IEC Loudspeaker Rating
Printed From: Speakerplans.com
Category: General
Forum Name: Newbie Discussion
Forum Description: Newbie Discussion/Questions. Look less stupid here...
URL: https://forum.speakerplans.com/forum_posts.asp?TID=100663
Printed Date: 19 April 2024 at 3:17pm
Software Version: Web Wiz Forums 12.06 - https://www.webwizforums.com
Topic: IEC Loudspeaker Rating
Posted By: AJ113
Subject: IEC Loudspeaker Rating
Date Posted: 14 November 2017 at 7:46am
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I have a pair of JBL M350s which are in good working order. They are rated at 350 watts IEC. Bearing in mind the rigorous standards of IEC testing I assume the IEC rating is equivalent to a higher AES rating. I'm just wondering how much power to deliver, I don't want to wreck them. Is there an accepted rule of thumb for comparing IEC to AES/RMS? |
Replies:
Posted By: DMorison
Date Posted: 14 November 2017 at 1:47pm
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JBL's own guide to what their power specs mean is practically the first google result if you search for "IEC Loudspeaker Rating": https://www.jblpro.com/pub/technote/spkpwfaq.pdf" rel="nofollow - - HTH, David.
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Posted By: AJ113
Date Posted: 14 November 2017 at 2:51pm
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Yes I've read that already thank you. On that basis do you think that 350 watts AES is equivalent to 350 watts IEC? |
Posted By: DMorison
Date Posted: 14 November 2017 at 3:15pm
Depends which version of AES you're referring to? The original 1984 version used the same crest factor and HPF/LPF slopes as IEC, but only one decade rather than the "decade and a little bit" of the IEC. It's also only run for 2 hrs rather than the 8hrs JBL talk about. It also starts at the LF limit of the box, rather than at a standardised 40Hz, so the IEC may apply much more stress to drivers that are in boxes tuned higher than this. The 2012 update of AES increases the crest factor, and also uses steeper slopes. That means a driver rated with this procedure can withstand higher peaks (along with the stated average), but has had more protection from overexcursion during the test. Therefore, it doesn't necessarily tell you how well the box will handle mis-use eg if you were to hook it up to an amp without an HPF etc. The nice thing about standards is there are just soo many to choose from  (© Ivan Beaver, 1903) |
AJ113 wrote:Posted By: Conanski
Date Posted: 15 November 2017 at 11:48pm
All you have to do is look at the drivers in this box, they aren't highend so this box won't tolerate a lot of power or abuse. I suggest treating they have a 350w program rating where one could use a 500w amp but only with dynamic program material. |