Digital Audio Machine
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Product Information
Product Digital Audio Machine
Part Numbers
Ethernet Additional I/O
AM4-EA Stereo Amplifier
AM4-EB Balanced Audio and S/PDIF Outputs
AM4-MM   GPS Antenna (Magnetic Mount)
AM4-BH   GPS Antenna (Bulkhead Mount)


Output Stereo unbalanced RCA phono connectors
DAC Resolution 16 Bits
Deviation from
Linear Phase
+/-0.5 dB
Total Harmonic Distortion 0.008%
Dynamic Range
Interchannel Gain
0.1 dB
Frequency Response 10 to 20 Khz +/-0.1 dB
Maximum Phase
5 degrees
Line Output Level
4.07V p-p max into 20K (volume control adjustable)
Line Output Load 10K Ohm Minimum, 100pF Maximum
Media Compact Flash (included; contact us for current size)
If purchasing your own, please read How Much Compact Flash?
Playback Time Many hours, depending upon media
For more info see How Much Compact Flash?
Audio Format MP3 Fixed or Variable bit rate;
16 bit linear PCM (WAV)
Amplifier Provided on AM4-EA
Output Power 20 watts into 8 Ohms (15 watts when operated from a 12V supply or vehicle battery.)
THD Typical THD is 1% at nominal power.
Pro Audio Option Provided on AM4-EB
S/PDIF Digital Audio Output IEC958 (Stereo), RCA phono connector
Balanced Output Level +4dB
Balanced Output Connector Dual Female XLR and 1/4 inch phone jack (combo)
Ethernet Option Provided on AM4-EA and AM4-EB
100 Base-T RJ-45

FTP file transfer protocol
UDP control protocol


DB-37F parallel inputs select clips, play, stop, loop, mute
Contact closure or voltage inputs

Serial DB-9M RS-232, 9600 N,8,1
Real Time Clock Triggers files or playlists by day, date, time of day
Ethernet UDP control (see option E)
Response Time Less than 33 msec.
Buttons Front panel test button
Display Front panel bi-color LED
Switches Ground lift, contact/voltage control, GPS Enable, Write Protect
Pots Audio Volume Control
GPS NMEA 0183 compatible protocol on RS-232 input
Power 9VDC to 26VDC 1.5 A max (3.0A max with amplifer option)
Power Connector Barrel connector (2.5 mm x 5.5 mm x 10 mm)
Size 7"W x 7"D x 1.5"H (17.75 cm W x 17.75 cm D x  4.45cm H)
Weight 4 lbs. (1.8 Kg)
Operating Temperature 0°C (32°F) to 60°C (140°F), free air circulation
Operating Environment 0-90% relative humidity, non-condensing
Shock 20 g max Vibration
AC Adapter Specify 110 - 120 VAC 60Hz or  220 - 240 VAC 50Hz
Power Supply Compliance UL, CE, CSA, WEEE, RoHS
Specifications subject to change without notice.
MPEG Layer-3 audio coding technology licensed from Fraunhofer IIS and Thomson

3300 S. Hiawassee Rd.
Bldg. 105
Orlando, FL 32835

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