Volume of drivers + amp

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#2
fb said:
Could anyone tell me what volume is taken by a Peerless XLS12, XLS12 passive radiator, and a PE 250 watt plate amp (300-794)?

I've taken a guess with 2, 1 and 1 litres respectively. Close enough?

Thanks.
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http://www.d-s-t.com/link/peerless/data/pdf/830500.pdf gives the speaker dimensions; from http://jwilson.coe.uga.edu/emt725/Frustum/Frustum.cone.html my rough calculation is 3.6 litres. Is the amplifier from Parts Express? http://www.partsexpress.com/pe/pshowdetl.cfm?&PartNumber=300-794&DID=7 ? I figure 4 litres; less for both if you take into account the thickess of the cabinet. And I may have it all wrong! The main reason I'm replying is that I notice you are in Brisbane - where are you obtaining the parts from? I'm thinking of something similar myself. What box design are you making?

Bob Long
 
#3
Hi. I ordered the Peerless parts from http://www.digitalmegahouse.com.au/speakers.html
Shipping was $11.
830500 $289
830548 $155

Amp will be ordered from Parts Express as soon as my credit card arrives. Approx $280 delivered I think it will be.

I'm making a 54 litre passive radiator, WinISDpro design is attached.
You're welcome to have a listen once mine's done. I guess I'll just aim for between 54 and 60L, unless I can get an exact answer.
 

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#4
fb said:
I'm making a 54 litre passive radiator, WinISDpro design is attached.
You're welcome to have a listen once mine's done. I guess I'll just aim for between 54 and 60L, unless I can get an exact answer.
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Thanks for the info. Let us know when they have been constructed. I'm not sure when I'll get to mine. I've not even ordered anything yet. Still not decided among vented/sealed/PR (but cost is a factor for PR). As far as the calculations go, have you been able to work anything out more exactly from those links?

I'm no expert, but there did not seem to be any significant difference in WinISD going from 54 to 60 litres.

Bob Long
 
#5
oblong said:
As far as the calculations go, have you been able to work anything out more exactly from those links?
Click to expand...

Not really thanks, my knowledge of geometry isn't sufficient to make some of these calculations when some data isn't available. I was hoping someone might have measured, or have a standard method for estimating volumes.

I guess I'll just have to rely on the fact that there are only minor differences (as far as I can tell also) between 54 and 60L.
 
#6
fb said:
Not really thanks, my knowledge of geometry isn't sufficient to make some of these calculations when some data isn't available. I was hoping someone might have measured, or have a standard method for estimating volumes.
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According to http://www.maximacar.com/calculating_volume.htm "The basket displacement for an average 12" woofer measures 209 cubic inches." That is 3.425 litres (http://www.convert-me.com/en/convert/volume), so my initial quick calculation of 3.6 l appears pretty close.
 
#7
Some time ago, I researched speaker volumes for some software I was writing. I searched the net for specs that included volume for a range of speakers and then averaged the results.

The figures I settled on were:
10 inch driver - 1.5 litres
12 inch driver - 2.5 litres
15 inch driver - 4.0 litres
18 inch driver - 6.5 litres

might be of use....
 
#8
Thanks for your help both of you, MDF has been purchased ($52 for 2x1200x900x16 from Chermside Building Supplies). Net volume will be somewhere between 48 and 52 litres, which won't affect the design significantly.
 
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