I-AMP GPT 60-IV User Manual - page 13
~ 13 ~
G p t 6 0 - I v
gpt
DESIGnS
mAnUFActurinG
Excellence Through Engineering
GPT 60-IV PANEL FUNCTIONS:
1
5
7
6 0 V A I N D U C T I O N L O O P A M P L I F I E R
-AMP
GPT 60-IV
MIC
LIN E
MASTER
LEV EL
- 3
- 9
-1 5
0 d B
-1 2
-2 1
SI G N A L PR E SE N T
PO W ER
O N
2 3
4
9
6
8
INDUCTION LOOP FUNCTIONS:
1.
Line. Unbalanced L/R level control at normal line level of -10dBv
2.
MIC. Balanced Microphone level control phantom power -15V
3.
Master level Control. The input level control provides a method of setting the required output current
level into the induction loop. This control provides gain adjust from +6dB to full attenuation. This
control affects both the balanced and unbalanced signals which are mixed together so that both
may be used simultaneously.
An internal 2:1compressor is used to reduce the dynamic range of the input audio signals. This has
the effect of increasing the intelligibility of normal audio programs to the hearing impaired by
making small sounds louder and loud sounds quieter.
The GPT 60-IV incorporates an internal fast limiter to protect against exceeding the amplifier’s
maximum output current. This limiter is not used for reducing the dynamic range of the input signal.
The input level control is in circuit before the limiter.
4.
Power on Indication LED
5.
Output Current Meter. This meter indicates the full range current capability of the GPT 60-IV with
the following sensitivities:
LED Number
LED Indicator
LED Colour
Output Current
1
0dB
Red
4.5 Amps Peak
2
-3dB
Orange
3.2 Amps Peak
3
-9dB
Green
1.6 Amps Peak
4
-15dB
Green
0.8 Amps Peak
5
-21dB
Green
0.4 Amps Peak
6
-40dB
Green
Signal Present