Hey guys.

I have just built a new box to basically take up the area of the backseat area in my pulsar hatch

the box is a wedge
71cm wide and 30cm high
Sub to the left.
40Litre
I wanna know if the box is to big.
can i put a port into it as i like tight and accurate bass(20-60Hz) and it a bit sloppy atm. and not very loud(1000RMS)

its about 21cm deep at the top and 30 at the bottom.

I'd suggest thet 40lt. is a bit big.

although, if it sounds sloppy it might be the box which is not strong enough.

no need for a port for tight and accurate, in a car there is plenty of 'cabin gain' to increase the low-end output.

so go down to a .9cf box sound good.....
its 16mm mdf....strong enought...ill put a few phone books in n c if it sounds better...cheers mate

the sub itself need a bit less than 1.0cuft not including the driver displacement... it performs very well...

sealed, 0.9cuft nett internal volume, as suggested, should be ideal for this sub. so, reduce the gross internal volume down to 1.0cuft, and after adding the sub, it will be around 0.9cuft nett.

300~500WRMS from a HIGH quality amp is ample power for this sub. so if it sounds 'lacking', perhaps your amp is not grunty enough. if it's the clarion, then...you could do better.

40L/1.4cuft gross is probably a bit small to convert to a ported box. more like 1.5cuft nett, so a starting size of around 1.7cuft/48L gross is what you'd want (then add port and sub to bring it down to 1.5).

16mm may also be of concern if its not braced, id only go 25mm or higher for any sub... or brace it, not only will the bracing displace some volume for you, youll gain obvious structural strength, and possibly better sound if thats whats causing

my sub is rated at 300 rms, its got 600 watts to it, and i use 32mm...

i got a sheet of 18mm mdf which ill double up on the front baffle.
18mm:$30
25mm:$60
i just not have the money

am building the box tomoro after work with the trusty table saw

external dimention are
H: 400mm
W 400mm
D: 300mm

I not sure what the top depth will be as it will have about 27degree angle with the seats....and it will be braced on the inside..

thanks for everyones help

yeah 500 w rms is plenty loud for idmax10

mind you.. when I changed my 500 w rms amp on the idmax10, to a 1200 w rms amp.. the difference was quite noticeable, the sub seemed to come alive a lot more

the clarion i have is designed by arc audio.
it will eventually have 1250watt@2ohm in the next few month

but currently at 1/3 volume it clips so yea.......not sure wat to do...apart from right box

Yes the boards are the same as the arc audio board but doesnt mean the quality is anywhere near as good. I think 500rms is more than enough for one of those 10s. Ive had mine hit 138 is a low peaking box. And if the woofer is in such a large box it wont need more power as the box should be quiet efficent. Wake a port into the thing and she'll be right.

You need to make sure the box is an acoustically dead enclosure, 18mm is fine as long as it is brace and well built, ie use wood glue and screws every few inches, and then silicon all internal joins just to make sure you have no air leaks. If you are going to laminate another layer of MDF to the outside of your enclosure be sure to use plenty of glue and screw to bind the two layers together.

But you have failed to mention the position of the enclosure and direction the sub is firing, both these two aspects can affect the performance of any Sub, try different loading positions and directions to find the optimal for your vehicle, typically the enclosure will be against the back seat in a hatch with the sub firing towards the rear of the vehicle.

Not all amps are created equal, the damping factor and thus the way you wire your sub/s (the lower the impedance the less control) can affect the control and sound that the amp has on the sub. A poor damping factor in an amp will result in poor performance, loose control, overhang and a general affect of not having nice tight deep bass.

ps if you dont want to rebuild your enclosure you could add fibberglass to the inside to improve it also.

it will be against rear seat firing into back of car.