Stereo system impedance?
- Thread starter YanKleber
- Start date
Ha!
Thought you'd enjoy this little poke at the subject- (a little 'tweak' for the Bogie 
fits right in..https://homerecording.com/bbs/equip.../ok-i-got-tone-thing-nailed-check-out-371518/
YanKleber
Retired
Cool, you put me in curiosity state. LoL. I will try it later today with my HIFI boxed speakers.
This is exactly what I think about gold stuff. The only reason why they use it is because it wont oxidize. Other than that there is no reason why the sound would get better unless by the psycowallet effect.
Dave, I use an old software called AudioGrabber with an external converter called 'Lame'. I used to encode my stuff in 128Kbps but then since some time ago I am doing it in 320Kbps but to be honest I can't hear any difference. I think that actually the alghorhythm of the encoder is too much more important than the bitrate itself. I have listened some 320Kbps encodings that are simply impossible to enjoy. I already listened all sort of weird effect like flange, phase, squashing, strange high frequency rings, etc, inserted into the encoding.
I have a big amount of MP3s that I download from web several years ago mainly of old 70s disco all in 128Kbps and they sound fine for me (within the limitations of the source of course). I have even MP3s here that were sampled from vinyl and that I think never were reissued in CD. No one of them suffer of the crazy effects mentioned above. By the other hand I never analyzed their stereo image, frequencies, etc. I am sure that an specialist would find a lot of issues, but for my years they sound good. As I said, though, I am not even close to be an audiophile. My ears and my pockets never were trained for this.
Indeed, and the proposers of this nonsense never supply a mechanism, testable by physics as how these effects might work. To those people, the claim that THEY can hear these things is good enough.
Electro-magnetism on the other hand makes the world go round! We all should at least have HEARD of Faraday. The test I just outlined is based on solid, electrical theory that keeps the lights on. The Audiophools can spout any untestable rubbish they like! ... But we must be wary!
Many decades ago the "scientific" music peeps poo-poo'ed the claims of sound improving turntable mats until a major hi fi magazine undertook some serious investigations and proved that some mats DID in fact damp out certain unwanted sounds on vinyl.
Only a couple of years ago a magazine conducted tests (not strictly scientific they would be the first to say) which threw up some very interesting and surprising(to many!) data regarding mic pre amps of a range of costs.
Dave.
Not quite sure what you mean there Mixsit?
A "perfect" amplifier, and the very best of solid state designs are close, would indeed have so low an output Z that it would not be bothered by the variations in the load (due say from changes in impedance with frequency) it would in effect be a perfect voltage source*.
Loudspeakers on the other hand, especially multi unit designs with passive crossovers, are designed under the assumption that they will be connected to effectively a short circuit (some have commented that much of the preference that valve amps seem to engender is due to the "looser" bass? Valve amps rarely have an OP Z much under one Ohm.)
*It is quite possible to negate even the DC resistance, or much of it, in the voice coil by giving the amplifier a negative output resistance. This uses a combination of negative voltage and positive current feedback and is thus not common due to incipient stability problems!
Dave.
bouldersoundguy
Well-known member
I've seen receivers with an impedance switch, putting 4 ohm speakers in series for A+B and 8 ohm speakers in parallel for A+B.
"Ha! Thought you'd enjoy this little poke at the subject- (a little 'tweak' for the Bogie fits right in..
https://homerecording.com/bbs/equipme...ck-out-371518/"
Thats rich! I work at the world's leading manufacture of hostile environment, high performance connectors and cables and I couldnt put that out with a straight face. LOL. But if someone is buying, more power to em, pardon the pun.
https://homerecording.com/bbs/equipme...ck-out-371518/"
Thats rich! I work at the world's leading manufacture of hostile environment, high performance connectors and cables and I couldnt put that out with a straight face. LOL. But if someone is buying, more power to em, pardon the pun.
rob aylestone
Moderator
I was at a seminar once, professional audio systems, hosted by Sennheiser, and they were explaining with demonstrations the differences between certain audio products. We had two different sound systems on show, next to each other, and one was BIG, while the other used a vertical column of very small speakers on a sub unit. They demo'd the small system - it was good, very good in fact. Then he went behind, pulled the plugs out of the CD player and swapped them. He stuck in a CD - Dire straits, I seem to remember - Money for Nothing. Turned up the volume and we heard the 'big' system. We then stopped and he asked us for single word comments on the difference. He then spun the BIG system around on it's wheels and there were no cables plugged in! All he had done was unplug the CD player and plug it back in. The source material did the rest - we all KNEW we were listening to the big system, not the tiny little speakers in the thin columns. Brain and memory worked together to convince all of us. Psycho-acoustics.
If you spent hundreds of pounds/dollars on something that takes at least a minute to wire in, your brain simply will not let you not hear a difference. I don't see the people who can hear what I can't as liars - I know my hearing is now gone higher than 16KHz, but 16-20KHz is a tiny difference on a piano keyboard, and I can still tell when material is lacking in HF sparkle. What I cannot accept are hi-fi 'staple favourites' that wave in the face of physics, or worse, bastardise physics by twisting it with a tiny dollop of physics and lots of surrounding rubbish.
Directional cables, and special cables that carry the audio on the outside of the cable - that one always makes me smile. It's true - but only at microwave frequencies.
The notion that you can hear a switch in the circuit just makes me smile. What properties could a switch actually have? Resistance. Possibly capacitance if the switching blades were very close together? Inductance - I can't see this one? What other property could have an impact?
If you spent hundreds of pounds/dollars on something that takes at least a minute to wire in, your brain simply will not let you not hear a difference. I don't see the people who can hear what I can't as liars - I know my hearing is now gone higher than 16KHz, but 16-20KHz is a tiny difference on a piano keyboard, and I can still tell when material is lacking in HF sparkle. What I cannot accept are hi-fi 'staple favourites' that wave in the face of physics, or worse, bastardise physics by twisting it with a tiny dollop of physics and lots of surrounding rubbish.
Directional cables, and special cables that carry the audio on the outside of the cable - that one always makes me smile. It's true - but only at microwave frequencies.
The notion that you can hear a switch in the circuit just makes me smile. What properties could a switch actually have? Resistance. Possibly capacitance if the switching blades were very close together? Inductance - I can't see this one? What other property could have an impact?
