Grampian GR1 & GR2
Manufacturer:
GrampianModel:
GR1 & GR2Country of Manufacture:
United KingdomMicrophone Type:
RibbonPolar Pattern:
Figure 8Production Start Year:
1963Production End Year:
1978Rarity:
2
Audio Recording:
Nylon string guitar recorded with a Grampian GRM ribbon microphone.
Multiple quality options available
Impulse Response File:
IR file of a Grampian GR ribbon microphone.
Grampian_GRx_IR.wav
Frequency Response:
Microphone History:
MoMics view:
The Grampian GR1 and GR2 models were made between 1963 and 1978*, and are essentially the same microphone except that the GR 1 has some additional foam and paper padding to reduce sensitivity in the rear to give it a slightly uni-directional performance. The bi-directional GR2 model sounds very good. Both models were available in four different impedances at 30, 200, 600 ohms and high impedance (~50,000 ohms). These were identified by different coloured labels:
GR2/L: 30/50 ohms. Red label
GR2/X: 200 ohms, White label (?)
GR2/M: 600 ohms. Blue label
GR2/H: High impedance. Green label.
All these microphones used a custom output connector which is now obsolete and hard to find.
* Dates are based on their appearance in Hi-Fi Yearbook.
Technical Description:
From Hi-Fi Yearbook 1966
GR1. Ribbon. Unequal figure of eight.
Response: 40 Hz- 15 KHz.
Sensitivity - 90 dB (25 ohms), - 81 dB (200 ohms), - 76 dB (600 ohms), - 58 dB (50K).
Imp. 25, 200, 600 ohms, 50K. Built-in transformer.
Easily replaceable ribbon. Price (including lead, swivel holder, case) : £11. 15s.
GR2. Details as for GR1, but equal figure of eight response.
