Black Box AC470A User Manual

CUSTOMER

SUPPORT

INFORMATION

Order toll-free in the U.S. 24 hours, 7 A.M. Monday to midnight Friday: 877-877-BBOX
FREE technical support, 24 hours a day, 7 days a week: Call 724-746-5500 or fax [phone]
Mail order: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018
Web site: www.blackbox.com • E-mail: [e-mail]

OCTOBER 1994

AC470A

Internal Audio System

Internal Audio

System

MIN MAX

AMPLIFIER

DIRECT

CD

INPUT

SOUND BOARD

PC SPEAKER

MIN MAX

2

INTERNAL AUDIO SYSTEM

FEDERAL COMMUNICATIONS COMMISSION

AND INDUSTRY CANADA

RADIO FREQUENCY INTERFERENCE STATEMENT

Class B Digital Device. This equipment has been tested and found to comply
with the limits for a Class B computing device pursuant to Part 15 of the FCC
Rules. These limits are designed to provide reasonable protection against
harmful interference in a residential installation. However, there is no
guarantee that interference will not occur in a particular installation. This
equipment generates, uses, and can radiate radio frequency energy, and, if
not installed and used in accordance with the instructions, may cause harmful
interference to radio communications. If this equipment does cause harmful
interference to radio or telephone reception, which can be determined by
turning the equipment off and on, the user is encouraged to try to correct
the interference by one of the following measures:

• Reorient or relocate the receiving antenna.

• Increase the separation between the equipment and receiver.

• Connect the equipment into an outlet on a circuit different from
that to which the receiver is connected.

• Consult an experienced radio/TV technician for help.

Caution:

Changes or modifications not expressly approved by the party
responsible for compliance could void the user’s authority to operate the
equipment.

To meet FCC requirements, shielded cables and power cords are required
to connect this device to a personal computer or other Class B certified device.

This digital apparatus does not exceed the Class B limits for radio noise emission from
digital apparatus set out in the Radio Interference Regulation of Industry Canada.

Le présent appareil numérique n’émet pas de bruits radioélectriques dépassant les limites
applicables aux appareils numériques de la classe B prescrites dans le Règlement sur le brouillage
radioélectrique publié par Industrie Canada.

TRADEMARKS

Any other trademarks mentioned in this manual are acknowledged to be the property
of the trademark owners.

3

CHAPTER 1: Specifications

System Requirements — At least one available 51⁄4-inch standard disk bay

Speakers — 8-ohm stereo

Frequency Response — 250 Hz-20 KHz @ 83 dB with SPL

Magnetic Flux Density Leakage— <6 gauss (measured at enclosure)

Amplifiers — Built-in: -4W, 10W direct driven

Power — +12 VDC from the PC

Size — 1.7"H x 5.7"W x 7.9"D (4.3 x 14.5 x 20.1 cm)

Weight — 1.5 lb. (0.7 kg)

1. Specifications

WARNING!

Permanent or temporary hearing loss or impairment may result from
excessive amplification of the sound through the headphone jacks.
Before wearing any headphones, please hold them away from your ears
to prevent any injury from unexpected sound or static noise.

4

INTERNAL AUDIO SYSTEM

2.1 Features

Your new Internal Audio System transforms any PC into a high-quality audio
system. The Internal Audio System installs easily in any existing standard
51⁄4-inch disk bay. It’s packed with many convenient features:

• Two powerful, high-quality amplified stereo speakers.

• Engineered to be 100% safe for use in close proximity with all magnetic
devices.

• Compatible with all sound boards, CD-ROMs, CD digital audio players,
and MPC systems.

• Replaces your original PC speaker, giving you better frequency response
and volume control.

• Can be used with third-party sound boards to capture, display, and edit
audio waveforms.

• Convenient front-panel access to headphone output and microphone
or CD input jacks.

• Independent left/right volume controls.

• Direct Driven/Amplifier selection.

• PC Speaker/Sound Board selection.

2.2 Your Package Includes:

Unpack the Internal Audio System from its original shipping package
and check the contents. The package includes:

• (1) Internal Audio System unit.

• (1) Metal Bracket with (2) colored right-angle stereo cables attached.

• (2) 6-inch right-angle stereo cables.

• PC-Speaker Mono Cable.

• (4) Screws to anchor the Internal Audio System to your PC.

• This User’s Guide.

2. Introduction

5

CHAPTER 2: Introduction

2.3 Before You Get Started

Be sure to read Section 4, Installation, before proceeding with the actual
installation and operation of this unit.

For further information on proper operation, please read Section 5
Operating Modes. If you encounter problems while installing your Internal
Audio System in an older computer chassis, or to address other questions
you may have regarding installation, please call Black Box.

2.4 Calling Black Box

If the Internal Audio System malfunctions or the package arrives incom-plete,
do not attempt to alter or repair the unit. It contains no user-serviceable parts.
Contact Black Box. Before you do, make a record of the history of the
problem. Black Box will be able to provide more efficient and accurate
assistance if you have a complete description, including:

• The nature and duration of the problem.

• When the problem occurs.

• The components involved in the problem.

• Any particular application that, when used, appears to create the problem
or make it worse.

2.5 Shipping and Packaging the Unit

If you need to transport or ship your Internal Audio System:

• We recommend that you use the original packaging container.

• If you are returning the Internal Audio System, make sure you include
this manual as well. Before you ship, contact Black Box to get a
Return Materials Authorization (RMA) number.

2.6 Warnings

To avoid electrical shock, do not open the unit. Refer servicing to qualified
technicians only.

Permanent or temporary hearing loss or impairment may result from
excessive amplification of the sound through the earphone jacks. Before
wearing any headphones, please hold them away from your ears to prevent
any injury from unexpected sound or static noise.