Sub Box

[GaseJo]

Hi all,

A quick question. I am building a sub box for my RX7 boot space is not a problem for me. So what i need to know is, Is a bigger sub box better or is there a certain (BEST) size for the sub. I will be installing 2 8" subs in this box. Any information would be helpfull. Also would the box need to be ported?

Cheers Garith.

[trotter]

hey GJ mate, it depends on whether your subs are \'free-air\' or do need a box.

if they are free-air you can stick them on a parcel shelf and let them use the whole boot as a box. Most subs though do require a certain volume of box. Hopefully you have some instructions with the subs as this will tell you all the critical numbers u need!
HTH

[GaseJo]

Hi trotter,

Thanks for the info, There are no destructions with the sub but i am almost certain they need a box. I will search the net and try and find instructions for these VIBE subwoofers to find out what the volume of the box will be.

Cheers Garith.

[trotter]

no probs mate...

try: http://www.vibeaudio.co.uk/index.asp?page=techsupport-downloads.html&header=techsupport-h.html for your info.

i think i may have a program somewhere that helps you design your own box if you fancy giving it a go? let me know if you need it and ill try to find it!

[probedb]

Whatever sub you get should give you the specs required. I.e. what volume it needs or whether it\'s open or not.

For what it\'s worth I\'m going to attempt to build a box around the spare wheel well

[McCARTHY]

8inch subs on the whole work best in just under 1cu/ft something like .8 or similar, and sealed. don\'t go big unless you want to be ovewhelmed with bass. Depends how you like your music i suppose.

if you have 2 of them bulid one box but with a wall in the middle of the 2 subs, however in this wall put in a 3" hole but don\'t port them externally. With external ports on subs they case spikes in the bass line this can damage smaller subs. Sealed is they way forward in my opinion with 2 8\'s nice shape punchy bass.

hope this helps

[GaseJo]

Thanks again trotter.

Think i found what i need from the site. YES that would be great if you could find the program so i can design a box. I have a rough idea of what i want but it would be nice to see if it will actually work.

Cheers Garith.

P.S. I have started to fit VIBE components to the fron doors (not having rear speakers) At the moment i have connected the head unit output to the Xover and out of the Xover i have connected to the original speaker wire in the original speaker loom. Would it be better to go from Xover directly to Speaker? or is the speaker loom good enough?.

[GaseJo]

Hi McCarthy,

Great information I would not have thought about a dividing wall in the box. So is that 1 cu/ft per sub or for both? I like bass But i like crystal clarity better so i think your idea producing sharp punchy bass is excatly what i need.

Cheers Garith.

[GaseJo]

Hi Probedb,

I am looking at having my box between suspension housings and under rear stut brace facing back of drivers seat as i have no rear seat just bins i will take the pull down flap out so the subs are visable. Doing it this way i should still be able to get to spare wheel if i need to without removing sub box.

[McCARTHY]

yes but one thing, make sure that if your messurements allow .8 cu/ft inside. for example 12x12x12 = 1728cubic inches or 1 cubic foot, but that is an outside messuremant not allowing for the depths of the wood. in reality that 1 cubic foot box is 10.5x10.5x10.5 = 1157.6 cubic inches if your were to messure inside the box allowing for the depth of the wood.

does that make sense

[trotter]

if you want clarity then def go for a sealed box, as for speaker question, someone with a rex will know better than me but if the wires look decent enough then keep them, but going direct from x-over to speaker gives less chance for the sound signal to get distorted IMO.

i found that program, you want to give me your e-mail address and ill mail it to ya?

[GaseJo]

Hi trotter,

My E-mail is garithjohnson@hotmail.com  Once again thanks

Cheers Garith.

[McCARTHY]

they ant great its worth running better copper cables for speakers.

[GaseJo]

Hi McCarthy,

Yes i see (I think) So if the measurment for my subs is .8 cu/ft that is the inside measurment of the box which will be 9.6x9.6x9.6 = 884.7 cubic inch\'s
is this right?

Cheers Garith.

P.S I think you are right i will run from Xover to speakers with the Flat 16 cable supplied.

[trotter]

thats it sent mate, hotmail doesnt seem to lkike it 4 some reason, so any probs either give me another e-mail addy if you have one, or give me a shout on MSN - graemetrotter@hotmail.com and we\'ll do it that way!