ISA 430 MkII Specifications
Line
| Gain Range | +10dB to +40dB continuously variable |
| Input Impedance | >1M Ohm |
Mic
| Gain Range | 0 to +60dB in 10dB steps |
| Input Impedance | Variable as follows: 600 Ohm, 1k4 Ohm, 2k4 Ohm, 6k8 Ohm |
| EIN | -128dB with 150 Ohm terminating impedance at 60dB of gain |
| Noise | -97dBu |
| THD | 0.001% with -20dBu 1kHz input and 20Hz-22kHz bandpass filter |
Compressor (VCA mode)
| Threshold Range | -28dB to +12dB |
| Ratio | 1.5:1 to 10:1 |
| Slope | Soft knee |
| Attack | 100µs to 100ms |
| Release | 100ms to 7s, variable or auto (program dependent) |
Compressor (Vintage Opto mode)
| Threshold Range | -28dB to +12dB |
| Slope | Soft knee in Comp mode, Hard knee in Lim mode |
| Attack | Fixed |
| Release | Fixed |
EQ
| Low Pass Filter | 18dB/oct from 400Hz to 22kHz |
| Parametric Section | Comprised of low-mid & Hi-mid parametric, each with continuously variable boost/cut with centre detent, frequency sweep control with two ranges, and fully variable Q. Low-mid frequencies 40Hz to 400Hz (120Hz to 1k2Hz when x3 is pressed). Hi-mid frequencies 600Hz to 6kHz (1k8Hz to 18kHz when x3 is pressed |
| Shelving section | Comprised of: high frequency shelf, with frequency range steps of 1.5kHz, 3.3kHz, 6.8kHz and 15kHz (2.2kHz, 4.7kHz, 10kHz and 18kHz when Hi Range is engaged), and low frequency shelf, with frequency range steps of 20Hz, 56Hz, 160Hz and 460Hz (33Hz, 95Hz, 270Hz and 655Hz when Hi Range switch is engaged) |
Gate
| Threshold Range | -40dB to +10dB |
| Gate Range | 0 to -80dB |
| Attack | switched fast or slow |
| Release | 100ms to 5s |
| Hold | 20ms to 4s |
| Expander Ratio | 0 to 5:1 |
De-Esser
| Threshold Range | 22dB |
| Frequency Range | 2k2 to 9k2 |
| Ratio at centre frequency | 2:1 |
Limiter
| Threshold Range | 20dB |
| Ratio | Infinite (Brick Wall) |
| Attack | Frequency Dependent |
Weight
| 7.58kg | 16.7lbs |
Dimensions
| 484mm (W) x 85mm (H) x 250mm (D) | 19" (W) x 3.5" (H) x 9.8" (D) |
Optional A-D Converter Specs
Output formats (All channels)
| AES/EBU (5V / 110 ohms), S/PDIF (0.8V / 75 ohms) |
| ADAT lightpipe (SMUX I/II/IV) |
| S/PDIF lightpipe |
Bit depth
| 24 bits |
AES3 output jitter
| <:500ps, 50Hz-100kHz |
| <:400ps, 700Hz-100kHz |
Frequency response
| All ranges | 20Hz–20kHz ± 0.3dB (50Hz–16kHz ± 0.1dB) |
| 176.4kHz, 192kHz : 16Hz–55kHz ± 0.5dB |
THD+n
| –117.5dB A-weighted, audio band-limited, 1kHz, -60dB FS input |
| Maximum 0.004% at –1dB FS (1kHz) |
| Minimum 0.0008% at –13dB FS (1kHz) |
Idle channel noise
| 113.5dB at 44.1kHz, CCIR-weighted, full bandwidth |
Crosstalk
| –109dB at 12kHz |