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PostPosted: 19 Jun 2019, 05:16 
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Joined: 16 Jun 2019, 12:17
Posts: 4
Hi Guys
Does any one have pans or drawings for a dual driver sub using 18” drivers.
I will be using a Dayton UM18-22-18.
Cheers
Adrian


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PostPosted: 19 Jun 2019, 17:18 
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Joined: 23 Feb 2017, 02:02
Posts: 559
I googled the one up and within 60 sec I found the drawing
https://www.parts-express.com/dayton-au ... l--295-518

https://www.parts-express.com/pedocs/sp ... -sheet.pdf


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PostPosted: 19 Jun 2019, 17:31 
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Joined: 23 Feb 2017, 02:02
Posts: 559
https://www.avsl.com/product/902.512UK- ... nt-drivers
At 1w Dayton UM18-22-18 has a volume average of 88.6dB
1w 902.512 has average of 101dB

Subtract the db 101-88.6 = 12.4dB more power required to get same volume as the 902.512
Anti log the one, 10^(12.4/10) = 17.378 times more power to get to same volume as 902.512
(Re log the one to check right answer, 10 log 17.38 = 12.4dB)

This means to get same volume as 902.512 at 1w, you need to feed dayton 17.378W
Theres zero point in buying the dayton, senstivity too low

902.512 max power 350w rms, dayton 1000w rms
Outright volume 1000W/17.378 = 57.544W
Dayton with 1000w power input has only the volume of 901.512 with a power input of only 57.544W

350*17.378=6082W
This means if you fully drive the 901.512 you get the same volume as dayton with 6082w of drive.


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PostPosted: 19 Jun 2019, 18:39 
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Joined: 23 Feb 2017, 02:02
Posts: 559
The thing that tends to happen with low sensitivity speakers is that it ignores the poor amp quality and sounds fair.
But the high sensitivity ones usign little power sound very loud. These have the disotrtion emphasised and you need really good amps to get really good sound.


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PostPosted: 20 Jun 2019, 21:56 
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Joined: 16 Jun 2019, 12:17
Posts: 4
Thanks for the advice , I am new to the DIY projects. I have excellent cabinet skills and was trying to save space by going duel.
But after your advice and experience have decided to bin that idea.
The cabinet size I can work with is 525mm wide 525mm deep and 900mm high obviously l have room to go higher but don’t want the sub to stick out like a sore thumb this works out to be about 6.7 cubic feet after adding all the bracing etc.Personally I don’t care how tall it is but the minister of no fun has to be kept happy also.
I am thinking of a single 18” HTS driver in a ported box . I know this volume is not ideal but do you think it’s possible and what amp would you recommend.
Thanks everyone for there comments .
Adrian


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PostPosted: 03 Jul 2019, 16:16 
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Joined: 23 Feb 2017, 02:02
Posts: 559
If your making a base, never go for sealed enclosures, because this will reduce the base.
Sealed or open baffles are for full range speakers so the base and midrange will not be amplifed by box and so you can have entire frequency range wihout added tweeters


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