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View Full Version : Single HDC3 10" Box



SPLluminator
04-20-2009, 07:57 PM
Ok, well ive tryed with two HDC3's but im not getting very good #'s due to the fact that i have only one 20.1 powering them at 1 ohm. I was wondering what you guys thought of a single 10" HDC3 with the 20.1 at .5ohm. I was thinking like .75-1 cubic ft @ ~50hz for burps. I need something small because of the power the amp will put out. I realize its too much power for daily, but for burps i would expect this lil monster to hold up for a while. This is just for ideas. Also, what about a kerfed port. I saw Sundownz was getting some luck with his 15 and a kerfed port. Another thought of mine was a aero port with a loading chamber. Just a thought, idk how it would do for spl. Thanks for any suggestions or help.

O btw, i have a Lumina. I was gonna try a bunch of different things. Whether its trunk sealed off, or sub up port back or sub forward port back and so on.

da box king
04-20-2009, 07:59 PM
wanna sell your other ten?

SPLluminator
04-20-2009, 08:08 PM
Hmm, idk. Id like to keep it around for a backup. Plus i might run 2 for daily. But it never hurts to send an offer.

da box king
04-20-2009, 08:19 PM
Hmm, idk. Id like to keep it around for a backup. Plus i might run 2 for daily. But it never hurts to send an offer.

my buddy may be interested....and as for yur port, kerfing may help, but probably not to the ear. If you want to score big, tune a box to around 46-50 hz and burp that bish

2k rms for 2 10" hdc3's should be enough tho, lower yur tuning for daily, and it will be louder to the ear

SPLluminator
04-20-2009, 08:46 PM
my buddy may be interested....and as for yur port, kerfing may help, but probably not to the ear. If you want to score big, tune a box to around 46-50 hz and burp that bish

2k rms for 2 10" hdc3's should be enough tho, lower yur tuning for daily, and it will be louder to the ear

Well i dont care to the ear for SPL. I care about the meter for one setup. Ill prolly have two setups that are separate. The other will be at 38hz for the lows. ill do the loading port with that setup and an 4" Aero. I like trying different things, so i thought id try that for daily.

da box king
04-20-2009, 09:15 PM
Id even recommend goin lower than 38 hz, but no lower than 35 hz. I got mine at 35hz and love it, lows are so much better. And tuning it lower will eaily help those tens get lower easier

SPLluminator
04-20-2009, 09:18 PM
Yea, but ill be happy with 37-38. Im listening to it at 48hz now and it doesn't seem all that bad.

thorshammer1
04-20-2009, 09:24 PM
I've been limited with tuning lower and adding power. LOL personally I wouldnt recommend lower than 38 and only up to a clean 2-2500 for short periods daily.

I'd concentrate on the current set up and try another box, bigger port, sealing etc.. Then add another 20.1 down the road and work on your gains with power etc..

SPLluminator
04-20-2009, 09:27 PM
I've been limited with tuning lower and adding power. LOL personally I wouldnt recommend lower than 38 and only up to a clean 2-2500 for short periods daily.

I'd concentrate on the current set up and try another box, bigger port, sealing etc.. Then add another 20.1 down the road and work on your gains with power etc..

Thats what i heard as well with the 38hz tuning. Thats why i said i wouldnt wanna go lower. But i would run 2ohm daily .5 ohm for comps

da box king
04-20-2009, 09:31 PM
4k + here at 35 hz :)...took a bit to keep them from warmin up tho, but its all good now

SPLluminator
04-20-2009, 09:39 PM
So anyways, what should i do for box size. I was thinking in the .75-1.25 cubic ft range (for the spl box)but thats a big range, id like to narrow it down a bit.

For the daily box im thinking 1.5 @ 38hz with a loaded port. So thats set in stone

hawaiianmaxx
04-21-2009, 01:37 AM
I've had luck with about 1.25ft^3 net and a single 6" aeroport(external). We've competed/tested this box in two different Blazers on different power. First Blazer did 143.8db on a 1500w amp at 1ohm in competition. Second Blazer did 148.4db on two 1500w amps strapped at 1ohm in testing. Scores were done with TL sensor on passenger windshield cars sealed.


ALOHA FROM HAWAII,

SKY

SPLluminator
04-21-2009, 07:15 AM
Well that would be easy enough. Idk how that would perform in a trunk tho. But i may have to try it.

SPLluminator
04-21-2009, 04:10 PM
I wonder if i did something like what Thor did where basicallt the trunk is mdf. Then put the box facing back inside it. Not sealing it off at all, leaving as much room as possible for airflow.

cj407
04-21-2009, 04:17 PM
4th order with port thru the rear deck is the way to go in a trunk car.....

michaellane
04-21-2009, 04:26 PM
im in the same problem...im thining that my new box will have the port firing directly into the car cabin when i have the seats folded down at comps...but right now the box is 2.5cubes before displacement and tuned @ 37 hertz...i think my next box will be tuned to to like 41hertz

SPLluminator
04-21-2009, 04:33 PM
4th order with port thru the rear deck is the way to go in a trunk car.....

Id do it but i have absolutly no clue on how to design bandpasses. Is anyone able to help me in the process? Also, i have enough money/time to build up to 5 boxes or so. I could build more but then i start to run into lazyness. If i could try a bandpass, and one thats 1.25 with a 6in aero. What else. One will be a daily box tuned to 45hz for both subs. What else can i do to get the most out of my car? Im thinking of sealing it off. Ill try different box positions whether its firing sideways, up, back, or forward. Now what else.

