amangujral06

already have those , cdt 062i with extended midbass version , getting 200 watt rms @ 80hz 12db .

playing the sub flat from 30-100hz is my main concern ! I can live without the hard hitting punch , but cannot without my upper midbass .

This box is already made now, and this design is finalized as it acts as my rear seat too. . It has a little more than 4.5cu ft volume and 54sq inches of port area . I can change the port length to vary the tuning but i once read it on Hertz subwoofer manual , that if its a slot port box and the port is along the wall then , we have to keep it 30% shorter then calculated to achieve the tuning frequency ! else it gets tuned even lower - well it makes perfect sense ! If i go by hertz audio suggestion - it means my current box is also tuned much lower than what i intended it to be.. I too also wanted to tune it to 35hz but was scared to make my sub bottom out at tracks having below 35hz content . I really dont know what to do ! music was om much simpler to enjoy in 80s-90s . and does the car tuning frequency play a role with a box design , for it to play flat ?

Hi , been a long time since i made up my new box - so here it is ! a revised box , now tuned at 33 hz ! The cad design The box starting to take place Making those angles wouldn't have been easy for the carpenter. the part that will make it all happen ! and there it goes in the box... a channel provided - for future expansion . a panel can be added in the channel though to change the tuning frequency ! an inside view of the magic port .. another view weapons of mass destruction will upload some more pics with the sub in it and the bracing that was added later . Now i decided to tune it at 33 hz and decreased the port length to tune it at 33hz. the box can really move some air , but it lacks the music capability ! its not punchy , a little slow and tends to become boomy . i have tried various different configurations passing it at 80hz at 12db slope, at 63 at 6/12db also at 50 and lower with 6/12db slopes . subsonic s at 25hz and ts being powered by a blaupunkt vpa 1500pro mono amplifier , which delivers 1500rms@ 1 ohms . so here is my next question to you -------- What frequency should i tune the box to , make the sub more snappier and punchier ? also to decrease its boominess .

that will be very difficult

its going in a hatchback. This is for the 15" . In my testing with port placement, i found, i get the loudest output when port is facing horizontally, rather vertically.So i went for this configuration. the sub will face the boot lid and the port will face the front wind shield.

round the port corners, yes that is a good suggestion, i'll def do that. and put 45's in the port - please enlighten me on this. had to use those odd angles, else i wasn't able to achieve this volume or tuning . I just hope odd angles won't effect how the subwoofer response. The worst part was to accommodate the slot port. I had tried over 10 designs for the same.

The port is forward firing. Its going n a hatch back, removed the rear seat and will be cushioning on the port wall so as to keep it look stock.

Hi guys, here is an attached pic of the box i'll be soon going to get made, Using .75" MDF and .5" mdf for inner port walls. The box shape will remain unchanged, took many hours to decide the slot port for this. And new suggestions opinions are welcome.

I'll keep that in mind

thanks scott !!

Just like the question says, what is the Motor Diameter of havoc 15? couldn't find anywhere, if you guys have it outside the box, please measure and tell . if measuring dia is difficult, just tell me the circumference. thanks

after explaining a simple fact of science you still don't think that a hotter coil has higher resistance! then there is nothing left to explain anymore . good luck

Have you taken impedance drop due to playing below tuning into consideration? No, No, No. and one more No. What? Impedance rises before and after tuning. Pick up Loud speaker Design cookbook or WinISD and look at some resistance / frequency graphs. Also a speakers impedance is never going to drop below its measured/rated impedance especially with power applied (unless the speaker fails). OP do not count on impedance rise, set gains accordingly, use a different amplifier, or use a different speaker. who said anything about impedence drop ! impedence rise due to box rise dude, box rise! when coil gets hotter , its resistance increases (coil is made of metal isn't it) - Pick up Loud speaker Design cookbook or go meet an electrical engineer ! Just having more no. of posts on one forum doesn't bend the rules of science . Do one thing, buy a good multimeter (or borrow it from that electrical engg. ), set it to measure the resistance, play a decent song with variable low ocatves and see what actually happens outside WinIsd - you'l be surprised what you know till now.

who said anything about impedence drop ! impedence rise due to box rise dude, box rise! when coil gets hotter , its resistance increases (coil is made of metal isn't it) - Pick up Loud speaker Design cookbook or go meet an electrical engineer ! Just having more no. of posts on one forum doesn't bend the rules of science . Do one thing, buy a good multimeter (or borrow it from that electrical engg. ), set it to measure the resistance, play a decent song with variable low ocatves and see what actually happens outside WinIsd - you'l be surprised what you know till now.