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| [#11] Blogs: 數碼音樂重播專欄 (8) would you recommend Weiss the next weiss medea +++ to have a world clock input??? |
batmanames04 正式會員38.xxx.xxx.20 |
2011-12-09 02:51 | |
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| [#12] Blogs: 數碼音樂重播專欄 (8) Hello Batman hing, First time I did that was 1999 before the first Medea launched. At that period of time, using WLK Slave will makes Medea sounds worse, therefore Weiss abandoned the idea. In last decade, the industry has improved technology to have WLK Slave without worse performances, but by NO means "better". |
DWS 正式會員 58.xxx.xxx.142 |
2011-12-09 12:12 |
| [#13] Blogs: 數碼音樂重播專欄 (8) Unfortunately, these so called industry experts still have no idea that long term clock accuracy has nothing to do with jitter (short term accuracy). An atomic clock buys you long term accuracy. But in audio, we need short term timing accuracy - the correct timing on the rising edge of the biphase S/PDIF signal. Atomic clock with its low ppm design is not the ideal clock for audio. To make matter worse, the use of an external clock divider to divide down a 10MHz clock signal to one that is suitable for audio will increase the jitter further on the clock signal. A proper clock design would use a high Q x'tal with a clock circuit that does not degrade the Q value of the x'tal. That means internal clock, not external clock. An atomic clock cannot achieve phase noise of -140dbC/Hz at 100Hz, where a high Q x'tal internal clock design can. A good internal clock is not only way cheaper, but also way better than an external clock. The trick is how to find this high Q x'tal and how to design this clock circuit. The external clock is only useful for sycn'ing multiple digital devices/sources. It is not really useful for playback or even ADC, unless the internal clock in your playback device or ADC is crap. And finally, Async USB / Firewire does not work the same as sending back the clock line from the DAC to the transport. These asyn devices buffer the audio data and reclock the audio data using its own internal clock. 最後修改時間: 2011-12-12 10:25:50 |
Kuro 正式會員 116.xxx.xxx.97 |
2011-12-12 10:19 |
| [#14] Blogs: 數碼音樂重播專欄 (8) Using clock in studio, understandable! Using clock in home, because the manufacturer using 5 cents std xtal in their machine, opening another door for extra clock unit sale, not because atomic clock is good, just the clock in CDP/DAC just too bad in comparison for "room for improvement", industry expert still a businessman, they know it but just don't want to let you know, honest don't gain them a bowl of rice!! |
hercules 正式會員 1.xxx.xxx.37 |
2011-12-12 13:12 |
| [#15] Blogs: 數碼音樂重播專欄 (8) Very enlightening comments. But there are loads of +ve comments re master clocks.... 20~30% better...spatial ... musical... etc Could it be just mix-n-match improvement? |
homantin 正式會員 121.xxx.xxx.155 |
2011-12-12 18:58 |
| [#16] Blogs: 數碼音樂重播專欄 (8) As Hercules was saying, the internal clock was too poor so you get this 20-30% improvement. A really low phase noise internal clock has 100-200% improvement. |
Kuro 正式會員 116.xxx.xxx.97 |
2011-12-12 22:06 |
| [#17] Blogs: 數碼音樂重播專欄 (8) oic. Thx for explanation. I'll keep my$$$ for other toys. |
homantin 正式會員 121.xxx.xxx.155 |
2011-12-12 23:18 |
| [#18] Blogs: 數碼音樂重播專欄 (8) I'm working on cas. Any good suggestion on digital interface (DDC) in the same time I can use Stanford PERF10. But the DDC output must be AES |
jf09 正式會員 111.xxx.xxx.3 |
2012-12-29 20:39 |
| [#19] Blogs: 數碼音樂重播專欄 (8) If CAS output to DAC using async USB interface, external clock only use as replacement of the internal clock if the internal clock quality is not good enough. See many ching's post in this thread. 最後修改時間: 2012-12-29 21:25:33 |
odysseyhk 正式會員 218.xxx.xxx.9 |
2012-12-29 21:23 |
| [#20] Blogs: 數碼音樂重播專欄 (8) Hi jf09, then you will need a DD which inputs 10MHz. I think only antelope is going this direction. |
DWS 正式會員 219.xxx.xxx.192 |
2012-12-30 00:32 |
