getting to grips with designing my own speakers I want to use a sealed box and have been inputting lots of different drivers into a website calculator however I've noticed a few different results than the manufacturer recommends. having tried a different websites calculator I'm getting wildly different results for the same drivers . is there a reliable app that anyone recommends for android or a particularly good calculator I could use through Google please .the two I've tried so far are the hifi audio design sealed box calculator and the aj design calculator
thanks in advance
thanks in advance
Choose your preferred box Q (Qtc) and divide by the speaker Q (Qts). Multiply this by the speaker resonance frequency (Fs) and you get the closed box resonance frequency (Fc)
Now take Qtc, divide by Qts and square the result. Subtract 1. Divide the speaker compliance (Vas) by your result to get the box volume.
Now take Qtc, divide by Qts and square the result. Subtract 1. Divide the speaker compliance (Vas) by your result to get the box volume.
ah that's interesting so the first part of the equation tells you if the speaker will be suitable for a sealed box in the first place by telling you what resonat frequency you will be able to achieve with the driver your interested in then the second part tells you the size the box would need to be
In a way yes.
There is a test people often do. Take Fs and divide by Qes. If the result is around or below 50, you might find a sealed box is the intended use of the woofer. 100 or more might suggest a vented box or other types.
There is a test people often do. Take Fs and divide by Qes. If the result is around or below 50, you might find a sealed box is the intended use of the woofer. 100 or more might suggest a vented box or other types.
thanks thats the ebp then isn't it ? the first equation you mentioned Is really useful because you can quickly find out if the fc is going to be low enough to make using that driver worthwhile
To answer the initial question of the thread opener:
Speaker Box Lite (https://play.google.com/store/apps/details?id=com.speakerbox.app&hl=gsw&gl=US) for Android does the trick for me. It lets you change all relevant parameters and you can play around with vb (and for reflex designs also fb) while giving an instant display of the simulated reponse.
The free "Lite" version now comes with lots of ads, though.
Speaker Box Lite (https://play.google.com/store/apps/details?id=com.speakerbox.app&hl=gsw&gl=US) for Android does the trick for me. It lets you change all relevant parameters and you can play around with vb (and for reflex designs also fb) while giving an instant display of the simulated reponse.
The free "Lite" version now comes with lots of ads, though.
It's not an app but a homepage that can be okayish used by phone https://www.micka.de/ The simulation is based on a spice model and gives you the best sealed and BR box and in addition you can put in your box parameters and compare your idea Vs the simulated "best fit".
thankyou both ill look Into these options however its quite satisfying having more of ab understanding of the equations to work out the boxes myself if a little time consuming
OK, this implies
(1) volume=infinite to achieve Fc=Fs
(2) volume=Vas to achieve Fc=Fs*sqrt2 i.e. half-octave higher than Fs
(in general) volume=Vas/N to achieve Fc=Fs*sqrt(N+1)
e.g. 1/3 volume for one octave higher; 1/7 volume for 1.5 octaves higher; 1/15 volume for two octaves higher.
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