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 120 "k" of what (watt.. get it?) |
Posted by GranPa
on Saturday 16 June 2007, 02:28PM
Don't talk rubbish.
90 Kilowatts of audio (RMS) would, if the speakers etc were 100% efficient, require 360 amps from a 240 volt domestic supply.
Allow for typical efficiencies of audio output stages, and thermionic valves are the worst having a very high impedance, you are looking at taking close to 1,000 amps from the mains supply, and a large percentage of this needs, by definition, to be routed to loudspeaker systems maybe between 2 to 8 ohms impedance, so do the maths children.
Seeing as a domestic main company fuse is 60 amps with commercial buildings usually restricted to 200 amp fuses, anyone with more than a brain cell and an education can tell you... forget 120kw of 'sound'.
In 1972 a Pink Floyd OPEN AIR concert in Venice or similar was halted as the closest buildings were suffering from structural damage from the noise.
The amplifiers at the do were "reportedly" 20kW.
If it isn't RMS (look it up!) it isn't true power.
With catalogues claiming 200 watt amplifiers for laptop PC's and all they need is 4, AAA batteries, do you expect to get 40 AMPS from an AAA cell for more than 50 milli seconds?
get real. get educated.
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| Chill out GranPa |
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| get used to modern pa stuff |
by julandchigo
on Wednesday 17 October 2007 @12:46AM
i am using a crest 10004 amplifier which brings two times 2800watt rms 20hz-20khz 4ohm.(3db headroom)
so one amp brings 5600watt
so i need 22 of these amps to reach the 120kw.
the power supply is quite easy with a generator with the size of 5x2x2 meters which give u 120kva.
there is also the crest 10001 which provides 10000watt into 4ohm or even 15000 into 2ohm.
the link to the HP
http://www.crestaudio.com/products/browse.cfm/action/detail/cat/340/item/116240/number/CFA-10001-AG/Pro10001.cfm
we use 15inch speaker from rcf which have 800watt rms, 1600 musik programm, over3000 peak power.
so where is the problem?
granpa get used to the new century, PA isnt the same than in the 70`s.
if there is a reson to use 100kw is another question, because its only 3db more loud than 50000watt system or 6 than a 25000w system.
its also a question of the frequency, 100kw into 30hz make you feel a little cold from the wind but 100kw on 150hz will knock you out, and on 1khz you will never hear anything else.
but DnB is quite deep, the rearloaded bass scoops are unifficent compared with frontloaded folded horns or hybrids like the vented horns (w-bin) so you can put ........power.
excuse my bad english but i am from the continent.
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| Some basic electrical knowlege needed I think! |
by Moo
on Friday 22 February 2008 @04:32AM
Large venues don't use a domestic 240v 13amp supply.
I have worked for the royal shakespear touring company which every week instals a 100kw lighting system and 10 kw sound system into sports halls up and down the country.
They use 3 phase 450 volt supplies which are installed into the venues for this type of use. You could comfortably power a 90k sound system from a single 125amp 3 phase socket with plenty of power to spare.
P.S. It's not clever to rant about subjects in which you are clearly clueless.
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| Mixing phases in sound systems? |
by Chris Fresh
on Saturday 23 February 2008 @12:12PM
Hi,
Quickie for you...
I was always of the impression that using more than one phase of the three phase supply for a single PA setup resulting in things going bang?
Is this not the case?
cheers,
Chris
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| Agreement that Valve isn't "all that" |
by saul Busby - Cozic
on Tuesday 27 January 2009 @05:02PM
i tend to agree. Ive seen valve sound system in sheffield before, and i think it was one of the worst pro systems ive ever heard. There was not much midrange, boomy bass, and cancellation all over the place.
120kw is a ridiculous figure too. And dillinja didnt build it all himself.
Good sounding systems are ninebar, dirt, etc.
Also jump up drum n bass is shite
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