Crown D-150 Service Manual page 39

A. Wire Changes
' d e Remove the bwo screws (adjacent to the inputs and gains)
from the board-cover. Lift cover straight up. _
2-Ground No; input-(chan.1)-by soldering a" barewire (as
shown in-Figure- 1) between points A and 8.
3. Connect @ YOK, 1%, 4w resistor — with sleeving on both
leads -- between points C and D, using pre-drilled holes.
B. Operation
1. Make output cable as shown in Figure 2.
2. Connect one lead to "HOT" (red) amplifier output-post of
channel.1, the other tead.to."HOT" of channel 2.
CAUTION: DO NOT CONNECT EITHER "HOT" OUT-
PUT. TO.GROUND (EITHER. BLACK.POST),
3. Connect an S ohm (or higher) load to the output cable. A
fuse is recommended!
4. Connect input signal,.using std. % phone plug, to channel 2
inpatjack: The "channel:-2" gait Gnput level contra may
be adjusted for desired output-level,
5. The 2-wire AC powercord meets U/L requirements, but
many installations will require.a3-to-2 wire adapter to avoid.
"ground-loops" — circulating currents caused by more than
one ground-path.
C, Specifications
F-Resp. .18db 20 Hz-20 KHz 1W 8 Ohm
dAleb 4 Hz-60 KH? 1W.8 Ohi.
Power Resp. +1db § H2-15 KHz 250W 8 Ohm
Power at Clip Pt. Typically 320W into B ohm 1 KHz
Total Gutput (IH) Music Power 400W 8 Ohm 210W 16 Ohm
IM Distortion, Less than .1% from. 1OmW to full output.
Typically .01% at 250W
Darnping Factor
Hum and Noise
(20Hz-20KH2)
Slewing Rate
Lead Impedance
Output Signat
Input Sensitivity
input Impedance
Voltage Gain
Protection
Power Supply
Greater than 140 Zero - 1KHz8 Ohm
110 db below 250W (typically 117db)
12 Volts/Microsecond
8 Ohm or higher (complete stability with
any load)
Balanced
1.1V-for 250 inte 8 Gh
25K Nominal
32.306 2.200
Short, mismatch, and open circuit proof,
V-t limiting is instantaneous with~ no
annoying thumps, cutout, etc, Thermal
switch in AC line protects against over-
heating caused by insufficient, ventia-
tion. Controlled slewing rate. voltage
amplifiers protect overall arnptifier
against RF burnouts.
Two massive capacitors with energy stor
age exceeding 20 joules. Total of two reg-
ulated supplies for complete isolation
and stability. No fuses except for AC
power fine.
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