Gotham GAC-3
3 conductor Balanced Mic Cable
Why three conductors for an audio signal? Here are some answers:
Grounding/shielding
With the third conductor put to ground, together with the two shields, we have increased RF-rejection to 115dB (20dB better than standard) at 25 kHz. This fact has also been conformed at the AES-paper held by Mr Neil A. Muncy ("Noise Susceptibility in Analog + Digital Signal Processing Systems") in November 1994. The GAC-3 was named the best performing microphone cable available
Round Construction
3-conductor constructions are round constructions, and since the cable has the freedom to move in all directions, especially on the strain relief of a connector, the cable will survive more movement cycles
Phantom Power
The 3rd conductor can be wired as a drain wire for a reliable connection of phantom power to the microphone without affecting the shield. Each of the three conductors consists of 96 (!!) strands of 0.05mm copper wires being the finest stranding for audio cables available which gives you improved flexibility, better signal transport and longer lifetime (moving cycles)
Black Jacket Only
| Construction: | ||
| 1 = Jacket: | PVC, Ø 5.0mm, (10701-10716) PVC, Ø 5.8mm, (10801-10803) | |
| 2 = Shield No. 1: | Bare copper wires (0.10 mm) 100% coverage | |
| 3 = Shield No. 2: | Bare copper wires (0.10 mm) 100% coverage | |
| 4 = Viscose fiber coat: | Counter wrapped to the twisted triple | |
| 5 = Insulation (cond): | PVC, Ø 1.2 mm, white, brown and green, twisted triple | |
| 6 = Conductor: | Stranded bare copper wires 96 x 0.05 mm (0.20mm²) | |
LFOC higher grade copper at best standards for best performance. Technical specifications: | ||
| Conductor resistance: | < 95 Ohm/km | |
| Shielding resistance: | < 20 Ohm/km | |
| Capacitance: | cond/cond: | <150 nF/km |
| cond/shield: | <240 nF/km | |
| Characteristic impedance: | at 10 kHz: | 150 ohm |
| Test voltage: | cond/cond: | 500 veff |
| cond/shield: | 2000 veff | |
| Operating voltage | low voltage | |
| Temperature range: | flexi-installed: | -5° to +50° C |
| fix-installed: | -30° to +70° C | |