I/O


IO studio monitor is an active 2-way appliance equipped with two speakers (tweeter and woofer) and two independent power amplifiers for each speaker fixed on the back plate of the monitor enclosure, as well as with an appropriate set of precise regulators, signalizes, inputs and security devices.

Both speakers applied in I/O are produced by well known company SEAS from Norway. The woofer is a construction meeting the APS strict requirements. Like its bigger brother IO monitor is offered  with  fabric dome tweeter.

The monitor has been closed in the bass reflex enclosure with front ventilation. The cabinet design combining small dimensions with thick front and side walls ensures extremely rigid base for speakers and electronic module mounted in it. The edges of the monitor enclosure have been rounded to reduce reflections and to improve the quality of produced sound. The inner wall of the enclosure that completely separates the electronic module from the speaker chamber constitutes at the same time an additional reinforcement of the enclosure eliminating minute oscillations of the monitor enclosure side walls.

Black semi-gloss lacquer is the standard finish of IO .
After market success of AEON, which is designed for listening in near-medium field it was a challenge for us and “natural” step forward into pro-audio world to create an active nearfield studio monitor. This is how IO was created.

High-quality components used for construction of IO and well thought-out acoustic design have resulted in perfect linearity of processing, at the same time preserving natural sound timbre. Detailed music transfer and sensational stereophony make IO comparable only to the best in the world designs for listening in the near field.

Sturdy design and small monitor size make it an excellent proposal for discerning users having smaller listening rooms, and also those with extended sound processing systems who are looking for reference nearfield monitors.
Field Monitor Near
Type

Active – two power amplifiers:

  • Tweeter: monolithic integrated circuit TDA7294
  • Woofer: monolithic integrated circuit TDA7294
System Two-way
Crossover Frequency 1.5 kHz (slope: 24 dB/octave)
Dimensions: Height x Width x Depth 33 cm x 21 cm x 30 cm / 13.0'' x 8.3'' x 11.8''
Free Field Frequency Response +/- 2 dB: 44 Hz - 30 kHz
SPL in Free Field @ 1m RMS: 104 dB
Peak: 112 dB
Weight 13 kg / 28.6 lbs
Loudspeakers  
Bass/Mid-Range Loudspeaker Ø 7''
Diaphragm: cellulose, surround: rubber
Magnetically Shielded
Tweeter loudspeaker Ø 1''
  • Fabric dome

Magnetically Shielded
Amplifiers  
Bass/Mid-Range Power Amplifier 70 W RMS @ 8Ω
Tweeter Power Amplifier 70 W RMS @ 6Ω
Total Harmonic Distortions 0.005 % – PO = 5 W, f = 1 kHz
0.1 % max – PO = 0.1 up to 50 W, f = 20 Hz up 20 kHz
Signal to Noise Ratio 103.5 dB – weighted by A curve
101 dB – in band of 20 Hz up to 20 kHz
Input Voltage Level for 100 dB SPL in Free Field @ 1m 0 dBu (i.e. 0.775 V) – calibrated regulators in 0 dBu, 0 dB positions
Calibrated Controls  
Input Sensitivity Switch 30dBu, 22dBu, 15dBu, 9dBu, 4dBu, 0dBu, -3dBu, 10dBV
Bass Controller Level Switch -15dB, -12dB, -9dB, -6dB, -3dB, 0dB, 3dB, 6dB
Bass Controller Switch Position ON: bass-reflex with active filter
Position OFF: "clear" quick bass-reflex
Tweeter Loudspeaker Level Switch -5dB, -3dB, -1.5dB, -0.5dB, 0dB, 0.5dB, 1.5dB, 3dB
Inputs, Outputs  
Input Two Types (common socket Combo):
  • XLR symmetrical (balanced)
  • TRS symmetrical (balanced) 6.3 mm

Input Impedance 10 kΩ
„Loop Through” Output XLR symmetrical
Output Impedance 100Ω
Protections  
Tweeter Loudspeaker Protection Limiter (optical)
Bass/Mid-Range Loudspeaker Protection Limiter (optical)
Power Amplifiers Protections Interference, thermal, short circuit and over-current  limiters
 

Description

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AEON's younger brother, IO is a natural evolution of the APS speaker range. Designed as a near field monitor it benefits from all the technological solutions used in AEON, such as the Bass Controller.

