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How do you calculate (or estimate) SPL for a system?

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  • How do you calculate (or estimate) SPL for a system?

    I was telling a buddy I was looking at getting a pair of EV ZXA1s over a pair of ZXA1-Subs. He said he was considering a Peavey Triflex system for the same reasons (size, weight).



    http://www.zzounds.com/item--PEVTRIFLEXII



    The ZZounds description specs the tops at 101db and the sub at 102db. It then specs the "Complete System" at 129db. Questions:



    #1 - Are the compnent and 'Complete System' numbers believable? Believable as any?



    #2 - Can 'System' SPL be calculated simply based on the known SPLs of the three components (and some assumptions)?



    The EV four-bin set would reportedly have two 123dB tops over two 126dB subs. Can a similar "Complete System" number be generated for comparison? Is there a published 'System' SPL number out there for the EV set of four? I couldn't find one. Can they be believed?



    I think I remember seeing the Bose L1 specs at around 115dB (120dB peak). Is that about right?



    Thanks, all!



    -Matt


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