iasca, idbl rules

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wotugot4me

Copper - Posts: 64

Joined: March 09, 2005

Location: United Kingdom

Posted: January 22, 2007 at 10:59 AM / IP Logged

Ok, this is going to sound like a really dumb question but does it say anywhere in any rule book what counts as an amplifier? Is there a rule to stop someone plugging there subs into a voltage transformer (because it does amplify) of 110v or in europe 230v? With some quick maths you can figure out that 230v = 13225 watts at four ohms (P=ExE/R) at a handy 60hz. Thats 13225 clean watts. Just wondered if anyone had ever tried to pull this off in a competition either legally or cheating???

jeffchilcott

Platinum - Posts: 2,483

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Location: United States

Posted: January 22, 2007 at 1:30 PM / IP Logged

I know in the USACI and DB Drag rules it states that power must be 12 volt in stock style classes and 16v in pro stock or modified classes, I know meca and Iasca have rules similar to this but dont know how they ahve it worded

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wotugot4me

Copper - Posts: 64

Joined: March 09, 2005

Location: United Kingdom

Posted: January 22, 2007 at 1:35 PM / IP Logged

Yeah, thats what i thought but technically your audio amp is taking 12 volts and outputing sound as ac voltage, and the transformer is taking 12 volts and outputing 110/230 volts so both are technically doing the same job, the audio amp varies frequency whereas the transformer doesnt.

DYohn

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Joined: April 22, 2003

Location: Arizona, United States

Posted: January 22, 2007 at 1:40 PM / IP Logged

AFAIK there is no requirement that you use any particular type of device as an amplifier, only the power source requirements as Jeff mentioned. So sure, go for it, try your transformer idea. I want to see how you get it to function off a 12VDC battery or alternator source and achieve anything better than standard audio amplifiers can produce..

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jeffchilcott

Platinum - Posts: 2,483

Joined: April 11, 2002

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Posted: January 22, 2007 at 2:58 PM / IP Logged

But you also have to remember that you will have to feed it a signal becasue in all organizations you can normally only use a tone of 80hz and below

Amplifiers produce not only AC voltage but also AC curent

You can have 110 volts but only have 20 amps of current and not have near as much power as say a ZX1500 Kicker

I know I can get roughly 150 volts with the amp unloded

You also have the issue of the signal you will be outputting....I can just see it on an O scope looking completly square, such as when you clip an amp horribly

This will cause alot of damage to your speakers and likely distruction

I know a few people have tried this and it has not been sucessful at all, I will dig on the USACi and Db Drag fourms and se if I can find it

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haemphyst

Platinum - Posts: 5,054

Joined: January 19, 2003

Location: Michigan, Bouvet Island

Posted: January 22, 2007 at 4:52 PM / IP Logged

And... a transformer doesn't make power! A transformer converts power. What this means is that in order for you to get your 13kW out of a transformer, you have to put more than that (due to losses inside of the transformer - maybe a few percentage points) into the transformer.

13kW/14.4v=902A

Now, for 14.4v to demand 902A, the primary side of the transformer must have a DC resistance of 14.4/902=.016 ohms. Good luck connecting that to ANY kind of signal producer or generating device.

So, you see, it simply is NOT going to happen with a transformer. EVEN IF you were going to drive your transformer with a (let's say) 100W amplifier, you will never get MORE than 100 watts out of the secondary side. The voltage WOULD be higher, but the current available would never be capable of maintaining that voltage - it (the voltage) would drop drastically, as soon as you connected your load (a 4 ohm speaker, right?) to it. You would still ONLY GET 100W out, into the speaker (minus transformer losses...)

It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."

wotugot4me

Copper - Posts: 64

Joined: March 09, 2005

Location: United Kingdom

Posted: January 23, 2007 at 9:50 AM / IP Logged

I never planned on trying it, just curious to see if anyone had or what the science behind it working or not working would be, what made me wonder was seeing someone plug a 15" sub into the mains outlet at the wall and seeing the sub go mental. Would the power to the sub be limited to the power of the transformer eg. a 200w transformer would not put out more then 200w?

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iasca, idbl rules

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