A little HT/Thumper Project

[Rapatari 0]

Consists of a 12" Dayton Titanic mk III and a Dayton HPSA500 for power. Box will be around 3.5 cubes tuned to 25 Hz with 3 4" aero ports. Should sound pretty good hopefully. I will try to get some pics of the build but in the mean time, thoughts/input?

[Rapatari 0]

Actually now that I think about it, I want to do 4 3" aero ports. Sub front firing and ports front firing in the 4 corners around the sub. the only thing is I dont know how long they need to be to get the tuning I want... I used the psp-inc.com calculator and got this:

Volume of Box in Cubic Feet: 3.5

Tuning frequency: 25 Hz

Port diameter: 3"

Number of Ports: 4

Straight Length Port required: 32.64

Flare Length Port required: 33.64

How do I look at that and know what each port has to be?

[///M5 2,833]

Each port has to be the length that you already listed. 33"

*you don't need so much port area

**you aren't tuning low enough

[Rapatari 0]

Each port has to be the length that you already listed. 33"

*you don't need so much port area

**you aren't tuning low enough

Ok, only reason for that tuning is because I plan on feeding it music more so than movies. What would you suggest for a port configuration?

Thanks for the input.

[///M5 2,833]

You titled your thread HT, which is short for Home Theater, so perhaps you need to restate your goals. Curious on why you chose the Titanic as well.

[Rapatari 0]

Thats also why I threw Thumper in the title guess I should have just said music... I guess I chose the titanic because I wanted it to show up the same time the amp did and people have said good stuff about the driver so I went for it.

[johnecon2001 82]

If you're using flared ports, each one needs to be 33.64" long.

[///M5 2,833]

Considering you want to do both music and HT you could get a larger sub and keep it sealed.

[Rapatari 0]

If you're using flared ports, each one needs to be 33.64" long.

Ok, I understand that now. I wonder if I can get away with one 4" flared... vent mach on winisd is 0.11 and it should be even lower because of the flare correct? And I would only need a total length of 13.56.

[dem beats 1,223]

Considering you want to do both music and HT you could get a larger sub and keep it sealed.

Ding ding ding

Give the man a cigar.

[Rapatari 0]

Considering you want to do both music and HT you could get a larger sub and keep it sealed.

Hmmm, I would but I don't want to buy another sub... I mean I guess I will be doing more music out of it than anything but I just want to have a better low end all around because the little Aiwa powered sub I have now is garbage. So if I have to raise the tuning a little I will do so.... 27-30Hz maybe.

[dem beats 1,223]

I'm confused, what equipment do you have/have already purchased? The whole kit? If you already have all the gear are you just asking how to tune it?

If you can sell and upgrade and have a budget maybe we can help you with something else.

[Rapatari 0]

I'm confused, what equipment do you have/have already purchased? The whole kit? If you already have all the gear are you just asking how to tune it?

If you can sell and upgrade and have a budget maybe we can help you with something else.

I have the sub and amp, and planning to build a box. I don't want to upgrade if at all possible, so I think I am just gonna try 3.25 cubes tuned to 25Hz and see if I like it... if not I will build another.

[///M5 2,833]

Which amp? It needs a serious subsonic if you tune that high otherwise movies are going to make that thing destructively unload.

If those are really your goals, buying a bigger sub selling yours and running sealed will give you a way better response.

A 12 isn't really "big enough" for HT in the first place, then putting it in a highly tuned box will kill it if you throw any power on it.

[Rapatari 0]

The amp is a Dayton HPSA500 http://www.parts-express.com/pe/showdetl.c...tnumber=300-806

[///M5 2,833]

I wouldn't use that amp with that sub ported at 25Hz.

Only choices are to give up output and tune lower or go sealed.

[zora 0]

The Dayton has an 18hz HPF, doesn't it? You could make a box with a cut-off around there, and the amp should be fine. I do agree with the other comments about needing at least two of these drivers for a HT.

JP