I kinda started late on this project. But im gonna be zooming here pretty quick. Competitions are coming up and some have passed. Im going to be competing in Meca and Bass Race. Id like to do the lowest class in meca (amatuer 0-500, i think is what it is) and compete well in the 39.9 class.

SPLluminator
04-21-2009, 06:02 PM
Who can help me with bandpasses. Or does anyone else even recommend a bandpass?

SPLluminator
04-22-2009, 08:28 PM
Looks like i may be getting a Sundown 3k or AQ 3500d. So i may stick with the double sub setup. Im going to be picking up a hawker HX300 soon for up front and ill put my other two runs of 2/0 in(ill have 2 positive and 2 neg). Then ill start on a new box tuned to 45 hz, its Just a lil over 3cubic ft. Ive got to somehow find the Res. frequency of my car. Once i do that, ill build a new box with a kerfed port tuned to the res. frequency. Ill also be building door pods for 2 sets of RSD's in my doors. Then i think ill be set for a few months.

SPLluminator
06-20-2009, 08:53 PM
Pk this has been a while. I got better #s with 45hz at around 3 cubes(2 subs). But i need to go bigger with the port. I need a lot more port space. Also, i am going to be building a single sub box. Im going to be trying something a little different for trunks. Im gonna do port back sub sideways. Im curious to see how this turns out. Ive still got the 20.1 but it shoudl give the sub a good 2400 at .5 ohm. I know they were a lot louder when i dropped my amp to .25ohm. But that was for short bursts of music.

Skip01
06-20-2009, 08:57 PM
So wait...what do you have?

2 10 HDCs and 20.1?

In a trunk car?

What numbers are you doing now?

SPLluminator
06-20-2009, 09:16 PM
So wait...what do you have?

2 10 HDCs and 20.1?

In a trunk car?

What numbers are you doing now?

Yes, Yes, and a weak 143.xx

And yes ik, im sure i could fart louder than that. Its really the car holding me back the most.

Skip01
06-20-2009, 09:26 PM
What car?

143 on dash legal?

Skip01
06-20-2009, 09:27 PM
pics of box?

RAM_Designs
06-20-2009, 09:34 PM
Sealing off the trunk and firing sub/port forward works really well...ask wildsebring on here, I think he ended up with mid 151's outlaw,with a single 12" Soundstream SPL-X and a pair of SAZ-1500's.

SPLluminator
06-20-2009, 09:43 PM
What car?

143 on dash legal?

99 lumina and Yes.

Skip01
06-20-2009, 09:46 PM
Thats not bad for legal.

I was doing like 143-144ish with 1 15R in my Civic with a SS2000.


Im gonna be getting going with my new Civic project soon, few new designs im gonna try out that should work nicely.

How you firing them now?

SPLluminator
06-20-2009, 09:58 PM
subs forward port forward. I would like to see 146.xx with 2 10's. or 145 with a single 10 with my amp i have now.

Skip01
06-20-2009, 10:03 PM
Yehh, you could prolly get close too that...trunk cars **** balls sealed up though, from my testing....too bad you dont have USACI or MECA up there....kick that door open and BAM, 2 -3db gain haha

Id try subs forward, ports drivers side...and box as far back as you can get it....and try subs back port side with same box by flipping it around , etc....one of those should work out


Be easier with more power too haha, but you could get it with good box.

SPLluminator
06-20-2009, 10:11 PM
Well at .25 im prolly getting close to an actual 2k after imp. rise(depending on voltage drop). We do have meca up here but not very often. The problem with boxes for me is i dont have very much space to move the box after i mount the amps. And i dont want to mount them on the box. So idk where to mount them. I may end up buying a blazer soon tho. Then the db's will come, lol.

Skip01
06-20-2009, 10:12 PM
Indeed.

Whats wrong with mounting on the back seat?

or along the sides of the trunk ?

SPLluminator
06-20-2009, 10:14 PM
Indeed.

Whats wrong with mounting on the back seat?

or along the sides of the trunk ?

Sides are all curvy and messed. The seats dont fold down stock. I have them unbolted tho. So i guess i could mount there. But its not very sturdy(just foam). So i just got the worst car possible.

Skip01
06-20-2009, 10:15 PM
Yehh...that ***** haha.

Get that blazer than ya can throw anything in it and do a 49 all day ha

SPLluminator
06-20-2009, 10:16 PM
Yehh...that ***** haha.

Get that blazer than ya can throw anything in it and do a 49 all day ha

Yea im looking. Or if i could find a clean crx:eek:. Cheater car imo:laugh:

Skip01
06-20-2009, 10:16 PM
Yea im looking. Or if i could find a clean crx:eek:. Cheater car imo:laugh:

Yehh no fun with CRXs....just bzzzzzz than go park ha

SPLluminator
06-22-2009, 07:14 PM
Also, how do you figure out tuning on a box. Ive just been using box calculators but id prefer to do it myself. Link?

SPLluminator
06-22-2009, 08:55 PM
Anybody?

SPLluminator
06-22-2009, 09:06 PM
Nvm, found one.

http://www.carstereo.com/help/Articles.cfm?id=31