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Digital playback of artificial head recordings
The digital 24 bit playback system complements the artificial head recording system HMS III. The processing of the audio data for aurally-accurate playback is instituted through the equalization of the acoustic signal in a programmable equalizer PEQ V (PEQ IV.1) and through the subsequent amplification in the power amplifier PVA IV.3. In the stand-alone operating mode, a dynamic headphone (HD IV.1), or a choice of distribution amplifiers (HDA IV) to power up to four or eight pairs of dynamic headphones, can be connected to the analogue output of the PEQ V. Optionally, two electrostatic headphones can be connected in combination with the Power Amplifier PVA IV.3, and are individually calibrated and powered accordingly. The playback system ensures the authentic reproduction of 24 bit recordings with artificial heads of the HMS III generation and is compatible to 16 bit artificial head recordings. It achieves the utmost in spatial representation of the recorded acoustic events during the aurally-accurate playback.

Programmable Equalizer PEQ IV
The programmable equaliser PEQ V plays back aurally accurate recordings in the highest possible quality. Two headphone outputs suitable for the direct connection of dynamic headphones (HD IV.1) can be calibrated independently of each other.
Both data transmission and remote control are conveniently handled via one single cable: The PEQ V is connected directly to a notebook or PC via USB (USB 2.0 full speed). No additional digital sound card is required.
Furthermore, the user-firendly PEQ V is equipped with all common interfaces (ADAT, S?PDIF, AES/EBU, line, pulse), of which, for example, the optical ADAT interface allows up to four PEQ's to be connected simultaneously for multi-channel playback. Artificial heads and other frontends, devices with optical outputs and analogue power amplifiers can be connected directly to the PEQ V.
The PEQ V is equally well suited for stationary and mobile operation: It can be powered by a car battery as well as by its external power adapter.
With supported sampling rates of up to 96 kHz, the PEQ V is already prepared for future applications.
For loudspeaker playback, active loudspeakers can be connected as well. AS a universal equaliser, the PEQ V can also be used for the playback of conventional recordings.

Power Amplifier PVA IV.2
PVA IV.2 is a transformerless power amplifier with an input amplifier upstream. The HPS IV amplifier system operates as a Class A device and allows connection of two electrostatic HEADphones HA II.1. The two headphones are individually calibrated and correspondingly driven by the amplifier.

Playback with several headphones
Playback using more than two headphones is possible by cascading several playback systems with no loss in quality. It is possible to connect Power Amplifiers PVA IV.2 only, or Equalizers PEQ IV with power amplifier in series. When cascading several PEQ IV units, the equalization for each pair of headphones can be selected individually. 

Electrostatic HEADphone HA II.1
The open design of this headphone allows perfectly authentic playback of acoustic events. The extra thin gold-vapourized polymer foil diaphragm responds to the slightest changes in audio frequency signal voltage, helping HA II.1 achieve an outstanding precision and transparency. HA II.1 is notable for its rugged mechanical properties, combined with high-level user comfort.

Monitor Loudspeaker HML
HML is a self-contained two-way-monitor system, suitable for playing back artificial head recordings. The loudspeaker provides an accurate sound impression even at low volumes and has convincingly low radiation. The special calibration of optimized filter combinations provides the precise tuning of the individual HML in the frequency and phase response. The system’s complementary power MOSFET output stages operate class A at low-to-moderate levels (up to 90 dB) and only at higher levels class AB.

Features 

PEQ V  True to original playback of aurally accurate recordings in highest quality Two independently calibratable headphone outputs for dynamic headphones (HD IV.1) USB interface (USB 2.0, full speed) for direct connection to a notebook or PC - without additional sound card AES/EBU input and output Optical interface (ADAT/S/PDIF) Line out, symmetrical Two pulse outputs (electrically isolated) Sampling rate: 32, 44.1, 48 and 96kHz Equalisations: LIN, ID, FF, DF, USER Convenient, intuitive turning knob for menu-based control User-friendly software-based control (via USB) or hand remote control unit Cascadable (ADAT, S?PDIF, AES/EBU)

PVA IV.3  Low inherent noise  Large dynamic range  Low distortion even at low frequencies  Long transmission range  Outputs for cascading a series of power voltage amplifiers  HA II.1  Electrostatic headphone  High dynamic range  Extensive transmission range  Minimal interaural level and phase differences  Authentic playback  High precision, also at low frequency  Low-capacitance OFC cable adapted to Amplifier System HPS IV  Excellent user comfort through velour ear cushions and gimballed phones  HML  Self-contained, near-field monitor  Self-powered, biamplified system  Optimized spatial reproduction by combining two HML  Electronically corrected (amplitude and phase)  Magnetic leakage minimalized using field cancelling magnet  Loudspeaker element protective circuitry

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