| Black | Black Anodized Front Panel. |
| J | 220 VAC/50 Hz Operation: The unit is configured to operate from 220 VAC line voltage. 117 VAC 50/60 Hz is standard. |
| MT | Multi-turn Potentiometers: Precision Multi-turn Potentiometers for Gain Control (Standard with the ES-246/XLR). |
| UL | "UL" Approved Power Supply: The unit is supplied with a UL/CSA approved wall mount power supply. |
| XLR | XLR Connectors: The terminal blocks are replaced with XLR connectors (the enclosure is doubled in height). |