Ingram Engineering MPA685, Owner'S Manual

Page: 14 / 22

MPA685 Owner’s Manual
3/2012
14
AUDIO SPECIFICATIONS
(T
A
=+25°C unless otherwise noted)
Parameter Min Typ Max
Unit Comments
Microphone Input Impedance, Option 2
Low Setting 600 Ω
Medium Setting 1.5k Ω
High Setting 2.5k Ω
Instrument DI Input Impedance 1 M Ω Direct input and loopthrough
Nominal Gain, Input Impedance Option 2 29 dB Mic Input, Low Setting
Input Switch Set to Position 0 34 dB Mic Input, Medium Setting
35 dB Mic Input, High Setting
28 dB Direct Input
Max Gain, Input Impedance Option 2 70 dB Mic Input, Low Setting
Input Switch Set to Po12 75 dB Mic Input, Medium Setting
76 dB Mic Input, High Setting
69 dB Direct Input
Stepped Switch Gain Change vs. Switch
Position
4
dB /
Step
Switch Positions –11 to -10
2
dB /
Step
Switch Positions -10 to +4
3
dB /
Step
Switch Pos4 to +7
4
dB /
Step
Switch Pos7 to +10
5
dB /
Step
Switch Pos10 to +11
6.5
dB /
Step
Switch Pos11 to +12
Stepped Switch Amplitude Error
Between Steps
0.2 dB Switch Positions –11 to +12
Gain Matching Between Left and Right
Channels
0.3 dB
Frequency Response <10 >90k Hz Mic Input, Low Setting
±3.0 dB, Gain Setting = 0 <10 >50k Hz Mic Input, Med Setting
Option 2 <10 >50k Hz Mic Input, High Setting
150 Ω Mic Source Impedance <10 >500k Hz Direct Input
High Pass Filter 70 Hz
-3.0 dB High Pass Frequency 140 Hz
Total Harmonic Dist Noise 0.005 % +4 dBu
<10 Hz to 22 kHz BW, No Weighting 0.1 % +29 dBu
100 k Ω Load 1.0 % >+30 dBu