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| OTEC-T | OTEC | Standard | |||
| Replacement type | Quad ESL 57 | Quad ESL 57 | Quad ESL 57 | ||
| Dimensions | 19 x 65 cm | 19 x 65 cm | 19 x 65 cm | ||
| Weight | 2.4 Kg | 2.6 Kg | 2.9 Kg | ||
| Electrode material | HDPVC | Fibreglass | Thermoplastics | ||
| Driven areas | Nickel coating | Copper-etched | Silver paint | ||
| Rear electrode | 2mm | 2 mm | 2 mm | ||
| Front electrode | 1mm | 0.5 mm | 2 mm | ||
| Terminations | Captive cable | Captive cable | Captive cable | ||
| Colour codes | blue, brown, red | blue, brown, red | blue, brown, red | ||
| Polarising voltage | 1.5kV +/- 12% | 1.5kV +/- 12% | 1.5 kV +/- 7% | ||
| Diaphragm material | P.E.T.P | P.E.T.P | P.E.T.P | ||
| Gauge | 5 microns | 5 microns | 6 microns | ||
| Coating | Carbon paint | Carbon paint | Carbon paint | ||
| Freq bandwidth | 600 Hz—15 kHz | 600 Hz—16 kHz | 600 Hz—15 kHz | ||
| Colour coding | Black/Dark Grey | Copper/green | Grey | ||
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