I just got my new setup.. im really happy about it ....

i got two 12in Infinity Kappa 120.3SE subs http://www.infinitysystems.com/carau...er=KAP&Cat=SUB

and Infinity Reference REF610A amp http://www.infinitysystems.com/carau...er=REF&Cat=AMP
i want to make my own sealed box.....

i did some research ... dosnt look so hard

on the inf site it shows that the one sub works in 1.00Ft3




i did some calculations
and a box for one subs comes out to
Depth = 7.2 inches
Height = 19.44 inches
Width = 12 inches
and the sub cut out .. the hole .. should be 10.94"??


I want to make a box for 2 subs ....
what should i do??

just 2x the Width ??
or make 2 single boxes and just screw then together side buy side??

I know i can just go out and buy a box .. but ppl tell me making your own will make the subs sound better

thank you
-bert

 

For two subs, just double the volume to 2 cubic feet. You can work that however you like by altering the width, height, etc. I checked your measurements and they come out close enough (.972 cubic ft or 27.5 cubic liters). Doubling the width will certainly give you double the volume. Have you considered a ported box? If you double the volume of the pox and port it with a port of 154 cubic inches, you would (on an average) double the output of the speaker. The ported box is more efficient, but the freuency response won't be as flat as the sealed box. With the ported box as specifiied, you will have a peak at about 30 Hz. Many people like this as it adds a little 'thump' to the system. If you did build the ported box and found it had a little too much peak at the resonance frequency, you could adjust the port size or, even easier, just add more accoustic foam to the box.

Yes, the cutout would be 11 inches for each sub.

Making your on box doesn't necessarily make the sound better (unless a purchased box is a poor match for the speakers), but it does make you feel better sometimes. And hey, since we know you got a truck, going to Home Depot and getting some plywood shouldn't be a problem. Also, it is much easier over the last few years to get the parts for box building (tuned port tubes, accoustic foam, carpeting, speaker grill guards, speaker terminals, etc.) Much of this is available from places like Crutchfield.

Hope this helps.

 

thanks for your help


many people tell me that sealed box is much better..... and much easier

I mostly listento rap and sometimes techno.

I just want good deep bass that will shake the car

i did another cal with 12x12x12 and that comes out to be 1ft3.... i can just make 12x12x24.... would that work??

And i Know with that setup i got i wont get very deep bass .. but i only paid 300dollars for that system cant get any better

 

Considering your music preferences, I'd strongly recommend a ported box, if you got the room. A sealed box isn't any easier to make than a ported one (one extra hole to drill for a ported box). Sealed boxes can deliver great bass, no doubt about it, but they are less efficient and require more power for the same output SPL. With the components you have, you can considerably deep base, considering you can set the resonance at around 30 Hz - most people can't hear far below that anyway and lower frequencies are longer wave lengths that are longer than the distance between you and the sub anyway - the guys next to you at the stop light would hear more of those very low frequencies than you would.

 

Ok ill try to make a Ported box.... will it fit in my trucK??



and can you tell me the size of the box????



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And i found these graphs .. what do they mean???

 

Building a ported box is much more involved than just cutting an extra hole for a port. It has to be built very precisely for the sub used and the vehicle used in. If not it can actually affect performance adversely up to even destroying a sub. And a ported box is effective over a very narrow frequency band, in comparison to a sealed box. They are suited for people who want that deep, monotonous, droning thump that you hear from 2 blocks away. If you want sound quality, go with a sealed box. If you do build a ported box, go about it correctly. It can be quite complicated if you take your time and do it as it should be.

http://www.caraudiomag.com/technical/0203cae_box2/

 

cant i just buy a made ported box ??

 

How about this box??
http://www.cardomain.com/item/OBCGZ32812


i found some nice boxes on ebay .. much cheaper

 

Building a ported box for these subs is not that difficult. The OEM published good specs that make it pretty plain as to what the volume of the box and ported tube need to be. The box can be virtually any desired size, as long as it maintains the required volume and leaves a couple of inches between the end of the port tube and the back of the box. The frequency response range is equal between the ported and sealed box. The pre-fab box that you've selected will fit your vehicle easy enough, but it isn't an exact match for your subs. However, pre-fab boxes seldom are. The box you're looking at lowers the per-driver volume from 2 cubic feet down to 1.56 and increases the port volume (no specifics as they didn't give the volume in the specs). Since it varies from the manufacturer's specs, it would be difficult to tell how well it would perform without doing some serious math and we'd need to know the ported chamber volume of the box to do that. It is hard to find generic, fre-fab boxes that are a perfect match for subs unless the box was built with those subs in mind. Ported boxes do complicate this as using sealed boxes is a little more foregiving on the exact enclosure volumes being used. Probably your speakers would still sound fine in this box. If you wanted to build an exact match, you can use some easy references on the web, such as: http://www.diysubwoofers.org/prt/

 

I agree that it isn't necessarily "difficult" to build a ported box in comparison to sealed. But, building it to precise specs is much more critical, IF optimum performance of the sub is important. Any deviation from recommended port or box dimensions can greatly affect that performance. The vehicle is also important in that performance. Maybe I'm being too hardline about this, but I believe a person should be patient and take the time and pains to do what it takes to get their gear to perform to its optimum. To me it makes no sense to buy nice equipment and make it perform at anything less than that. But it happens all the time. But, having said that, each of us should do what we want. And I think the prebuilt box is not a very good idea.

 

thanks for your help guys

i was thinkin and i will make a sealed box.....
after looking at the graphs the sealed looks better to me ..
I emailed INF and they said for subs .. sealed is the best choice

thank you