Multifunction audio test interface


The AIO-AC is a multifunction audio test interface with two amplifier outputs, two differentially balanced line-level outputs, four microphone inputs, dual DC power supplies, auxiliary GPIO control, and a standard USB audio interface in a single unit

Each microphone input features an IEPE microphone conditioning amplifier with integrated constant current supply and can also accept line level signals.

The line-level outputs can also drive headphones.

The AIO-AC provides a constant 5 volt DC power supply along with a variable DC low-power supply up to 2 volts.  The variable power supply can also measure DC current.

The auxiliary jacks each have 8 pins of software-controllable GPIO.

The AIO-AC presents a standard sound card interface and is compatible with most acoustic test software.   



4 IEPE microphone / line inputs with TEDS

2 amplifier outputs

2 differentially balanced line / headphone outputs

Fixed 5 VDC power supply

Variable 2 VDC low-power supply

8×8 auxiliary GPIO

Locking USB 2.0

USB 2.0 audio with locking connector



Sample rates48 kHz, 96 kHz, and 192 kHz
USBUSB 2.0 audio class compliant
Supported operating systemsWindows 7 or later
Audio APIsASIO, WASAPI, CoreAudio
AC PowerUniversal power supply
90 - 264 VAC at 50 or 60 Hz
Input impedance1 MΩ
Input gain1x, 10x, and 100x
Full-scale input voltage (1x gain)8.75 Vpk
Maximum input voltage15 Vpk (do not exceed)
Dynamic range (1x gain, A-weighted)> 110 dB
THD+N (1x gain, A-weighted)< -95 dB (20 Hz – 20 kHz)
Frequency response±0.5 dB (20 Hz – 20 kHz)
Constant current supply4 mA, 21 V excitation voltage
TEDSIEEE 1451.4 Class 1
Output power (THD+N < .1%)10 W continuous at 1 kHz
Maximum output voltage13.5 Vpk
Frequency response±0.5 dB 20 Hz – 20 kHz
Output power (THD+N < .1%)32 mW continuous at 1 kHz
Maximum output voltage2.65 Vpk
Frequency response±0.5dB 20 Hz – 20 kHz
Minimum load32 Ω
Fixed power supply5 VDC, 1 A
Variable power supply1 mVDC to 2 VDC, 10 mA
General purpose outputs8 pins TTL
General purpose inputs8 pins TTL
Single unit
17.5” (44.4 cm) x 8.75” (22.2 cm) x 1.75” (4.4 cm)
7.2 lbs (3.3 kg)
Single unit boxed with cables
21” (53 cm) x 10” (25.4 cm) x 5” (12.7 cm)
8.75 lbs (4 kg)
Shipping carton (6 AIOs)
22” (55.8 cm) x 22” (55.8 cm) x 17” (43.1 cm)
59.5 lbs (27 kg)

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