effects of bass on light

[Clipped]

what causes the TV monitor at a drive through window to jiggle and bounce around when you look at it when playing heavy bass?

i know it is not really moving... is the bass causing the wavelength of light to be diffused via the jiggling eyeballs?

why dont other types of light behave this way? for example a stoplight...

someone else please tell me youve seen this too...so i wont think im crazy after all these years...

[coloradosound]

You are much closer to the drive thru sign than you would be to
a stop sign. Just think, the music would be much louder closer
to the sign and the windows on those are much larger and more
flexible than the lenses on a stop sign also.

[jneutron]

Originally posted by Clipped
what causes the TV monitor at a drive through window to jiggle and bounce around when you look at it when playing heavy bass?

i know it is not really moving... is the bass causing the wavelength of light to be diffused via the jiggling eyeballs?

why dont other types of light behave this way? for example a stoplight...

someone else please tell me youve seen this too...so i wont think im crazy after all these years...

It's the wires you are using. There is an issue with the temperature of the wire.

The solution is simple...replace the heavy guage wires you are currently using, with a twisted pair of #32 Magnet wire..

The time it takes for the system to stop this effect will depend on how loud you play it.

When the wire reaches 1062 degrees C, you will no longer notice the effect.

Cheers, John

ps..either the monitor is vibrating, or your speakers are broadcasting enough magnetic field to affect a CRT. (not a field issue if the display is plasma or LCD.

[Clipped]

no no, when you go through a mcdonalds and you look inside the window and they have that monitor that shows the cars drivng up...not the plastic sign.

maybe i am crazy...c'mon you guys have had to have noticed this before...any crt actually...

the monitor isnt vibrating, because i actually asked a drive through employee one time if the picture on the monitor was shaking... maybe it has something to do with the refresh rate.

but this also happens at intersections with countdown timers, i can see the numbers jiggling around...

maybe this: the light from the crt hits the windshield and gets diffused by the vibrations of the bass? cant remember if this happens without going past the windshield first...

[ppia600]

Maybe your eyeballs are being pressurized from the bass notes and its affecting the lenses haha! Just kidding. Yeah mine does it too, not sure if its emf or vibration but I would sway towards vibration since you really don't know how well the monitor is mounted inside the sign. Also, the body of the vehicle is metal and is going to shield a lot of the emf from the speaker wires and woofer coils. Anyone else know for sure???

[jneutron]

Originally posted by ppia600
Also, the body of the vehicle is metal and is going to shield a lot of the emf from the speaker wires and woofer coils. Anyone else know for sure???

As I said, the magfield of the woofers can modulate CRT's.

The autobody panels that are NOT plastic or glass, are certainly not designed to confine solenoidal time varying magnetic fields.

Given a 1 to 1.5 tesla flux in the magnetic circuit of most high power speakers, the saturation of the iron causes a lot of the audio-signal-produced magnetic field to leak out of the structure into the surrounding air.

This is a common problem for particle accelerator magnets. Iron is only effective at confining the flux below 2 tesla, afterwards too much energy slips into the surrounding space. MRI's are also bad in that respect, that's why you are not allowed to bring iron into the room, and why girls aren't allowed to wear mascara or eyeliner (eddy current heating).


Cheers, John

ps..perhaps I should have stated that I do indeed know this magnetic goop. Also, I've watched my own speakers modulate CRT's. The old ones weren't as bad, as they were higher voltage due to the old phosphers, so were not as susceptible to external fields...the newest ones have lower voltage, so require less field strength to scan..

[richie00boy]

The reason is the refresh rate on the monitor modulates with the vibrations to your eyeballs caused by the bass. You can recreate the effect by shaking your head around a bit while watching TV.

[jneutron]

Originally posted by richie00boy
The reason is the refresh rate on the monitor modulates with the vibrations to your eyeballs caused by the bass. You can recreate the effect by shaking your head around a bit while watching TV.

Interesting thought. I discount it because he stated stoplights were not affected. Perhaps you are onto something..

Have you (the OP)noticed the effect when looking at newer taillight assemblies at night? The LED based ones are pulsed at a duty cycle when the parking lights are on, not when brakes are applied., and would also show the effect if it's strictly as you suggest. (alas, I do not know the pulse rep rate nor duty cycle for the taillights, but I'd think somewhere in the 20 to 60 hz regime.)

If it's visible on LED parking lights, you are correct and I am incorrect. If it's not, it may be that I am correct. (hey, it sometimes happens..):-)

Interesting..nice observation, though..

Cheers, John

[Clipped]

no no no... its not the monitor vibrating or the emf coming from the magnets, its how our eyes receive the perception of that type of light when the bass is shaking us.

anyone who is not sitting in the car, will not perceive the jiggling monitor...because they are not directly coupled to the car, as we are, when we are sitting down.

i guess you would have to experience it to see (literally)what im talking about...

maybe with this type of light , it is extremely focused through a narrow stream (omnidirectional), unlike a lighbulb which is dispersed...

[gootee]

Originally posted by richie00boy
The reason is the refresh rate on the monitor modulates with the vibrations to your eyeballs caused by the bass. You can recreate the effect by shaking your head around a bit while watching TV.

That was my first thought. You can also see a similar effect if you wave or jiggle your hand in front of a CRT monitor.