effect box size has on output and sq

[jft32]

Fi recommends using between 5-8 cubic feet for the btl 18. So my question is what effect does box size have on output and sound quality? For example if you have 3 boxes, 5cubic feet, 6.5 cubic feet, and 8 cubic feet, all tuned to 32 Hz and 3000rms going to them what would be the difference in output and sq between the 3

[OBI]

Usually the size doesnt have much affect on the sq. The size range is there more for a power handling aspect. Thats why u see guys who r giving about 2k to the 18 btl put it in around 7 cubes, and guys putting around 4k put them closer to 5 cubes.

[kirill007]

Usually the size doesnt have much affect on the sq. The size range is there more for a power handling aspect. Thats why u see guys who r giving about 2k to the 18 btl put it in around 7 cubes, and guys putting around 4k put them closer to 5 cubes.

Uuhm,no it's half true.

They put it in a smaller box for better power handling.

But box size does has an effect on SQ.

BIgger box means it will play lower, and smaller box will play more of the higher notes.(if they are tuned to the same hertz.)

[OldsBoomer]

for 3k of power i would recommend about 6.2 cubes and it'll play down if you tune it to 32hz just make sure you give it a big enough port to breath.. i'd say 87-91 square inches of port area

[jft32]

Uuhm,no it's half true.

They put it in a smaller box for better power handling.

But box size does has an effect on SQ.

BIgger box means it will play lower, and smaller box will play more of the higher notes.(if they are tuned to the same hertz.)

so if all boxes are tuned to the same herts the bigger of the 3 would peak at a lower fq than the smaller one? if this is true how do you find out what a box will peak at

[kirill007]

so if all boxes are tuned to the same herts the bigger of the 3 would peak at a lower fq than the smaller one? if this is true how do you find out what a box will peak at

No, it wouldn't peak lower, because you have tuned it to the same freqeuncy aka making the peak around the same freqeuncy.

But the freqeuncy response will be different, the bigger box will be louder on lower notes then a small box.

[OBI]

Uuhm,no it's half true.

They put it in a smaller box for better power handling.

But box size does has an effect on SQ.

BIgger box means it will play lower, and smaller box will play more of the higher notes.(if they are tuned to the same hertz.)

Thats not really the sq being effected. What u just described was a change in output of freq ranges, not the clarity and accuracy being affected.

[Ray]

lulz..

it does play a large role.

A larger box will sound muddy, because of the enclosures ability to control the back wave on the cone.

A smaller box will have a flatter BL curve on the woofer which also leads to less imp. swing.. which also helps with freq response.

These and many, many more things are why people pay experts to design enclosures.

[korey_hofer]

yeah box size has everything to do with sq/spl out of a box

so does wall thickness, making the box resonate at different tones

Edited June 23, 2010 by wenn_du_weinst

[OBI]

Damn learned something new today. Guess I need to do more reading.