Dual CV 1500 RC Instructions De Fonctionnement page 12

Noise filter HIGH
By pressing the HIGH button, noise in the upper frequency
range, for example hissing of old tape recordings, is cut off.
Off-tape monitoring MONITOR
With accordingly designed tape recorders and cassette decks,
for example the cassette deck Dual C 830, the so called off-tape
monitoring signal can be connected to the amplifier and op-
tionally reproduced by pressing one of the MONITOR 1/2 but-
tons. For this purpose, the tape recorder or cassette deck is
connected to one of the inputs MONITOR 1/2 on the rear.
DIN or cynch leads can be used for MONITOR 1. Each of these
inputs can also be used as a second tape connection for recor-
ding and playback
In the case of MONITOR 1, the input sensitivity can be varied
by 12 dB with the level switch on the rear.
The buttons MONITOR 1 and 2 separate each program source
just connected from the playback circuitry and the connection
to the connected tape recorder is retained for recording. Both
buttons can be released if pressed once again. Moreover, they
release each other. As a result of this, it is possible to record
onto two tape recorders at the same time and to alternately
connect one or the other off-tape monitoring signal to the
amplifier.
In addition, the program source can be reproduced via one of
the monitor jacks whilst a tape recording is being made from a
second program source via the TAPE jacks
Important! 1f one of the MONITOR 1/2 buttons is depressed,
there is no longer acoustic control of the volume. If the volume
is now increased and the MONITOR 1/2 buttons are subse-
quently released, the volume is suddenly extremely high and
may endanger weak speakers
Tape to tape recording
If a second tape recorder or cassette deck is connected to the
AUX input, recordings can be directly dubbed onto the tape
recorder connected to the TAPE INPUT and vice versa
Microphone use
A microphone connected via the MICRO jack on the front is
connected to the amplifier input via the button MICRO ON
The microphone level is controlled with the rotary control
MICRO LEVEL and this permits mixing with the program
source selected with the INPUT SELECTION. The mixed sig-
nals (both program sources) are both controlled with the
volume control VOLUME
Ensure that the button marked MICRO ON is always switched
off (light signal off}, if no microphone is being used, in order
avoid unnecessary interferences on the other program sources.
Special accessories
Dual RC 154 infrared transmitter (included in the 1500 RC
collection)
Dual RE 120 infrared receiver
Dual DK 130, Dual DK 330 and Dual DK 830 HiFi headphones
Dual MC 304 and Dual MC 316 HiFi microphones
Technical Data
Output power
measured 4 ohms, harmonic distortion < 0.5 %
Music power 2x 100W
Continuous power according to DIN 2x 60W
measured 8 ohms, harmonic distortion < 0.5 %
Continuous power 2x 45W
Power details in accordance with FTC
20 — 20,000 Hz, harmonic distortion <0.2%,4ohms 2x 55W
20- 20,000 Hz, harmonic distortion <0.2%,8ohms 2x 40W
Harmonic distortion
at app. 2/3 rated power, 1000 Hz < 0.05 %
at 2 x 50 W from 40 Hz — 12.5 kHz <0.08 %
Power band width
as per DIN 45 500 10 Hz — 30 kHz
Attentation ratio >35
Frequency response
(measured with LINEAR key depressed)
20 Hz — 20 kHz + 0.5 dB
10 Hz — 40 kHz + 1.5 dB
5Hz—60kHzt+3 dB
Phono-inputs according to RIAA + 0.5 dB
Inputs
Tuner 150 mV, 300 mV, 600 mV at 470 kohms
Tape 150 mV, 300 mV, 600 mV at 470 kohms
Aux 150 mV at 470 kohms
Monitor | 150 mV, 300 mV, 600 mV at 100 kohms
Monitor || 150 mV at 100.kohms
Phono | 1.5 mV,30 mV,60 mVat 47 kohms
Phono II 1.5 mV at 47 kohms
Microphone 0.5 mV at 4.7 kohms
Max. input level
ref. to k = 0.5 %
high-ohmic inputs 40V
Phono | 40 mV, 80 mV, 160 mV
Phono II 40 mV
Microphone 100 mV
Tone controls
Bass at 40 Hz +15 dB, —17 dB
Treble at 15 kHz +14 dB, —15 dB
Balance control
Control range +3 dB, -12 dB
Volume control
with switchable loudness control
Stereo/Mono-switch
Monitor-switch
two, for monitoring tape recording
Microphone switch
for connecting a mono microphone to both channels
Rumble-filter
limit frequency —3 dB at 45 Hz
roll-off rate
12 dB/octave
Noise-filter
limit frequency —3 dB at 6.5 kHz
roll-off rate
12 dB/octave
Outputs
2 speaker jacks DIN 41 529,4 — 16 ohms
and 1 pressure terminal strip, 4 — 16 ohms, for two speaker pairs,
output 1 and output 2 switchable
1 coaxial jack 1/4 inch for headphone connection
1 tape output to Tape jack (DIN)
1 tape output to AUX jack (DIN)
2 line outputsto Monitor jacks (Ri = 470 ohms)
2 line outputs to Cynch jacks (Ri = 470 ohms)
Signal-to-noise ratio (typical values)
measured according to DIN related to related to
nominal output 2 x 50 mw
Input Tuner, Tape, Aux,
Monitor |, Monitor II 78 dB 54 dB
Input Phono |, Phono II 65 dB 54 dB
Input Microphone 60 dB 54 dB
Separation between channels at 1,000 Hz
between the channels > 50 dB
between the inputs >70 dB
Power consumption
Stand by approx. 6VA
non-load condition approx. 60 VA
nominal output
full-load condition
Line voltages 115 volts, 230 volts resolderable
approx. 260 VA
approx. 460 VA