> ## Documentation Index
> Fetch the complete documentation index at: https://support.echotm.com/llms.txt
> Use this file to discover all available pages before exploring further.

# ATS vs. AIO Comparison

> Side-by-side hardware comparison of the Echo ATS and the Echo AIO test systems

The Echo ATS is the next-generation successor to the modular Echo AIO platform,
integrating the most-used measurement capabilities into a single compact
interface.

## Side-by-Side Comparison

| Spec                    | Echo ATS                   | Echo AIO (A / L / S / H)   | Advantage           |
| ----------------------- | -------------------------- | -------------------------- | ------------------- |
| Mic/Line inputs         | 8                          | up to 8                    | Tie                 |
| Input dynamic range     | 115 dB                     | 112 dB                     | **ATS**             |
| Input THD+N             | −110 dB                    | \< −105 dB                 | **ATS**             |
| Input gain              | 5 steps, 0 → 40 dB (10 dB) | 3 steps (1× / 10× / 100×)  | **ATS**             |
| Input coupling          | Switchable AC/DC           | AC only                    | **ATS**             |
| IEPE / CCP              | 4 mA @ 24 V                | 4 mA                       | **ATS**             |
| TEDS                    | Yes                        | Yes (IEEE 1451.4 Cl. 1)    | Tie                 |
| Line outputs            | 2                          | up to 4 (L2)               | **AIO** (count)     |
| Line out max voltage    | 8 Vrms bal                 | 16 Vrms bal                | **AIO**             |
| Line out dynamic range  | 120 dB                     | 120 dB                     | Tie                 |
| Line out THD+N          | −113 dB                    | \< −102 dB                 | **ATS**             |
| Amplifier outputs       | 4                          | up to 4                    | Tie                 |
| Amplifier power         | 10 W peak / 5 W cont.      | 10 W cont. (8 Ω)           | **AIO** (sustained) |
| Amplifier dynamic range | 108 dB (A-wtd)             | 100 dB                     | **ATS**             |
| Headphone output        | 3 Vrms, ≥ 16 Ω             | 3 Vrms, ≥ 16 Ω             | Tie                 |
| Digital I/O             | SPDIF / Word Clock         | None                       | **ATS**             |
| GPIO                    | 4 in / 4 out               | None                       | **ATS**             |
| Size                    | 11 × 2 × 8.5 in            | 17.5 × 8.75 × 1.75 in (1U) | **ATS**             |
| Power                   | 40 W                       | 60 W                       | **ATS**             |

## Bottom Line

The ATS matches or exceeds the AIO on every measurement-quality and connectivity specification. The only specifications
where the AIO still leads are higher maximum line-output voltage, higher
*sustained* amplifier power, and more line outputs in a dual-module
configuration — none of which involve audio fidelity.

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  Contact Echo for help choosing the right configuration.
</Card>