Hertz 8 Channel Digital Interface Audio Processor Overview
Hertz H8 DSP car audio processor is capable of interfacing with any analog and/or digital source, transforming ordinary “audio” into a high-performance integrated system. The simple and intuitive computer software ensures a wide array of adjustments to improve the acoustic response of a complex environment like the car compartment. It provides 7 signal inputs with a variety of connection options: four high-level inputs, also accepting low-level pre-amplified signals; a stereo auxiliary input and an optical digital input accepting signals at a sample rate up to 96/24 bit. The optical digital input (selectable through the DRC HE remote control and from the “Optical / AUX select” terminal) nullifies interferences and signal deteriorations also by-passing the analog signals A/D conversion stages. Thanks to the configuration Wizard provided by the software during the set-up, the H8 DSP can automatically sum up multiple filtered channels (for instance, woofer plus tweeter), “flatten” the OEM source equalized response curve and reconstruct a centre, rear and/or subwoofer channel with a simple stereo input. By reading the test track on the CD provided, the H8 DSP recreates a full-bandwidth signal, with a flat frequency response and released after processing for an outstanding sound quality. The H8 DSP features 8 PRE OUT analog outputs each of them including: a 31 band equalizer, a 68 step electronic crossover, Linkwitz- Riley or Butterworth filters with selectable 6 – 24 dB adjustable slopes and digital time delay functions.
AUDIO DSP AND CONVERTERS
32 bit Cirrus Logic (Clock speed: 147 MHz) Digital Signal Processing chip and A/D D/A converters working in PCM at 48 kHz with 24 bit resolution. The processor speed allows the user to hear and verify in real time the changes applied during the tuning.
4 independent high-level channels with automatic summing capability.
1 analog low-level stereo auxiliary input.
1 optical digital input.
8 independent analog PRE channels featuring adjustable level.
1 USB /B (2.0) connector for PC connection.
Optical In / Aux Wire control +12V/GND.
Wire control Memory A/B.
1 Connector for DRC HE.
Guided procedure which, thanks to a wide range of default settings, provides the abilityto assign each component to the H8 DSP connections and automatically coordinate their functions.
ART™, Automatic Remote Turn on/off, selectable from Hi-Level Front L.
The ART™ function can be enabled through an external switch, the Remote IN, the vehicle ignition key with memory function, the DRC HE (optional).
Manual input sensitivity adjustment for the Master Hi-Level inputs (with supplied Test CD).
Manual input sensitivity adjustment for auxiliary inputs.
Independent level control for each output channel for system fine tuning (-40 ÷ 0 dB).
Automatic de-equalization of the high-level inputs signal (with supplied Test CD)
if necessary. It can also be performed without the PC.
31-band graphic equalizer (1/3 Oct.; ±12dB) for each analog and digital output channel.
Filter typology: Hi-pass, Lo-pass, Full Range or Band-pass with independent selectable cut-off slope.
Cut-off frequency: 68 steps available from 20 Hz to 20 kHz.
Cut-off slope: 6 to 24 dB/Oct.
Filter alignment: Linkwitz or Butterworth.
Mute function: selectable for each output (on/off).
Phase: selectable for each output (0°/180°).
SIGNAL CHANNELS RECONSTRUCTION
It can reconstruct a stereo output signal from a multi-channel input signal.In addition it can also reconstruct rear, centre and subwoofer output channels from a stereo input.
Guided procedure for the speaker distance data entry with an automated calculation (distance to time) for each channel accurate time delays.“Fine-tuning” can also be manually applied (0.02 ms fine set).
Master Volume, Subwoofer Volume, Balance and Fader controls, Input selection, Memory selection.
2 presets separately managed and recalled via DRC HE and wire control.