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Author Topic: Power  (Read 2379 times)

Rick

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Power
« on: August 23, 2004, 07:34:53 pm »

Well, its been a long time coming, but I finally finished my first LAB sub yesterday.  We then delivered it to our local bar for a trial run! ( it was basically rattling my house to its death, so the bar was my next trial)  What can I say, congratulations to all who have contributed to this project, I was very, very impressed with the sound that we got from the LAB, absolutely awesome.  #2 is on its way !

Also, a quick question that has probably already been discussed, what sort of power can these handle?  I know they are rated 400w RMS per driver.  Last night we were firing 2500+ watts into a single cabinet(without clips or limiting), and they did not seam to mind? Whats the MAX you guys have powered them with?
Any comments would be great.



Thanks

Rick
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Al Limberg

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Re: Power
« Reply #1 on: August 23, 2004, 09:28:13 pm »

Hi Rick,
To make it perfectly simple and concise, the answer is "it depends".  Power handling is dependent on more than just the ratings of the drivers.  First you must consider how many boxes you are running and how they are stacked or placed.  As you add to the number in your system (and the number in each 'stack') the low frequency response extends lower and the power handling goes up a bit.  If you find yourself running them one per side in a typical club set-up, I would suggest using a steep HPF at about 35Hz and the old 'rule of thumb' 2x the speaker's rated continuous power handling - in this cse about 1600w @ 3 ohms.  If you can manage to put the two together in a center cluster, I would leave the power about the same and maybe lower the HPF to about 32Hz.  When you get to 4 or 6 per cluster, the HPF can go down to 28Hz and perhaps you can goose up the power a bit.  My word of warning would be that the LabSub doesn't exhibit the typical distortion and grunge exhibited by front-loaded cabinets - it won't give you nearly the warning that it might be in its death throes (see Jeremy's post below).

As far as maximum I've seen used, back at the first subwoofer shootout we ran 4 Labs off a QSC 9.0 and tickled the compression LEDs on occasion with no apparent problems.

HTH,
Al
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If the automobile had followed the same development cycle as the computer, a Rolls-Royce would today cost $100, get one million miles to the gallon, and explode once a year killing everyone inside - Robert X. Cringely

Josh Billings

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Re: Power
« Reply #2 on: September 08, 2004, 09:52:30 am »

What amp were you using?? Like what configuration

I'm trying to find the BEST 15amp plug amp for my labs.

I have about 1,000 to spend

-Josh
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Alan Searchwell

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Re: Power
« Reply #3 on: September 08, 2004, 10:05:25 pm »

One of the best threads on this topic is this one:

http://srforums.prosoundweb.com/index.php/m/951/0#msg_951

There have been others at the old board at the following URL for those who have not been lurking as long:

http://www.prosoundweb.com/community/forum.php?board=3

One good thread from the archives is:

http://www.prosoundweb.com/community/read.php?board=3&id =153421

A little time taken to do a thorough search of the mountain of information on this board and the archive can unearth a lot. What ever happened to that idea for a FAQ? I vote for this question to be number 1.  
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Searchie in Kingston
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