Hello,
I am testing the passive radiator slaps-M8 from earthquake. The specification says there is a 160g provided with the P-R and those can be removed (or add more) to tune the P-R.
See picture : https://www.amazon.com/Earthquake-Sound-Slaps-M8-Subwoofer-Enclosures/dp/B079R612VJ?th=1
According to the manual, the box should be tuned to 23Hz, but it is 35hz.
The companion driver is dayton E180-HE-44, and it does not sollicitate a lot of movement from the P-R with my setup (Limited in power).
Is there a break-in period for this P-R and how can i break-in this P-R.
Thanks for your help.
I am testing the passive radiator slaps-M8 from earthquake. The specification says there is a 160g provided with the P-R and those can be removed (or add more) to tune the P-R.
See picture : https://www.amazon.com/Earthquake-Sound-Slaps-M8-Subwoofer-Enclosures/dp/B079R612VJ?th=1
According to the manual, the box should be tuned to 23Hz, but it is 35hz.
The companion driver is dayton E180-HE-44, and it does not sollicitate a lot of movement from the P-R with my setup (Limited in power).
Is there a break-in period for this P-R and how can i break-in this P-R.
Thanks for your help.
Don't expect there would be much break-in required, but pushing the P-R by hand to the extent of it's excursion (~3.5" peak to peak) would be a good start.
To be audible at one meter (~75dB) at 23Hz would require about 4mm peak to peak movement from the P-R.
That said, with limited power, trying to tune so far below the driver's Fs of 35Hz is not going to result in much P-R excursion, or output.
How have you determined your Fb to be 35Hz?
What is the net box volume you are using, and how much added mass was used?
To be audible at one meter (~75dB) at 23Hz would require about 4mm peak to peak movement from the P-R.
That said, with limited power, trying to tune so far below the driver's Fs of 35Hz is not going to result in much P-R excursion, or output.
How have you determined your Fb to be 35Hz?
What is the net box volume you are using, and how much added mass was used?
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Hello, box is 22 liters. D did a an impedance sweep (dats) and mic measurement near the P-R cone. The impedance matches the simulations.
I added 160g and the fb went down to 25hz.
Trying to achieve an ebs alignment and compensate with bass boost.
I am almost convinced that there is not 160g installed on this P-R as received It takes 10mm of 2inch dia metal washer to get 160g.
I'll do a good massage on the cone peak-to-peak. and remeasure.
Regards
I added 160g and the fb went down to 25hz.
Trying to achieve an ebs alignment and compensate with bass boost.
I am almost convinced that there is not 160g installed on this P-R as received It takes 10mm of 2inch dia metal washer to get 160g.
I'll do a good massage on the cone peak-to-peak. and remeasure.
Regards
""ryanmh1" found the SLAPS-M12 calculated Vas to be only about 1.5 cubic foot, while the specs Vas is 4.52 cubic feet.
https://data-bass.ipbhost.com/topic/746-passive-radiator-project-or-captivator-in-a-tiny-box/
The M8 Vas is specified as .66 cubic foot, if it acts like the M12, it's Vas would also be much less (a stiffer spring..), so would require more weight than the tuning chart would indicate.
He also loaded the weight equally on the front and back of the M12, which sounds like a good idea, considering he added over 1000g of mass.
https://data-bass.ipbhost.com/topic/746-passive-radiator-project-or-captivator-in-a-tiny-box/
The M8 Vas is specified as .66 cubic foot, if it acts like the M12, it's Vas would also be much less (a stiffer spring..), so would require more weight than the tuning chart would indicate.
He also loaded the weight equally on the front and back of the M12, which sounds like a good idea, considering he added over 1000g of mass.