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Practical Devices Release XM4 Portable Headphone Amp
- by full monty 10-09-2007, 06:23 PM
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The Practical Devices XM4 builds on the success of the company's XM3 by adding Bass Boost, and an optional Lithium-Ion FastCharge system. The XM4's robust anodized aluminum case with glossy laser-anodized faceplate houses military-precision resistors, oversized electrolytic and tantalum capacitors, plus an ultra-low distortion gold-socketed amplification chip. Signal to noise ratio (SNR) is a staggering low 100dB, total harmonic distortion (THD) is rated at 0.002% THD, and overall frequency response is from 20Hz to 20kHz. The optional Lithium-Ion FastCharge system gives a healthy 40 hours of battery operation, while requiring only one hour of recharge time using the world-compatible AC adapter. Two front-panel LEDs (one blue, one amber) indicate power and status, and can be dimmed. A front bass boost button gives a +6dB boost at 100Hz, while another front button enables the rear panel's Crossfeed Adjuster, a knob that provides for output from near-stereo to 100% monophonic sound. The amp provides +13dB of gain, but an internal jumper can be user-configured to give an additional boost of +10dB (giving a total of +23dB), which allows the XM4 to effortlessly drive even very-high-impedence high-end headphones.

click the image below to enlarge

Practical Devices XM4


specs:
* +100dB SNR
* 0.002% THD
* Bass Boost button
* Crossfeed Button
* Variable Crossfeed Adjust
* Switchable Gain boost (+10dB)
* Auto Power-Off
* Low-battery indicator
* Optional Lithium-Ion FastCharge® System
* 40 hours battery life; 1 hour FastCharge
* Intelligent Microprocessor-controlled
* Solid aluminum case and volume knob
* Laser-Anodized front panel
* Dimensions: 3¼" x 2¼" x 1" (84 x 57 x 25mm), plus knob
* Weight: 140 grams (4.9oz)


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