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General| Type | Headphone Amplifier |
|---|---|
| Input Impedance | 10 kOhms |
| THD+N | -100 dB @ 1 kHz |
| Inputs | Balanced and unbalanced |
| Outputs | Balanced and unbalanced |
| Output Impedance | < 0.1 Ohm |
| Channel Separation | > 80 dB |
| Power Consumption | 30 W |
Details on the development of Violectric equipment by Lake People electronic GmbH engineers.
Information about the manufacturing of Violectric devices in Germany by Lake People.
Explains the distribution channels and availability of Violectric devices through specialist suppliers.
Covers warranty terms, shipping for repairs, and ongoing technical support availability.
Specific warnings regarding UK mains plugs, fuse replacement, and safety precautions.
Explanation of the general ground-lift jumper's function and ex-works position.
Description of the HPA V281's case material, ensuring mechanical stability and resistance.
Details on the unit's grounding concept and how internal reference ground is set.
Information on mains power connection, voltage settings, and toroidal transformers.
How to operate the power switch and understand its status indications.
Details on the balanced signal inputs, including XLR connector pin-out.
Information on unbalanced inputs using RCA sockets and their impedance and level specifications.
Overview of various optional digital input types (Coax, Opto, USB) and their capabilities.
How to adjust volume via the unit's control knob and remote control.
How to use the balance control to compensate for level differences between channels.
How to activate or deactivate headphone outputs using the front panel button or remote.
Details on the balanced headphone output with a 4-pin XLR connector and its pin-out.
Information on the unbalanced headphone outputs with 1/4" (6.3mm) jack sockets.
Description of the balanced line outputs, their XLR connectors, and wiring for unbalanced use.
Details on the unbalanced line outputs using gold-plated premium RCA connectors.
How to activate or deactivate line outputs using the front panel button or remote control.
Explanation of tapping the line-out signal at pre-fader (fixed) or post-fader (variable) points.
How to switch line output mode between pre- and post-fader using software.
How to set the line output level using internal DIP switches for attenuation or gain.
Description of the mute function that silences all outputs, activated via remote control.
Information on protection circuits and error detection for headphone safety.
Procedure for resetting all software-based settings to factory defaults.
Explains the extensive effort required to design an amplifier for diverse headphone requirements.
Details the benefits of balanced signals for audio transmission, including noise rejection.
Discusses the advantages of discrete signal paths over integrated twin op-amps for channel separation.
Explains why op-amps are ideal for low-level signal processing in preamplifier stages.
Details the purpose and advantages of the PRE-GAIN feature for input signal adjustment.
Explains the rationale behind limiting frequency bandwidth for optimal audio signal transmission.
Highlights the significance of a quality volume potentiometer over electronic alternatives.
Explains the importance of low output impedance for effective headphone driver response.
Discusses the necessity of high supply voltages for achieving greater output voltage swing.
Explains the function of relays in power switching for headphone protection.
Provides an overview of the different digital input options available for the V281 unit.
Information on which USB devices can be connected to the HPA V281.
Step-by-step instructions for safely dismantling the HPA V281 unit.
Illustration and explanation of jumper settings on the main PCB.
Illustration and explanation of jumper settings on the line-out PCB.
Details on setting phone jacks for balanced operation and ex-works configuration.
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