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polchik · 27th November 2003

greetings everyone,

got a question regarding playback sync with a HEDD 192 and the 001

when monitoring thru the HEDD da's what is the best sync option.....internal (001 clock master) or sddif rca (HEDD clock - derived from syncing PT to the HEDD AD clock)

i've obviously tried both and only notice a very slight difference. i would imagine that the hedd has the best (stable & accurate) clock, but i wonder about the 001's PLL, which must come into play if it is syncing to an external source....then, it would send this clock (from hedd) back out thru the 001 spdif out to the hedd DA, where the hedd's PLL would have to do it's thing once again before the actual analog conversion.....

internal sync would have the 001 as master, using its crystal osc. and only 1 phase when a PLL would be used.....

i guess another question is what is more reliable the 001's PLL or its crystal osc.

has anyone else pondered these issues? am i losing my mind? LOL

my monitoring DA signal path is unfortunately this.....

001 spdif rca -> HEDD 192 spdif in /analog XLR out -> mackie VLZ 1402 -> tannoy active reveals

any comments will be much appreciated!
thanks very much in advance!
paul

27th November 2003	#1
polchik Gear interested Joined: Aug 2002 Location: toronto Posts: 6 Thread Starter	clocking HEDD 192 DA with 001 greetings everyone, got a question regarding playback sync with a HEDD 192 and the 001 when monitoring thru the HEDD da's what is the best sync option.....internal (001 clock master) or sddif rca (HEDD clock - derived from syncing PT to the HEDD AD clock) i've obviously tried both and only notice a very slight difference. i would imagine that the hedd has the best (stable & accurate) clock, but i wonder about the 001's PLL, which must come into play if it is syncing to an external source....then, it would send this clock (from hedd) back out thru the 001 spdif out to the hedd DA, where the hedd's PLL would have to do it's thing once again before the actual analog conversion..... internal sync would have the 001 as master, using its crystal osc. and only 1 phase when a PLL would be used..... i guess another question is what is more reliable the 001's PLL or its crystal osc. has anyone else pondered these issues? am i losing my mind? LOL my monitoring DA signal path is unfortunately this..... 001 spdif rca -> HEDD 192 spdif in /analog XLR out -> mackie VLZ 1402 -> tannoy active reveals any comments will be much appreciated! thanks very much in advance! paul