[AV] DAC used by AV Amplifier / Processor

[Raymond Wan]

When a stereo DAC is used in dual mono mode (i.e. 1 stereo DAC for 1 Channel), one of the properties that changes is the SNR.

Typically a gain of 6dB is made when using a DAC in this way.



However, once you get over 110dB SNR, the differences are largely irrelevant.

Anyway, you also gain channel separation by ensuring discerete DACs.



However, the DAC is only 50% for overall audio performance.

The choice of op-amps, capacitors, and power supply make the other 50%.



Also for DACs, the linearity doesn't vary so much.

But distortion and particularly slew rate for dynamic movies can make a large difference.

[calvin1800]

But I saw the cataloge, between AVR-1611 and AVR3311, DAC is same as DSD1608 and only used 1 pcs for DAC, those are same. Please advise how is different on sound performance, thanks.

[Raymond Wan]

But I saw the cataloge, between AVR-1611 and AVR3311, DAC is same as DSD1608 and only used 1 pcs for DAC, those are same. Please advise how is different on sound performance, thanks.

You need to open up the machines and compare the circuits to see whether AVR3311 has done a better job on the associated components such as op amp, capacitors, power supply, etc.



The easier way is go to listen, audit and compare the actual sound performance from them side-by-side.

[calvin1800]

I knew that other parts must be better than entry level, but I think manufacturer may be earn the profit is not a probate since the selling price is big room compared with other's, also the DAC is important in AV amp.

[Raymond Wan]

I knew that other parts must be better than entry level, but I think manufacturer may be earn the profit is not a probate since the selling price is big room compared with other's, also the DAC is important in AV amp.

As I have mentioned before, the cost of the DACs are not significant for low grade and high grade.

Only with the High-End AVP, they will use high grade DAC but they also need to invest more to design the circuit and associated components.

Hence, even one entry product and one middle class product use the same DAC, their internal component may be totally difference.

It is similar to computer, there are so many notebook with same CPU i3, i5 or i7.

However, their config are total different and so do their price which reflecting the performance.



Although the DAC is a important component, you may need to check with other associated component before you can judge the AV amp or AVP is good or bad.

Otherwise, there is no listening test or comparison is required.

You may select the machine by purely looking at the specification.

[akiraku]

LX83 用邊粒

[Raymond Wan]

LX83 用邊粒

It has been announced LX83 will use new 32-bit DACs



But it needs to be verified later

[單眼仔]

[Raymond Wan]

一般優質 Blu-ray 机及 AV Amp / AVP 用 4 顆 Stereo DAC 去處理 (7.1) 8 聲道

即每 1 顆 Stereo DAC 去處理 2 個聲音頻道



而頂級的 Blu-ray 机及 AVP 則用 8 顆 Stereo DAC 去處理 (7.1) 8 聲道

即每 1 顆 Stereo DAC 去處理 1 個聲音頻道 (Dual Mono Mode)

每聲道都以兩倍的數位類比轉換電路併聯運作，大幅提昇聲音重播品質

[aw11onfire]

一般優質 Blu-ray 机及 AV Amp / AVP 用 4 顆 Stereo DAC 去處理 (7.1) 8 聲道

即每 1 顆 Stereo DAC 去處理 2 個聲音頻道



而頂級的 Blu-ray 机及 AVP 則用 8 顆 Stereo DAC 去處理 (7.1) 8 聲道

即每 1 顆 Stereo DAC 去處理 1 個聲音頻道 (Dual Mono Mode)

每聲道都以兩倍的數位類比轉換電路併聯運作，大幅提昇聲音重播品質

其實有無一粒處理只可處理1 channel ...

1粒處理1channel 但又有處理2channel 既能力..
即 source--> 1開2 ---> 1粒同時處理2個channel(但內容一樣)--->2合1-->輸出

定係佢個work flow 唔係咁既,唔使1開2,2合1,另一處理能力完全唔用....

[Raymond Wan]

一般優質 Blu-ray 机及 AV Amp / AVP 用 4 顆 Stereo DAC 去處理 (7.1) 8 聲道

即每 1 顆 Stereo DAC 去處理 2 個聲音頻道



而頂級的 Blu-ray 机及 AVP 則用 8 顆 Stereo DAC 去處理 (7.1) 8 聲道

即每 1 顆 Stereo DAC 去處理 1 個聲音頻道 (Dual Mono Mode)

每聲道都以兩倍的數位類比轉換電路併聯運作，大幅提昇聲音重播品質

其實有無一粒處理只可處理1 channel ...

