The Official Yamaha RX V663 Owners Thread

[dobyblue]

Originally Posted by kingofgrills

I'm sorry, but the Onkyo 805, 875, and 905 DACs are the same 192kHz / 24 bit Burr Brown DACs found on all channels of the Yamaha receivers, including the lower end 663. These were first introduced in Yamaha's line on the RX-Z1 flagship receiver, and they've been used throughout Yamaha's line for years.

I'm sorry but you don't know what you're talking about. The sampling rate of a DAC has nothing to do with which DAC is being used. There are lots of 24/192 DAC's made from various companies, including several models from Burr Brown. Their specifications are all different.

The Yamaha RX-V3800 uses PCM1791A DAC's, which have 113 dB of dynamic range and are capable of DSD conversion and PCM at 24/192. The Denon 4308CI and Yammy RX-V1800 also use this DAC.
http://focus.ti.com/docs/prod/folder.../pcm1791a.html

(The links are mostly to Texas Instruments, because that's who owns Burr Brown now)

The Yamaha RX-Z9 uses a far better DAC than the 3800, the DSD1792, which is capable of 132 dB of dynamic range and DSD to analog conversion and PCM at 24/192. It doesn't support TrueHD or dts-ma though.
http://focus.ti.com/docs/prod/folder...t/dsd1792.html

This is the ONLY Yamaha receiver with this DAC.

The Yamaha RX-Z11, Onkyo 805, 875 and 905 use the PCM1796 DAC, which has dynamic range of 123 dB and of course DSD to analog and 24/192 PCM. The Denon 5308CI also employs this DAC.
http://focus.ti.com/docs/prod/folder...t/pcm1796.html

To summarize:

Burr-Brown PCM1791A  113dB SNR  $ 3.00/ea    Yamaha RX-V3800, Yamaha RX-V1800, Denon 3808, 4308 and DVD-2930CI
Burr-Brown PCM1796   123dB SNR  $ 6.50/ea    Yamaha RX-Z11, Onkyo 805/875/905, Denon 5308 and DVD-3930CI
Burr-Brown PCM1792A  127dB SNR  $13.00/ea    ? 
Burr-Brown PCM1792   132dB SNR  $13.65/ea    Yamaha RX-Z9, Denon 5805ci and DVD-5910

Sure if the components surrounding the PCM1792 chip are crap then you're going to get crap out, but usually this is not the case. It's important to know that the majority of DAC's support 24/192 right now and also Burr Brown is not the best name in DAC's either. The new $7,000 flagship Pioneer Elite receiver for example, the SC-09TXH, uses Wolfson DAC's.

http://www.pioneerelectronics.ca/POC...ivers/SC-09TXH

I hope this helps a little for you and others to understand DAC's a little better. When someone is considering Blu-ray or Super Audio CD, where dynamic range can play an important part in your overall listening enjoyment, getting deeper into DAC's and how they work is important. Super Audio CD has a dynamic range of 120 dB, so why would you want to get a DAC with only 113 dB dynamic range if SACD is important?