The digital section of the Yamaha RX-665 looks much much better than the power supply and power amp section. Let’s take a look from the input end.
The HDMI connectors are directly soldered on to the board. They are controlled by Silicon Image’s chips,
- Receiver: SiI9233
- Transmitter: SiI9134
These chips can handles up to 4 HDMI devices. I doubt Yamaha’s earlier model like V653 uses the same chip set as that unit can only handle 2 HDMI devices.
Up the stream, we find the ADI ADV7800 comb filter and 10 bit ADC. This is the chip that converts analog video signal to digital. What I was surprised to find next to it is the Anchor Bay’s VRS ABT1012 upscale chips. Surprised, because reading from various users’ comments on the web, Anchor Bay’s VRS chip suppose to be quite good but on the other hand, it seems RX-V665’s user did not feel the upscaled image is that good.
On the audio side, there is the TMS320 DSP chip. From the marking it is very clear it is used to decode DD, DTS etc. Since this chip has Ymaha’s “Cinema DSP” imprint, it is likely an ASIC that only available to Yamaha and no detail spec is available to public. Next to the DSP chip is the TI PCM1680 ADC chip. This ADC chip can do 8 channels at 192KHz and 24bit. Oh. BTW, Burr-Brown is now TI but I guess Yamaha still think Burr-Brown is a better name to list as “feature”. Notice the marker writing on the board? Doesn’t look very professional isn’t it?
Without doing any testing, just looking at this digital board, one can reasonably assume it can do a decent job as pre-pro.
Links to major components mentioned:
One thing need to be mentioned is that the HDMI output of the RX-V665 does not enough power to drive none powered external device such as HD Fury. As result, if you are plan to use this receiver with HD Fury, you need to power HD Fury with its own optional power supply.