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发表于 2013-4-1 23:24:46
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Here is some more info from BMC.
Dimensions: 365 x 103 x 320 mm
Output Impedance:
Balanced headphone < 1 Ohm
Standard headphone about 100 Ohm*
* This is a new approach of a quasi balanced standard output with a floating mono GND. It sound clearly more quiet and dynamic compared to the standard solution.
Upsampling: None! Asynchronous upsampling is always a sound degrading procedure unless you need to reject a bigger amount of Jitter.
USB: Asynchronous of course, going even further: We managed to use a unified clock for the Sabre DAC and the USB, so the internal Sabre DPLL isn't needed.
DSD: One reason for the delay is the implementation of DSD. Hope it will be finished quickly.
The headphone amp has a very unique approach. Of course it uses our LEF circuit, therefore it is a single ended class A performance without a feedback loop. The amp itself is a part of the DAC's I/V converter, so the DAC goes directly to power without any extra stage. Usually you wouldn't use big transistors for a headphone amp due to their capacitive load and bandwidth; but in this configuration we need to perform the bandwidth limiting of the I/V converter. This means PureDAC is using 8A output devices (!!!) of a special and rare kind: Lateral MOSFET, known for fantastic sound quality (you can see by the specs), but having some problems of delivering very high power due to saturation limitations, which is true for speaker but never for headphone drive.
This is why we can enjoy all the sonic beauty of this solution without any drawback, and also dare to offer an output impedance close to zero, delivering a fantastic control!
The XLR line out uses an LEF vertical DMOS-FET stage. Unique and challenging any preamp available regardless of the price.
PureDAC is designed for balanced use and any other use would be a waste. It is true high end and should be used and combined accordingly - once you see an inside photo you will understand how different it is.
Concerning the power it simply a question of impedance. The voltage range is always the same and due to the very low output impedance just the headphone determines the maximum power by it's current request. For low impedances like 32 Ohms you better don't use the very high volume levels.
PureDAC features our exclusive DIGM, so you don't need to worry about impedance / gain matching of headphones. |
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发表于 2013-1-8 13:19:35
