ATI DMM104 User Manual

ATI Audio Inc. ■ Tel: [phone] ■ Fax: [phone] ■ [e-mail] ■ www.

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DMM100 & DMM100-BAT

Digital Audio MatchMaker®

DMM104 & DMM104-BAT

1X5 Digital Audio Distribution Amplifier

OPERATING AND MAINTENANCE MANUAL

© Copyright 2011, ATI Audio Inc.

ATI Audio Inc. ■ Tel: [phone] ■ Fax: [phone] ■ [e-mail] ■ www.

audio.com

DESCRIPTION

The DMM100 is a level, impedance and connector matcher for AES/EBU digital
audio signals. AES/EBU digital signals share the same general data format
regardless of the mode of transmission. A consumer device is most likely to
output an S/PDIF signal in which a few bits of the data stream indicate whether
the signal source is an original or a first generation copy in order to control
unauthorized large scale duplication. A professional device may indicate whether
the encoded audio is a stereo signal or two monaural channels. The DMM100
doesn’t care about any of these details and just outputs a clean copy of the
original data stream to the smart boxes that do.

You may find it necessary to run a low level RCA type (S/PDIF) digital output
over a long distance in a high noise environment where a balanced XLR high­level connection would be a better choice. Or you may run that high level XLR
balanced 110-ohm line smack dab against a 75 ohm BNC socket. Or that nice
piece of pro-sumer gear only comes with a strange digital spigot that blinks at
you (otherwise known as TOSLINK optical). For all these minor tears in the fabric
of creation we offer you the DMM100 Digital Matchmaker and we send personal
thanks to all those designers who managed to create four incompatible ways to
do the same job.

The DMM104 is a 1X5 Digital Audio Distribution Amplifier. It accepts one
AES/EBU digital audio signal on any of the following four inputs:

1. 110 ohm balanced XLR

2. 75 ohm BNC

3. 75 ohm RCA (S/PDIF)

4. TOSLINK™ optical fiber

The DMM104 duplicates the input signal and provides 4 S/PDIF digital audio
outputs on RCA connectors, plus a TOSLINK™ optical fiber output.

PERFORMANCE

Both the DMM100 and the DMM104 accept AES/EBU digital audio signals from
an XLR female 110 ohm line, a BNC or RCA 75 ohm line or a TOSLINK™ optical
fiber. Electrical inputs as low as .10Vp-p and optical inputs corresponding to a
maximum plastic fiber cable length of 10 meters are properly detected and
reshaped.

The DMM100 and DMM104 provide a signal bandwidth of 12MHz to handle
digital audio sampling rates of 27 to 96kHz.

The DMM100 simultaneously drives an XLR male 110-ohm output at 3.5Vp-p
and a BNC or RCA 75ohm output at 1.0Vp-p and a Toslink optical transmitter.