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1237A and 1238A Operating Manual
SySTEM SPECIFICATIONS
Lower cut-off frequency, –3 dB
Upper cut-off frequency, –3 dB
Free field frequency response,
± 2.5 dB
Maximum short term sine wave
acoustic output on axis in half
space, averaged from 100 Hz to
3 kHz @ 1 m
Maximum long term RMS acous-
tic output in the same conditions
with IEC weighted noise (limited
by driver protection circuit) @
1 m
Maximum peak acoustic output
per pair in a listening room with
music material @ 2 m
Self generated noise level in
free space at 1 m on axis (A-
weighted)
Harmonic distortion at 95 dB
SPL at 1 m on axis
Freq:
50...200 Hz
> 200 Hz
Drivers
Bass
Midrange
Treble
All drivers are magnetically
shielded
Weight
(monitor with integrated amplifier)
Weight
(monitor with amplifier removed)
Amplifier weight
Dimensions
(monitor enclosure)
Height
Width
Depth
Amplifier dimensions
(in rack mount configuration)
Height (front panel)
Height (amplifier casing)
Width (front panel)
Width (amplifier casing)
Depth
1237A
1238A
< 35 Hz
< 33 Hz
> 21 kHz
> 21 kHz
37 Hz – 20 kHz
35 Hz – 20 kHz
> 118 dB SPL
> 121 dB SPL
> 112 dB SPL
> 116 dB SPL
> 122 dB
> 124 dB
< 10 dB
< 10 dB
< 3 %
< 1 %
< 0.5 %
< 0.5 %
305 mm (12 in)
385 mm (15 in)
cone
cone
125 mm (5 in)
125 mm (5 in)
cone
cone
25 mm (1 in)
25 mm (1 in)
metal dome
metal dome
42 kg (93 lb)
57 kg (126 lb)
36 kg (80 lb)
51 kg (113 lb)
6 kg (13 lb)
680 mm (26
3
/
in)
810 mm (32 in)
4
400 mm (15
3
/
in)
480 mm (19 in)
4
380 mm (15 in)
420 mm (16
1
/
2
3
3U 132 mm (5
/
in)
6
80 mm (3
1
/
in)
8
483 mm (19 in)
425 mm (16
3
/
in)
4
252 mm (9
15
/
in)
16
AMPLIFIER SECTION
Bass amplifier short term output
power
Midrange amplifier short term
output power
Treble amplifier short term output
power
Long term output power is limited
by driver protection circuitry
Amplifier system THD at nominal
output
Signal to Noise ratio, referred to
full output
Bass
Midrange
Treble
Mains voltage
Power consumption
Standby
Idle
Full output
SIGNAL PROCESSING SECTION
Analog signal input connector
XLR female, balanced 10 kOhm
Maximum analog input signal
Analog input sensitivity
(100 dB SPL at 1 m)
Analog input gain selection
Digital signal input connector
XLR female 110 Ohm
Digital signal output / Thru
connector XLR male 110 Ohm
Digital audio input
Word length
Sample rate
Digital input sensitivity
(100 dB SPL at 1 m )
in)
Digital input gain selection
Control network
Type
Connection
Crossover frequency
Bass/Mid
Mid/Treble
GLM
TM
software frequency
response adjustment
Notch filters
Shelving filters
System calibration
1237A
1238A
500 W
250 W
200 W
< 0.01 %
>115 dB
>115 dB
>115 dB
100-240 VAC, 50/60 Hz
<0.5 W
25 W
750 W
1237A
1238A
pin 1 gnd
pin 2 non-inverting,
pin 3 inverting
+25.0 dBu
-6 dBu
0, +6, +12, +18 dB
AES/EBU Single Wire or Dual Wire
AES/EBU Single Wire or Dual Wire
16 - 24 bits
32 - 192 kHz
-30 dBFS
0, +6, +12, +18 dB
Proprietary GLM™ network
2 RJ45, CAT5 cables
450 Hz
420 Hz
3.0 kHz
3.0 kHz
4 LF and 2 HF
2 LF and 2 HF
Genelec GLM AutoCal™
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