Features and Applications
Features
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Applications
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Product Details iK81
iK81 combines eight Class D amplifier channels, loudspeaker DSP and network control in a 2U rack chassis. Its applications include WPM line arrays and compatible multi-channel systems, including the published O-Line, XE300, TORUS 8 and FlexPoint configurations. The integrated platform is designed to provide both the amplifier power and processing required by the supported loudspeaker system.
Published output is 1250 W per channel into 2, 4 or 8 ohms with all channels driven, with up to 10,000 W total under the stated load conditions. The efficient Class D design reduces mains demand while maintaining the power reserve needed for demanding live programmes.
Ethernet connects the amplifier to VU-NET for remote control and monitoring. A front-panel interface also provides local control. Analogue, AES3 and Dante digital inputs are available, with AES67 compatibility on the network-audio input.
The integrated DSP supports the relevant loudspeaker presets and DISPLAY optimisation for WPM. Up to 1000 FIR taps at 48 kHz are available on each output. Normal DSP operation is at 96 kHz, with output processing at 48 kHz when FIR filtering is implemented.
Peak, RMS and excursion limiting protect the loudspeaker, with multiband limiting for passive two-way systems. Amplifier monitoring and protection maintain the operating conditions of the complete system. The switch-mode supply auto-senses the specified 85–240 V mains range.
Explore the Martin Audio amplification at B-Star for the available system options.
Technical Specifications iK81
AMPLIFICATION AND PERFORMANCE |
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| TYPE | Eight-channel Class D amplifier |
| POWER OUTPUT | 1250W into 2Ω 1250W into 4Ω 1250W into 8Ω 625W into 16Ω 2500W bridged per channel pair, 4Ω 2500W bridged per channel pair, 8Ω |
| CONSTANT-VOLTAGE LINE OUTPUT | 625W, 25V line; 1250W, 70V line; 1250W, 100V line |
| DYNAMIC RANGE | >113dBA, analogue input >114dBA AES/Dante™ input |
| FREQUENCY RESPONSE | 7Hz-30kHz (‐2.5dB points, 4Ω load) |
| TOTAL HARMONIC DISTORTION | <0.05% typical @ 1kHz, 4Ω load |
| SLEW RATE | >60V per microsecond |
| DAMPING FACTOR | >800 at amplifier output, ref 8Ω |
DIGITAL SIGNAL PROCESSING |
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| DIGITAL SIGNAL PROCESSING | 96kHz/48kHz DSP on all inputs and outputs |
| SAMPLE RATE | 96kHz (48kHz for FIR filter implementation) |
| DRIVE MODULE INPUT DSP | Input signal routing, delay, gain, HPF, Phase, Mute EQ: 2 x low shelf, 6 x PEQ/bandpass and FIR shelving filters |
| DRIVE MODULE OUTPUT DSP | Source, delay, gain, Phase, Mute, crossover filters, limiters EQ: low shelf, 8 x PEQ / band pass and shelving filters |
INPUTS, OUTPUTS AND CONTROL |
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| AUDIO INPUTS | 4 x analogue, 1 x AES pair with link output, 8 x Dante™ inputs (4 x inputs routable to 4 x input DSP, 4 x inputs routable to output DSP) |
| ANALOGUE IN/LINK (4 CHANNELS) | 4 x female 4 x male Neutrik™ XLR |
| ANALOGUE INPUT IMPEDANCE | 20kΩ balanced to ground |
| MAXIMUM ANALOGUE INPUT LEVEL | +20dBu |
| AES3 IN/LINK (2 CHANNELS) | 1 x female, 1 x male Neutrik™ XLR, balanced |
| DANTE (8 CHANNELS, AES67 COMPATIBLE) | 2 x shielded RJ45, primary and secondary |
| AMPLIFIER OUTPUTS | 4 x Neutrik Speakon™ NL4 |
| CONTROL PROTOCOL | Ethernet |
| CONTROL APPLICATION | Martin Audio VU-NET™ |
POWER SUPPLY AND COOLING |
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| COOLING | Dual variable-speed fans with front-to-back airflow |
| MAXIMUM AMBIENT TEMPERATURE | 40°C (104°F) |
| POWER SUPPLY TYPE | High-performance Series Resonant power supply |
| AC INPUT OPERATING RANGE | 85 – 240V ~ AC, 47 – 63Hz |
| MAINS INRUSH CURRENT | 6A at 115V, 12A at 230V (max for <10ms) |
| MAINS CONNECTOR | Neutrik 32A Powercon™ |
DIMENSIONS AND WEIGHT |
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| DIMENSIONS | (W) 482 x (H) 2U/88mm x (D) 441mm (W) 18.98in x (H) 2U/3.46in x (D) 17.35in (incl handles and optional rear support) |
| WEIGHT | 12.5kg (27.5lbs) |
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