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Loudspeaker Management System HD2
For crystal clear audio from your loudspeaker system, Four Audio provides a loudspeaker management system with yet unheard audio performance, freely combinable IIR and FIR equalization and separate precision peak and RMS limiters in each output.
Download our flyer for an overview here
The HD2 is also available as a module to be mounted inside speaker cabinets or self-designed housings. Just provide voltage supply and in- and output jacks. As well as the HD2 devices, the modules are remote controllable by Ethernet. PCB sizes are 11 × 13 cm (4 outputs) or 20 × 13 cm (8 outputs).
Features
- 96 kHz / 48 bit processing
- ADC inputs configurable to provide 4 normal or 2 dual range inputs with extended dynamic range
- 1 AES/EBU digital input
- 1 I²S I/O provides an interface to Cobranet, Ethersound, ADAT, etc.
- Sample rate converter for input rates <> 96 kHz
- 8 analog outputs
- 1 AES/EBU digital output
- Configurable and programmable via Ethernet and RS232 interface
- Windows remote software provided
Optional hardware extensions
- AES/EBU extension for additional 8 channel digital I/O
- ADAT extension for 8 channel digital I/O
Signal Processing
- IIR filters: up to 96 fully parametric high precision filters freely configurable
- IIR crossover filters with 6-60 dB/octave
- FIR filters: 1 provided for each output channel
- Mixed linear and minimum phase equalization possible
- Max. frequency resolution: 3 Hz
- Separate limiter thresholds for amps (peak and RMS) and loudspeakers (peak and temp.)
- Interface to Monkey Forest for FIR filter and limiter calculation
Audio Performance
| Max. input level | +28, +21, or +15 dBu (selectable) |
| Max. output level | +18 dBu |
| Frequency response (-0.5 dB) | 4 up to 45 kHz |
| Dynamic ranges | |
| ADC | > 130 dB (dual range mode) 118 dB (single range mode) |
| DAC | 121 dB |
| Overall | 121 dB (dual range mode) |
| THD (1 kHz) | |
| ADC | -113 dB (+4 dBu) -105 dB (0 dBFS) |
| DAC | -110 dB (+4 dBu) -102 dB (+18 dBu) |
| All values ref. 20 Hz – 20 kHz, linear weighting | |
Measurement plots
The following plots are taken from a PDF containing audio perfomance measurements executed with a UPD (Rohde + Schwarz). Click on the images to enlarge them.
You can download the PDF here
