Members DJ GUY Posted August 9, 2008 Members Share Posted August 9, 2008 This title isn't exact, but... Looking at Yamaha S115V, 500W program and max spl 129db.Looking at JBL MRX515, 800W program and max spl 130db.I know there's 1db difference, but with a 300w difference, should JBL's db be higher or is Yamaha cheating on their numbers or is JBL selling us on wattage, or is there more to this than I realize. Please help me understand. Thanks Link to comment Share on other sites More sharing options...
Members Scodiddly Posted August 9, 2008 Members Share Posted August 9, 2008 "There are lies, damn lies, and specifications". What you need is the set of conditions under which the dB SPL number was derived. What's the frequency range, in particular how low a frequency does the speaker still produce that SPL at? How about distortion? Unfortunately, there's no easy way to boil all this down. Ideally you could rent the two different systems for gigs at the same venue, to decide for yourself it if the system in question meets your needs. Link to comment Share on other sites More sharing options...
Members soul-x Posted August 9, 2008 Members Share Posted August 9, 2008 First off, both of those are calculated values obtained by adding the theoretical gain at the rated peak wattage capability -- 1600W for the JBL and 1000w for the Yamaha -- to the 1w@1m sensitivity ratings. So accounting for real-world factors, neither of these speakers are capable of those numbers. And, even if they were, it would be for a tiny fraction of a second. Secondly, the difference between 500w and 800w for a given device only calculates to a maximum of 2 db. So you really need to understand what exactly the numbers are intending to portray. In these cases, I'd say mostly a bit of marketing fancy. Link to comment Share on other sites More sharing options...
Members mtmra70 Posted August 9, 2008 Members Share Posted August 9, 2008 Isnt SPL the loudness where as watts are the amount of energy needed to achieve that SPL? Therefore, they are "the same loudness" based on the specs (ignoring the 1db difference). Link to comment Share on other sites More sharing options...
Members dboomer Posted August 9, 2008 Members Share Posted August 9, 2008 You are confusing two unrelated things. Even when the test conditions are the same the speaker with the higher SPL level may not be louder (and the wattage has nothing to do with loudness). That's because every single frequency is not this SPL level. It's an average and it is up to the person reading the number to "average" it. It is not an exact measurement. Now if you said SPL at one single frequency then the winner would be the one with the higher SPL ... at least SPL wise. Loudness and SPL are not the same thing. SPL is a measurable pressure level. Loudness is a subjective quantity usually factoring in some distortion. So that a speaker with SPL 120 may not be as loud as one with SPL 117 but that has higher distortion. Link to comment Share on other sites More sharing options...
Members DJ GUY Posted August 9, 2008 Author Members Share Posted August 9, 2008 So, Yamaha might be measuring 129DB at a higher frequency than JBL, which I understand is easier to achive? Link to comment Share on other sites More sharing options...
Members dboomer Posted August 9, 2008 Members Share Posted August 9, 2008 You're not getting it yet read this ... http://www.peavey.com/support/technotes/concepts/THE_LOUDSPEAKER_SPEC_SHEET_GAME_2005.pdf Link to comment Share on other sites More sharing options...
Members tlbonehead Posted August 9, 2008 Members Share Posted August 9, 2008 This title isn't exact, but...Looking at Yamaha S115V, 500W program and max spl 129db.Looking at JBL MRX515, 800W program and max spl 130db.I know there's 1db difference, but with a 300w difference, should JBL's db be higher or is Yamaha cheating on their numbers or is JBL selling us on wattage, or is there more to this than I realize.Please help me understand.Thanks Its pretty simple, if you just blindly go by specs. According to them, the Yams are just a hair more efficient. If you go purely by specs, and if they used the exact same rating, it looks like the JBLs would put out about 128db @500 watts. Link to comment Share on other sites More sharing options...
Members walkerci Posted August 9, 2008 Members Share Posted August 9, 2008 You're not getting it yetread this ...http://www.peavey.com/support/technotes/concepts/THE_LOUDSPEAKER_SPEC_SHEET_GAME_2005.pdf Excellent paper! Link to comment Share on other sites More sharing options...
Members walkerci Posted August 9, 2008 Members Share Posted August 9, 2008 This title isn't exact, but...Looking at Yamaha S115V, 500W program and max spl 129db.Looking at JBL MRX515, 800W program and max spl 130db.I know there's 1db difference, but with a 300w difference, should JBL's db be higher or is Yamaha cheating on their numbers or is JBL selling us on wattage, or is there more to this than I realize.Please help me understand.Thanks A/B the S115V vs MRX515 with 500 Watts of power using the same amp and music. I have the MRX515s. I'm pretty sure your ears will like them better. Link to comment Share on other sites More sharing options...
Members DJ GUY Posted August 9, 2008 Author Members Share Posted August 9, 2008 I have heard both at different music stores and I will agree the JBL's did sound better, not that the Yami's sounded bad at all though, BUT, I can't really open them up at these places due to restricted space (I swear the live sound rooms in these places is deliberately small so things sound louder).I just want to know if these speakers can put out relatively the same volume. Link to comment Share on other sites More sharing options...
Members Gary in NJ Posted August 9, 2008 Members Share Posted August 9, 2008 Personally, I'd choose the speaker that sounds best. Link to comment Share on other sites More sharing options...
Members flanc Posted August 10, 2008 Members Share Posted August 10, 2008 Sounds like the age old question "what's heavier, A pound of chicken feathers or a pound of lead?". I used to think I knew the answer.... Link to comment Share on other sites More sharing options...
Members karlw Posted August 11, 2008 Members Share Posted August 11, 2008 I wrote a couple of articles covering that question: http://www.churchproduction.com/go.php/article/4107 http://www.churchproduction.com/go.php/article/4287 -Karl Link to comment Share on other sites More sharing options...
Members lifeloverwg Posted August 12, 2008 Members Share Posted August 12, 2008 I have heard both at different music stores and I will agree the JBL's did sound better, not that the Yami's sounded bad at all though, BUT, I can't really open them up at these places due to restricted space (I swear the live sound rooms in these places is deliberately small so things sound louder).I just want to know if these speakers can put out relatively the same volume. The JBL should sound better, it costs darn near double the price....... We all agree that the Yamaha's sound very good for the money.Yes, they will produce "relatively" the same volume. However, in my opinion the JBL's sound better while doing it. They are both good value speakers for their price points, you will have to decide if the difference is worth the cost. Winston Link to comment Share on other sites More sharing options...
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