ported sub box dimensions
 

hey i just got a power acoustik BL 15

the specs are here

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">700 watts power handling
350 Watts RMS
85 oz. magnet
2” kapton voice coil
SPL 93 dB
FS: 22Hz
Vas: 6.05 cu.ft.
Qms: 5.8
Qes: 0.49
Qts: 0.4536
Xmax: 0.3"
Sealed box: 2 cu.Ft
Ported box; 3.3 cu. Ft.
Tuning: 28Hz
Port size: 3” (dia) x 5.8” (length)
# of ports: 1</TD></TR></TABLE>

i want to build a ported box so my questions are as follow

1. 3" diameter port, is this inside diameter or outside diameter
2. is 3,3 cubic feet perfect or will a bigger box yeild better results if i can fit it, or do i need to be dead on 3,3 cubic feet on the internal volume

3. does 3,3 cubic feet include the space the port takes up and the volume the woofer installed in the box takes up??

4. How could i convert the 3" round port to 4" round port just have the same internal area ?
http://images.zeroforum.com/smile/emthup.gif

Re: ported sub box dimensions (Optiks.)
 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Optiks. &raquo;</TD></TR><TR><TD CLASS="quote">hey i just got a power acoustik BL 15

the specs are here

i want to build a ported box so my questions are as follow

1. 3" diameter port, is this inside diameter or outside diameter
2. is 3,3 cubic feet perfect or will a bigger box yeild better results if i can fit it, or do i need to be dead on 3,3 cubic feet on the internal volume

3. does 3,3 cubic feet include the space the port takes up and the volume the woofer installed in the box takes up??

4. How could i convert the 3" round port to 4" round port just have the same internal area ?
http://images.zeroforum.com/smile/emthup.gif

</TD></TR></TABLE>

1- Inside diameter.
2- I would say dead on, but you will need to know if 3.3 cu ft is net volume, or gross volume, [check with speaker manufacture]
3- See above.
4- You will need a port program, for the same tuning bigger ports need to be longer, [if I remember right]

About tuning, I have found that the best way to tune a ported box, for a car, is, "manually" install everything, including sub box, with a long port installed but not glued in, then with your fave bass tunes, start shorting the port, and NO just pulling it out of the box is not makeing it shorter, you have to cut it to length, makeing it shorter and shorter, [by 1/4" to 1/2" at a time] don't forget the port has to be sealed, [we use "window weld" window putty would work] around the edge each time you test it. I have found that doing it this way has resulted in better sounding sub bass in cars then the recomended port length, and the length has varied by as much as 2" or 3" in some cars with some boxs, [smaller cars biggest diff.]
Don't forget for best sound, [no port noise] the outside of port, [the part you see on the face of the box] should be "flared", [use a 5/8" to 3/4" halfround router bit] and each time you cut the port shorter, [at the back] take off the sharp inside edge, and before you glue in the port, "roll" the inside edge, nice and smooth. https://honda-tech.com/forums/images/smilies/emwink.gif94

Re: ported sub box dimensions (fcm)
 

so basically build a box about 3,3 cubic feet sealed and then grab a tube and go from there? good idea


what do i look for while changing the length of the tube

Re: ported sub box dimensions (Optiks.)
 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Optiks. &raquo;</TD></TR><TR><TD CLASS="quote">so basically build a box about 3,3 cubic feet sealed and then grab a tube and go from there? good idea


what do i look for while changing the length of the tube</TD></TR></TABLE> Sub bass responce, or when you like the sub bass, stop and glue port into place. https://honda-tech.com/forums/images/smilies/emwink.gif 94

Re: ported sub box dimensions (Optiks.)
 

to calculate a wedge type box, simply subtract the lower width section of the box & add it into the upper width section of the box to have a equal width. for example, if your lower section is 12" the upper section must be 8" so if you calculate it subtract 2" on the lower section & put it on the upper section & you will get an equal width of 10", got it? Btw, ist it 15 inch sub?

Re: ported sub box dimensions (KamoteMan)
 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by KamoteMan &raquo;</TD></TR><TR><TD CLASS="quote">to calculate a wedge type box, simply subtract the lower width section of the box & add it into the upper width section of the box to have a equal width. for example, if your lower section is 12" the upper section must be 8" so if you calculate it subtract 2" on the lower section & put it on the upper section & you will get an equal width of 10", got it? Btw, ist it 15 inch sub?</TD></TR></TABLE>What are we talking about? https://honda-tech.com/forums/images...s/emsmilep.gif 94

ya seriously, well i built the box but my sub blew within 5 mins of testing it

too pissed right now to type

Re: (Optiks.)
 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Optiks. &raquo;</TD></TR><TR><TD CLASS="quote">ya seriously, well i built the box but my sub blew within 5 mins of testing it

too pissed right now to type</TD></TR></TABLE> Well that sucks, what amp do you have driving it, and what did the sub bass sound like when you were "testing", did you brake the sub in, or did you see how loud it would get right away. https://honda-tech.com/forums/images...s/emsmileo.gif94

Re: (fcm)
 

i have a phoenix gold 500w rms amp

no i didnt even have it at have volume before it started to smoke and die

Re: (Optiks.)
 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Optiks. &raquo;</TD></TR><TR><TD CLASS="quote">i have a phoenix gold 500w rms amp

no i didnt even have it at have volume before it started to smoke and die </TD></TR></TABLE>I would have the amp checked out before you hook it up to another sub, although it could have been something else, [damaged VC] if you were not over-driving the sub, and it "started to SMOKE and die" and this happened within 5 min., I would say there is a hell of a lot of DC coming out of the amp https://honda-tech.com/forums/images...s/emsmileo.gif 94

Re: (fcm)
 

it was a deffective sub, i hooked up a SVC kicker sub and its working flawlessly

unless it could still be the amp, but wouldent the kicker die too?

the 15" is getting replaced under warranty