Understanding is understanding. Including understanding written words (which sometimes requires a skill for "reading between the lines"). I wrote:
There is a reason why "cable sound" was in quotes.
Only ears (and of course accurate tools) can tell whether we are already in that IDEAL circumstances or not. And it is "not" about the cable (which suppose to have no sound) but about amplification system who has no idea what it suppose to amplify and what should not.
You are right. The main approach should be "good engineering". My first approach is to attack the problem (interference) from it's source or transmitting end instead of letting it in then solve it from the receiving end... If you read this site, you will see people having problem with hum and buzz... OMG... if people cannot solve that basic stuff, how can they solve other problems where symptoms they can not see nor hear??? (And often there is trade-off between different problems??)
They do to some extent. I get around that by jacking up the signal voltage at the input (X5), and then attenuating it at the output (1/5), which pushes the noise floor way down. This is how I get away with putting 10 or so opamps in the signal path. When you consider that it only takes a volt or two to drive virtually any power amp to clipping, and you've got 15 volt rails on the opamp, there's a lot of room there to push noise and crossover distortion way down. It would be foolish not to do this. I have to put my ear right up near a speaker, with no program playing and no other noise (refrigerator?) to hear any noise. It's not a problem.
Some fancy speaker wire is better technically, but the improvement is microscopic. It's a fools game. If we were talking frequencies above 500kHZ, I'd say yes, let's worry about it, but not at audio frequencies.
I thought that electric signals travelled at near the speed of light
Are AF eclectic signals 😕
Yes. But when we cannot improve further on the amplifier side... Or the wire is cheap... Or the system bottleneck shifts to non-critical area/stuffs...
The noise I was talking about is not such noise that you can hear with ears close to speaker. It's like a noise floor. It's a noise that you know is there when the transparency suffers, such as low level details masked by noise.
I think there is a mechanism where this HF-related problem beyond audio frequency can "modulate" signals within the audio range.
system connection question
I want to connect my OPPO BDP-95 directly to my amp and want to connect the other sources to an Audible Illusions M3A which would be connected to the same amp. I am thinking a Y connector connected to the amp inputs might work. Please see my attached sketch and let me know if it will work?
Thanks,
henry
I want to connect my OPPO BDP-95 directly to my amp and want to connect the other sources to an Audible Illusions M3A which would be connected to the same amp. I am thinking a Y connector connected to the amp inputs might work. Please see my attached sketch and let me know if it will work?
Thanks,
henry
Attachments
It may, but it will not work well. Each component's output is a low impedance and will load down the other. You'll have low volume and increased distortion.
I plan to have only the component in use turned on. For example, when using the Audible Illusions preamp, the OPPO wil be turned off. Same thing when playing the OPPO, the other source components and audible Illusions preamp will be turned of. Will the problems you described still happen?
Thanks,
henry
Thanks,
henry
The only way I know of that energy above the audio range would cause modulation of the audio frequency energy, is when this very high frequency energy would cause slewing related distortions and/or get detected by non-linear devices, thereby generating I.M. and harmonic distortion energies. Most amplifier circuits are very clean up to 20kHZ, but beyond that, the open loop gain often falls off, often for the sake of a better phase margin, and by the time you get up to 100kHZ, there may not be much open loop gain left for the distortion correcting negative feedback function. The circuit could be significantly non-linear at 100kHZ. Any Rf noise coming in from a source could cause slewing related distortion artifacts, and I.M. difference frequency energy that would spew into the audio frequency range as apparently random noise. Digital sources and light dimmers come to mind, but also all the other Rf energy that is in the air these days (radio, TV, cellphones, Wi-Fi, etc.). Many digital music sources (CD players etc.) don't do a very good job of filtering out all of the Rf energy generated by the D to A conversion. I put a passive Rf filter at the input of everything I build. Cost is about a dollar for an R in series and a C to ground. I'm surprised how few circuits have this.
The heading of this thread is "Everything Else Anything related to audio / video / electronis ect)". Based on that I think this thread is the right place for my question.
In fact I started the question on an OPPO thread and was told it was the wrong thread and should be on a general discussion thread, so here I am.
The load given by a "turned off" piece of audio equipment is probably more indeterminate than if it's turned on.
Use a switch to select between sound sources, that they are also turned off when not needed is irrelevant.
No, that is the heading of this forum area. You may be in the right forum area, but definitely the wrong thread; this thread is about cables and how they can allegedly affect the sound. You should have started a new thread, unless you can find a relevant thread to tag on to.henrylrjr said:
Best thing is to ask the Mods to split this discussion into a new thread. Click on the red triangle and ask nicely.
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Thanks for helping me understand how to use this site. I also don't need a new thread because, based on responses here and elsewhere, I'm not going to use Y connectors.
I didn't know that other components, even when off, could effect sonics from a turned on component, when both share the same amp inputs.
Everything will go through the AI preamp and I'll use the OPPO remote when listening on the 1st floor. Based on OPPO's responses I think it will be OK. My ears are 70 years old.
I didn't know that other components, even when off, could effect sonics from a turned on component, when both share the same amp inputs.
Everything will go through the AI preamp and I'll use the OPPO remote when listening on the 1st floor. Based on OPPO's responses I think it will be OK. My ears are 70 years old.
I have just realised that the 'henrylrjr' who recently posted about connections in a cable thread is the same 'henrylrjr' who originally started the thread about cables. My apologies.
As a general rule, paralleling outputs can at best result in severe attenuation of the signal when both outputs are active (although not passing signal). Non-active outputs are quite likely to distort the signal, although in some cases they may simply do nothing at all.henrylrjr said:
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