Woofer calculations Frequency X-max and Voltage

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Rob Dingen

Member
Joined 2003
#1
Hi,

I'm building an impuls compensated MFB system with 2 Dayton RSS210HO-8 units.
Put the -3dB point at 30Hz.
I know how to calculate X-max and SPL at a fixed frequency.
VD = 256,6 cm³ X-max 12mm SPL 83,5dB @ 2,83V/1M
Calculation give for a X-max 12mm 30Hz 95,89dB and 100Hz 116,80dB (I know that it cannot reach 116,80dB)
What I like to know which voltage you need to get X-max at a given frequency and how to calculate?
I think it's not as simple as 30Hz 95,89-83,5=12,39dB so it's 11,77V

Rob
 
Last edited:
#2
Rob Dingen said:
Hi,

I'm building an impuls compensated MFB system with 2 Dayton RSS210HO-8 units.
Put the -3dB point at 30Hz.
I know how to calculate X-max and SPL at a fixed frequency.
VD = 256,6 cm³ X-max 12mm SPL 83,5dB @ 2,83V/1M
Calculation give for a X-max 12mm 30Hz 89,75dB and 100Hz 110,67dB (I know that it cannot reach 110dB)
What I like to know which voltage you need to get X-max at a given frequency and how to calculate?
I think it's not as simple as 30Hz 89,75-83,5=6,25dB so it's 5,1V

Rob
Click to expand...
Maybe this will help.
http://www.baudline.com/erik/bass/xmaxer.html
 
#4
I would personally simulate the speaker using Hornresp.
Estimating the power needed for X-max has the added complication of the amount of thermal compression, which could make a conciderable difference to the actual power needed.
 
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