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Author Topic: Finished Labs and already used ata the gig  (Read 6542 times)

Too Tall (Curtis H. List)

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Re: Finished Labs and already used ata the gig
« Reply #10 on: May 10, 2004, 10:55:44 AM »

MarjanM wrote on Sun, 09 May 2004 15:08

Hi All,

Finally  i have finished my first two Labs.
Yesterday they were playng on a Psychedelic Trance party with some DJ from France and for around 400 - 450 audience.
They were driven with one Crest C12 - one lab per channel and amps were just tickling the clip lights from time to time.

Two weeks ago I was doing the same place, same audience, same music with 4 RCF Vision 18" and same amp.

The difference was really noticeable. Not that much in power but in the clarity of sound and the octave plus below the RCFs.

Labs was placed approximately 10m(30ft) wide form each other and on their side layed on the floor with bottoms faced toward each other.

Considering that they were fed with badly processed signal (some fool locked the DSP unit and we were not able to properly set the low and high pass filters for the subs) and also no delay to the tops so i had to place them little further back and aside to compensate a little.

After the successful event I have noticed that the aluminum plates were worm, not hot but worm, is this normal?

Hi Marjan,
   Just shooting from the hip I would first note any differences from typical use.
   You mention that the xover might not have been set properly, but you don't say exactly how it was set.
   Was the xover set higher then normal? More bandwidth will show up as more heat. Perhaps not enough to be obvious, but it would be something to look at.

   Any kind of compression.
Rave music in general is highly compressed material to start with compared to pop music in general.
   Lastly running anywhere near clip (i.e. near or above what the amplifier power supply is capable of) is another form of compression. BTW, does the C12 have on board limiting? If that is engaging we have an even higher average power level.

   I'm not saying you are doing anything wrong here, just looking for likely causes for a little extra heat.
Too Tall

I guess it is, concerning that driver went is shooting directly to the ALU plate.

So if the cash allow, I will soon build another pair.

At the and thank you all for making this forum as it is an to Mr. Danley for sharing the plans with us.


Too Tall
        Curtis H. List    
             Bridgeport, Mich.   
        I.A.T.S.E. Local # 274 (Gold Card)
        Lansing, Mich
Independent Live Sound Engineer (and I'm Tall Too!)

Marjan Milosevic

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Re: Finished Labs and already used ata the gig
« Reply #11 on: May 10, 2004, 12:31:45 PM »

How bad DSP was set?

That is the question that I am asking my self from the event till now.

The DSP was locket with all filters used and i was forcet to use anything already set that is closer to the one required.
It is my free shooting guess that is was set somvere near 300Hz because it was always used for system with front loaded 18s.

If that extra frequency is the reason that labs were worm then i am not in trouble because i will solve that problem until next party.



Michael Prasuhn

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Re: Finished Labs and already used at a gig
« Reply #12 on: May 10, 2004, 07:58:48 PM »

MarjanM wrote on Mon, 10 May 2004 05:25


Those boxes are damn heavy. I didnt have time to put any handels or weels so it was dificult to lift them and carry to the stage.

Lets ask Mr. Danley to invent some antigravity device to carry our equipment. Very Happy


Funny you should say that, I believe if you search the archives long enough you will find that some of Mr Danley's experience includes researching acoustic levitation.

-Mikey P
Michael D. Prasuhn
Freelance audio engineer and technical director/IT

Tamas Tako

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Re: Finished Labs and already used ata the gig
« Reply #13 on: May 11, 2004, 03:04:36 AM »


Sorry, I was wrong. The PL4.0 can deliver ca. 1600W @3Ohms...
So if the -10dB led was lit some times but not all the time then the average power was some 200W... Laughing



Marjan Milosevic

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Re: Finished Labs and already used at a gig
« Reply #14 on: May 11, 2004, 03:12:00 AM »

I know that  Very Happy, and that surely makes him qualified to invent such a thing, is in it?

Clive D Milne

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Re: Finished Labs and already used ata the gig
« Reply #15 on: May 18, 2004, 10:30:13 AM »

   Keep in mind that when labs are used as single units, less of
your amplifier power is being converted into acoustic energy
than when they are properly coupled as a group of 4-6.  
The energy that doesn't come out as sound is released as heat in
the voice coil instead.  Logically, you would expect to see a
single lab run less efficiently and have reduced power handling
as a consequence of the voice coil bottoming out more easily
and running hotter for the same input power.


 The LABs are sinners, they must be punished!
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