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I am doing some easy tweaks to my Marantz SA-7S1. One of them is terminating the coax and BNC jacks as well as adding the ground wire and copper ring around the ac male plug.
All of the above helps to lower the noise floor thus better detail etc.
One of the tweaks I am having a hard time with and I think I am correct. When adding the terminator to the coax the sound stage tightens up, bass is much better defined and the things become more laid back, thus a perceived smaller sound stage.
Yet at times is seems like the highs are rolling though drums and high hats strikes sound more like the real thing with great body. I keep going back and forth on this one tweak.
If I recall when the noise floor lowers their will be a perceived loss of high due to the noise being part of the reproduction as well as a more natural sound stage that may seem like a loss of detail due to listening to noise in the past.
I like the terminator in due to the much more realistic presentation top to bottom, but it takes some getting used to.
It would be helpful to me. I am sure while speaking with Chang Light Speed many years ago he noted to not get fooled with detail that is noise and you will think the highs are rolled even though they are not, just the extra detail you have been used to hearing is gone.
Anyone bother to comment?
He is what I am using: http://cgi.audiogon.com/cgi-bin/auc.pl?accstwek&1235446406&auc&3&4&
Only used a 52 ohm resistor and BNC to terminate the clock input so far. I need to whip up a CONNECTOR (RCA?) to terminate the digital out. If the copper plug shield and ground wire make it much better I will not be able to stand it.
However, the perception is due to added spurious tones, and true detail, that involves coherent spatial integration of the sound, is suppressed. You will also notice that vocal sibilants are more natural when the electrical noise is reduced. The treble in general is less bright and in-your-face. The midrange will be less dry, and powerful male voices will seem less disconnected. The bass will be less vague. Sound-stage stability will improve, so that instruments will not seem to jump around depending on pitch and loudness. Sound-stage illumination of large natural bass instruments will improve.
RF noise is not directly audible, even if we had amplifiers and speakers capable of reproducing it. What we do hear are the intermodulation artifacts of repeated mixing of the signal with the noise.
Your post is not clear about which jacks to which you are applying the 75-ohm terminators in your link. The link describes RCA plugs, yet the coax digital output on your player appears to be a BNC connector.
Loading the digital output should reduce internal noise if you are using the device as a player and not a transport. Loading the single-ended outputs with 75 ohms may or may not be a good thing to do.
I am using the 75 ohm terminator on the COAX Digital Out. The other terminator goes on the BNC (external clock input). See: http://www.youtube.com/watch?v=piPI_ByD0Q0&feature=channel_page
Note The digital coax output that I used the 75 Ohm Terminator on.
Your feedback is always welcomed!
Terminating both ports is a good idea.
I'd be a little concerned about the stability of the copper sleeve's soft contact with the metal casework. I'd also try a connector with carbon fiber covering instead of copper, or with the copper outside the carbon fiber. Try a wired connection through a resistor to the casework (about 100 ohms) for the copper sleeve.
Connecting the player to AC safety-earth may introduce a ground loop if there is another component in your system that has an earth connection.
No ground loops at all, just a sudden clarity to the reproduction, I was surprised myself after trying it. The effect was immediate. In fact doing them all takes the player to a much higher level and that was a shocker to me due to my enjoyment of the SA-7S1 as it was.
In fact all cdís and SACD sound night and day better and different, like a wall of noise has been taken away leaving just the music in tact in the right balance, and your right imaging is more stable, the definition with a stand up bass is so much better, you can now feel the fingers hitting the strings with real definition instead of just the sound of the bass.
Highs have more body to them and shimmer with natural detail and they stay in their place instead of being pushed forward with sizzle. This one the one area that I struggled with, at first things seemed rolled off, but then I realized things had become more quite and more natural and real sounding.
Vocals have body to them and greater definition. This also takes some getting used to because before vocals were more forward, now the depth of field and width have a foundation and true placement to them, as well as hall and studio environments.
These tweaks were the best bang for the buck that I have ever come across and this is what makes A.A. so good, sometimes you can share real improvements with each other.
The grounding seemed more helpful than the shorting. I haven't done the copper sleeve trick. I don't believe I have much RFI in my environment....
You must terminate both the BNC and the coax digital outs...this will lower the noise floor dramatically. This is a cheap tweak.
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