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Understanding the DB drag rules ...

Old 05-01-2010, 06:20 AM
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Understanding the DB drag rules ...

Having now read the DB drag rules ,I understand the great majority, but I have some q's for clarity.

Street stock B allows up to max 2000w. Total power output
Is that the total rated max rms power of ALL amps at their lowest stable impedence (All- including mid/high amps?) or is it the actual power put out at the impedance your running

So if your amp is rated at 1000w at 1 ohm but you're running at 2 ohm and 500w , does it still count as 1000w or the actual output

A high/mid amp of 4X150 at 2 ohms but your running at 4ohm for a total of 300w, does it still counts as 600w? 300

How do the judges confirm all of this


Are there woofer number limits in Street stock B , I didnt see any.
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Old 05-01-2010, 06:30 AM
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its rated rms power at lowest rated impedance of your subwoofer amplifier(s). power is verified by measuring actual power output of the amps during the run.

•Street B – 1-15 or 2-12’s or 3-10’s or 4-8’s
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Old 05-01-2010, 07:01 AM
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So essentially you want 2000 rated rms watts at your sub amps lowest impedance
Then they test during the run and you hope your at 2000 or just a little lower (2000 to be perfect )

One more quick Q

Our high/mid amp has a sub channel (5 channel) and on the street I plan to use it to power a third sub (others are 2 12s) that will fit between the rear captain seats in the van( a downfire console, extra cupholders..lol)

Counting the sub channel on the 5 channel I would be over the max rated wattage

If I just disconnect the 3rd sub from the high/mid amp but leave the box in the van because its somehwhat integrated, am I still legal

Thanks for your knowledge bro
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Old 05-01-2010, 07:03 AM
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Originally Posted by PsychoAcoustics Canada View Post
its rated rms power at lowest rated impedance of your subwoofer amplifier(s). power is verified by measuring actual power output of the amps during the run.
I think he's talking about Street Stock B. My understanding is, as long as your subs aren't "competition grade" and are bought at retail locations, they qualify for street stock.

So does this mean my Crown BPx2200 would qualify because it's rated for 1800rms @ 1ohm. Even though it says 2400 @ 4 ohms and we all know it would test as under 2K.

Last edited by DeadlySones; 05-01-2010 at 07:05 AM.
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Old 05-01-2010, 01:07 PM
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you can have a 10,000 watt amp running in street stock and it wouldn't matter. The judges will clamp your amp just to make sure that you don't go over the 1000 limit in street stock a for the 2000 limit in street stock b. Thus, this is where an amp clamp comes into play. With the amp clamp with peak hold and a multimeter with peak hold comes into play. You can adjust your volume to know how much watts your amp is putting out at each volume. I don't think that there is a limit on subs in street stock but Deezy can confirm this for you.

Last edited by jonesbrooklyn; 05-01-2010 at 01:09 PM.
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Old 05-01-2010, 01:30 PM
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Originally Posted by SOULMUSIC View Post
So essentially you want 2000 rated rms watts at your sub amps lowest impedance
Then they test during the run and you hope your at 2000 or just a little lower (2000 to be perfect )

One more quick Q

Our high/mid amp has a sub channel (5 channel) and on the street I plan to use it to power a third sub (others are 2 12s) that will fit between the rear captain seats in the van( a downfire console, extra cupholders..lol)

Counting the sub channel on the 5 channel I would be over the max rated wattage

If I just disconnect the 3rd sub from the high/mid amp but leave the box in the van because its somehwhat integrated, am I still legal

Thanks for your knowledge bro
you do know that an amp can never produce it's rated power at its lowest rated load, right?

like an amp that's rated to do 2000 watts at 1 ohm will actually NEVER produce 2000 watts when wired at 1 ohm.
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Old 05-01-2010, 01:48 PM
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How much bigger of an amp is needed to get 2000w?
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Old 05-01-2010, 02:39 PM
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I kinda understand Yuli, well maybe.
Class D's give about 80% efficiency at 4 ohms and goes down in efficiency from there, or something similar, I guess depending on the maker etc.
Class A/B maybe 50% and going down with the impedance.

So my 1000 watt class D's give me 800 or less each and my 270w sub channel on the A/B five channel would be would only like 135w.

So if I add it up, I should be well under 2000rms even with the high amp and everything cranked.. I need more huh..

Close?

Jones- I've never heard of a clamp before and I'm not good with a multimeter.
But now that I know I'll be looking that up and learning. Thanks a bunch bro.
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Old 05-01-2010, 08:04 PM
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Yuli is talking about the impedance of the sub-woofer when playing tones, dependent on the frequency it can be several times higher than the Re.

I would say that with a 3000W amplifier you will have the 2000W out of that 800ci battery depending on your equipment and box.
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Old 05-02-2010, 12:28 AM
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Originally Posted by muriloalvares View Post
Yuli is talking about the impedance of the sub-woofer when playing tones, dependent on the frequency it can be several times higher than the Re.

I would say that with a 3000W amplifier you will have the 2000W out of that 800ci battery depending on your equipment and box.
Murilo, luv the signature.lmao.
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