The ALI20/25 are audio line isolators designed to isolate audio devices from each other. In most cases, they are used to avoid hum caused by ground loops in audio systems. They offer a complete passive solution for the isolation of a stereo balanced audio signal. It features dual XLR in- and output connectors and a ground lift switch. The in- and output phase are matching. The ALI20/25 are both built with an audio transformer that has a turns ratio of 1:1 and an impedance of 600 Ohm. The difference is the shielding of the transformer. The ALI20 contains a shielded transformer which complies with the requirements of most standard applications, while the ALI25 contains a MU-metal shielded transformer which can be used when regular shielding becomes inadequate. This ensures the best results in even the highest EMI polluted environments.
| ALI20MK2 | Shielded |
| Inputs | Impedance | 600 Ω |
| Connector | 2 x XLR female | |
| Outputs | Impedance | 600 Ω |
| Connector | 2 x XLR male | |
| Turn ratio | 1 : 1 | |
| Bandwidth | 0.8 Hz - 100 kHz | |
| Typical distortion (@ 1 kHz) | 0.001% | |
| Frequency | High | -3 dB Cutoff 105 kHz |
| Low | -3 dB Cutoff 0.8 Hz | |
| Response | 20 Hz | -0.09 dB (reference 1 kHz) |
| 20 kHz | -0.10 dB (reference 1 kHz) | |
| Max. Inputs Level (@ 1% THD+N) | 20 Hz | +2 dBu (0.975V) |
| 50 Hz | +10 dBu (2.449V) | |
| THD+N (@ 1 kHz) | 0.035% (@ 20 Hz and -20dBu (typical)) | |
| < 0.001% (@ 1 kHz and -20dBu (typical)) | ||
| Dimensions | 3.78 x 1.69 x 4.25 " (W x H x D) (ALI25) |
| 4.25 x 1.73 x 6.50 " (W x H x D) (ALI20MK2) | |
| Weight | 0.60 lb (ALI25) |
| Colours | Black |
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