hello i am new on this forum.
and please dont look at the bad writing i am from the netherlands.
but i will do my best.

now my question to you guys.

i have 3 subs from the brand rockford fosgate.
type rfd 2210 these are 10 inch and dual voice coil 4 ohms 500 watt rms.
i have 3 of these subs and want to try to compete in an spl competition.
now they are playing in a sealed enclosure about 2,2 cubic feet.
now i want a ported enclosure with an high spl output.
every sub an own enclosure so 1 sub 1 enclosure
they are going to be powered by an rockford fosgate bd 1501 = 1500 watts at 2 ohm rms.
3 subs on 1 amp.
i know its not mutch power for these subs but its all i have.
can sombody calculate an enclosure for me.
i cant do it my self i dont hav the knowledge to calculate one.
the only things i have to know are the internal volume of the enclosure.
and the dimensions of the slothporth.

here are some technical spesifications of the subs i talk about

t/s parameters.
-----------------------------------------------------------
product name : rockford fosgate rfd 2210.
-----------------------------------------------------------
nominal diameter : 10 inch ( 254 mm ).
-----------------------------------------------------------
magnet weight : 102 oz ( 2892 gram ).
-----------------------------------------------------------
frequency range : 30 - 200 hz.
-----------------------------------------------------------
nominal impedance : 2 x 4 ohms.
-----------------------------------------------------------
dc resistance ( re ) : 2 x 2.10 ohms.
-----------------------------------------------------------
resonant frequency ( fs ) : 30 hz.
-----------------------------------------------------------
total q factor ( qts ):0.41.
-----------------------------------------------------------
electrical q factor (qes ) : 0.44.
-----------------------------------------------------------
mechanical q factor (qms ) : 6.32.
-----------------------------------------------------------
efective cone area ( sd ) : 54 inch 2 ( 0.035 m 2 ).
-----------------------------------------------------------
equivalent air volume ( vas ) : 0.99 feet 3 ( 28 liter ).
-----------------------------------------------------------
compliance ( cms ) : 1.60E - 04 m/n.
-----------------------------------------------------------
moving mass ( mms ) : 6.09 oz ( 172.7 gram ).
-----------------------------------------------------------
voice coil diameter : 3 inch (76.2 mm ).
-----------------------------------------------------------
voice coil winding width : 1.43 inch ( 36.3 mm ).
-----------------------------------------------------------
voice coil former material : 5 mm aluminium.
-----------------------------------------------------------
voice coil inductance : 2.10 mm.
-----------------------------------------------------------
force factor ( bl ) : 12.6 tm.
-----------------------------------------------------------
lineare excursion ( x max ) : 0.55 inch ( 14 mm ).
-----------------------------------------------------------
sensetivety ( spl ) : 85 db.

thanks so far

 

Your writing is a lot better than a lot of people on the net with english as their native language...

With 3 subs on one amp you'll be faced with some weird loads, 0.666 with everything in parallel or 2.66 if you series all the coils then parallel the woofers. If the amp is rated at 2 ohms it would be sketchy burping at .6, and 2.6 ohms (+impedance rise) won't quite reach its full potential.

It's hard to suggest a box for an SPL setup, you'll have to see what works I guess. Here's a calculator for port tuning: PORT Size Calculations and Formulas for WOOFER and Subwoofer BOXES

If you're serious about this, first you'll need to get access to a meter.

From a noob's perspective, I'd suggest starting with 1cuft. per box, and tune to 40 hz - make the ports pretty much as big as you can within reason. Play with the tuning by shortening the port and see how it does, then try bigger boxes and play with tuning... see if it gets louder or not. If not, stack some in the box to take up space, or make smaller boxes and repeat...

 

what do you mean by burping at an 0.6 load.
is it posible with this amp.
i now play at 2,66 ohms .
first wirerinng series and than paralel.
that it can be used for a short while on an 1 ohm load.
i know but 0,6 i think that is a little bit low.
and it is going to heat up my amp to much.

 

Yeah, I wasn't suggesting it, I was just stating that those 3 subs aren't really optimal for the amp, since they can either be run way under the recommended min. impedance, or a bit over it. 2.66 will have to do though.

 

what do you think could i hit 145 db with these subs or more.
or will i not even come close to that 145 db with these subs

 

It's possible but will take some work.

 

you might be OK running that amp at .667 ohms for burps, they are pretty resilient amps and if you are only burping around your tuned frequency you should be OK...

that said don't blame me if your amp blows up during a competition....



As far as the box... you should get a good idea of the frequency that gives the highest peak where you are putting the mic... look at response of a test box outside, and inside the vehicile and pick the frequency that had the largest gain...... you will need test tones and a spl meter...

download WINISD and play with volume/tuning to look for the box that will give the greatest peak at that frequency.....

your milage may vary but thats where Id start...

 

its already broken and is in repair now my amp
i had a strange kind off problem with it.
nowbody knew te answer on my problem .
now i have send it away for repair.
i know that they are used for burps at 1 ohm loads.
butt 0.6 thats a little bit to low i think
it will give a lot off power than maybe 2000 watts rms on 0,6 ohms.
but its a big risk to take