Henry Engineering USB MATCHBOX - Manual (Page 2)

This product uses THAT Corporation’s InGenius* high performance differential analog input circuitry.
The InGenius balanced line receiver ICs used within provide exceptional common-mode noise rejection. The input
circuitry will reject common-mode noise regardless of the symmetry or impedance balance of the source. This very
high CMRR performance remains consistent over a wide range of input frequency, level, and source impedance.
This product is suitable in installations where the balanced analog input cables are very long and/or are exposed to
external noise sources, e.g., other electrical equipment or cabling.
*InGenius is a registered trademark of THAT Corporation.
THIS DEVICE COMPLIES WITH THE AES-48-2005 GROUNDING STANDARD.
Exceptional care has been taken to provide excellent RF rejection, especially in the VHF/UHF spectrum. Pin 1 of
the XLR connectors is connected to the chassis through a direct path that represents a very low impedance at RF
frequencies. The GND screw on the chassis may be used to connect the unit to system ground or RF ground.
USING THE UNBALANCED ‘AUX IN’ INPUTS
The AUX INputs (RCA jacks) are actually balanced inputs, and are intended for use with battery-operated devices
that are isolated from the AC powerline. The reason for this design is to preserve compliance with the AES-48
grounding standard, which does not address “consumer” unbalanced source equipment. The AUX IN inputs CAN
be used with ground-referenced (AC powered) equipment, however, hum may result due to ground loops. If this
occurs, connecting a short wire from the shield (shell) of the RCA jack to the GND screw on the chassis will usually
eliminate the hum.
FCC COMPLIANCE NOTICE
The equipment described in this manual generates and may radiate radio-frequency energy. If it is not installed in
accordance with installation instructions, it may cause interference with radio and television reception. This
equipment has been tested and found to comply with the limits for a Class B digital device in accordance with the
specifications in part 15 of the FCC rules. These specifications are designed to provide reasonable protection
against such interference in a residential installation. However, there is no guarantee that interference will not occur
in a particular installation.
Modifying the equipment without Henry Engineering's written authorization may result in the equipment no longer
complying with FCC requirements for Class A or Class B digital devices. In that event, your right to use the
equipment may be limited by FCC regulations, and you may be required to correct any interference to radio or
television communications at your own expense.
You can determine whether your equipment is causing interference by turning it off. If the interference stops, it was
probably caused by the Henry Engineering equipment or one of its peripheral devices. If the equipment causes
interference to radio or television reception, try to correct the interference by using one or more of the following
measures:
· Turn the television or radio antenna until the interference stops.
· Move the equipment to one side or the other of the television or radio.
· Move the equipment farther away from the television or radio.
· Plug the equipment into an outlet that is on a different circuit from the television or radio. (Make certain the
equipment and the television or radio are on circuits controlled by different circuit breakers or fuses.)
Modifications to this product not authorized by Henry Engineering could void the FCC approval and negate your
authority to operate the product.