i got a box that measures
38 " wide
21 " depth
18 " height
i m not shure what to port it to ? i m using 8 subs infinity 1220 300 RMS each 12 " i was thinking two ports on the top see pic ?
38 " wide
21 " depth
18 " height
i m not shure what to port it to ? i m using 8 subs infinity 1220 300 RMS each 12 " i was thinking two ports on the top see pic ?
You'll get more responses if you don't link to a zip file. I, for one, can't be bothered unzipping.
You're putting 8 12" woofers in a box that size? I don't think so. Ported or sealed, it's going to sound awful!
You're putting 8 12" woofers in a box that size? I don't think so. Ported or sealed, it's going to sound awful!
You save it as a .jpg and make sure it comfortably fits the screen. If the file size is greater than 75K, it's too big.
What about my question?
What about my question?
You are going to a SPL competition?
If yes, port the box around 40-50 Hz or so.
You will need T/S parameters to do this properly.
If yes, port the box around 40-50 Hz or so.
You will need T/S parameters to do this properly.
I deeply suspect that with 8 12 inch woofers that it's physically impossible to achieve enough vent cross sectional area to tune a box of this size to any usable frequency.
OMG!!! he took a photo of a printout of a drawing... PLEASE go away now.... 🙂 thankyou.
alright... lol
38 " wide
21 " depth
18 " height
which is:
96.5cm X 53.3cm X 45.7cm
I'm sure youre smart, so we'll assume they're internal dimensions.
so, thats 235 litres.... lets say.... 10 litres for bracing, so 225 litres, meaning 28 litres per woofer... woofer displacement will be around 2 litres, so 26 litres per woofer.... now each woofer would need a 100mm port. (I'm ignoring whateve you came up with) so, to tune a 26 litre box to say, 40Hz (kinda high, but meh) you'd need a 20cm long port.... hmm... I'm sure you could do it... lol what was the point in this box again?? other than to be big? lol
alright... lol
38 " wide
21 " depth
18 " height
which is:
96.5cm X 53.3cm X 45.7cm
I'm sure youre smart, so we'll assume they're internal dimensions.
so, thats 235 litres.... lets say.... 10 litres for bracing, so 225 litres, meaning 28 litres per woofer... woofer displacement will be around 2 litres, so 26 litres per woofer.... now each woofer would need a 100mm port. (I'm ignoring whateve you came up with) so, to tune a 26 litre box to say, 40Hz (kinda high, but meh) you'd need a 20cm long port.... hmm... I'm sure you could do it... lol what was the point in this box again?? other than to be big? lol
SkinnyBoy said:
What would be worse is if it was a real photo which he then scanned and saved as a .jpg. 😀
Why does it have to be ported? If I had that much membrane area I would go for a closed sub equalized to output low frequencies easily.
Lars
Lars
I don't actually believe any of this is going to happen... like me.. 😀 I design all these boxes, and ask all these questions, and do nothing.. lol 
i ll start makeing the box soon i have all the wood cut all i need to do is put it together ... but i m building lilliput projector so have no time right now for it ....
but are those internal or external dimensions?? and I hope you have atleast 18mm mdf, with a shelf brace in the two gaps between the 3 woofers on the front/back.... may require some creativity to get it to clear the magnets on the top woofers though....
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