Dragster Subs

[Dave McMahon]

Does anyone know what wattage a Dragster DW 124 sub is?

Thanks Dave

 

[Anthony Fremont]

Don't be so sarcastic. that was all i could see for wattage specs
from the website. if you are gonna be rude, use google and go find
the info yourself!

Aw, don't mind him he's just fishing for a fight. He's all in a huff
because there is no such thing as Watts RMS, even though it's (mis)used
all over the place. Whenever you think to write Watts RMS, just replace
the "RMS" with "average sine-wave power" and you'll probably not set off
the local land-mines. ;-)

 

[daestrom]

That's also uncalled for.

Could we please discuss engineering without the personal attacks?

He's been hanging around too much with that *other* poster that is quick to
jump and begin attacking people for any misstep.

daestrom

 

[Larry Durst]

You guys are whack.
If watts RMS is not used correctly then why do companies use the term around
the world?
On websites, product box'z and such.


--
You make fun of what you are really afraid of... and thats us......

2002 Dodge Viper Venom 1000 Twin Turbo by Hennessey Performance Engineering
( www.HennesseyPerformance.com )

Power Output: 900 - 1300 hp

Tested Acceleration: 0-60 in 1.85 sec., 1/4 mile in 8.93 sec. @ 150+ mph
(AND that's only with the optional auto transmission and drag tires).

 

[Louis Bybee]

It's from being driven to out hyperbole the competition, and marketing types
writing the ad copy without consulting, or taking the advice of their
engineering resources (but wait there's more! :-] ).

Visit one of the Home Improvement Box Stores, and check out the size of the
electric motor on a home use Air Compressor rated 5 hp, and greater. The
motor physical size being about that an honest 1 hp motor should be an
indicator for the knowledgeable buyer. The drive to sell doesn't get in the
way of honest, and meaningful, specifications. The drive to sell left a week
earlier, and is already four time zones away! :-]

Louis--
*********************************************
Remove the two fish in address to respond

 

[Anthony Fremont]

This group (alt.engineering.electrical) does have *engineering*
in it's title. And by the way Tony, "average sine-wave power" is
also meaningless. It's *average power*, depending on the failure
mechanism "average" may be over a wildly different time scale. Of
course there are other failure mechanisms than power.

I don't think "average sine-wave power" is meaningless, especially if it
was qualified with some specific frequency, say 400Hz or 1kHz. Since
we're splitting hairs and all, I think it's more meaningful than just
saying 200W by itself. I mean if it's a 200W speaker, can I put 50V DC
at 4A into it safely? How about 1kV at 200mA? ;-) Why specifically
wouldn't it be correct to say "Watts RMS" if that's the type of V they
multiplied by A to come up with W? Should it be assumed that Vrms is
always used when calculating AC power and Watts RMS is redundant? It
just seems to me that Watts RMS actually could stand for something
specific. Should the audio world just measure it as PEP? ;-)

 

[daestrom]

It's from being driven to out hyperbole the competition, and marketing types
writing the ad copy without consulting, or taking the advice of their
engineering resources (but wait there's more! :-] ).

Visit one of the Home Improvement Box Stores, and check out the size of the
electric motor on a home use Air Compressor rated 5 hp, and greater. The
motor physical size being about that an honest 1 hp motor should be an
indicator for the knowledgeable buyer.

Yes, this is one of my pet peeves too. They come up with 'max developed hp'
so they could claim a larger number. But 'max developed' isn't the hp it
can run sustained/continous (which is how one might expect the ratings to be
based). It's something like the hp just as the thing reaches pull-out
torque and stalls. Try running the motor under those conditions and it
burns out.

But does the average consumer know the difference? nope. Does Sears or any
other retailer take the time to explain it? nope. Are they all rated the
same (at least you could 'comparison shop' then)? nope. You have to spend
15 minutes reading through the fine print for such 'tricky phrases'.

daestrom

 

[[email protected]]

You guys are whack.
If watts RMS is not used correctly then why do companies use the term around
the world?
On websites, product box'z and such.

You can buy detergent in the "Giant Economy Size",
the "Family Size", or whatever else the manufacturer
decides to print on the box. But what the heck do those
terms mean? "Watts RMS" is like that - a fancy sounding
term, but what the heck does it mean? To make the
question plainer:

Amplifier A is rated "100 Watts RMS"
Amplifier B is rated 100 Watts"
All other specs are equal.
What does amplifier A have that amplifier B does not?

 

[daestrom]

Nope. This is an *engineering* group. no? As such people should
be using engineering terminology correctly. Sorry if you think
otherwise, dae!

No complaint about correcting the use of engineering terminology per se.
Just the rude flaming that seems to come with it.

daestrom

 

[Edward Steele]

RMS or Root Mean Square, as for putting dc through a speaker it WILL fry the
coil as a speaker is only designed to take AC, to find the peak wattage of
the speaker divide the RMS by 0.707

 

[Avanti]

RMS or Root Mean Square, as for putting dc through a speaker it WILL fry the
coil as a speaker is only designed to take AC, to find the peak wattage of
the speaker divide the RMS by 0.707

Well that has got to be the funniest I have seen for the month.

You can be sure of one thing on this NG....... BAD AND RUBBISH ADVICE!!!!

Note: you can apply DC to a voicecoil.

IIRC RMS is not simply Peak power *0.707

 

[daestrom]

...and may your speakers sound "liquid" with your silver lutz
wire. ;-)

or is it 'litz' wire???

;-)

daestrom

 

[Aaron]

coil as a speaker is only designed to take AC, to find the peak wattage of

Well that has got to be the funniest I have seen for the month.
You can be sure of one thing on this NG....... BAD AND RUBBISH ADVICE!!!!
Note: you can apply DC to a voicecoil.

Yup, this is how one of the theil small parameters is measured. They
apply DC to the coil and measure the actual mechanical force the coil
can apply.

IIRC RMS is not simply Peak power *0.707

RMS is exactly .707 * the peak voltage of a wave. Note that some
companies advertise peak power as both sides of a sine wave added together.

eg. A sub running at 800 watts peak would have 400 watts on one side of
the wave and 283 watts RMS. If a sub can take an advertised 400 watts
RMS, then technically it can take a peak to peak wattage of 1131.5 watts.

Just my $,02 of course

Aaron

 

[Tzortzakakis Dimitrios]

What??You pay two fucking cents for a message??

 

[daestrom]

What??You pay two fucking cents for a message??

Since you're from Greece, I don't know if you're trying to make a joke or
not.

The phrase, 'my two cents worth' (also written several other ways), is just
an expression. Much like the phrase, 'in my humble opinion', the author is
just offering his opinion. Comes from the idea that everyone has opinions,
and they usually aren't worth much (say, around two cents ;-)

daestrom
P.S. Not trying to say that Keith's opinion is worthless, just explaining
the phrase ;-)