HENRY ENGINEERING
503 Key Vista Drive
Sierra Madre, CA 91024
Tel: 626.355.3656
Fax: 626.355.0077
www.henryeng.com
TWINMATCH
TM
IHF>PRO DUAL STEREO INTERFACE
DESCRIPTION
TWINMATCH is a level and impedance converter designed to interface consumer or "semi-professional"
equipment to professional studio gear. TwinMatch converts the outputs of unbalanced “IHF” (-10 dBv)
equipment to balanced Lo-Z lines at +4 dBm. Four channels of interface permit operation with a pair of
stereo audio sources, eg, two stereo CD players or R-DAT decks. All circuitry is active and direct coupled
for exceptional sonic accuracy.
INSTALLATION
Connect the unbalanced source(s) to the TwinMatch inputs via the RCA jacks on the rear panel. There
are two stereo inputs, labeled "1" and "2". Each stereo input has a Left and Right input jack.
The TwinMatch balanced outputs are via the male XLR connectors on the rear panel. The mating XLR
connectors should be wired as follows:
Pin 1 = Ground
Pin 2 = Signal HI
Pin 3 = Signal LO
Note: To drive an unbalanced load, connect to pins 1 and 2 ONLY. Do NOT short pin 3 to ground!
The TwinMatch will drive any load of 600 ohms or higher. It is not necessary to terminate the outputs.
ADJUSTMENT
Each channel of the TwinMatch has a gain adjustment. It is set at the factory for a gain of 14 db, so that
a –10 dBv input will produce an output of +4 dBm. The gains may be changed via the trimpots on the
front panel. The gain range is from +6 to +20 dB.
SPECIFICATIONS
INPUT LEVEL
-10 dBv nominal
INPUT IMPED
25k ohms, unbalanced
GAIN +6 to +20 dB
OUTPUT LEVEL +4 dBm nominal, +26 dBm max
OUTPUT LOAD 600 ohms or higher per channel
FREQ RESPONSE DC to 20 kHz, +/- 0.25 dB
NOISE LEVEL 85 dB below +4 dBm output
DISTORTION .008% IM/THD
Specification subject to change without notice.
Rev. 9/03
