audioXpress - April 2017

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14 A New Generation ICEpower
By Ward Maas
A visit to Danish amplifier powerhouse ICEpower provided an insider’s look at its most recent advanced Class-D platform, ICEedge.

30 CEntrance DACportable High-Resolution USB DAC and Headphone Amplifier
Pushing the Envelope in Personal Audio
By Oliver A. Masciarotte and Stuart Yaniger
Take an in-depth look at CEntrance’s DACportable, featuring the AK440 D/A chip coupled with a Class-A headphone amplifier. Then, Stuart Yaniger runs the CEntrance DACportable through a series of tests to determine whether the device lives up to its hype.

40 The Hafler Revival
A Review of Hafler’s PH50 and PH60 Phono Preamps and the PH44 Moving Coil Step-Up Transformer
By Gary Galo
Delve into Hafler’s history and discover some of the company’s newest products—the PH50 and the PH60 phono preamps and the PH44 moving coil step-up transformer.

54 DIM-100—A Device for Interfacing and Measuring with Sound Cards (Part 2)
Assembly and Testing
By George Ntanavaras
After constructing the device, the test measurements revealed that the DIM-100 will enable you to interface with and measure your own audio equipment.

60 Use 6C33 Tubes to Build a Push-Pull AB Amplifier
By Gerhard Haas
Use Russian military-grade tubes to easily construct a powerful hi-fi amplifier.
IT’S ABOUT THE SOUND
8 Streaming Music Experiences (Part 4)
Streaming from Spotify
By Ron Tipton

SOUND CONTROL
22 Finding a Better Bass Trap
By Richard Honeycutt

QUESTIONS & ANSWERS
50 Prepping the Next Generation of
Audio Engineers
An Interview with Drew Waters of SPARS
By Shannon Becker