The ALI20/25 are audio 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 | Microphone level: (-40 dBV) | 20 Hz - 20 kHz |
| Line level: (0 dB) | 100 Hz - 20 kHz | |
| THD+N | Microphone level: (-40 dBV) | 1% (20 Hz – 20 kHz) |
| Line level: (0 dB) | 1% (100 Hz – 20 kHz) | |
| 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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