rob aylestone
Moderator
We appreciate many of the old mics that are either rediscovered or never went out of fashion, but I found a boxed microphone bought by my dad for work in 1973 - a Grampian DP4/H and thought I'd give it a spin. The leaflet talks about frequency response, sensitivity, impedance and other things, but is very vague on directivity (although it does mention the word 'pressure'). I'd always thought they were omnidirectional, but then I spotted a little grommet hole on the side, and I wondered if this was a port - so instead of pressure operation (omni) it could be a pressure gradient (cardioid).
Clearly, the conclusion was it was omni, the vent seemed to do nothing and the sound was thin and unappealing, not the sort of mic I can imagine having a use for. Nostalgic, maybe, but not in the same league as the old STC (now Coles) or the Reslo ribbons.
Clearly, the conclusion was it was omni, the vent seemed to do nothing and the sound was thin and unappealing, not the sort of mic I can imagine having a use for. Nostalgic, maybe, but not in the same league as the old STC (now Coles) or the Reslo ribbons.