Jetway JNC62K (GeForce 8200 on mini-ITX)

Audio Performance

The audio performance tests were done using Audio Rightmark 6.0.5 and a 3.5mm gold plated, oxygen free stereo loop back cable between stereo out and microphone input. Results were taken at the DVD sample rate of 16-bit/48KHz and High Definition 24-bit/96KHz.

What we're looking for:

• Noise Level: A higher negative is better. This is usually viewed in relation to a signal level which provides a signal to noise ratio. As you get closer to zero there's more noise and lesser audio fidelity.
  
• Frequency Response: Two values listing how close to the lower higher frequencies the codec can reach. If it hits them perfectly it'll display a 0, 0.
  
• Dynamic Range: The difference between the loudest and quietest sounds the codec can make before it distorts them. The larger the gap, the better.
  
• THD and IMD percentage: Closer to zero is better. THD and IMD are best looked at together, where as if you have a lot of THD and not much IMD, then it'll offer a warmer accurate sound. High THD and IMD provides a warm, inaccurate sound, low THD and high IMD gives a cold inaccurate sound and finally low THD and IMD gives a cold accurate sound.
  
• IMD = intermodulation distortion and is a fancy way of saying conversion interpolation, which is a basic detection of the quality loss after an analogue to digital then digital to analogue conversion. By comparing it to a highly compressed source it shows up problems with the codec and converters.
  
• THD = total harmonic distortion, which shows up unwanted harmonics; integer multiples of the original component sound that can be second, third, fourth degrees or overtones for example.
  
• Stereo Crosstalk: where the stereo channels "talk" to each other and interact. Ideally you want them entirely separate, unmixed or echoed in either channel, so a higher negative a result as possible is preferred.

16-bit / 48KHz

24-bit / 96KHz

The Realtek ALC883 is a value-orientated High-Definition chipset and it’s the same one that was used in the Asus P5E-VM HDMI. The quality is slightly better than the Asus board, but it's still very much lower than the Gigabyte board, which instead features the appreciably better Realtek ALC889a codec.

The audio quality isn't that bad, but it's not brilliant either – it depends on the quality of your speakers and source whether you'll really care or notice the difference. Given the fact that there's just one PCI slot, we'd encourage using the S/PDIF pass through for HDMI where possible or probably a USB sound card if you want to use a (dual) TV tuner in the expansion slot. We can understand why Jetway has done this – it's primarily designed as an industrial board rather than specifically for HTPC, however we'd love Jetway to tailor it with a better quality codec like the one Gigabyte uses.