A rather strange woofer test!

[Rubycon]

http://www.youtube.com/watch?v=3IelU7FpGUA&

Of course the best test (like this) would be in a pool of salt water.

What I would like have seen them do is use a real amplifier (5+ kW continuous power at speaker impedance). The thermal limits of the voice coil would be greatly augmented with water submersion. Also the damping should reduce overexcursion that such power would cause (basically exceeding XMECH for a few mS does permanent damage). Shallow submersion keeping water around the voice coil where waves could be more readily observed as well as infrasonic wave propagation, etc. Fresh water would be ideal since even a four ohms this is a high voltage test. If the woofer survives all that then a very high power test (30kW) of short duration (<10mS) impulses would be neat too. In air this can do some very strange things (dangerous!) to drivers.

 

[sdifox]

there are cheaper ways to make ultrasound cleaner.

 

[GodlessAstronomer]

 

[GodlessAstronomer]

I hate that fucking song. Sublime sucks so god damned hard.

 

[alkemyst]

I hate that fucking song. Sublime sucks so god damned hard.

I have come to the conclusion that you hate just about everything.

 

[GodlessAstronomer]

I have come to the conclusion that you hate just about everything.

I did used to enjoy the song when I was a stoner but these days it just makes me think of wasted years and friends who continue to waste their lives.

 

[alkemyst]

lol your wasted years? arent you still in college?

you haven't even lived yet and have grumpy old man mentality.

 

[GodlessAstronomer]

lol your wasted years? arent you still in college?

you haven't even lived yet and have grumpy old man mentality.

Being a douche as usual I see. I'm talking about my teen years where I dropped out of high school and wasted a lot of time working shitty jobs and wasting life. This is getting a little off-topic.

 

[alkemyst]

Being a douche as usual I see. I'm talking about my teen years where I dropped out of high school and wasted a lot of time working shitty jobs and wasting life. This is getting a little off-topic.

Not a douche at all. Why is that always the response when one disagrees?

Seriously though the average college graduate comes out at about 23-24 today. Many are still at home until 30+.

I don't think you are even 22 yet...at least based on your posts anyway.

Yet just about everything most find at least entertaining you seem almost physically hurt by it.

I don't get if you are trying to portray this or truly feel it.

 

[GodlessAstronomer]

Not a douche at all. Why is that always the response when one disagrees?

Seriously though the average college graduate comes out at about 23-24 today. Many are still at home until 30+.

I don't think you are even 22 yet...at least based on your posts anyway.

Yet just about everything most find at least entertaining you seem almost physically hurt by it.

I don't get if you are trying to portray this or truly feel it.

I'm 25 and haven't lived at home for several years.

 

[alkemyst]

I'm 25 and haven't lived at home for several years.

damn still young, you really haven't wasted life you really having lived yet then.

I'd have pegged someone that feel into a drug crowd, dropped out of school and then returned to be a bit more seasoned.

I had you pegged fresh out of high school.

 

[Rubycon]

there are cheaper ways to make ultrasound cleaner.

ultrasound &#8800; infrasound

awww cute pups!

... This is getting a little off-topic.

Indeed.

 

[sdifox]

ultrasound &#8800; infrasound

you know you can feed ultrasound signal to that underwater woofer :sneaky:

 

[Rubycon]

you know you can feed ultrasound signal to that underwater woofer :sneaky:

And it will behave essentially the same as feeding it DC.

A woofer than can handle a square wave. That's what we need.

 

[sdifox]

And it will behave essentially the same as feeding it DC.

A woofer than can handle a square wave. That's what we need.

water will dampen it

 

[Rubycon]

The cooling of the voice coil to prevent it becoming a fuse is rather interesting. Monitoring current is a good way to see how hot it's getting. With thousands of gallons of water surrounding it temperature won't get hot any time soon!

Heck mount it in a seventh order bandpass box!

 

[sdifox]

The cooling of the voice coil to prevent it becoming a fuse is rather interesting. Monitoring current is a good way to see how hot it's getting. With thousands of gallons of water surrounding it temperature won't get hot any time soon!

Heck mount it in a seventh order bandpass box!

coming soon, boombox aquarium.

 

[Krazy4Real]

Is it cold with solution?

 

[Rubycon]

Is it cold with solution?

Well when one considers voice coil temperatures can exceed +350C under heavy drive even boiling water would be considered a cold solution.