What is my next step to a better sound ?

One thing that hasn't yet been mentioned is that if your connection between the Blu-Ray player and the RDAC is via digital coax, the LENGTH of the cable can be a significant factor. It should either be very short, less than say 12 inches, or it should be 1.5 meters or a little longer. See this paper.

Use of intermediate cable lengths, such as 1 meter or 3 feet, can worsen jitter by causing waveform reflections resulting from impedance mismatches to arrive at the DAC input at critical points on the signal (i.e., near the mid-point of its 0 to 1 or 1 to 0 transitions).

Use of non-optimal cable lengths is most likely ONE reason for reports of sonic differences between transports. Different transports will have different degrees of impedance mismatch to the cable and connectors, and perhaps more significantly will have different transition times (risetimes and falltimes). If a non-optimal (intermediate) length is used, the effects of impedance inaccuracies will vary unpredictably depending on the relation between cable length and signal rise and fall times, and also on the jitter rejection capability of the particular DAC.

Regards,
-- Al

I've heard the rDAC. I heard it burned in and warmed up against the Rega DAC that I bought which was fresh out of the box and cold (my dealer and I unsealed it). The Rega DAC beat it hands down. There was nothing the rDAC did that the Rega DAC didn't do at a higher level. That wasn't the only DAC I heard during that audition, but I gave it a significant chance, as I wanted to save some cash.

The rDAC is excellent for the money. If that was all my budget would allow, I'd be very content with it. That being said, there's no such thing as a free lunch, and the rDAC just flat out isn't in the same league as the rest of his system.

I've heard the rDAC several times since. It mops the floor with anything at or under it's price that I've heard. But it can't hang with a Levinson system/Wilson system. It's like putting a VW GTI engine in a Porsche 911 Turbo.

Your preamp, amplifier cables and speakers are solid. These components are the bones of any system and tend to have much better longevity than digital because they do not evolve as quickly as digital.

The semiconductor industry responsible for all that digital stuff operates in a 12 month cycle known as "Moore's Law". Moore's law (google Gordon E. Moore) essentially states that transistor count doubles and price halves every 12 months. This has been the case since 1965 when Mr. Moore authored his law. While this may or may not be interesting, it means that semiconductor companies constantly churn new products to take advantage of manufacturing cost reductions and product performance improvements.

It takes much less time to fall behind the digital technology curve than in analog technology. The vacuum tube is Exhibit A as an example of analog staying power. These technology curves should be a consideration for all future system purchases. Think long term for amps, preamps and speakers but think Moore’s Law (short term) when it comes to digital and adjust your return on investment calculation accordingly.

All things can be improved, but in your system the digital provides the biggest opportunity for improvement. It could be as simple as upgrading the power supply to your rDAC but that’s pretty tweaky. There are a lot of really good DACs in the $1K to $2K price range that will noticeably improve your system and you can do it all over again in about 12 to 18 months.

But then you might start noticing a difference in transports... :)

Greg

I was thinking about this around one year ago. I was trying to find a better source for digital playback thinking that the source was the most important component to make the best upgrade to the next level. Well is does matter very much but what happened to me was that someone brought over a preamp that turned my system around completely. Since that time I have compared the preamp to manny of the typical manufactured preamps but none of them could get me to the next level. It happens to be a DIY preamp so it is not currently available on the market yet. So take my comments as you will but I could have never gotten there with a better source.

Happy Listening.

Your base system is a wonderful system. I see two maybe three areas where there may be problems with sound reproduction. 1) CD Transport, 2) DAC, 3) Room

The inexpensive CD transport you are using is an issue. I have compared many transports into the same DAC/system and there are widespread differences in the sound. You should borrow better transports and hear the differences.

The DAC also made a major difference to me. I have also compared many DACs and they really do make a major difference. The power supplies in the DACs are the major weak point. The Analog output portion in DACs are similar to pre-amps and if the power supplies are not really beefed up, they will not sound good.

The room may require major corrections for bass or mid level or high frequency sound corrections and reflections. My main problem in my system is the room.

As a side note,you do not need to purchase stupidly expensive CD transport or DACs. There are some out there used that are incredible. For example, Pioneer Elite's DVD 09 CD players is one of the best constructed and wonderful transports (not CD player) that I have ever heard and I have compared it with many other much more expensive transports. It is built like a tank and seriously overbuilt. The Digital output of this unit rivals the best out there and you can get one for a steal used.

The used Theta DS Pro-Gen V DAC is wonderful and is very hard to beat by other DACs and relatively inexpensive used.

I have had many come by my home to hear their music on this transport and DAC combination and they left with jaws open.

People upgrade DVD players because they want newer bells and whistles, such as HDMI outputs. However, if you are using it solely as a CD transport, then wow!

I have compared them with newer more expensive DACs and CD player/transports and again, pioneer elite in the day was the state of the art in many areas. Don't overlook this relatively inexpensive but definitely high-end used combo.

There are others out there also, but find a friend or shop that is willing to let you borrow a demo CD player and/or DAC and to take it home for a week or so to listen, then make an informed decision.

enjoy.