Sony scd xa777es vs scd777es

Metralla

I am not an electrical engineer but that circuit does not appear to be a very efficent design and one that would seem to degrade from the sonics. This is why the person modding my player (RAM east)wants to eliminate 90% of the output(audio) board with one pair of summing op amps and then into a transformer stage and then directly into the rca's.

There have been several threads on audiogon debating the fact that the Sony's balanced outputs are truly balanced. The person modding my player tells me they are not and explained why, but I can not remember.

Chuck

Chuck,

What modders can do is use high-end parts that are not cost effective for even fairly expensive production units, such as the SCD-1. But I'm pretty sure the engineers at Sony know a lot more about circuit design than whoever is modding your unit. Sony can afford to hire some smart folks. The use of balanced lines is common in commercial applications where long leads are needed. So I'd take the explanation provided by your modder as just more of the mysticism that previals in high-end audio.

db

Unless the signal is balanced throughout, it is not balanced when it comes to the XLR's. There is more to 'balanced' than simply slapping a pair of XLR plugs into a CDP.

db

Yup, I hear you....I too was skeptical but when I observed some of his work on other players I am convinced he knows his stuff. I did do some research and what he is proposing is actually more common than I first thought as other modders do some of the same kind of mods i.e. mod wright and (VSE) vacum state electronics. Plus they (Reference Audio Mods) is a partner with Audio Consulting out of Switzerland which has done some interesting work as well as designed and developed various audio products. I had the opportunity to hear their silver rock passive pre-amp and was amazed at its clearity and detail.

In the end I am convinced that you can not get the most out the Sony player by simple R&R work. That circuit design needs to go along with the parts for best performance.

Sony engineers, while I am sure very intelligent, can not design this kind of circuitry for pedestrian products; corporate dynamics get in the way. I am not infering they don't have the ability it is just that their hands are tied.

Chuck

The warranty on my SCD-1 is up in a couple of months and I believe Allen Wright has a mod that makes this player truly balanced,but it's fairly expensive.I've been kicking this idea around and going for the 5+ mod,or getting a very good DAC to compliment my player.The only downside to getting the DAC is it will only benefit it's Redbook performance.The new + mod is supposed to bring the SACD performance of the SCD-1 to a superb level,so I too,will be following these threads very closely over the next few months.Gary.