SRM specifications
eela-audio
SRM
SRM
Broadcast mixer
MAIN OUT
Main outputs are transformer balanced signals on XLR's for driving the transmitter or studio transmitter link without any
problems with interfacing.
TAPE OUT
The same signals unbalanced on PHONO connectors for the RECORD inputs of recording equipment.
METER
Main out is permanent displayed on the internal LED PPM, a stereo 19 segment meter with DIN standard ballistics and a
range of -40 to +3dB with reference to the nominal +6 dBu output level.
LIMITER
An internal limiter guards the output level in a unique and practice oriented way: the output level is measured and compared
to a reference. If the output exceeds this threshold, a control voltage is generated and applied to all channel VCA's resulting
in a gain reduction. This means that all postfader signals, like foldback, telephone sends etc. are also held under control.
The limiter action is displayed by a LED in the meter area.
CONTROLROOM MONITOR
Four circuits are available: CR loudspeakers, CR headphones, external meter and CUE loudspeaker.
CR LOUDSPEAKERS
To be selected to desk output or to an OFF AIR receiver for a check of the entire transmission path. Can be set to automatic
change over to the CUE system.
Automatic MUTE on opening of a control room microphone channel and DIM on using the talkback facilities.
CR HEADPHONES
Reproducing the same signals as the loudspeakers without influence from MUTE- and DIM functions.
EXTERNAL METER
Connections for a second meter, wired to the control room monitoring, that can be used for pre-set or checking an input
channel via the CUE system.
CUE LOUDSPEAKER
An output for a small speaker, wired to the CUE signals with DIM and MUTE action. This speaker can be mounted in the
optional meter bridge or you can use a stand alone active speaker.
SIGNALIZATION
An opto-isolated output tor driving RED LIGHTS via a suitable interface (e.g. EA862 red-light relays unit) on opening of one
or more CR microphones.
STUDIOMONITOR
Two circuits, one for studio loudspeakers and one for presenters headphones. Can be used with EA853 studio interface.
STUDIO LOUDSPEAKER
Reproduction of all post fader signals, except those from studio microphones to prevent feedback. Can be dimmed and
overridden with talkback, unless a studio microphone is opened.
STUDIO HEADPHONES
To be used by a presenter hearing a main mix. Talkback is always possible. The talkback source is jumper selectable and
can be the internal microphone with limiter or a prefade output from a control room microphone.
SIGNALIZATION
An opto isolated output for driving RED LIGHTS in the studio to indicate open microphones there.
http://www.eela-audio.com
eela-audio
SRM
SRM
Broadcast mixer
GENERAL SPECIFICATIONS:
Voltages in dBu are referred to 0 dBu = 0.775 V
Fader position is at the 0 mark
Balanced outputs are loaded with 600 Ohms
External sources have an impedance of 200 Ohms
Noise measurements are unweighted RMS, 22 Hz to 22 kHz
Signal to noise ratio's are referred to + 6 dBu
FREQUENCY RESPONSE:
20 Hz - 20 kHz (0, -1dB)
HEADROOM:
> 20 dB
CROSSTALK:
stereo channels < - 60 dB
mono channels < - 70 dB
fader cut off < - 100 dB
SIGNAL TO NOISE:
AII faders closed - 86 dB
One channel unity gain - 80 dB
Equivalent input noise microphone channel - 126 dBu
DISTORTION:
Mic.- or line input with nominal output
< 0.03%
INPUTS:
Microphone
Line
Telephone
min. gain
28 dB
0 dB
0 dB
max. gain
78 dB
21 dB
21 dB
impedance
1700 Ohm
90 kOhm
600 Ohm
OUTPUTS:
Balanced outputs
Unbalanced o/p
Telephone send
nom. level
+ 6 dBu
+ 6 dBu
- 4 dBu
max. level
+21 dBu
+21 dBu
+10 dBu
impedance
40 Ohm
50 Ohm
600 Ohm
LIMITER:
Threshold (fixed) + 6 dBu
Attack time
10 mSec
Release time (program dependant)
Ratio (program dependant)
0.3 to 3 Sec
> 40 : 1
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