1粒處理1channel 但又有處理2channel 既能力..
即 source--> 1開2 ---> 1粒同時處理2個channel(但內容一樣)--->2合1-->輸出

定係佢個work flow 唔係咁既,唔使1開2,2合1,另一處理能力完全唔用....

1 Stereo DAC 設計用作處理 2 Channel 不同訊號 (即用 2 CPU --> 2 Channel = 1 CPU --> 1 Channel)

呢個咪 1 ==> 1 (1粒處理1channel，粒 DAC 有處理2channel 既能力)



現用 1 Stereo DAC 特別用作處理 1 Channel 相同訊號 (即用 2 CPU --> 1 Channel)

Dual Mono Mode --> 即 2 CPU 同時處理 --> 提升 SNR 訊噪比最少 6dB

有利性能及表現更強勁

將來可能有 2 粒 Stereo DAC 處理 1 Channel



你用電腦 CPU

喜歡用 Single-Core, Dual-Core, Quad-Core, .....

Core Solo, Core Dual, Core 2 Solo, Core 2 Dual, Core 2 Quad, Core 2 Extreme, .... ??

[Raymond Wan]

Pioneer Blu-ray 机 BDP-51FD / LX-71 用 4 顆 Stereo DAC 去處理 (7.1) 8 聲道

Wolfson WM8740 x 4

即每 1 顆 Stereo DAC 去處理 2 個聲音頻道





Pioneer Blu-ray 机 BDP-09FD / LX-91 則用 8 顆 Stereo DAC 去處理 (7.1) 8 聲道

Wolfson WM8740 x 8

[aw11onfire]

Pioneer Blu-ray 机 BDP-51FD / LX-71 用 4 顆 Stereo DAC 去處理 (7.1) 8 聲道

Wolfson WM8740 x 4

即每 1 顆 Stereo DAC 去處理 2 個聲音頻道





Pioneer Blu-ray 机 BDP-09FD / LX-91 則用 8 顆 Stereo DAC 去處理 (7.1) 8 聲道

Wolfson WM8740 x 8

如此類推..
用16粒咪仲勁.....

其實用得multi core ...multi threading...
os 相對一定覆雜...(win7 v.s. dos 6.22)
但...
唔係簡單就是好咩...

[Raymond Wan]

如此類推..
用16粒咪仲勁.....

其實用得multi core ...multi threading...
os 相對一定覆雜...(win7 v.s. dos 6.22)
但...
唔係簡單就是好咩...

其實也有不少是用 1 粒 --> 回帶 P.1



1 粒 DAC 去處理 (7.1) 8 聲道

你自己慢慢揀

小貼士 --> 平價机多數合你要

好多用 1 粒 DAC

夠晒簡單



Denon:
AVC-2808, 2809, 3310: DSD1608×1

Onkyo:
TX-NR807: PCM1690x1
TX-SR806: CS4382A×1
TX-SR707: PCM1690x1
TX-SR705: CS42528×1
TX-SR706/606/607/507: CS42518×1

Yamaha:
DSP-AX1065/DSP-AX765/DSP-AX665/DSP-AX565/DSP-AX465/DSP-AX863: PCM1680×1
DSP-AX768: PCM1680×1

Marantz:
AV 8003: CS4382A×1
SR 8002: CS4382A×1
SR 7002: CS4382A×1
SR 6003: CS42528×1

[r32]

LX83 用邊粒

It has been announced LX83 will use new 32-bit DACs



But it needs to be verified later

http://www.avsforum.com/avs-vb/showthread.php?t=1242889&page=7

"The SC-37 also... has a different Digital Core Engine it is a Dual Freescale/TI Aureus 32-BIT.
....up samples all audio to 192 kHz/24-Bit."

"Pioneer is no longer using Wolfson DAC's in the SC-37. They all said that it uses Texas Instruments DACs and that the Freescale and Texas Instruments Aureus 32-bit Digital Engine contains the DAC and ADC referenced on the brochure."

" However there is no TI Aureus which has those functions on the chip. Unless its something Freescale/TI brewed just for Pioneer."