This was just a rough draught.
With more powerful drivers (higher Bl and better xmax) or 4 isobaric pairs the box size can be reduced substantially.
I just wanted to se what could be done with in a reasonable driver budget and lots of plywood sheets.
The four 12 inch drivers can be arranged PPSL for a healthy reduction of distortion.
LOL!
"No, that won't work. You need a deep box for deep bass" said a head installer because the box I was calculating for 4 Pyle 8" woofers looked too small. Silly me, using math and physics for such a thing.
The "LOL" was for the old memory that statement drudged up.
My physics book told me that 4 mid-1980's 8" Pyle Driver woofers might need a smaller box in the back of a teenager's 1970's VW Squareback than what a red-eyed fool might think right after his extended lunch break. I most likely was shooting for Qtc of 0.707
Point being, there was absolutely no math or physics behind *his* statement, unless counting out money for a bag of weed is considered math.
He once told a customer that he didn't wire woofers in series because the sound came in from the + wire, so it hit the first woofer harder than the second one. That's why parallel is better, it hits them both at the same time.
My physics book told me that 4 mid-1980's 8" Pyle Driver woofers might need a smaller box in the back of a teenager's 1970's VW Squareback than what a red-eyed fool might think right after his extended lunch break. I most likely was shooting for Qtc of 0.707
Point being, there was absolutely no math or physics behind *his* statement, unless counting out money for a bag of weed is considered math.
He once told a customer that he didn't wire woofers in series because the sound came in from the + wire, so it hit the first woofer harder than the second one. That's why parallel is better, it hits them both at the same time.
Half the size with two very large xmax and high Bl drivers. Needs more power though...
GAS Competition 12D1 | GAS | Billjud | Brl.se
If Etocynned could give up a few Hz (speed up the trax a bit 
) and the Audiopipe's specs are right then maybe an 8th order box ??? - he's got 14mm xmax.
60V and coils in series - its awfully big at 460 liter airspace - he might already have better - ?
btw I was told by a guy who worked on my car that thick wires had more "resistance" than thin ...
) and the Audiopipe's specs are right then maybe an 8th order box ??? - he's got 14mm xmax.60V and coils in series - its awfully big at 460 liter airspace - he might already have better - ?
btw I was told by a guy who worked on my car that thick wires had more "resistance" than thin ...
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can one easily discern a difference in pitch between a sine of 14Hz vs 20Hz? does it sound like a half octave drop musically ? - Does subjective pitch of pure tones change with level?
my eyesight's poor/uncorrected - the airspace volume in my sim above was 497 liter. Here's one about 10% less.
It might be good to ask BFM at Audioasylum if he has a drawing for a sub which is tuned to ~15Hz. It misses the 15Hz pretty badly - but looks fairly punchy - if could be made stiff enough.
my eyesight's poor/uncorrected - the airspace volume in my sim above was 497 liter. Here's one about 10% less.
It might be good to ask BFM at Audioasylum if he has a drawing for a sub which is tuned to ~15Hz. It misses the 15Hz pretty badly - but looks fairly punchy - if could be made stiff enough.
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