Henry Engineering USB Matchbox II Manual

Henry Engineering Ikke kategoriseret USB Matchbox II

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USB MATCHBOX II

USB<>XLR MULTIMODE DIGITAL AUDIO CODEC

DESCRIPTION

The USB Matchbox II is a high-performance professional audio codec. Used in place of a computer “sound card”, it

provides stereo analog inputs and outputs at professional studio levels, an AES/EBU output, and a Headphone

output for critical monitoring. The USB Matchbox II yields superb “audiophile” performance with the convenience of

USB interface to any Windows, Mac, or Linux based computer. The USB Matchbox II is compatible with virtually

any audio recording/editing software that supports a USB sound device. No special software or driver is needed.

A USB 1.1 (or higher) connection to th the AES-48-2005 the PC is required. The USB Matchbox II complies wi

grounding standard.

INSTALLATION

ANALOG LINE INPUTS/OUTPUTS: Connect balanced analog inputs and output to the XLR connectors as follows:

Pin 1 = GND, Pin 2 = HI, Pin 3 = LOW.

NOTE: Ground loops cause hum, buzz, and other noises that are created by the computer mouse, drives, fan, and

keyboard. Prevent noise by connecting ground wires at one end only.

The HEADPHONE output can be used to monitor the “play” output of the system. Use contemporary headphones

with an impedance of 24 ohms or greater. Do NOT use older “8 ohm” headphones. The VOLUME control adjusts

the headphone level. Warning! Excessive listening levels can cause permanent hearing damage.

DIGITAL OUTPUT: Connect to the AES/EBU digital output XLR connector as follows:

Pin 1 = GND, Pin 2 = HI, Pin 3 = LOW. (The AES/EBU output is transformer isolated.)

COMPUTER CONNECTION:

First, close any audio-related programs. Use a USB cable to connect the USB Matchbox II to any USB port on the

PC. The computer should recognize the USB Matchbox II as “ No additional software or USB Audio Codec”.

drivers are needed. When audio software is started, it may be necessary to change its Settings to select the

USB Audio Codec as its default.

WINDOWS* VOLUME SETTING

BEFORE USING USB MATCHBOX II

, be sure to check the Windows “SPEAKER VOLUME” setting. The Speaker

Volume can be accessed via the Windows Control Panel under “Sound and audio devices” or “Adjust the system

volume”. Select “Volume” or “Set system volume”, then adjust the slider. In most cases, the Speaker Volume

should be set to MAXIMUM.

*Windows is a registered trademark of Microsoft Corporation.

OUTPUT LEVEL CALIBRATION

The USB Matchbox II is calibrated to operate with analog I/O levels of +4 dBu. Input and Output levels can be

changed via the recessed trimmers; use a small screwdriver to carefully adjust. NOTE: There is 15 dB of digital

headroom above +4 dBu: a calibration tone recorded at 0 dBfs will produce an output level of about +19 dBu.

OPERATION

To record, feed audio into the unit. Set the INPUT LEVEL trimmers as necessary, as indicated by the software

being used. To play a recording, simply play the file. Audio will be present on the XLR analog outputs, Headphone

jack, and on the AES/EBU digital output. (The Headphone output monitors “playback” audio only.)

SPECIFICATIONS

Balanced analog inputs Stereo, nom. +4 dBu @ -15 dBfs, 20K ohms input impedance, XLR X 2

Balanced analog outputs Stereo, nom. +4 dBu @ -15 dBfs, +24 dBu max level, 600 ohms, XLR X 2

AES/EBU digital output Transformer isolated, 110 ohms, XLR connector

Headphones output For headphones, 24 ohms or higher; 3.5mm stereo jack

Sample rates supported 48, 44.1, or 32 kHz, software defined

Resolution, dynamic range 16 bit stereo or mono, software defined

USB supported USB 1.1 or higher

Power Input 115 or 230 VAC, 50-60 Hz, 2W, + USB power

Approval City of Los Angeles Electrical Test Lab

Physical 5.75” w X 5.50”d X 1.60”h, 3 LBS

Construction Steel enclosure

HENRY ENGINEERING

503 Key Vista Drive

Sierra Madre, CA 91024

Tel: 626.355.3656

Fax: 626.355.0077

www.henryeng.com

BLK

WHT

GROUND TIE

230V

115V

PRI SEC

USB

IN L

REC L

REC R

PLA

PHONE

LEVEL

230V:125ma

AES OUT

IN R

-15V

+15V

-15V

+15V

-15V

+15V

-15V

R6 200

NC3FAH2

.1uF

NC3FAH2

C12

1000uF 35V

VR2

1K 40%

1 3

C16

.01uF

4.99K

Q2 LM7915

2 3

IN OUT

GND

1 2

3 4

5 6

7 8

9 10

11 12

13 14

15 16

17 18

19 20

21 22

23 24

25 26

27 28

29 30

31 32

33 34

35 36

37 38

39 40

1N4004

TC-615

1 3

2 4

R12 10.0K

C11

1000uF 35V

TP3

R29

200

NC3MAH

TP2

.001uF

R3 4.99K

C20

.1uF

LED1 LED

.001uF

VR3

1K 40%

1 3

.001uF

TP1

R10 4.99K

U1A

NE5532

8 4

R7 200

1N4004

4.99K

115V: 250 ma;

R11 10.0K

SPW-061

R2 10.0K

R30 2.4K

R1 10.0K

R31

110, 1/4W

1N4004

R21

3.9K, 5%

C19

.1uF

Q1 LM7815

GND

OUT

LM6181

7 4

.001uF

U1B

NE5532

8 4

1N4004

Produkt Specifikationer

Mærke:	Henry Engineering
Kategori:	Ikke kategoriseret
Model:	USB Matchbox II

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