I have had much more of this attitude in relation to my phone or computer. (In the case with the computer, it was not even about the computer itself, but about a screenshot posted in which a "classic" desktop theme appeared, similar to that of "Windows XP Classic" - From where the guy deduced himself about an old computer). After all, everyone and even those guys have limited capability of attention, and most of them waste it all on the few gadgets they feel very important with (phone, computer, car, clothes) and there their capabilities end. Much fewer of them would notice lighting... Here you found one

On unrelated note, the detector control protocol gotta be quite poorly thought out if the interference from a single frequency of an HF ballast (that works at close frequency to that of IR remotes, but does not carry any modulated signals) not just jams the remote (this is quite common) but actually gets it to do actions. I wonder what it would do if fired at with a few different TV or other appliance remotes.... If this happened with a magnetic ballast then im at a loss completely in regards to the design of this detector

I've had comments made about the fact that I have an actual hi-fi and home theatre setup. I get commets like "hi-fi? is it still the 1980's? I use youtube on my phone now". Getting decent TV stands with room for multichannel preamps and power amps is getting hard to come by now since most people use shite soundbars now!

I'd rather have a pair of JBL Control 1s with a cheap amp than that one of those soundbars.

Some sound bars are pretty good now and you cannot fault their convenience. A proper surround setup will likely always be better but not everyone wants (or can fit) cables and speakers everywhere

yep soundbars are better than they used to be, but for what they are still overpriced and mis-speciifed. for example i was in tesco the other week and seen jvc one, it stated on the front 300w output, then i look at the power consumption label on the box and its 100w? no soundbar will perform as a proper hi-fi setup

They forgot to write PMPO. (Who writes that anymore ? Is it still the 80s ?)

Most cheap audio equipment usually is sold on how many watts it is (or rather, isn't), not just soundbars. As with anything you get good and bad ones.

I still find it funny when I go to Currys and see small Hi-Fis that say stuff like "600w" and in the manual it will say a more true rating like 50w RMS.

the best one i seen is / was a car amp its advertised as 10000w but only has two 30A fuses.

They advertise the power ratings as peak power which is probably only for a few miliseconds instead of true continous RMS power.
Lol 10kw at 12 volts... that's like 800 amps.
Saying that though, I have seen car stereo installs that have drawn so much power that the windings in the alternator have burned black!

Ones like that can be detected from afar, their headlights are dimming in a rhythmic pattern...

the headlights dimming is very familiar, i used to have this problem on a few cars

rms power is the root mean square of peak power. rms x1.414 is peak, rms x 2.828 is peak to peak. if an amplifier has dual 50v supply rails the maximum output voltage and therefore power cannot exceed 100v p-p

There is more to it then x1.414...

RMS is the root mean square of multiple samples of the value (of the current, voltage, power etc) taken over some time over which we do the "averaging" (assuming the samples are taken in a "fair" way to represent all what's going on). For sine voltage or current, the RMS of what goes over one cycle happens to be 1/sqrt2 (1/1.414) of the peak value

For AC circuit with sine wave, the RMS voltaege is 1/sqrt2 of the peak, the RMS current is 1/sqrt2 of the peak, and for both the signal is AC so the PTP (peak to peak) is double the peak. The RMS power is then 1/2 of the peak power (VxI = 1/sqrt2 x 1/sqrt2), and as power is positive throughout the entire AC cycle, the PTP value is same as the peak and not double

For anything else you must evaluate what is really going on, there are no generalized rules...

If you are delivering a sine audio signal through an amplifier powered with DC, then the voltage stays constant (disregarding voltage drop), and current draw at the amp input is the rectified output (disregarding losses and storage in capacitors etc). So the peak would be the peak current, the RMS would be the 1/sqrt2 of the peak, and since the current never goes backwards (the amp does not regenerate back into the battery) the negative peak of the current is 0A. In this case the PTP is simply same as the peak. As the voltage is constant, the power behaves the same as the current

If there is some smoothing of the power draw at the amplifier DC input (say by a huge value capacitor), the positive peak current will be lowered to some extent as part of it will be delivered from the capacitor (and not from the DC input), and the negative peak will be above zero (i.e. still positive) as when the amp itself does not draw current, the cap is drawing current for recharging. In this case the Average current will stay the same, but peak will be lower, PTP lower, and RMS also somewhat lower (this is because of the square in the equation, which makes the effect of the peak more pronounced in the overall result. RMS is not the same as Average)

Also, audio signals can have peaks which far exceed the RMS x sqrt2 value. Although (depending on the specific sound) they may be far inbetween, so not affect the DC supply in an "overloading to overheating" sense, but if it is unable to deliver the required power, there will be a momentary voltage drop, that will lead to distortion in the sound and maybe affect other devices powered from the same supply

I do like a good set of speakers. I used to have subs and amps in my cars, there used to be various car audio shops around they are all gone now as modern cars have the nav and speakers all part of an ECU with cambus I really wanted to get some better speakers in my van as they are shit but nowhere to ask anymore

all good i am rusty with theory its been over 20 years, you can get aftermarket speaker kits for vans there are loads on ebay but some expensive

I used to have a 12 inch Bass tube and a couple of power Amps in my Escort. It wasn't really for the volume, it was more for better sound at normal levels, though I did crank it up sometimes! I was in my twenties then, I've kind of grown out of it now. I would always replace the Audio system as soon as I got a new car. I haven't bothered for the current car or the previous one, the stock systems have been good enough. The amps and speaker used to be absolute rubbish. And of course there is the problem of the head unit in my current Honda Civic being so heavily integrated electronically that I would lose other functionality if I was to change it.