real RMS power - diyAudio
Go Back   Home > Forums > Loudspeakers > Multi-Way

Multi-Way Conventional loudspeakers with crossovers

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 15th April 2003, 11:47 AM   #1
Account Disabled
 
Join Date: Jul 2002
Question real RMS power

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

LINK

Click the image to open in full size.
  Reply With Quote
Old 15th April 2003, 04:59 PM   #2
OMNIFEX is offline OMNIFEX  Jamaica
diyAudio Member
 
OMNIFEX's Avatar
 
Join Date: Mar 2003
Location: Locked Up In The Amp Rack
I would say half of the maximum power. But, not sure
do to the limited information on the site.
__________________
OMNIFEX
  Reply With Quote
Old 15th April 2003, 08:24 PM   #3
diyAudio Member
 
Join Date: May 2002
Location: London, Ontario
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...
  Reply With Quote
Old 15th April 2003, 09:18 PM   #4
diyAudio Member
 
Sch3mat1c's Avatar
 
Join Date: Jan 2003
Location: Milwaukee, WI
Send a message via ICQ to Sch3mat1c Send a message via AIM to Sch3mat1c
Now now now people, you're all forgetting.
The "RMS" cancels in the equations when you go to power. Power is inherently RMS.



Tim
__________________
Seven Transistor Labs
Projects and Resources
  Reply With Quote
Old 15th April 2003, 09:22 PM   #5
Account Disabled
 
Join Date: Jul 2002
in all the type os spek' i divide by 4 ?? to get true RMS ...
  Reply With Quote
Old 15th April 2003, 09:47 PM   #6
OMNIFEX is offline OMNIFEX  Jamaica
diyAudio Member
 
OMNIFEX's Avatar
 
Join Date: Mar 2003
Location: Locked Up In The Amp Rack
You can't divide the maximum by four, until you know
how the maximum was measured.

Maximum doesn't necessarily mean peak.


Dj BASS AMP,

your best bet is to contact the manufacter.


Best Regards,
__________________
OMNIFEX
  Reply With Quote
Old 16th April 2003, 12:20 AM   #7
Banned
 
Join Date: Nov 2002
Location: Adelaide, Australia
Send a message via MSN to SkinnyBoy
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
  Reply With Quote
Old 16th April 2003, 10:31 PM   #8
haldor is offline haldor  United States
diyAudio Member
 
Join Date: Aug 2001
Location: Columbus, Ohio
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.

Phil
  Reply With Quote
Old 17th April 2003, 12:35 AM   #9
diyAudio Member
 
Join Date: Dec 2001
Location: SIUE, Illinois, USA
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...
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Real music power Conta Tubes / Valves 16 14th February 2008 04:19 PM
Real power of zapco z600c2 Clipped Car Audio 5 13th September 2007 05:40 AM
About the real power of an amplifier. dex13 Car Audio 4 17th August 2007 12:23 PM
Real brute power amplifier ostie01 Solid State 9 1st August 2006 08:53 AM


New To Site? Need Help?

All times are GMT. The time now is 05:58 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2