Ramiaudio AMC620 Manuel Utilisateur page 15

REAR PANEL
C - D - Signal A stereo balanced input . (Female XLR 3 pts socket).
E - F - Signal B stereo balanced input .
(Female XLR 3 pts socket)
G à L - Headphone outputs 1 to 6. (1/4" socket).
NOTE : AMC620 features an internal power
FEMELLE
15
8
1
2
3
4
5
6
7
8
Rami
headphones. This allows perfect headphone impedance matching, to avoid
accoustic pressure levels over the rules.
The setting uses dip switches : see below.
+17.5 dBu 106.5 dB SPL
+17 dBu 106 dB SPL
+15.5 dBu 104.5 dB SPL
+14.8 dBu 103.8 dB SPL
+14 dBu 103 dB SPL
+13.2 dBu 102.2 dB SPL
+12.2 dBu 101.2 dB SPL
+11.4 dBu 100.4 dB SPL
regulator to limit the power to the
Example :
The following mesures concern a DT150 BEYER
headphone, impedance 250 Ohms.
The dBu level is mesured using a 1000Hz sine just before
saturation.
The SPL dB level is mesured using a B&K 2260 sonometer
LAeq and pink noise just before saturation. The detector
is 2cm from the earpiece and the headphone is open air.
For other headphones achieve the same mesurements
and set the dip switches accordingly, to limit the SPL
level.
AMC620 is always supplied with limiter OFF (setting 1).
9
10
11
12
13
14
15
16
15
PUSH
2 1
3
+11 dBu 100 dB SPL
+10.2 dBu 99.2 dB SPL
+9.3 dBu 98.3 dB SPL
+8.5 dBu 97.5 dB SPL
+7.8 dBu 96.8 dB SPL
+7.2 dBu 96.2 dB SPL
+6.2 dBu 95.2 dB SPL
+5.7 dBu 94.7 dB SPL
next
1 : GND
2 : +
3 : -
AMC620