Zaphod Beeblebrox

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About Zaphod Beeblebrox

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    Rabid Greenieâ„¢
  • Birthday 08/04/1953


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  1. Aditec was an Aussie company, operating during the 1970s and early 1980s. They built amplifier modules, which many companies used in their products. The design was pretty simple and based on the classic RCA amplifier designs from the early 1970s. Nothing to write home about, but honest enough.
  2. Read what Pete has written. The fault described is not likely to be capacitor related, though replacing the caps will likely improve the sound quality AFTER the real fault has been located and repaired.
  3. "Dynamic power" favours amplifiers that use small power supplies. A small, crappy Yamaha/Marantz/whatever will perform better under such conditions than a Krell, ME or Mark Levinson.
  4. ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ This is the best information posted on this thread. It should be read and understood.
  5. I've listened to a number of pipe organs (live). There is not a snowball's chance in Hell that the sound they make is even remotely close to being a sine wave (I've listened to A LOT of sine waves over the years). The reasons are obvious: * The part that makes the noise is actually a kind of whistle. * The pipe, itself, will vibrate, adding more harmonics to the mix. * Nearby objects (other pipes) will also contribute their own sound.
  6. @steve u How goes the comparison?
  7. Of course it does. ALL non-electronic instruments (and the vast majority of electronic ones) possess copious amounts of harmonics.
  8. The human ear does not 'shut-off' at 20kHz. 20kHz is considered the normal hearing limit for a healthy young adult with average hearing. Some can hear higher frequencies than this figure. Some cannot. Either way, with sufficient intensity, most healthy young humans can hear frequencies much higher than this. For my own part, I once worked at a service department, for a large company, that also had a separate warehouse. When I first tried to enter the warehouse, I felt very uncomfortable. I finally figured out that the ultrasonic movement sensors for the alarm system were causing the problem. I grabbed a mic, preamp and frequency counter and measured the noise. It was around 27kHz. That said, few instruments possess any upper harmonics past 20khz, so it's a moot point. Oh, they certainly can. Even many young adults can. All of which has nothing to do with the emotion felt by listeners.
  9. That's because the emotion instilled by listening to the music has less to do with high fidelity and more to do with the listener's feelings and the performer's abilities. I get similar feelings listening to my car stereo (which is not very good). It pretty much is. You can't hear anything above 20kHz and you can't hear anything below 20Hz (though you can feel it). However, as I alluded to earlier, for systems that possess a gentle roll-off beyond 20khz, there can be some serious phase response problems within the audible range, which can be very audible, unless they can deliver well beyond 150kHz.
  10. Whilst there a couple of small advantages to vinyl over 16/44 digital, those advantages are rarely utilised. The standout recordings, IMO, were from Sheffield Labs and other 'direct disk' recordings. As for the popularity of vinyl, I believe a large part of the attraction is the process surrounding the playback. It's a bit like the Japanese tea ceremony. The tea is incidental to the experience. Perhaps not quite, but you get the idea. FWIW: I have a large vinyl collection and several turntables. I enjoy vinyl.
  11. Obviously. The better the room, and the higher the performance of the reproduction equipment, the closer one can get to the original performance. A bunch of squiggly lines. I rarely use any of my oscilloscopes for such a purpose. That's not what they are really useful for. That's because I said no such thing. Quote me precisely or not at all. Your opinion is duly noted. IME, many listeners do not have optimally set up rooms. Again, your opinion is duly noted. IMO room treatments are vastly under-rated. A properly damped room makes a HUGE difference to any system. Why? Such a thing would be pointless. The whole idea of setting a room up properly is to eliminate as many reflections as possible.
  12. What do you find confusing? I will attempt to clarify. You may disagree all you wish. Unless the 'emotion' is in the original performance, then a hi hi system can do diddly to fix it. It could be the best hi fi system in existence, but if the performance is crap, then that is what you will hear. It's all about the performance. And the listening room, of course. Of course. A high quality system will do just that, PROVIDED it is in a good room. The room being the most important part of any system. Depends on the player and the performance. Certainly, CD players improved significantly through the 1980s. Again, nothing to do with frequency response.
  13. The answers related to the banality of the questions posed. Here is what is required to preserve accurate sound staging is a reproduction system (in approximate order of importance): * The room * The room * The room * The phase accuracy of the speaker system. * The phase accuracy of everything else in the system. * Correct input/output impedance matching (minimum 100:1). * Correct setup of LP playback if used. The frequency response, per se, is not a particularly important parameter. hence my response to your question. Of course. Of course. An iPod is not hi fi. It is, at best, medium fi. Way too much missing. It is less to do with frequency response, per se, and MUCH more to do with phase relationships. And again: It is the performers who insert emotion into music. NOT reproduction equipment.
  14. Fake news alert. "Dynamic conditions" is a meaningless term. Much like the much maligned 'peak power wars' of the 1970s. Power is measured continuously. "Dynamic conditions' can mean pretty much anything. Under VERY short term demands, even a very humble amplifier can deliver seemingly huge amounts of power. Continuous power ratings, or those that reflect meaningful time periods (say, several seconds) are the only ones we should take notice of. Having said all that, I am not saying anything good or bad about the Devialet. I've heard one and it is as good or better than many linear amplifiers, but not, IMO, as good as the very best linear amps. I have to say that the load was extremely tough. Kg for kg it is one of the best amplifiers available anywhere. It is drop dead gorgeous too. Was the output impedance measured from 20Hz ~ 20kHz? Few manufacturers provide this invaluable data. The figure mentioned is about the same as a 1970s vintage Phase Linear, so it is not all that exciting.
  15. All of them. All of them. All of them. Perhaps you should wait for the answer. I'm 63 and I know that I can't hear stuff I heard in my 20s. I am not amazed, just sad that I can't hear the stuff I once could. Emotion is created by the performers, not the reproduction system.