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Hi!
I have tried to design filters in Xsim. One thing that I think is stange is that we get 5db higher sound level at the crossover frequency. When two drivers helping each other we should get the double sound level. Which means 3db. Can someone explain that for me.Example. 16:12 minutes in this video:
(19) Design Crossovers for HiFi speakers using Xsim – Tips and Tricks – YouTube
Regards Robert
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A 3db increase is only double the power. The doubling of SPL is actually a 6db increase with 10db being generally perceived as double to loudness to the average human ear.
In the context of speaker crossover summation you want to be targeting 6db for double SPL
Josh Evans, Professional Live Sound Engineer, High End Commercial AV Install Technician -
Thank you for your answer. But I still dont understand how two spreakers can create 4 times higher sound power. Does it depend on lower impedance att the crossover point so that the amplifier leaves the double power.
If we look at the graph of each drivers output. They show the SPL. If we have two drivers we should get the double of the sound power. Which is 3 db. How could it be 6 db? Maybe you can show me the math?
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In this instance power refers to electrical power measured in watts and spl and loudness are acoustic power measured in decibels. Watts and decibels are not comparable scales of measurement and do not scale up linearly to each other
Try this article, give it a read and let me know if you have further questions
https://jlaudio.zendesk.com/hc/en-us/articles/217201737-Doubling-Power-vs-Doubling-Output
Josh Evans, Professional Live Sound Engineer, High End Commercial AV Install Technician -
Interesting article, but it confirms that ““4 times the power = +6dB…”. But that doesn’t explain how 2 speakers that are muted 6db together play 6db louder.
While reading the article you referred to, I found this video about the Tun audio computer program.
It shows that to get a summed straight curve we must have an attenuation of 6 db at the crossoverpoint when we use Linkwitz Riely and 3 db when we use Butterworth. This leads me to believe that the curve shown for each element doesnt show the sound pressure level (SPL). Because then the math doesn’t add up.
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