Is this enough info to build a sub?
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=31801
Printed Date: June 11, 2024 at 6:17 PM
Topic: Is this enough info to build a sub?
Posted By: mrdragon
Subject: Is this enough info to build a sub?
Date Posted: May 08, 2004 at 3:41 AM
Hi guys, I just wondering with the following info can someone able to decide what is the right size box for the sub??? i thinking of a seal box but need to measurement and i can't find the manual fo the sub. The sub is Cerwin Wega 10"
The parameters are:S-10D
Fs 58
Qes 0.761
Qms 6.081
Qts 0.677
Vas 0.747 cu ft
Xmax 0.314"
PE 75 watts rms per coil
Thanks :)
Replies:
Posted By: DYohn
Date Posted: May 08, 2004 at 9:30 AM
Try THIS calculator. It's fun. Read the "help" page for explanation, and remember the volume results given are in litres. Fs = 58Hz? Hmm, that sounds more like a woofer designed for a 2-way stereo main application and not a subwoofer.... ------------- Support the12volt.com
Posted By: mrdragon
Date Posted: May 08, 2004 at 4:49 PM
Hi again, I did enter all the info Vas = .0747, Qts = .0677, Fs = 58, Drivers = 2...........and the result is Closed: Vb: 16.49, Qtc: 0.707. Now how do what out how big is the sub going to be....if possible can you work it out for me as well??? Thanks once again :)
Posted By: mrdragon
Date Posted: May 08, 2004 at 5:05 PM
Hi sorry forgot to ask you this ...is the sub i got at the moment worse buiding?? coz i ain't i rahter get a new one! Cheers :)
Posted By: DYohn
Date Posted: May 08, 2004 at 5:35 PM
First, you have to convert the Vas number to litres. (cuft X 28.32 = litres) This results in a sealed enclosure size of 171.2 litres per sub (that's 6, count 'em 6 cubic feet PER sub.) And with an Fs at 58Hz, your enclosure resonpse is crap below 90 Hz. NOT a good woofer for a sealed enclosure . Ported is much better, with an enclosure almost half the size (3.9 cuft per sub) and a tuning frequency of 34Hz. Are you SURE you have the specs right for this woofer? What model CV is it?? ------------- Support the12volt.com
Posted By: mrdragon
Date Posted: May 08, 2004 at 6:00 PM
Hi i am sending a pic sub maybe you can help me to find the manual, i been looking for the manual on the net for a long time but with no luck. it's a DVC sub. Sorry i just read the size restriction only 30 K...let me send it again....if i did send it pls forgive me its a mistake ok?? Thanks :)
Posted By: forbidden
Date Posted: May 08, 2004 at 6:05 PM
Can you post this info on CAA as well or is it already posted there? ------------- Top Secret, I can tell you but then my wife will kill me.
Posted By: mrdragon
Date Posted: May 08, 2004 at 6:08 PM
Posted By: mrdragon
Date Posted: May 08, 2004 at 6:21 PM
Guys thanks anyway for all the help....i am thinking of getting a 12" sub....just so sick of looking for the spec since this sub is more than 10 yrs old. Thanks once again for all the help guys :)
Posted By: forbidden
Date Posted: May 08, 2004 at 6:33 PM
Car Audio Australia....... Once in a while I need to go on a vacation and post there as well, with the same name of course. A 10 year old sub, use it knock out that Croc and get yourself a new sub.
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Top Secret, I can tell you but then my wife will kill me.
Posted By: stevdart
Date Posted: May 08, 2004 at 7:19 PM
The specs for this woofer indicate that the impact of the sound would be too weak to warrant the building of an enclosure specifically for it. It is just not good enough. It may have been designed for something other than car use. Don't you have something to select from? I go with forbidden with the Croc bait idea. ------------- Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.
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