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Setting limiters on Berry LMS

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S DeXter View Drop Down
Young Croc
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Post Options Post Options   Thanks (0) Thanks(0)   Quote S DeXter Quote  Post ReplyReply Direct Link To This Post Posted: 26 August 2011 at 1:11pm
Originally posted by james folkes james folkes wrote:

i live in fear of dcx limiters... the only time i have ever blown speakers in my whole time doing this was when i decided to trust the ultradrive limiters to keep my amps out of clip. never again. norty has had some 18lx60s go pop under similar circumstrances too. i must temper this statement with information received that <20Hz run their hogs with the limititer lighting up all night long and have never had a problem.
 
i don't trust them though...
 
james.


I think they are probably OK if the release time is set quite long. However I too have had similar problems with the DCX limiters :(
Enjoy your self...... It's later than you think.......
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Post Options Post Options   Thanks (0) Thanks(0)   Quote festival people Quote  Post ReplyReply Direct Link To This Post Posted: 02 November 2011 at 3:46pm
Hiya, I gave a good manual method because I too have blown drivers with a "mathamtical" aproach to limiters on the dcx.......I think sometimes the calibration may be a little off......but it is a good start point.......but as I said, I have a link to the dcx from my laptop and monitor the dcx at the sound desk so can adjust on the fly if the roadies indicate redl lights at the stage end.....lol
regards
dave
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SebP Quote  Post ReplyReply Direct Link To This Post Posted: 09 November 2011 at 5:47am
There's a online calc  for DCX2496 here: http://hornplans.free.fr/limiteur_dcx2496.html
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Post Options Post Options   Thanks (0) Thanks(0)   Quote phildat Quote  Post ReplyReply Direct Link To This Post Posted: 09 November 2011 at 9:43am
just tried that above thanks

so let me get this right

using an amp 1900 watts 4 ohms...the limiter needs to be set at 19.2 threshold?

just double checking with others...?
Its just a ride.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote vibez Quote  Post ReplyReply Direct Link To This Post Posted: 09 November 2011 at 5:28pm
My berry limiters were set by Tony Wilkes and they work perfectly, have been set for over 12 months now and my rig has been pushed hard many times without losing any drivers. Thanks again Tony 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Tony Wilkes Quote  Post ReplyReply Direct Link To This Post Posted: 10 November 2011 at 7:38am
It seems to me that pepes expect their limiters to be able to be set to within 0.1db of absolute max. power and still protect the rig.

If they are set-up a little bit conservative and lets be honest if you constantly have to push your gear on or near to 100% all of the time you are doing things totally wrong then you should never blow a driver apart from amp failures or bad design.

Just wind it back 1-1.5db that's all it takes.

Tony
www.forteaudio.eu - BMS - db-Mark Processors - Lexon (SAE)
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Post Options Post Options   Thanks (0) Thanks(0)   Quote toastyghost Quote  Post ReplyReply Direct Link To This Post Posted: 10 November 2011 at 3:24pm
Originally posted by phildat phildat wrote:

just tried that above thanks

so let me get this right

using an amp 1900 watts 4 ohms...the limiter needs to be set at 19.2 threshold?

just double checking with others...?




Depends on the amp input sensitivity.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote space141 Quote  Post ReplyReply Direct Link To This Post Posted: 09 October 2015 at 9:51am
Know this thread has been dormant for a few years but I have found it rather useful as I am just setting up my first soundsystem. I am having difficulty understanding how you calculate the ratio of power so that you are not running your amp at full tilt. The equation below is a little confusing:

Originally posted by AlfieDring AlfieDring wrote:


With the limiter set at -22dB the output from the ultradrive will be constrained to 0.775v and the output from the amp to 900w. To further drop this to 700w we work out the dB power ratio of 900/700 and subtract this from the previous -22dB...

10 Log (900/700) = 1.091dB


What does the 10 Log stand for as 900/700 = 1.29

I understand we're trying to work out a ratio here but need a little assistance getting my head round this one.

My amps are a QSC RMX850 & RMX1450 which both have an input sensitivity of 1.15v (+3.4dBu) which I am running in bridge mono mode into 8ohm speakers with an output power of 530W & 800W respectively.

Cheers.


Edited by space141 - 09 October 2015 at 9:58am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DMorison Quote  Post ReplyReply Direct Link To This Post Posted: 10 October 2015 at 3:03pm
Originally posted by space141 space141 wrote:

Originally posted by AlfieDring AlfieDring wrote:


With the limiter set at -22dB the output from the ultradrive will be constrained to 0.775v and the output from the amp to 900w. To further drop this to 700w we work out the dB power ratio of 900/700 and subtract this from the previous -22dB...

10 Log (900/700) = 1.091dB


What does the 10 Log stand for as 900/700 = 1.29

I understand we're trying to work out a ratio here but need a little assistance getting my head round this one.


Log means you take the base 10 Logarithm of the ratio in the brackets (easily available on any scientific calculator or spreadsheet) and the 10 meas you multiply the result of that by 10.

So, 900/700= 1.29, just as you say;
Log(1.29) = 0.109
10*Log(1.29) = 1.09.

Seemples.

David.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote S360 Quote  Post ReplyReply Direct Link To This Post Posted: 16 September 2018 at 10:04am
Hi Alfie,

I would like to ask you why do you take for granted that the relationship between dBfs and DBu is proportional on the Dcx. Im working with this proccesor and with de Drive Rack Pa2 (dBx) and at least in the dBx they provide you this information:

Imput Leds 

dBFS

(Switcher +4 dBu)

(Switcher in -10 dBV)

0

-0.1

19.9 dBu

7.7 dBV

3

-3

17 dBu

4.8 dBV

10

-10

10 dBu

-2.2 dBV

15

-20

5 dBu

-7.2 dBV

20

-30

0 dBu

-12.2 dBV

SIG

-48

-28 dBu

-40.2 dBV


As you can see the relationship between dBfs and dBu is not proportional, I`ve tried to find this information on the Dcx manual but behringer doesn`t bring it.

Don`t now what to do O.o'

Thanks in advance,

S360
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Post Options Post Options   Thanks (0) Thanks(0)   Quote suparub Quote  Post ReplyReply Direct Link To This Post Posted: 06 August 2019 at 8:40am
up :)
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