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hollowman wrote:
Which AKM receiver chip is used by that Ayre CX-7?
John Atkinson wrote:
I am pretty sure i have a photo of the circuit boards in my lab work book, so I will check this when I am back in the office Monday.
John Atkinson wrote:
It's an AKM AK4112B.
Thx for digging up this info, JA 
One more question for you if you (or anyone) has looked inside Ayre's CX-5 or another high-end universal player:
What is the clock freq.(i.e., the freq. of the osc./crystal)? Ayre or other high-end-brand uni's may even have two main clocks: one for CD/SACD and one for DVD-based formats.
Reason I ask:
The problem with (hi-rez) PCM is that you have to support 44.1Khz sample rate and it's multiples (88.2, 176.4) and 48Khz and it's multiples (96 and 192).
Audiophile universal players -- Ayre, Linn, Esoteric, etc -- tend to sound significantly better than mainstream universal (even higher end mainstream players, like Pioneer Elite or top Denons). The mainstream units' oscillators tend to be 27MHz (I've peeked under the hood or their service manuals). 27MHz is a freq. optimized for DVD video playback, not audio. I haven't looked inside any audiophile/high-end uni.
I'd like to establish some scientific correlation to what I perceive. Speculating, 24.576MHz oscillators may be used in the audiophile uni's for DVD-based audio. Why?
Let's say that the audiophile uni player needs to play back the popular rates: 96k (DVD-V, e.g., Chesky, Classic Records HDAD, etc.) and 192k (DVD-Audio). Further, we can only use one osc. So...
96x256=24.576MHz
192x128=24.576MHz
The math works out cleanly; not messy and rounded-off division as you'd get with a 27MHz clock.
SACD, on the other hand, works at a multiple sample frequency of CD (2.822Mhz).
If anyone has looked under the hood or has info on the issue, please post it here.
Thx!
Thx for digging up this info, JA
One more question for you if you (or anyone) has looked inside Ayre's CX-5 or another high-end universal player:
What is the clock freq.(i.e., the freq. of the osc./crystal)? Ayre or other high-end-brand uni's may even have two main clocks: one for CD/SACD and one for DVD-based formats.
Reason I ask:
The problem with (hi-rez) PCM is that you have to support 44.1Khz sample rate and it's multiples (88.2, 176.4) and 48Khz and it's multiples (96 and 192).
Audiophile universal players -- Ayre, Linn, Esoteric, etc -- tend to sound significantly better than mainstream universal (even higher end mainstream players, like Pioneer Elite or top Denons). The mainstream units' oscillators tend to be 27MHz (I've peeked under the hood or their service manuals). 27MHz is a freq. optimized for DVD video playback, not audio. I haven't looked inside any audiophile/high-end uni.
I'd like to establish some scientific correlation to what I perceive. Speculating, 24.576MHz oscillators may be used in the audiophile uni's for DVD-based audio. Why?
Let's say that the audiophile uni player needs to play back the popular rates: 96k (DVD-V, e.g., Chesky, Classic Records HDAD, etc.) and 192k (DVD-Audio). Further, we can only use one osc. So...
96x256=24.576MHz
192x128=24.576MHz
The math works out cleanly; not messy and rounded-off division as you'd get with a 27MHz clock.
SACD, on the other hand, works at a multiple sample frequency of CD (2.822Mhz).
If anyone has looked under the hood or has info on the issue, please post it here.
Thx!