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 Clif Design cdx20A Legal to run in 0-600?

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dooski
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PostSubject: Clif Design cdx20A Legal to run in 0-600?   Sun Apr 28, 2013 4:33 pm

Hey guys I had a chance to pick up a Clif Design cdx20A to play with and I was curious if it is legal to run in 0-600? Its rated at 25@4 and I read somewhere that usaci requires it to be ran as a 1k@4 amp. Is this true?
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chrisbaldelli
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PostSubject: Re: Clif Design cdx20A Legal to run in 0-600?   Mon Apr 29, 2013 8:56 am

All the specs I've seen show that it's 25 W RMS @ 4 Ohm, 3600 W RMS @ 2 Ohm. 2 Ohm stable.

Per the rules, it's equivalent to an 1800 W @ 4 Ohm amp.

Looking at the size of the footprint and number of FETS, it's pretty safe to say that someone will call you out if they see it. I certainly would. A number of amps may put out the same power, but the rules structure is setup in a way that allows this (for better or worse). It's still a useful amp for developing a competitive system. Once you get everything dialed in, swap it out for a "real" amp.
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PostSubject: Re: Clif Design cdx20A Legal to run in 0-600?   Mon Apr 29, 2013 1:01 pm

Great thanks for the reply! When you say ''Per the rules, it's equivalent to an 1800 W @ 4 Ohm amp" which rule or rules are you referring too? Do they now just half-down from the highest rated wattage and lowest rated load to get the 4ohm rating?
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chrisbaldelli
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PostSubject: Re: Clif Design cdx20A Legal to run in 0-600?   Mon Apr 29, 2013 1:11 pm

They take the largest of the numbers:
4 Ohm RMS rating
1/2 * 2 Ohm RMS rating
1/4 * 1 Ohm RMS rating
1/8 * 1/2 Ohm RMS rating (never seen this used against anyone)
...

If multiple power ratings are published, use the highest voltage that's under 15.5. That's why I calculated using the 14.4V rating instead of the 17V rating of 4000@2ohms.
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