Re: Amps - Whats in em and why?
Posted: Tue Nov 12, 2019 2:15 pm
Personally I like just to piss about and learn something a long the way.
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Thats how you end up with opinions instead of anything close to evidence.Daniel Quinn wrote: ↑Tue Nov 12, 2019 2:15 pm Personally I like just to piss about and learn something a long the way.
I found that younger engineers tended to rely on what the computer was telling them rather than knowing how the system worked. In one case the computer regularly faulted an actuator, the real cause was that the output of the drive circuit had failed. Changing the actuator was a couple of hours work but changing the box took minutes.Lurcher300b wrote: ↑Tue Nov 12, 2019 11:53 amI have spent much of my working life fixing software and hardware, you can't fix a bug unless you know what's causing it. To do otherwise is to just cover it up and possibly give yourself twice the number of problems.That is an excellent example of intelligent troubleshooting, something I have found rare amongst some, so called, professional engineers.
Specification can be extensive and, to the uninitiated, confusing, more so if you don't actually know which bits are important to you. As an example, amplifier a has an output of 300 W into 8 ohms, amplifier b has an output of 50W RMS into 6 ohms, what is the difference? The fact is that they could be the same piece of equipment simply using a different means of measuring the output. Unsurprisingly, many people would put amplifier a higher on their list than amplifier b.keepitsimplestupid wrote: ↑Sat Nov 16, 2019 9:39 pm Anything beyond a specification and materials list in an advert is hyperbole, including descriptions of the sound. Nva pricing structure would fall into this category if we're being strict.
Even then its close to meaningless, all its telling you is how much power you would not want to be getting from the amp. Lets say it produces 0.1% distortion at 50W into 6 ohm. Ok, does that tell you anything about what it does at 45W into 6 ohm?You need watts load and distortion all together to form part of a meaningful spec.
I agree.Lurcher300b wrote: ↑Sun Nov 17, 2019 11:24 amEven then its close to meaningless, all its telling you is how much power you would not want to be getting from the amp. Lets say it produces 0.1% distortion at 50W into 6 ohm. Ok, does that tell you anything about what it does at 45W into 6 ohm?You need watts load and distortion all together to form part of a meaningful spec.
Also, you need a frequency adding to that, 50W at 1kHz into 6Ohm at 0.1% distortion. Even then doesn't tell you anything about 50W at 50Hz or 10kHz
Also real loads are not resistive, test ones normally are.
Also real signals are not single sine waves, some test ones are. At least for the above spec.
And so on.