Axxent ISV 1090 사용자 설명서 - 페이지 9

{카테고리_이름} Axxent ISV 1090에 대한 사용자 설명서을 온라인으로 검색하거나 PDF를 다운로드하세요. Axxent ISV 1090 10 페이지. Universal induction loop amplifier

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THE CONTROLS (Front)

MIC 1, MIC 2

Left on the front side you will note four control knobs. The

two left ones control the microphone input level. On the rear

you will find the two corresponding 3pin XLR connectors. As

already described on the previous pages, the input sensitivity

of these inputs may be altered via small internal potentiome-

ters, located on the printed circuitry board. Phantom power

(48 V) for condenser microphones can be activated separate-

ly for each input via DIP switches labelled „PHAN 2 1" (lower

ON position).

LINE 1, LINE 2

Right from the MIC potentiometers you will note two control

knobs for the line signals. The corresponding connectors are

also located on the rear side. Line 1 is a balanced 3pin XLR

connector (female), while LINE2 is equipped with a 4 pole

Phoenix connector. A+/A- and GND is the balanced line input,

while V+ with GND represents the 22 v DC output, intended

as power supply for external microphone preamplifiers.

DRIVE, DRIVE CURRENT

The DRIVE control sets the output power (output current) of

the amplifier indicated by the LED chain. The "normal" safe

level is represented by the green LEDs, while the red LEDs

should only be lit at absolute level peaks.

HEADPHONE SYMBOL

This is the input connector for any type of headphones with

standard phone plug 3.5 mm in order to check the audio

signal for distortion or other anomalies.

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ISV 1090 Universal Induction Loop Amplifier

COMPRESSION

In the centre of the front side you see an LED chain, label-

led COMPRESSION. The bargraph indicates the amount of

compression, e.g. how much the dynamic range between the

lowest audible signal and the maximum peak levels are com-

pressed. This compression facilitates intelligibility especially

for the "quiet" low level signals, highly appreciated by hearing

impaired persons.

METAL

This potentiometer allows compensation of frequency ano-

malies, caused by metal parts or tubes located in vicinity of

the induction loop. In order to determine these frequency

response anomalies, we recommend the use of an induction

loop measurement instrument.

TEMP

The red TEMP LED lights when the maximum operating tem-

perature is exceeded. If it lights up continuously, the induction

loop is probably not properly sized or the amplifier is overdri-

ven. Please check out these potential trouble causing sources.

POWER

Green LED indicator confirms activated POWER switch on

the right (ON).

User Manual