online limiter calculators & LMS input sensitivit |
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cabguy21
New Member Joined: 16 September 2019 Location: east anglia Status: Offline Points: 5 |
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Posted: 16 September 2019 at 12:20pm |
hi all! this probably sounds like a really dumb question but here goes. im setting limiters for 2 x 1000 watt drivers on my lms at 4 ohm. the calculator equates to 9.4dbu for this the lms has a maximum input level of +20dbu am i right in saying this inverts to -20dbu and so the limiter threshold setting would be -20+9.4 = -10.6dbu? or would i put 9.4dbu into the limiter threshold on the lms? only ask as have heard contrasting things and with levels right up on amp and mixer -10.6dbu threshold limit seems overly quiet when i know the bins can comfortably put out alot more. Edited by cabguy21 - 16 September 2019 at 12:22pm |
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DMorison
Old Croc Joined: 14 March 2007 Location: Aberdeen Status: Offline Points: 1647 |
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Not quite: Your LMS can accept up to +20dBu input (is its max output spec the same? If not, use the output spec rather than input.), but your amp only needs +9.4dBu to reach the level you want, so you'd limit the LMS at -10.6dB relative to it's maximum output (ie +9.4dBu), not -10.6dBu.
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cabguy21
New Member Joined: 16 September 2019 Location: east anglia Status: Offline Points: 5 |
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Yes sorry, the output maximum is the same +20dbu.
Ah okay that makes sense so the limit threshold on the lms would just be the calculated 9.4dbu? Rather then having to subtract or add this to any other numbers to get the threshold number for the lms? |
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DMorison
Old Croc Joined: 14 March 2007 Location: Aberdeen Status: Offline Points: 1647 |
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Yup, assuming the limiter calculator you used hasn't done anything weird, it's just the straight 9.4dBu you use as your limiter threshold.
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cabguy21
New Member Joined: 16 September 2019 Location: east anglia Status: Offline Points: 5 |
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thanks, i was massively over complicating it in my head!
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toastyghost
The 10,000 Points Club Joined: 09 January 2007 Location: Manchester Status: Offline Points: 10920 |
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Bear in mind most limiter calculators are just doing an equation, they are not taking into account the music content or the way you run the rig.
It also depends if your DSP's limiter is peak, RMS, or a combination of both. If you're playing heavy music, not live stuff with dynamics, you may need to reduce that value considerably to avoid overheating your coils. |
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cabguy21
New Member Joined: 16 September 2019 Location: east anglia Status: Offline Points: 5 |
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Thanks Toasty I will keep that in mind. I had and always would set them a good 3 or so dbu lower then the calculated threshold. To be honest when I set the limiter 3dbu higher over what I thought was the limit point so -7.6dbu that was more then enough so it's nice to that figure is well within theoretical limit point of 9.4dbu
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toastyghost
The 10,000 Points Club Joined: 09 January 2007 Location: Manchester Status: Offline Points: 10920 |
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Cool, but also be careful of slamming into limiters all night. That increases the average power and you’ll reach thermal compression more quickly. Set them at say 6dBU and keep an eye on it and you should be good for almost anything. Need more output? Bring more boxes. |
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