 Some Twins were fitted with EVM 12L variant speakers known as EVM 12Fs.Unlike most Electrovoice speakers, they were fitted with metal dustcovers like the JBL D-120Fs.Twin Reverb amplifiers came standard with "tilt back legs" which allowed the amplifier to be tilted at an angle backwards, so the speakers faced at a more upward angle, promoting better distribution of their output to an audience when placed on a low stage.