Amptron DigitaltoAnalog ConverterAmplifier Model 250 A250 user manual

User and Installation Guide
 microFIDELITYTM
  Digital-to-Analog Converter/Amplifier
  Model 250Connect the AC adapter with the amplifier 
BEFORE plugging the AC adapter into an 
outlet to avoid spark generation! 

Contents
Unpacking
Preparing your audio source 
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Thank you for purchasing this high-quality digital-to-analog converter 
with integrated audio power amplifier. This product contains advanced 
audio amplification technology which provides the audio quality of :mTsazpmu/UCheck that this package contains:
- one digital-analog converter/amplifier - Model 250
- one large AC adapter (wallwart)User and Installation GuidePage 3Listening to your speakers at high volume over extended
periods of time can damage your hearing. Adjust the 
amplifier volume control...

Page 4User and Installation GuidePreparing Your Audio Source
This amplifier DOES NOT decode compressed audio formats such 
as Dolby Digital. Therefore, make sure to set your audio source to 
deliver uncompressed linear audio (also known as PCM or LPCM).
To do so, go to the audio interface settings menu of your source 
and select "PCM" or "LPCM".
If your source offers a setting for changing the sampling rate of the 
audio interface, set it to a sampling rate of less than 192 kHz for  

User and Installation GuidePage 5OPTICAL
OUTDigital Audio SourceAmplifierDC 36 VAC adapterOutletOptical Toslink
audio cable 

User and Installation GuidePage 6Connecting Your Speakers
Turn the amplifier volume to a fairly low setting. Next, connect your 
speakers with the amplifier via regular speaker cables. To connect 
the speaker cables to the amplifier, carefully press the spring-
loaded clamps on the rear of the amplifier. Then insert each 
speaker cable and release the speaker clamp.
Pay attention to the polarity (color coding) of the speaker cable 
when making the connection to ensure that both speakers are in Make sure...

User and Installation GuideSpeakersAmplifierPage 7 

Technical Specifications
 
Output power:  2 x 40 W (rms)
Supported digital audio formats: 
  Linear PCM (uncompressed) - SPDIF
Supported sampling rates: 32 kHz - 192 kHz
Supported digital word width: 16 to 24 Bits
Dynamic range / signal-to-noise ratio: 112 dBA
Frequency response: 1 Hz - 20 kHz @ SR > 32 kHz
Total harmonic distortion (THD+N): 0.04 % @ 20 W, 1 kHz
Power efficiency: 93 %
Channel separation: 77 dB
Idle power consumption: < 3 W
Dimensions: 3-9/16 ” (W) x 3-7/16 ” (D) x 3/4 ” (H)...

                 READ THESE SAFETY INSTRUCTIONS CAREFULLY
                 AND HEED ALL WARNINGS IN THIS MANUAL.
POWER SOURCE
To avoid product malfunction, and to protect against electric shock, fire or 
personal injury, please observe the following:
• This product has been designed to work with 120-volt AC current using
  the supplied AC adapters. Connection to a line voltage other than that or
  use of non-compatible AC adapters may create a safety and fire hazard
  and may damage the product.User and...

CARE
• Do not place any object containing water or other liquids on this product.Copyright (C) 2014 Amphony. All rights reserved.
The information contained herein is subject to change without notice. 
Revisions may be issued to advise of such changes and/or additions.
All product names, trade names, or corporate names mentioned in this 
document are acknowledged to be the proprietary property of the User and Installation Guide