch, on rear panel.
A. WQLB TIME CONTROLS
D, METER/MONITBR SWlf CW
1, 2 - determine how long the meters will hold a
1 --VU - when depressed, meters act as VU
voltage reading, when in the peak mode. Variable meters. Meters calibrated in db.
from zero ta infinity.
2 -PEAK --- when depressed, meters read rms
equivalents, of true signal peaks, in vaits.
B, METERS
3 --Amp $41 - when depressed signad from in-
1,2 -- can be used to monitor output signal levels,
put #1 is fed to meterso
either VU ar PEAK, Meter scales arecalibrated in
dh and volts,
4 ---Amp $82 --- when depressed signal from ixs-
put #2 is fed to meters.
e, HEADPHONE JACKS
5 -Amp #3 --- when depressed, signal tram in-
1, 2 -- connected through headphone selector
put #3 is Fed to meters,
switch and the attenualor switch to Amp #2 input.
If intended for use with Amp #3. input, an external V@ PEAK AMP 1 AMP 2 AMP 3
jumper must be used beheen Amp #1 and Amp
#2 inputs. (See caution, page 4.)

E, RANGE SWITCH F, SPEAKER SELECTOR SWITCH
1, 2, 3, 4, 5 - determine the sensitivity of the
1 --- BN/OFF - AC power ta meter circuits.
meters, both in VU and in PEAK modes. Full scale 2,3 - HEADPHONES - select headphone jack 1
ranges are expressed in db and volts. (See and/or 2,
Impedance vs, Voltage, Power graph, page 17.)
4,5,6 - SPEAKER SYSTEMS - select any or all
(in para1 tel) of speaker systems 1,2 and 3. Wsutes
signal from input #I to selected output$s).
HEAWWNES SPEAKERS
FIG. 1-3
A. AMPLIFIER INPUTS 6% HEADPHONE BnENUATQR SWITCH
1 - Amp
- Signal fed to meters (when AMP
(Fed from input W2)
#1 is depressed) and ta speaker selector switch,
1, 2 - selects the amsurrrt of attenuatian desired
then ta selected speaker system.
(see page 6) far either headphane jack (1 and2)
2 - Amp #2 --. Sigl-rai fed ta meters, (when AMP
on front panel.
%2 is depressed) to e9ectrastatic headphane
barrier strip (D), and through the attenuatar B. ELECTROSTATIC HEADPHONE OUTPUT
switch (Cf to headphone selector switch, then to
Barrier strip type compatible with self-powered
headphone jacks on front panel.
boxes common ts many types of efectrostatitc
3 --- Amp #3 - Barrier strip type -- signal fed to
headphones. Connected directly ts Amp $42 input
meters only (when AMP #3 is depressed).
with no attenuatian,
B, SPEAKER OUTPUTS E, AC OUTLETS
(Fed frsm t nput #1 through speaker selector
Unswitched, availabie for pawering accessow
switch.) equipment (1258 watts maximum),
1, 2 -- Dual binding post type
3 - Barrier strip type
F. A6 FUSEHOLDER
Use only type MDL 188 Amp fuse,

-. Amp inputs #I, #2 and ft3 all have isolated grounds, both channel-to.
channal, and from the chassis, Amplifiers with balanced outputs may b
used without prob!tl.ms.
-- Amp tt2 input is connected to the front panel headphone jacks via the
headphone selector switch. Mechanically, these stereo jacks have
eommon grounds. To keep input #2 balanced, the ground return for
channel 1 has kn deliberately eliminated. (Strap "X", see schematic, MI-
260.) Thus input #2 can be used asa balanced input for metering only; no
signal will be present on channel 1 at the headphone jacks. The electro-
static barrier strip may be used as a balanced output.
-- Most presentmday amplifiers have a common ground between channels.
Thus strap ""Xyis not needed for normal operation. if single channel
operation is desired, then strap ""X' must be installed. Additionally, a
similar strap could be added to all inputs, and the speaker cables could be
reduced to 3mconduetor ca biss.
CAUTIONS
-- Any load connected to a balanced output must have, isolated grounds! Just
kcause electrostatic headphone hxes have four wires does not mean the
set has isolatad grounds!
Nsver parallel the OC-150 input terminals, except in the case of using one
amplifier for speakers and headphones. Any time an unbalanced input is
paralleled to another input(s), all inputs involved become unbalaneed?
41 PF
-- With strap
X connected, you cannot use a balanced amplifier (such as
any CROWN amp operating in mono) into input #2.
Far special hookwup diagram for CROWN mono amps, see lNPUI
CONNECTIONS FOLDOUT. This hook-up provides full power to the
speakers and half power to the headphone jacks.

CROWN MONO AMIF" HOOKaUF"
MOTES:
--- The gvound return for channel 1 is through the
common ground of the Input lines to the two amplifi-
ers.
-- This hook-up applies to CROWM amplifiersonly! You
must be certainof hawthegrounds are connt?eted be-
foreyou connctct anyotherampsinthis configuration.
__---
/___.---
____------
MAIN AMP
NORMAL HOOK-UP
NOTES:
--. Add two-conductorjumpers from Input #1 to input #2 for hctadphonaand
speaker output from one amplif iftr.

-0bserue proper phasing of speaksrs.
If you are using a power amplifier other than a
GROWN, be very carefui that you don't exceed the
amplifieJs power capabilities by decreasing the
load impedance too far, For example, by dt?press-
ing two speaker selectar switches and a headphone
set at the same time, the resultant impedance
would be 27 ohms, if all thraa ?ewere 8 ohm sysm
terns8
--Be certain to fuse speakers according to the manu-
facturer's recommendations.
Use headphone jacks cautiously to avoid overpower-
ing headphones or damaging hearing.