8288988000 (565643) Owner’s Manual HP-A4 2-ch DAC & Headphone Amplifier : If you connect the HP-A4 to a Windows computer via USB, you must install the dedicated USB Audio Class 2.0 driver which can be downloaded from the Fostex website (www.fostex.com). If you use a Mac computer, you do not need to download a driver.
The lightning flash with arrowhead symbol, within an equilateral triangle, is intended to alert the user to the presence of uninsulated “dangerous voltage” within the product’s enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons. CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE COVER (OR BACK). NO USER - SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
Table of contents Overview Safety instructions. . . . . . . . . . . . . . . . . E-2 FCC (U.S.A.) & ICES-003 (Canada) Information . . . . . . . . . . E-2 Table of contents. . . . . . . . . . . . . . . . . . E-3 Introduction. . . . . . . . . . . . . . . . . . . . . . E-3 Overview. . . . . . . . . . . . . . . . . . . . . . . . E-3 Supplied accessories . . . . . . . . . . . . . . E-3 About power supply . . . . . . . . . . . . . . . E-3 Maintenance. . . . . . . . . . . . . . . . . . . . .
Names and functions ❹ [DSD] indicator Front panel ❶ ❷ ❸ ❹ ❺ This indicator is illuminated in green when the unit plays back DSD audio. ❺ Volume control knob Adjusts the analog output level of [PHONES] and [OUTPUT] connectors. (See “HP-A4 settings” on page E-8.) ❻ ❼ ❽ ❻ [INPUT SEL] switch ❾ Selects the digital input source between the [USB] and [DIGITAL IN] connectors. (See “HP-A4 settings” on page E-8.
Names and functions ⓭ [USB] connector Front panel ❿ ⓫ ⓬ ⓭ When you play back USB audio, connect a computer to this connector using the supplied USB cable . When you play back audio received from the [DIGITAL IN] connector, connect a device that can supply USB bus power (such as a computer, USB mobile power supply, etc.) to this connector. ⓮ : • To get stable power supply, directly connect the USB cable without using a USB hub.
Computer connection and settings When you use a computer as the input source of the unit, you need to make the following preparations. Connecting a computer Connect the HP-A4 to your computer using the supplied USB cable. After making connection, the computer recognizes the unit and the [POWER] indicator of the unit is lit in red showing that the USB bus power is supplied to the unit. Computer requirements You can connect a computer that satisfies the following requirements. • A USB 2.
Computer connection and settings 2) Select “Sound” to open the “Sound” window and select “Output” tab at the top of the window. Detail settings for sound By making sound output settings on a computer appropriately, you may be able to monitor the sound better. Depending on a computer OS, the setting window differs. The following briefly introduces the setting window for each OS. See the computer manual or help screen for details.
HP-A4 settings [INPUT SEL] switch setting [OUTPUT SEL] switch setting This switch selects the audio input source. At the down (“USB”) position, the unit plays back a USB audio signal from a USB-connected computer. At the up (“OPT”) position, the unit plays back a signal from the [DIGITAL IN] connector. This switch selects the analog output destination between the [PHONES] and [OUTPUT] connectors.
Connection example Audio amplifier Headphones CD player AV amplifier Computer :When a PCM source is input, the [DIGITAL OUT] connector directly outputs the input signal. * When a DSD source is input, no signal is output from the [DIGITAL OUT] connector. Specifications • [DIGITAL OUT] connector • Connector type: TOSLINK optical • Format: S/PDIF • Supporting sampling frequency: 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz, 176.
Declaration of EC Directive This equipment is compatible with the EMC Directive (2004/108/EC) - Directive on approximation of member nation's ordinance concerning the electromagnetic compatibility and with the Low Voltage Directive (73/23/EEC) - Directive on approximation of member nation's ordinance concerning electric equipment designed to be used within the specified voltage range.
