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[Bob Faulkner]

You have the RMS limiter set far, far too high.  I'd suggest 1/3 or less.  The attack and release are right.

The Crown documentation states to use the "continuous" rating of the speaker for the RMS setting (which is the 1600); this seems right, but I'm open to learning what it actually should be.

For the peak limit, this is the one that doesn't "add up"!  Any recommendations on this? 

[Lee Buckalew]

The Crown documentation states to use the "continuous" rating of the speaker for the RMS setting (which is the 1600); this seems right, but I'm open to learning what it actually should be.

For the peak limit, this is the one that doesn't "add up"!  Any recommendations on this?

If you go online to Crown to one of the I-Tech HD amplifier pages thee are two downloads under "documentation" on the left hand side.  IT HD Limiter Wizard, which is a spreadsheet and the LevelMax Guide.  These may be helpful tools for you to look at.

Lee

[David Sturzenbecher]

If you go online to Crown to one of the I-Tech HD amplifier pages thee are two downloads under "documentation" on the left hand side.  IT HD Limiter Wizard, which is a spreadsheet and the LevelMax Guide.  These may be helpful tools for you to look at.

Lee

Unfortunately, I don't think this will be of much help to the OP. He is using Macrotech i amplifier, which do not have limiter max.  They use the older original itech limiting.  The limiting that JBL didn't even fully utilize in their Vertec presets (on the itech). 


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[Lee Buckalew]

Unfortunately, I don't think this will be of much help to the OP. He is using Macrotech i amplifier, which do not have limiter max.  They use the older original itech limiting.  The limiting that JBL didn't even fully utilize in their Vertec presets (on the itech). 


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Macro-Tech I is the third tab of the spreadsheet.

Lee

[Bob Faulkner]

Macro-Tech I is the third tab of the spreadsheet.

Lee

Great tool!  Thank you very much.  I'll need to visit JBL's website to figure out the 2 hr and 100 hr wattage limits.  Seems like in the past, the 100 hr rating was the "continuous" figure, but I don't think drivers/cabinets are rated like that (anymore?).

[David Sturzenbecher]

Macro-Tech I is the third tab of the spreadsheet.

Lee

Well shoot, thanks Lee... didn't know that tab existed.


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[Tim McCulloch]

Great tool!  Thank you very much.  I'll need to visit JBL's website to figure out the 2 hr and 100 hr wattage limits.  Seems like in the past, the 100 hr rating was the "continuous" figure, but I don't think drivers/cabinets are rated like that (anymore?).

JBL's testing is in free air so it can't take into account the heat containment of the loudspeaker enclosure.

At 1600W you'll NEVER see your RMS limiter kick in, the speakers will be releasing Majik Smoke before you can sing a verse and chorus of Puff, the Burned out Subwoofer.  Further consider that you're unlikely to be able to power your subs with that much *continuous* power without some old iron amplifier and they'd likely be in constant clip to deliver it.

Do what you want but if you go back and read the discussions between Ivan, me and possibly Art W (can't remember for sure who the 3rd person was) about empirical testing to find power compression, you'll find that for the purposes of protective long-term power limiting, using the RMS rating of the speaker will provide little or no protection.

Take your pick of "Wake up and smell the voice coils" or "I love the smell of voice coils in the morning".  Just sayin'.

[Bob Faulkner]

JBL's testing is in free air so it can't take into account the heat containment of the loudspeaker enclosure.

At 1600W you'll NEVER see your RMS limiter kick in, the speakers will be releasing Majik Smoke before you can sing a verse and chorus of Puff, the Burned out Subwoofer.  Further consider that you're unlikely to be able to power your subs with that much *continuous* power without some old iron amplifier and they'd likely be in constant clip to deliver it.

Do what you want but if you go back and read the discussions between Ivan, me and possibly Art W (can't remember for sure who the 3rd person was) about empirical testing to find power compression, you'll find that for the purposes of protective long-term power limiting, using the RMS rating of the speaker will provide little or no protection.

Take your pick of "Wake up and smell the voice coils" or "I love the smell of voice coils in the morning".  Just sayin'.

This is great Tim!  Thanks!

Yep, I agree 1600 seems a bit high (the Crown manual specifically states to use the "continuous" rating).  I'm open to suggestions for what would be an average level (if there is such a thing) to start with.

And yes, "I love the smell of voice coils in the morning"...

[Bob Faulkner]

...as a follow up to my previous post, I see JBL rated their continuous power using a 6db crest factor.  Doing the math, this should equate to 400 watts... perhaps this should be the RMS setting.

[Tim McCulloch]

...as a follow up to my previous post, I see JBL rated their continuous power using a 6db crest factor.  Doing the math, this should equate to 400 watts... perhaps this should be the RMS setting.

Bob, I think I just saw the light bulb over your head flash!

And this is why the longer attack and release times, you want the peaks to get through but you don't want so much long term power that you have excessive power compression or burn up the VC.

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