7
* The notch and shelving filters adjustments, AutoCal
TM
and GLM
TM
manual system calibration features are part of the Genelec Loudspeaker Manager (GLM
TM
) software
AMPLIFIER SECTION
SIGNAL PROCESSING SECTION
SySTEM SPECIFICATIONS
1238CF
Lower cut-off frequency, –3 dB
< 55 Hz
Upper cut-off frequency, –3 dB
> 20 kHz
Free field frequency response
57 Hz – 20 kHz (± 2.0 dB)
Maximum short term sine wave acoustic
output on axis in half space, averaged from
100 Hz to 3 kHz
@ 1 m > 117 dB SPL
Maximum long term RMS acoustic output
in same conditions with IEC weighted noise
(limited by driver unit protection circuit
@ 1 m > 107 dB SPL
Maximum peak acoustic output per pair with
music material
@ 2 m > 124 dB
Self generated noise level in half space at 1 m
on axis (A-weighted)
< 15 dB
Harmonic distortion at 90 dB SPL at 1 m on
axis
Freq:
60…100 Hz
> 100 Hz
< 1 %
< 0.5 %
Drivers
Bass
Midrange
Treble
2 x 210 mm (8") cone
125 mm (5”) cone
25 mm (1") metal dome
All drivers are magnetically
shielded
Weight
42 kg (93 lb)
Dimensions
Height
Width
Depth
610 mm (24”)
470 mm (18
1
/
2
”)
257 mm (10
1
/
8
”)
1238CF
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 unit
protection circuitry
150 W at 4 Ohm load
120 W at 8 Ohm load
120 W at 8 Ohm load
Slew rate
80 V/us
Amplifier system THD at nominal output
< 0.05 %
Signal to Noise ratio, referred to full output
Bass
Midrange
Treble
>100 dB
>100 dB
>100 dB
Mains voltage
Mains voltage operating range
100/200 or 115/230 V
-10 to +10 %
Power consumption (average)
Idle
Full output
23 VA
330 VA
1238CF
Digital signal input connector
XLR female 110 kOhm
Digital signal output / Thru connector
XLR male 110 kOhm
Analog signal input connector
XLR female, balanced 10 kOhm
AES/EBU Single Wire or
Dual Wire
AES/EBU Single Wire or
Dual Wire
pin 1 gnd, pin 2 +, pin 3 -
Digital audio
Word length
Sample rate
16 - 24 bits
32 - 192 kHz
Control network
Type
Connection
Proprietary GLM™ network
2 RJ45, CAT5 cables
Crossover frequency
Bass/Mid
Mid/Treble
420 Hz
2.8 kHz
GLM
TM
software frequency response adjust-
ment *
Notch filters
Shelving filters
4 LF and 2 HF
2 LF and 2 HF
System calibration
Auto Cal™, Stand-alone
Figure 5: Horizontal directivity of the 1238CF.
Figure 4: Vertical directivity of the 1238CF.
