Numark dm 1550 om
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Page 1
Numark
SOUND STUDIO SERIES
MODEL IBM-1550
STUDIO MASTER
STEREO EGUALIZER MIXER
NUMARK STUDIO MASTER STEREO EOUALIZER MIXER MODEL DM- 1550 IS a sound studio control unit combining
the qualities of a broadcast mixing console with the features and fleXIbility needed by a disc jockey.
The DM- 1550 incorporates the most advanced integrated cucurts and precision components in its design and is capable of
handling any quality high powered amplifier, without the use of an external preamplifier. It is fleXIble enough to be used with
almost any auxiliary input in a ore-amplifier, integrated amplifier, or receiver. Facilities for 4 stereo program input . and two
mono program input and two microphone inputs with low cut filters.
BUILT IN SIX CHANNEL STEREO EOUALIZER
NUMAFIK DM- 1550 contains a built in stereo equalizer Incorporating the most advanced Integrated Circuits and preCIsion
components in its design. With the Numark DM- 1550 you now have at your command complete control when you make
your own recordings. to get the excellent quality you reqmre. The equalizer section was designed to allow you to control the
frequency response of your entire music system. Normal tone controls vary too much of the audio spectrum. i.e.: increasing
the low bass we also increase the middle bass which very often muddies up the whole low end. The SAME is true With the
treble control, and its effect on the high and Model DM 1550's frequency equalizer With its six independent frequency
ranges for each stereo channel can give almost an infinite number of possible frequency response variations without adding
distortion, hum or hiss. The equalizer also can be used when making recordings of old records without losing the important
portion of the music. It can eliminate the scratchy top, add a little bass if needed, and it can make some of those old records
come alive again. The DM- 1550 frequency equalizer can be used in conjunction With any eXIsting amplifier or receiver that
has tape monitoring facilities. The unit may also be used in conjunction With separate preamplifier and amplilier.
Built in low noise preamplifier for magnetic phonos and low impedance microphones.
Professional stereo slide controls.
Headphone circuit to monitor each input and output.
Talk switch to attenuate music volume -14dB so mics can be used Without readiusting music levels.
individual left and right master level controls.
Accessory microphone adapter post for convenient microphone mounting.
AC LINE OPERATION
WARNING: TO PREVENT FIRE OR SHOCK
HAZARD, DO NOT EXPOSE THIS APPLI
ANCE TO RAIN OR MOISTURE.
Page 2
SPECIFICATIONS
Input Sensitivity ...... MIC 0.5mV (-64dBMl Frequency Response . . . MIC 15 to 25000 Hz :ZdB
PHONO 1.20mVl-56dBM) PHONO 20 to 20000 Hz
LINE 70mV l-ZOdBMl (RIAA :ZdB)
Input Impedance ..... MIC 10K ohms LINE 10 to 25000 Hz -2dB
PHONO 50K ohms Equalizer Section
LINE 50K ohms Control Frequencies . . 40H1, 125Hz, 400Hz. 1.25kHz,
Input Overload ....... MIC 36dB 4.0kHz, 12.5kHz
PHONO 40dB Control Range ....... 3 15d8,Boost or Cut
LINE 50dB Control Type ........ Slide Center Detent for "Flat"
Rated Output ....... MASTER 0.775V setting
TAPE 0.775V Headphone Output
Output Impedance . . . . 100 ohms (CUE) ........... 360rnV at 8 ohms at 0.5% T.H.D.
Harmonic Distortion . . . At Rated Output 0.085% Talkover Switch ...... OFF -14dB
At 4V RMS Output less than Power Consumption . AC 120V 60H: 8 Watts
0.5% Dimensions ......... W 15%" x D 10" x H 46"
Signal to noise Radio . . . MIC -58dB Shipping WEIQ' ------ 11 IS.
PHONO ~62dB
LINE -70dB
FEATURES
INPUT
Both phono inputs CH1 and CH-2 are for magnetic cartridges and have stereo input level slide controls. With the Input Level
Control in the "Min position no output is obtained; with the Input Level Control at "Max" full output is obtained.
The Input" jacks are marked CH-l and CH-2 and the stereo turntable cables should be plugged in with the proper left IL) and
right (RI designation as per the turntable manufacturers instructions.
OUTPUT
Output iacks on the back ol the SET should be connected to the stereo receiver amplifier or integrated power AMP input
marked AUX INPUTS. The Output is a stereo output and is marked Left IL) and Right IR). Shielded output cable must be
used.
HEADPHONE
The headphone jack on the front panel is for headphone monitoring of either input CH-1/2/3/4 and output. Select the chan»
nels by the "MONITOR SELECT" switch used for monitoring CH-1/3, CH-2/4 or OUTPUT - use the HEADPHONE LEVEL
Control to adjust headphone volume.
MIC OR HEADPHONE WITH MIC
When using a headphone with an attached microphone or microphones the microphone plugs must be plugged into either
MIC INPUT marked CH-3 or CH4 jacks on the rear panel, To control MIC OUTPUT volume the corresponding MIC
VOLUME control CH-3 or CH4 on the front panel is used.
Mlc LOW CUT FILTER
Allows for attenuation of wind, rumble and other low frequency noise for microphone. Low frequencies can be rolled off at
250 Hz or left the frequency response flat in the off position.
POWER OUTPUT METERS
Power output meters light when power is in "ON" position and monitor the output of left and right channels OVU Level
0.775 independently.
SIX CHANNEL STEREO EOUALIZER
Left and right channels-simultaneously with one slide control for each of six frequency range.
40Hz. 125Hz, dOOI-Iz, 1.25kHl. 4.0kHz. 12.5kHz. Activate for CH4 and CH-2,
EOUALIZER DEFEAT PROVISION
The equalizer section can be deleted from the mixer by switching the equalizer defeat switch to defeat position.
To activate equalizer switch to "ON" position