Multifunction Audio Test Interface


The Echo AIO-AC is a multichannel acoustic interface designed for production-line testing and QA/QC verification. Combining two 10W amplifier outputs, two balanced line-level/headphone outputs, four mic/line analog inputs, 8 GPIO inputs, 8 GPIO outputs, 5V DC power supply, and variable 2V DC power supply for battery simulation in a single unit, the AIO-AC is an integrated, cost-effective, and reliable high-throughput audio test solution.

Each input can be individually configured as a line level input or as a measurement microphone input. Microphone inputs include an IEPE microphone conditioning amplifier with integrated constant current power supply (CCP). Line level outputs can also drive most headphones. The variable 2V DC power supply can also measure DC current.

The AIO-AC presents a standard USB audio sound card interface and is compatible with most audio test software including APx Flex, LabVIEW, Soundcheck, and ARTA.



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 bandwidth72 kHz
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) with 8Ω load
Minimum load600 Ω
Full-scale output voltage2 Vrms (+6 dBV)
Frequency response±0.02 dB (20 Hz – 20 kHz)
Output bandwidth (-3 dB)90 kHz
Dynamic range (A-weighted)> 117 dB
THD+N (A-weighted)< -100 dB (20 Hz – 20 kHz)
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 (4 AIOs)
22” (55.8 cm) x 22” (55.8 cm) x 12.6” (32 cm)
42.5 lbs (19.3 kg)

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