Product Description

The USB Matchbox Plus is a professional USB-to-XLR bi-directional stereo audio codec and monitor. It provides unparalleled audio performance and the facilities to critically monitor the audio both audibly and visually. The USB Match Plus provides USB connectivity in any application where digital audio from a computer needs to interface with a professional analog audio system. The unit is USB powered, and solves the myriad of problems caused by using common computer sound cards in broadcast and professional audio environments.

The Sound Card Problem

Using a PC sound card to interface with a professional audio system usually leads to numerous problems. The inputs and outputs are often at the wrong levels. The unbalanced interface creates ground loops that cause hum and buzz. The "EMI hurricane" within the PC case creates even more noise, and the sound card audio quality is usually sub-par, (despite exaggerated claims) with pedestrian design and poor component quality. Although these shortcomings may be accepted by a non-technical user, they have no place in a broadcast station or professional audio installation.

The USB Solution

Henry Engineering's USB Match Plus has been designed "from the ground up" as a true professional product that solves all of these problems. It delivers impeccable audio quality, accurate monitoring facilities, XLR connectivity, and the convenience of a simple USB interface to the computer.

The heart of the USB Match Plus is Burr Brow's Delta Sigma 8X Oversampled codec with SpAct audio clock recovery architecture. The codec's superb performance is further enhanced with Henry Engineering's proprietary L/C pre-filtering and edge-of-the-art analog circuitry painstakingly designed by Bill Sacks, founder of Straight Wire Audio. This carefully tuned design eliminates the transient intermodulation products caused by inadequate reconstruction filters found in even high-end sound cards. Careful attention to component selection and circuit board layout further enhance the servo-coupled design to yield true Audiophile performance: ultra smooth, open and transparent "un-digital" audio with accurate, well-defined bass and crystal-clear highs.

In addition, the units internal switch-mode power system virtually eliminates ground loops through the PC, and allows operation at true professional levels with liberal headroom. The net result is obvious with a simple listening test: the USB Match Plus will sonically outperform any soundcard and even surpass the quality of many 24 bit systems. MS-Windows and Linux OS are supported; no special driver or software is needed. The USB Match Plus will operate with virtually any audio editing, recording, or broadcast automation software at sample rates up to 48 kHz and up to 16 bit resolution.

For The Professional

TheUSB Match Plus provides the functionality that professional users require. Its dual-PLL asynchronous design permits simultaneous record and playback. Input and output levels are monitored using extended range LED meters which accurately indicate headroom relative to digital full-scale. The servo-coupled reference-quality headphone amplifier allows critical aural monitoring with unsurpassed detail and resolution. Front panel controls allow precise adjustment of input Level and L/R Balance trim. Output levels are calibrated with recessed trimmers. Rear panel connections include XLRs for balanced analog I/O, Auxiliary unbalanced line inputs, and outputs for amplified speakers. The Speaker output can be muted with an external contact closure via the Mute jack. The steel chassis provides effective RF and EMI shielding. All ICs that connect to the "outside world" are mounted in sockets.

The USB Match Plus is 1/3 rack width, and can be rack-mounted using the optional rack-mount shelf, or cabinet or wall mounted using optional cabinet/wall mounting brackets. Also available: USB Matchbox: Identical to the USB Match Plus, but without the level meters and headphone amplifier.

Technical Specifications
XLR Analog Inputs X2 Balanced, 10K input imped. -6 to +8 dBu nom. input level
RCA Analog Inputs X2 Unbal, 10K input imped. -10 dBv nom. input level
XLR Analog Output X2 Balanced, 600 ohm load or higher +4 dBu nom, +24 dBu max. level
SPKR Output -10 dBv, 3.5mm stereo jack
MUTE GPI closure to mute SPKR
USB Compliance USB 1.1 or higher
Sample Rates 32, 44.1, 48 kHz
Bit Depth 16-Bit Delta-Sigma ADC and DAC
O/S supported MS-Windows, Linux
Power USB Powered
Physical 5.7" w x 1.7"h x 6.0"d 3 lbs


Technical specifications subject to change without notice.

503 Key Vista Drive
Sierra Madre, CA 91024 USA
TEL (626) 355—3656
FAX (626) 355—0077
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