dissapointed/confused

[Chipmunk2k3 10+ year member]

If this is stupid please excuse me but could it be that the sub is new and still stiff? I've always been told to properly break in my subs

 

[pro-rabbit 5,000+ posts]

If this is stupid please excuse me but could it be that the sub is new and still stiff? I've always been told to properly break in my subs

In some cases the can be an issue, but not the extent that it is played out though. In this case, the enclosure tuning is to high for what the listener would like to hear.

 

[THATpurpleKUSH 5,000+ posts]

I didnt get the tuning that high with my calculations, I guessed on the last part of the port by eyeball method from the build log thread:

 

[Mookie 10+ year member]

I didnt get the tuning that high with my calculations, I guessed on the last part of the port by eyeball method from the build log thread:

Been told that re box calc is off.

 

[pro-rabbit 5,000+ posts]

I didnt get the tuning that high with my calculations, I guessed on the last part of the port by eyeball method from the build log thread:

H-14 - 12.5

D-16 - 14.5

W-24 - 22.5

2.685ft3

port is 2 x 12.5 18.5 long(roughly)

2.75 x 12.5 x 18.5=635.9375/1728=0.368

sub displacement of .16(roughly)

total displacement of 0.528(not including 45s)

leaving a 2.175ft3 of air space

comes to right about 37ish with out taking into consideration the 45s and all other assumptions of course.

I think the formula they use to find the adjusted/corrected port length is off

 

[dbeez 5,000+ posts]

Bingo rabbit I am on my phone so I wasn't gonna type all that.

 

[CHEMMINS 10+ year member]

The RE calculator does not take sub displacement into consideration.

 

[Liquid Bass 10+ year member]

You need way more port area for lows. Get at least 50 inches of port area

 

[09civic 5,000+ posts]

well, looks like im stuck with this box. who would want a box that is tuned so high //content.invisioncic.com/y282845/emoticons/crap.gif.7f4dd41e3e9b23fbd170a1ee6f65cecc.gif

will be awhile till i get a new box

 

[dbeez 5,000+ posts]

Box appears to be built well though.

 

[pro-rabbit 5,000+ posts]

Box appears to be built well though.

I agree, with the except of one of the corners but I'm sure its all good. Rounded most of port edges too.

95saturn just text me saying the builder of the enclosure refuses to believe the enclosure is not correct.

 

[dbeez 5,000+ posts]

Maybe be uses re calculator as well but its been proven many times its not right have Saturn send him the math. And show him a real calculator.

 

[09civic 5,000+ posts]

he does refuse. he thinks that it is tuned under 34 hz.

 

[audioholic 5,000+ posts]

95saturn just text me saying the builder of the enclosure refuses to believe the enclosure is not correct.

lulz.

 

[Electrodynamic 10+ year member]

well here are the deminisons: 24W x 14H x 18D and a 2" L port tuned at 32.5 hz

ok. i stuck a tape mesure down but their is a 45 there so the depth before the 45 is 15.5 and after the 45 is 17. the length of the port is 12.5 and 2" long

Ok, upon further inspection of the build log here the port is only around 16-19" long at most.
This means there is around 2ft3 and tunes around 38hz or higher. This is just a rough idea as there is no way to know with out the exact port length.

Since those dimensions are external and we are assuming 0.75" material thickness used throughout, the total internal size of the enclosure before the port is taken into consideration is 22.5Wx12.5Hx16.5D which gives you 2.68 ft^3 before port displacement. The port itself is 2" by 12.5" by 32.5" long by your measurements, which takes up 0.47 ft^3. The internal port wall takes up 0.12 ft^3 and the 45's are probably another 0.2 ft^3 which leaves you with right at 1.8 ft^3 tuned to 31 Hz. It's a small box tuned low that possesses an F3 of 25 Hz outside of your car...let alone when you throw in cabin gain. If that is the case your enclosure is the right size and is also tuned correctly...and it's actually tuned lower than the enclosures we have here at the shop. You should have zero problems with LFE. That's tuned lower than the 15" I have in my daily driver.

...unless I totally missed something.

However, if the port length really is 18" to 19" long then it is tuned around 39 Hz.