High-quality components used for its construction and a very efficient acoustic design have resulted in perfect linearity, preserving the natural sound timbre. Detailed music transfer and sensational stereophony make IO one of the most serious contenders in the market of high end near-field monitors.

Sturdy design and small size factor make it an excellent choice for demanding users whose space requirements are on top of their list.

Little by size, big by sound it will give endless hours of effortless and yet extremely detailed experience to the professionals and discerning amateurs alike. Great for precision EQ and Comp work.

Technical specifications

Near-field monitor

Type Active – two power amplifiers

Tweeter: monolithic integrated circuit TDA7294
Woofer: monolithic integrated circuit TDA7294
System Two-way
Crossover Frequency 1.5 kHz (slope: 24 dB/octave)
Dimensions Height x Width x Depth
33 cm x 21 cm x 30 cm / 13.0" x 8.3" x 11.8"
Free Field Frequency Response ±2 dB: 44 Hz - 30 kHz
SPL in Free Field @ 1m RMS: 104 dB (single)
Peak: 112 dB (pair)
Weight 13 kg / 28.6 lbs

Loudspeakers

Bass/Mid-Range Loudspeaker Ø 18 cm / 7"
Diaphragm: cellulose, surround: rubber
Magnetically Shielded
Tweeter loudspeaker Ø 2.5 cm / 1" in two versions:
Titanium dome
Fabric dome

Magnetically Shielded

Amplifiers

Bass/Mid-Range Power Amplifier 70 W RMS @ 8Ω
Tweeter Power Amplifier 70 W RMS @ 6Ω
Total Harmonic Distortions 0.005 % – PO = 5 W, f = 1 kHz
0.1 % max – PO = 0.1 up to 50 W, f = 20 Hz up to 20 kHz
Signal to Noise Ratio 103.5 dB – weighted by A curve
101 dB – in band of 20 Hz up to 20 kHz
Input Voltage Level for 100 dB SPL in Free Field @ 1m 0 dBu (i.e. 0.775 V) – calibrated regulators in 0 dBu, 0 dB positions

Calibrated Controls

Input Sensitivity Switch 30dBu, 22dBu, 15dBu, 9dBu, 4dBu, 0dBu, -3dBu, -10dBV
Bass Controller Level Switch -15dB, -12dB, -9dB, -6dB, -3dB, 0dB, 3dB, 6dB
Bass Controller Switch Position ON: bass-reflex with active filter
Position OFF: "clear" quick bass-reflex
Tweeter Loudspeaker Level Switch -5dB, -3dB, -1.5dB, -0.5dB, 0dB, 0.5dB, 1.5dB, 3dB

Inputs, Outputs

Input Two Types (common socket Combo):
XLR symmetrical (balanced)
TRS symmetrical (balanced) 6.3 mm

Input Impedance 10 kΩ
„Loop Through” Output XLR symmetrical
Output Impedance 100Ω

Protections

Tweeter Loudspeaker Protection Limiter (optical)
Bass/Mid-Range Loudspeaker Protection Limiter (optical)
Power Amplifiers Protections Interference, thermal, short circuit and over-current limiters

Design

IO studio monitor is an active 2-way appliance equipped with two speakers (tweeter and woofer) and two independent power amplifiers for each speaker fixed on the back plate of the monitor enclosure, as well as with an appropriate set of precise regulators, signalizes, inputs and security devices.

Both speakers applied in IO are produced by well known company SEAS from Norway. The woofer is a construction meeting the APS strict requirements. Like its bigger brother IO monitor is offered in two versions: with a titanium or a fabric dome tweeter.

The monitor has been closed in the bass reflex enclosure with front ventilation. The cabinet design combining small dimensions with thick front and side walls ensures extremely rigid base for speakers and electronic module mounted in it. The edges of the monitor enclosure have been rounded to reduce reflections and to improve the quality of produced sound. The inner wall of the enclosure that completely separates the electronic module from the speaker chamber constitutes at the same time an additional reinforcement of the enclosure eliminating minute oscillations of the monitor enclosure side walls.

Black semi-gloss lacquer is the standard finish of IO.

Electronics

Legend

1, 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.

 

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