Practical Devices Corporation
XM4 Photo Gallery

XM4 Headphone Amp XM4 Headphone Amp XM4 Headphone Amp

XM4 Headphone Amp XM4 Headphone Amp

XM4 uses a professional controlled-impedence Printed Circuit Board (PCB).

Optional Lithium-Ion FastCharge® System connected to XM4.

FastCharger will charge the internal Lithium battery in approximately 90 minutes.

FastCharger is a "World" charger - it will operate from 105 to 240VAC, 50 or 60Hz. If you live outside of North America, you may need a plug adapter, to fit the North-American-style AC mains prongs.

XM4 and Lithium-Ion FastCharge System Solid metal jacks, for a reliable and noise-free connection. XM4 solid metal 3.5mm stereo audio jacks
Gold-Plated amplifier socket, for the best possible contact. XM4 gold-plated amp socket
XM4 internals
Volume knob has a steel shaft and bushing (not plastic) for extra strength, rigidity, and reliability. XM4 steel shaft volume knob
Solid Aluminum Case is very strong and durable.

XM4 shown underneath tire of 3,800lb (1,700kg) car. Note: Warranty does not cover damage from being run over!

XM4 Super-Strong Anodized aluminum case
Gang of Rogue XM4's
XM4 shown mated to iPod video, using included velcro dots. XM4 and ipod video
ipod video 30gb 80gb
Crossfeed Adjuster knob on rear of XM4. Turn this to adjust the amount of crossfeed.

Crossfeed is enabled or disabled by the button on the front panel.
XM4 Crossfeed Adjuster

ipod video 30gb 80gb

4.75" (approx. 8" tip-to-tip) gold-plated 3.5mm interconnect, using ULTRALINK DISCOVERY® Advanced Performance High Resolution Directional Twisted-Pair Double-Shielded Audio Interface cable. This cable is included (for a limited time) as a free bonus only when purchasing direct from our website.

A 6-foot (1.8m) version (shown below) is also available. Email for details.
What's Included:
XM4 What's Included
XM4 6-foot (1.8m) cable
XM4 mated to full mp3 system XM4 Block Diagram XM4 Dimensions


All contents Copyright © 2008 Practical Devices Corporation