Will speakers in the bathroom kill me?
- Thread starter Rosco
- Start date
subversplat
writer of wrongs
I think he means "Don't say AMPAGE for fuck's sake."Markyd said:
HTH
Velouria
Long time lurker
You know, now, no doubt that's patented ... and I believe that there is specific provision in the patent act for an interested person to go grab the patents (hell you can download them nowadaysgentlegreen said:
Quad Electrostatics
Probably the least suitable speakers for the bathroom. The diaphragm bias voltage is several KV, but with no more current available than an ioniser, you can safely draw sparks off it with your finger.
The stators, however are driven by stepping up the audio with a transformer and grabbing hold of both stator wires while playing heavy dub, is apparently not recommended
.
) and build their own copy of any invention (you just can't sell it)...? Hmm
gentlegreen
I hummus, therefore I am ...
Velouria said:You know, now, no doubt that's patented ... and I believe that there is specific provision in the patent act for an interested person to go grab the patents (hell you can download them nowadays
Hmm
I own 3 pairs of these - two pairs (stacked) in my main room and one day I will get around to fixing my first pair and paint them white for the main bedroom.
It's a constant battle to resist buying a 4th pair - no doubt I may one day have to cave in and exchange my door-sized stacked quads for something a bit more domestically acceptable with a sub-woofer
I DO have a book on DIY electrostatics, but life's too short ..... headphones are relatively easy to make with perspex and clingfilm ....
Velouria
Long time lurker
Aww would you really?gentlegreen said:It's a constant battle to resist buying a 4th pair - no doubt I may one day have to cave in and exchange my door-sized stacked quads for something a bit more domestically acceptable with a sub-woofer
I'll be in your neck of the woods in July...
Here is the range of estimates for lethal currents through the heart: they range 60 to 200 milliamps.
I'll take 100 milliamps (0.1 amp).
It's ages since I built an amplifier, but:
A speaker has an impedance (equivalent for these purposes to resistance) of 8 ohms, yes?
So since V = IR (voltage drop = current * resistance) and Power in watts = IV, the voltage across a speaker delivering a healthy domestic 500 watts will be given by V^2 = PR or V-squared = 500*8; V = square_root(4000) =~ 66.6V.
The internal resistance of the amplifier will be less than this, yes?
So to deliver 100mA you need to get the combined internal resistance of the amp and resistance through your body down to ... umm... R = V/I = 66.6/0.1 = 666 ohms
This guide to IEE regulations says we can take the resistance of the body of a person sat in a bath as 200 ohms.
(It also gives a much more cautious "10 mA is seldom likely to prove fatal".)
Conclusion: if you sit in the bath and bite the speaker cable you can most definitely kill yourself on the amplifier output.
Probably the last thing you'll hear is the first beat of the bass kicking in.
Disclaimer: this is an example of back-of-an-envelope physics and not to be used for any other purpose. If you have the slightest inclination to try it, call the Samaritans; in the UK they are on 08457 90 90 90.
I'll take 100 milliamps (0.1 amp).
It's ages since I built an amplifier, but:
A speaker has an impedance (equivalent for these purposes to resistance) of 8 ohms, yes?
So since V = IR (voltage drop = current * resistance) and Power in watts = IV, the voltage across a speaker delivering a healthy domestic 500 watts will be given by V^2 = PR or V-squared = 500*8; V = square_root(4000) =~ 66.6V.
The internal resistance of the amplifier will be less than this, yes?
So to deliver 100mA you need to get the combined internal resistance of the amp and resistance through your body down to ... umm... R = V/I = 66.6/0.1 = 666 ohms
This guide to IEE regulations says we can take the resistance of the body of a person sat in a bath as 200 ohms.
(It also gives a much more cautious "10 mA is seldom likely to prove fatal".)
Conclusion: if you sit in the bath and bite the speaker cable you can most definitely kill yourself on the amplifier output.
Probably the last thing you'll hear is the first beat of the bass kicking in.
Disclaimer: this is an example of back-of-an-envelope physics and not to be used for any other purpose. If you have the slightest inclination to try it, call the Samaritans; in the UK they are on 08457 90 90 90.
sheothebudworths
Up the bum - no babies!!!
Keep up the good work gang!
I have nothing useful whatsoever to add, but this is my favourite thread atm, so I'm blatantly bumping it... 
I have nothing useful whatsoever to add, but this is my favourite thread atm, so I'm blatantly bumping it...
sheothebudworths
Up the bum - no babies!!!
Rosco said:The shower went ok, the tunes were fine, and I'm still here....at least I think I am
HURRAH!!!
pembrokestephen
New Member
Except that, to get 30 amps going through you, you need to be in circuit with a supply whose voltage is going to result in that kind of current passing through you. The current is TOTALLY dependent on the voltage and the resistance in the circuit, it's as simple as that.Markyd said:
I expect you're going to tell me you're a certified electrician, now?
london manz
New Member
the condensation gettin in the speaker and or speaker wires could cause it to blow it yea...but when i was younger i used to stick the telly on the toilet and watch telly in the bath and im still here/
alternativiely leave the bathroom door open and stick your beats on as loud as you can
alternativiely leave the bathroom door open and stick your beats on as loud as you can
ricbake
working out how
Great thread is Rosco still alive? - Is he deaf?
http://www.maplin.co.uk/Module.aspx?ModuleNo=221776&TabID=1&C=SO&U=strat15&doy=search
http://www.maplin.co.uk/Module.aspx?ModuleNo=221776&TabID=1&C=SO&U=strat15&doy=search
gentlegreen
I hummus, therefore I am ...
unless your bathroom is incredibly damp, just get some cheap speakers from the local car boot.
I briefly had a bass unit under my downstairs floor and had problems with slugs. I was thinking of putting a heater in it.
I briefly had a bass unit under my downstairs floor and had problems with slugs. I was thinking of putting a heater in it.
madzone
Physically unfavourable
Fab!
madzone
Physically unfavourable
It does get very steamy in thereunless your bathroom is incredibly damp, just get some cheap speakers from the local car boot.
I briefly had a bass unit under my downstairs floor and had problems with slugs. I was thinking of putting a heater in it.
gentlegreen
I hummus, therefore I am ...
I can't give solid advice as , whereas I've had a TV and radio in mine for years with no problems, I only heat a tank of water every couple of weeks or so and my window doesn't fit the frame properly ...
You could try wrapping them in clingfilm - my electrostatics are anyway ...
madzone
Physically unfavourable
Those maplins ones aren't that expensive and it's my b'day in april
Mind you, there's no guarantee that they're any good is there?Similar threads
