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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
TM
5
5
4
4
3
3
2
D
C
B
A
BLK
WHT
GROUND TIE
AC
AC
230V
115V
PRI SEC
USB
IN L
REC L
REC R
PLA
PLA
PHONE
LEVEL
230V:125ma
AES OUT
IN R
-15V
+15V
+15V
-15V
-15V
+15V
+15V
-15V
+15V
-15V
R6 200
J3
NC3FAH2
1
2
3
C9
.1uF
J2
NC3FAH2
1
2
3
+
C12
1000uF 35V
VR2
1K 40%
1 3
2
C16
.01uF
R9
4.99K
E8
E1
Q2 LM7915
2 3
1
IN OUT
GND
J7
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
D3
1N4004
T2
TC-615
1 3
2 4
R12 10.0K
+
C11
1000uF 35V TP3
1
1K
R29
200
J6
NC3MAH
1
2
3
TP2
1
E9
C3
.001uF
E2
R3 4.99K
C20
.1uF
LED1 LED
C5
.001uF
J1
1
2
3
4
VR3
1K 40%
1 3
2
C2
.001uF
TP1
1
R10 4.99K
E4
C6 30pF
+
-
U1A
NE5532
3
21
8 4
E5
R7 200
D2
1N4004
E6
R4
4.99K
F1
115V: 250 ma;
R11 10.0K
T1
SPW-061
1
3
4
2
5
6
8
7
R2 10.0K
R30 2.4K
R1 10.0K
R31
110, 1/4W
D4
1N4004
R21
3.9K, 5%
C19
.1uF
Q1 LM7815
3
2
1
IN
GND
OUT
-
+
U5
LM6181
3
26
7 4
C4
.001uF
+
-
U1B
NE5532
5
67
8 4
E7 D1
1N4004
1K

Produktspecifikationer

Varumärke: Henry Engineering
Kategori: Inte kategoriserad
Modell: USB Matchbox II

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