Sealed subs?
- Thread starter yacob.naif
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i dont know about the new strokers but if it's the old school one dont seal it up
supraman1379
10+ year member
Lifted 03 HEMI
It depends on the box. There are alot ported box out there that can make a sub reach full excursion. It depends on how big it is tho. If its a smaller ported box, its going to take more power to make it move.
It also depends on the size of a sealed box. less volume = needs more power to reach full excursion. More volume = less power to reach full excursion.
Since your playing with a stroker, you obviously want SPL. So definately put that thing in a ported box. With the right power you can do some damage with that things
well, you're riding the right train of thought //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif
near Fb, excursion will be extremely limited in a ported enclosure and BL will dominate output. below Fb, the sub begins to unload quite quickly and excursion shoots through the roof.
in a sealed enclosure, excursion is the cause of virtually all output. in theory, a sealed enclosure could be best for spl. the only issue is that there is no driver with enough excursion to combat the efficiency of a vented enclosure.
a large excursion sub may be better suited for a sealed enclosure to make use of that excursion; at the same time, a ported enclosure that limits excursion can be beneficial as it keeps BL based distortions to a minimum as more of the coil is in the gap.
just like all audio, it's about sacrifices.
near Fb, excursion will be extremely limited in a ported enclosure and BL will dominate output. below Fb, the sub begins to unload quite quickly and excursion shoots through the roof.
in a sealed enclosure, excursion is the cause of virtually all output. in theory, a sealed enclosure could be best for spl. the only issue is that there is no driver with enough excursion to combat the efficiency of a vented enclosure.
a large excursion sub may be better suited for a sealed enclosure to make use of that excursion; at the same time, a ported enclosure that limits excursion can be beneficial as it keeps BL based distortions to a minimum as more of the coil is in the gap.
just like all audio, it's about sacrifices.
I just put my 2 12's in a sealed box(2.42 cube's) and they are realy moveing.I thought sealed boxes made sub move less,I was wrong. I just took them out of a ported box where they didn't move half as much and went twice as loud. Is that right?
Or is my sealed box the wrong size?
Decipha
10+ year member
www.EFI Dyno Tuning.com
if your sub is moving more with your sealed box than it did with your ported box given that you are using the same power source... something is wrong.
either your sealed box is too big (doubtful from what you listed) or perhaps your ported box was tuned too high....generally a sealed box will give your a flatter response, where as a ported box will peak at about tuning -rising above tuning it slightly falls off, below tuning it steeply falls off... thus subsonic filters
so IMO sounds like your ported box was not tuned correctly.. what was the specs of the ported box? what is the source material? have you tried playing with tones?
either your sealed box is too big (doubtful from what you listed) or perhaps your ported box was tuned too high....generally a sealed box will give your a flatter response, where as a ported box will peak at about tuning -rising above tuning it slightly falls off, below tuning it steeply falls off... thus subsonic filters
so IMO sounds like your ported box was not tuned correctly.. what was the specs of the ported box? what is the source material? have you tried playing with tones?
Decipha
10+ year member
www.EFI Dyno Tuning.com
just re-read your post
^^totally disregard my last post
? I don't know how to take that.
The only thing I changed was the box and where it was. The ported box was a prefab,it was 1.5 cube's with a slot port this was for each sub.I don't know where it was tunned but it was low and realy loud,5 min's in the car at a good volume and you felt funny,it would make you like your chest and heart were fluttering,not a good thing but still cool.
helotaxi
5,000+ posts
Kilroy was Here
A ported box tuned for flat response will typically be 3 dB louder right at the box tuning freq compared to a .7 Qtc sealed box. If you setup the ported box to exhibit a response peak you can make it MUCH louder than any sealed box. Excursion really doesn't matter in the ouput of a ported box. The port is producing most of the output around tuning where the excursion is the least and also where the port exerts the most control of the cone movement. That said if you can provide enough power to drive the sub to a high excursion level in a ported box it will be that much louder.
Figure you have to more than double the excursion to equate to the extra efficiency of the ported box. To do that you are going to have to provide much more than twice the power because the motor strength decreases as excursion increases (there are exceptions such as the W7 and the XBL subs, but with those, once motor strength starts to drop off it drops much faster than a conventional sub.) Run that same power to a sub ina ported box and it will still be louder. If loud is what you are looking for, ported is the way to go.
Figure you have to more than double the excursion to equate to the extra efficiency of the ported box. To do that you are going to have to provide much more than twice the power because the motor strength decreases as excursion increases (there are exceptions such as the W7 and the XBL subs, but with those, once motor strength starts to drop off it drops much faster than a conventional sub.) Run that same power to a sub ina ported box and it will still be louder. If loud is what you are looking for, ported is the way to go.
no offence but I really doubt it was low, all the prefab boxes that come from places like bestbuy and cicuitcity are all tuned wayyy up there and not even worth listening to.
the higher the box is tuned the louder it will be but it wont be able to hit those lows and sound clean like a low tuned box and as for the vibrating, peak spl is around like 50hz? somewhere in there, so chances are you were dealing with more of a spl box than a SQ box.....prefabs ftl
killahbean
10+ year member
AzN Sensation
isnt that the whole point? SPL FTW......
you can still get spl out of a box tuned to 32-35hz and have it sound decent, if its only spl then whats the point of using it for a daily driver, I like to hear/feel the low lows.....just throw enough power to it and get a little of both //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif
phantom240
5,000+ posts
ALL YOUR INTERNETZ
Um no. Take a look at it this way. Youre 16, and you admire the people who drive by with boom comin from their car, which yours has none of. Youre new to car audio, and the most youve dealt with is replacing your factory speakers and HU, so you try to learn what you can to see what you need. Where do you turn? Local audio shops, or places like best buy/circuit city... You walk over to the car audio section and start looking at different subs, boxes, and amps. Somebody who works in that depart ment comes up to you and askes if you need help, and you tell him you want boom in your trunk. The salesman looks at you closely and analyzes you. He sees a 16 year old white kid who knows next to nothing about car audio and probably ahs money to burn... so he startes telling you about this sub and taht amp and blah blah blah... and he points out their neon light-clad bandpass box. OOOOOHHHH you can see the magnets... well that box is too expensive for you, so he tells you about their prefabbed ported boxes, which they have quite a variety of... You consider it, and ask about those 60 dollar sealed boxes, and he tells you how they take more power to get loud... blah blah blah.. and you walk out with 2 RF punch 12s and a ported box... and an amp he suckered you into. You get home and its quite loud... but sounds like ***, so you go back there and try to see whats up, when they tell you its just you, or its just breaking in. SO you come to CA.com and we tell you you got owned cuz you wanted loud and didnt know how to get it.
Prefabbed SPL boxes FTMFL.
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