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Old 15th April 2003, 11:47 AM   #1
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Question real RMS power

how much real RMS the LANZAR MXW15 - 1200W MAX can work Max ?? (4 ohm)


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Old 15th April 2003, 04:59 PM   #2
OMNIFEX is offline OMNIFEX  Jamaica
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I would say half of the maximum power. But, not sure
do to the limited information on the site.
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Old 15th April 2003, 08:24 PM   #3
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Default here's the REAL rms formula...

for such lame claims..

just take whatever the max they say and divide by 4..

and that's your true RMS..

there's my 2 cents..

so basically..

its a 300 watts rms sub...
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Old 15th April 2003, 09:18 PM   #4
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Now now now people, you're all forgetting.
The "RMS" cancels in the equations when you go to power. Power is inherently RMS.

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Old 15th April 2003, 09:22 PM   #5
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in all the type os spek' i divide by 4 ?? to get true RMS ...
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Old 15th April 2003, 09:47 PM   #6
OMNIFEX is offline OMNIFEX  Jamaica
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You can't divide the maximum by four, until you know
how the maximum was measured.

Maximum doesn't necessarily mean peak.


your best bet is to contact the manufacter.

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Old 16th April 2003, 12:20 AM   #7
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I hate the way they rate speakers... for instance.. Peerless say "Long term Max System Power" is that maximum? or RMS? Its max, lol, but its continuous.. :S AHHH!!!! lol
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Old 16th April 2003, 10:31 PM   #8
haldor is offline haldor  United States
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There is often more than one power rating on a speaker in an attempt to reflect different real world issues that can limit how much power the speaker can handle.

Peak Power. This is typically the physical excursion limits of the suspension and cone. Exceed this and the speaker tears itself apart. Drive with this much power for very long and the voice coil will fry.

Continuous power. This is the amount of power that the voice coil can withstand long term without the voice coil overheating. This rating is often called "RMS" power, which is not really that big a misnomer since the limiting factor is the amount of heat the voice coil can dissapate.

Music Power. This can be a garbage spec, but there is some logic behind it. The idea is that music typically has a low crest factor (the average power level is usually considerably lower than the dynamic peaks). In between peaks the voice coil gets a chance to cool off. The kind of music you are playing determines if this spec means anything. If you listen to heavily compressed music then the average power will much closer to peak power.

Now some companies like to lie with specs. "Peak" power might simply be the peak voltage (VAC RMS * sqrt 2) times peak current (IAC RMS * sqrt 2). This is simply a way to double the power rating and have a tissue of credibility if called on it.

Example of lying Peak Power rating: 100 W into an 8 Ohm load:
VAC = 28.3 RMS. Peak V = 40V
IAC = 3.5A RMS. Peak I = 5 A
40V * 5A = 200 Watts Peak.

This kind of calculation has nothing to do with the peak power rating I described above.

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Old 17th April 2003, 12:35 AM   #9
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BTW, ask lanzar for the specs on that sub... the sent me the specs with Qts and Qes reversed i think (hope). Qts was somehow larger.
if only it could be used for good, not evil...
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