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In Reply to: RE: Jim Smith, author of " Get Better Sound "... Tip 145 posted by drlowmu on November 06, 2015 at 19:10:06
When we first started using dolby A in our studio everybody felt that we were losing high frequency response. But when we took measurements the response was flat. Turn out to be a psycho acoustic effect. When you totally got rid of the noise things did not sound as good. We got rid of Dolby A and started recording at 30ips. My system is dead quite yet it is the best system I have heard in my house. I think that feeling that the quiet system does not sound that good will change with long term listening.
Alan
Follow Ups:
> When we first started using dolby A in our studio everybody felt that we were losing high frequency response.
As a matter of curiosity, did you find the same when using dbx sound reduction in your studio?
I have the impression that this much simpler noise reduction system is, at least in theory far superior to Dolby. It completely failed to catch on commercially in the domestic market because you NEEDED a dbx decoder to have listenable-to music - whereas Dolby was acceptable without a decoder (though its benefit was lost).
I had a cassette recorder with a dbx circuit that played back with much less tape hiss than Dolby and I could use its decoder to allow playback of my handful of dbx-encoded vinyl. I still have the vinyl - the cassette recorder is long-since gone.
Peter
The effect being discussed here is one that encompasses both filling of quiet passages with 60/120 Hz hum and noise, and the generation of intermodulation products that create a sense of fullness in undereducated ears. Both of these undesired results are artifacts of defective power supply design.
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Buy Chinese. Bury freedom.
So the ears and brain are "used" to hearing background level noise and IM products? And the lack of them makes the music sterile?
Right? Thanks!
Yes, and for evaluation purposes it's important to not only listen, but also think about what we're hearing. Not everyone is capable of that.
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Buy Chinese. Bury freedom.
You forgot to add that the listeners who like it otherwise are UNtrained and inexperienced.
Believe that, and I have an island in the Mekong Delta for you to purchase.
JM
!
The Mind has No Firewall~ U.S. Army War College.
What separates live music from hi-fi playback is a lack of realistic dynamic contrasting in the later, as it was originally played.THAT dynamic contrasting needs to be the design goal, the KEY guiding principle, in all SET designs.
Not " dead quiet ".
Any amp that is dead quiet, will NEVER be dynamically acceptable, they are mutually-exclusive design goals.
Your "dynamic amp" with 43 uF nicely addresses only one third of a troika. Good, I am very glad to hear you did it.
BUT ...Besides (1) as little capacitance as possible, you ALSO need (2) less magnetic storage in the chokes, and (3) WAY better wiring, ( transfer efficiency, wideband ) to get all three parameters optimized - and to approach the live event's dynamics.
I am not trying to attack you. Very few have figured this out, what I am discussing herein. Wish we could A-B amps in your digs one day. I am just sharing what I have discovered, with over 33 years of DHT amp building.
Regards,
Jeff Medwin
Edits: 11/11/15
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