1 i 2 – Combo Symmetrical Input (Big Jack & XLR)
3 – XLR Symmetrical Output
4, 5 – Input Circuit with Symmetrical, Differential Amplifier
6 – Input Sensitivity Switch
7 – Bass Controller Switch
8 – Bass Controller
9 – Bass Controller Level Switch
10 – Active Crossover Network – High Frequency Circuit
11 – Active Crossover Network – Bass/Mid-Frequency Circuit
12 – Equalizer – Bass/Mid-Frequency Circuit
13 – Tweeter Loudspeaker Level Switch
14 – Tweeter Protection System – Limiter
15 – Bass/Mid-Range Protection System - Limiter
16 – Tweeter Power Amplifier with Protection Circuits
17 – Bass/Mid-Range Power Amplifier with Protection Circuits
18 – Two-Color LED Indicator – Power Amplifiers Clipping Indicator
19 – Loudspeaker System
20 – Power Cable Socket
21 – Power Fuse
22 – Power Switch
23 – GROUND LIFT Switch
24 – Power Supply Unit


Amplification

IO monitor is an active 2-way appliance equipped with two speakers (tweeter and woofer) and two independent power amplifiers for each speaker. Both power amplifiers operate on monolithic integrated circuits TDA7294 (16) and (17). Whereas, in filter systems the highest quality operational amplifiers BurrBrown OPA 2134 and OPA 134 have been used.

Instead of traditional potentiometers, eight-position hermetic switches have been introduced, ensuring high resistance to external factors and long-lasting, failure-free functioning.



Protection
IO monitor has several built in protection systems to reduce the risk of hazard or damage due to overloading as well as prevent against interferences.
The tweeter is protected by an electronic Tweeter Protection System limiting overdrive of its dedicated Power Amplifier. The Tweeter Power Amplifier is equipped with thermal, short circuit and over-current protections. There are also interference eliminators operating during switch-on and switch-off.

The woofer is similarly protected by its own Woofer Protection System. The woofer section is also equipped with its own thermal sensor and is protected by a specially designed Power Amplifier Controller.

The IO loudspeakers are magnetically shielded, preventing interferences with TV screen, computer monitor screen (e.g. disturbance of colors) or other equipment standing nearby.

There is also the Ground Lift Switch preventing against ground loops.