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Old 01-10-2013, 12:44 PM
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Default anyone know the BL of atomic apx818?

I'm working on another build and i would really appreciate a little help with a few questions..here goes..

I need a motor comparison..first motor is the RF T2
BL is 21, uses a 4" coil, has triple 1" ferrite slugs at 8.25" OD, 1/2" top plate and bottom plate..and the motor is noticably heavier than the atomic

2nd motor is Atomic APX818, not sure what the BL is..does anyone know??
the motor uses a 4 layer 3" coil, has dual 1" ferrite slugs with close to if not the same OD, 1" top plate and 1/2" bottom plate

questions are:
does anyone know the BL of the atomic?
which motor is stronger?
are higher BL's stronger?
if i was to build 2 subs, 1 with a motor with a BL of 21 and the other sub with a motor with a BL of 29, would the rms/max be different? what affects does the BL of a motor have on the performance of a sub?

thanks for any help provided, i hope to get these questions solved before saturday morning cuz that's when motors ship to me...let er rip!!
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Old 01-10-2013, 05:44 PM
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can anyone help?
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Old 01-10-2013, 05:56 PM
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BL is dependent on re.

a sub wire to 1 ohm and ts pulled has bl of 9
same sub wired to 4ohm and ts pulled has bl of 18

some good info in this thread that should answer most of your questions.
Scientifically what are the Top 5 strongest motors out?
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Old 01-10-2013, 06:04 PM
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Strong BL is great for a spl woofer.

Too strong of a BL will affect the frequency response curve making a certain bandwidth louder then the rest. You dont want +2db a 50hz and the rest of frequencies lacking.
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Old 01-10-2013, 06:09 PM
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more info in this thread as well

Motor force fi sp4
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Old 01-10-2013, 06:11 PM
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The APX 818 is alot stronger! The T2 motor is actually kinda weak, atleast in comparison. Also, Idk if you have a true apx motor since my 818 is 40lbs or more and 9" in diamater.

Bl dosn't indicate motor strength in comparison...Some beefy subs don't have a such a high bl. Go by bl^2 / RE

Last edited by Novicaine; 01-10-2013 at 06:17 PM.
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Old 01-10-2013, 06:17 PM
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Quote:
Originally Posted by Novicaine View Post
The APX 818 is alot stronger! The T2 motor is actually kinda weak, atleast in comparison. Also, Idk if you have a true apx motor since my 818 is 40lbs or more and 9" in diamater.

Bl dosn't indicate motor strength in comparison...Some beefy subs don't have a such a high bl.
i had to guess at the diameter of my motor beings they're mounted in a box right now..i was having so much trouble finding 2 more 818's to make the jump to 4-18's so i thought of switching motors..guess i'll be sticking with the atomics then....problem solved
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Old 01-10-2013, 06:20 PM
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bl will change with how full the gap is of coil also

its not a parameter you can guess only measure it
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Old 01-10-2013, 07:37 PM
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didn't guess at anything but the motor diameter of my 818's..i'm sticking with the atomics till i can find 4 of the same motors..i'll just use the T2's to build my brother a pair of subs
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Last edited by beatnbronco; 01-10-2013 at 07:40 PM.
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