I plan on buying 2 Rockville RVW1800P4 18 inch subs and would like to tune to 30hz. I plan to put them in seperate boxes and they are going to be used in my house so i dont care if the boxes are big. Ive never built a box before so im new to all this. I listen to rap and hip-hop mostly. Would it be good to tune to 30hz? I want to be able to hit really low notes well. Could anyone help me out with a box design that will get the most out of these. I know they're cheap but im on a budget and its just for me not for shows or anything.
Thanks.
Thanks.
I am a fan of finding deals and using lesser named stuff, but if the mfr doesn't even post T/S specs online, I would look elsewhere personally. That is not to say if you get them and build a box they won't make noise. I would take a look at these: Dayton Audio DCS450-4 18" Classic Subwoofer 4 Ohm or even jus the 15 to save dough... The site even gives you ideal parameters for the build.
Agreed, but curiosity got the best of me, so PM'd them for the specs of all their prosound drivers, especially the two 18".
GM
GM
If you only want to get down to 30Hz I have a pair of Polk 12" DB1240 SVC drivers I would sell you for less than the price of a single one of those Daytons.
If my calculations are correct they should be able to hit a -3dB of around 26 Hz in a ported box of about 3.4 ft3, which is quite a reasonable size for 26Hz.
T/S are in the datasheet if anyone wants to double check me on that. I know they are car woofers but they are actually quite suitable for hifi use.
http://www.polkaudio.com/Media/POLK/Product Manuals/dbSub_MN.pdf
If my calculations are correct they should be able to hit a -3dB of around 26 Hz in a ported box of about 3.4 ft3, which is quite a reasonable size for 26Hz.
T/S are in the datasheet if anyone wants to double check me on that. I know they are car woofers but they are actually quite suitable for hifi use.
http://www.polkaudio.com/Media/POLK/Product Manuals/dbSub_MN.pdf
Might be worth it to buy one and test it with DATS. Someone on Amazon posted a pic of the ts parameters. Lots of red in bassbox pro so I suspect they aren't accurate. I ended up using a PRV 15W700 sub for my build, much better numbers according to Bassbox.
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Thanks, though 8 ohm, which theoretically will be close: Amazon.com : Rockville RVW1800P8 1800w 18" Raw DJ Subwoofer 8 Ohm Sub Woofer 240OZ Magnet : Electronics
The posted specs are a bit bogus since BL, Mmd are way off relative to the T/S specs, but the only difference is vent length and of course two different tunings, though ideally this would be empirically determined to best blend in room.
They claim a high Xmax, but its accordion surround pretty much limits it to ~5 mm, so 80-100 W usable power handling below ~70 Hz, though this is still ~115 dB/m/2 pi space in ~14 ft^3 tuned in the ~22-27 Hz range with a 10" dia. tube ~13 - 23" long depending on which of the 8 ohm driver's specs are most accurate.
If the drivers have a higher Qts, then worst case is you have to either damp the vent or seal it up completely.
GM
The posted specs are a bit bogus since BL, Mmd are way off relative to the T/S specs, but the only difference is vent length and of course two different tunings, though ideally this would be empirically determined to best blend in room.
They claim a high Xmax, but its accordion surround pretty much limits it to ~5 mm, so 80-100 W usable power handling below ~70 Hz, though this is still ~115 dB/m/2 pi space in ~14 ft^3 tuned in the ~22-27 Hz range with a 10" dia. tube ~13 - 23" long depending on which of the 8 ohm driver's specs are most accurate.
If the drivers have a higher Qts, then worst case is you have to either damp the vent or seal it up completely.
GM
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Greets!
Hmm, the only specs I've seen are for the 8 ohm listed on the posted Amazon site, which equate to 0.47 using T/S and 0.45 using Cms, BL; with Fs shifting from the published 25.02 Hz to 30.87 Hz using HR.
As you know, 4 ohm drivers typically have nearly identical T/S specs to their 8 ohm models, so very curious how you arrived at a 0.2 Qts.
GM
Hmm, the only specs I've seen are for the 8 ohm listed on the posted Amazon site, which equate to 0.47 using T/S and 0.45 using Cms, BL; with Fs shifting from the published 25.02 Hz to 30.87 Hz using HR.
As you know, 4 ohm drivers typically have nearly identical T/S specs to their 8 ohm models, so very curious how you arrived at a 0.2 Qts.
GM
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