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Navanor View Drop Down
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    Posted: 13 June 2023 at 9:38am
Hi Speakerplans, 

I have sourced all drivers for my rig. Mid-top and kick are all very good drivers, however, I have bought cheaper drivers to begin with for the scoop section. These are 4 ohm Lavoce SAF184.3 drivers. The 8ohm drivers look good on paper for their price. but now I asked more info about the 4ohm version and received these parameters:



Does anybody have any experience on using 4ohm drivers in scoops? 
Cheers!
Nathan
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levyte357- View Drop Down
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Points: 8517 		Post Options Post Options   Thanks (0) Thanks(0)   Quote levyte357- Quote  Post ReplyReply Direct Link To This Post Posted: 14 June 2023 at 10:47am
What design are your Scoops ?

Either way, that BL=21.6, tells you, this driver will not last very long, when Driver is pushed, or Sub boost applied.

Dependng on Scoop design, see paramters for Void V18-1000, B&C 18TBX100, B&C 18DS100,  PD 1852, 18sound 18NLW9601, for examples of drivers, very suited to Scoops.


Edited by levyte357- - 14 June 2023 at 11:01am
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smitske96 View Drop Down
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Points: 1217 		Post Options Post Options   Thanks (0) Thanks(0)   Quote smitske96 Quote  Post ReplyReply Direct Link To This Post Posted: 14 June 2023 at 11:42am
@levyte357

Only BL won't tell you the whole story. To get correct motorstrength using something like BL^2/Re will give you a better approximation. 

While the SAF184.03 still is not very high it surpasses the 18TBX100-8 at 145,8 vs 127,5.
So the 184.03 4 Ohm has a stronger motor than the 18TBX100-8.
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levyte357- View Drop Down
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Points: 8517 		Post Options Post Options   Thanks (0) Thanks(0)   Quote levyte357- Quote  Post ReplyReply Direct Link To This Post Posted: 14 June 2023 at 12:05pm
Originally posted by smitske96 smitske96 wrote:

@levyte357

Only BL won't tell you the whole story.


Originally posted by <a href=https://www.speakerplans.com/index.php?id=faq1%5d rel=nofollow>https://www.speakerplans.com/index.php?id=faq1 https://www.speakerplans.com/index.php?id=faq1 wrote:


BL: Driver motor strength.

The higher the value the stronger the motor. Given in tesla meters. Drivers with high BL values of around 30 or more have the ability to control their cones very accurately. These drivers will almost certainly have very large magnets and will weigh a lot. Note also that drivers with high BL values will normally have a low Qts value. Drivers with a low BL value of 20 or less will be less able to control their cones. These drivers will not feel as tight as those with higher BL�s. They will also normally have higher Qts values of over 0.28 and while at home in ported or bandpass cabinets I call these drivers mud motors because of there slow and heavy sound with a less than perfect transient response.



Extract from FAQ,
Created by Rog Mogale,
Creator of Void Acoustics/forums.speakerplans.com


Edited by levyte357- - 14 June 2023 at 12:11pm
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smitske96 View Drop Down
Young Croc
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Points: 1217 		Post Options Post Options   Thanks (0) Thanks(0)   Quote smitske96 Quote  Post ReplyReply Direct Link To This Post Posted: 14 June 2023 at 1:52pm
that statement is overgeneralization. It only takes BL as the sole parameter to determine the strength of a speakers motor. Eventhough, BL is lower due to a shorter voice coil wire (thicker wire gives lower impedance). Because that same impedance is lower, it will result in a higher current for the same amount of power.  As current increases, magnetic forces will increase. In the end both Re and BL are intertwined and both can't describe the motor strength of a speaker alone.

Therefore, you are not gonna tell me that Ipal drivers are weak just because they have a low BL. 
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fat_brstd View Drop Down
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Points: 2184 		Post Options Post Options   Thanks (0) Thanks(0)   Quote fat_brstd Quote  Post ReplyReply Direct Link To This Post Posted: 15 June 2023 at 12:45am
If you look at the specs on 4ohm vs 8ohm drivers the BL is always lower on the 4ohm version yet performance is very close between the 2 different impedances when driven to the same SPL.

For example the B&C 18TBX100, a perfectly usable driver, 8ohm version has a BL of 25.5 but the 4ohm version has a BL of 22.0.
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