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But it only drops 8 dB! That’s a massive 12 dB error. Dropping the input from 0 dBFS to –20 dBFS should drop the output by 20 dB as well. The Micro II was displaying a horrible linearity problem. When I dropped the level to see if the distortion would drop, I found the problem. Then I checked the 1 Khz THD and while it wasn’t great it also wasn’t bad enough to explain the poor sound quality.

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POOR DRIVER DESIGN (updated): I first checked the Micro II’s frequency response and it was reasonably flat out to 15 Khz so the poor sound was still a mystery. I was really curious to measure the Micro II and find out why it sounded so obviously bad. Playing familiar well recorded audiophile tracks the Micro II made them sound shrill, glaring, and harsh regardless of what headphones I used. The sound quality, however, was seriously odd. SUBJECTIVE SOUND QUALITY: There was moderate hiss with my Ultimate Ears IEMs but the Micro II was fairly quiet with less sensitive headphones. The only sample rates and bit depths available are 16/44 and 16/48 as shown to the right in Windows 7. Windows reported it as a “USB Sound Device”.

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WINDOWS INSTALLATION: The Micro II installed smoothly in both XP and Windows 7 without needing any drivers. There’s no volume control, other controls, or inputs of any kind-just a blue LED. It has a single 3.5mm jack which serves as line out, headphone out, and an optical digital out (using a supplied 3.5mm-to-Toslink adapter). TURTLE BEACH MICRO II: The Micro II is a small “dongle” with an attached 2 inch “pigtail” USB cable. I also have updated how I test and present DAC results.

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According to Turtle Beach, it’s supposed to provide “higher quality sound” compared to internal PC audio. The $25 Turtle Beach Audio Advantage Micro II is just such a DAC.

The DACs are all small, easily portable, and USB powered. The idea is to test the DACs with a high impedance load (such as the O2 Headphone Amp) and a typical headphone load.

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You can purchase the Turtle Beach AK-R8 Surround Sound Headphones for $150 at retail stores or directly from Turtle Beach.INTRO: This is the first in a series of inexpensive portable USB DAC reviews I’ll be publishing in the next week or two. The AK-R8 are compatible with Windows 2000, XP or Vista.

In addition to the headphones and the USB interface, the AK-R8 includes a USB cable, an optical S/PDIF adapter for connecting to home theater equipment, an installation CD and a quick-start manual. The USB audio interface, which drives the multi-channel headphones, also features separate 5.1 or 7.1 analog and digital outputs. Positional and removable boom microphone.Super comfortable ear cup and headband design.Professional grade, durable construction.Dual sub-woofers for deep vibrating bass.USB audio interface with multi-channel amplifiers.Ability to monitor outside sounds while wearing headphones.True 5.1 surround sound from 8 speakers.

Some of the bullet point/features include: The Turtle Beach headphones provide five independent 10-band equalizers for the two front, two surround and center speakers, allowing individual customization so given all the 3D games on the market it’s important not to underestimate the value of getting the exact sound you want during game play. What is unique about the AK-R8 is the ability to tweak the surround sound to your exact liking then saving those settings for future use.