socialstealth

Can you tell me how to get the port area and how to plug it into this forumula (Lv = [(14630000 x R^2) / (Fb^2 x Vb)] - 1.463 x R) using this as an example http://img62.imageshack.us/img62/5149/175cubes32hz26sqin2rg.png

here is a pic of my trunk: I have a 12'' DC lvl 4 sub. I drive a sedan. I like to listen to a lot of pop rock // pop punk // metal music, some have fast bass drums//guitars I think I'm going to go with some type of ported box, which should I go with? a slotted, vented, ported, or what? Can anyone help me design a box for my subs? I also don't know which way to port it, towards the trunk? I'd like to have the box toward the side of the trunk, so I can still fold down the back seat and access the trunk.

I need to cross my tweets around 4k hz, mid range around 500-4000 and midbass around 50-1500 Not exactly sure on the crossover points yet, but its a rough idea of what i'd start with before I get into fine tuning it. I'm either going to use sundown SAX 100.4 for the tweets and mid range and SAX 125.2 for the midbass drivers WITHOUT AN EXTERNAL PROCESSOR, or buy cheaper amps without the crossover features and get an external processing unit with crossovers on it. Which do you guys think is a better option? any suggestions on cheaper, quality amps that lack the crossover features (maybe I'll go for 3 sax 50.4's and bridge each of them ) Any suggestions on a budget processor with good crossovers that I can go active with? Cheaper is better, and I'm ok with buying used. the sax100 & sax125 will cost me about $450, so amps + processor should be less than that. Are there headunits available that have crossover capabilities that will allow me to go active without an external processing unit?

if i get a pioneer prs 880 with a TA mic, will this solve my problem of a 3 way system having different sources? would the fact that i will need 8 channels, and the hu only has 6, so i will have to have 1 channel running out of another amp cause a problem with the TA?

The height of what X the width of what? How do I figure out the port area? is the the height X the width of the entire box? I found this formula: Lv = [(14630000 x R^2) / (Fb^2 x Vb)] - 1.463 x R it says R (radius of port) = sq rt area / Pi I assume it means the port area...which if I can figure out how to find that, I'll be golden Is it bad if the port height is smaller than the rest of the box's height?

I want the vibrations to rattle my chest, does that mean I want it to be tuned low? I figure lower frequencies cause more vibrations, right? Is the lvl 4 DC sub capable of being tuned to 30 hz? or would it damage it? If I can I'd like to have some slight angles in my box, is there a formula for figuring out the tuning frequency for a slotted port? is it relative to length? to cubic feet inside the port?

What goals are there for your system? Do you want a daily ground pounder or do you want an all out SPL system? Give us more infor to help you out, you know the rules. Sorry I thought I mentioned it earlier, its for a daily driver. I don't do any competitions at all. I simply want to feel the bass inside me If I tune it @ 35 hz, does that mean anything BELOW 35 hz will sound like crap? I've heard 32-33 hz is best for a lvl 4 dc sub. I want to design my own box really.... how do I know how big to make the port? (i want a double kerfed slotted port)

the DC suggestions are: ported: 1.5 ft3 SPL ported: 2.0 ft3 Whats the difference between ported and SPL ported? Will the 1.5 ported sound 'better' ? I'm guessing the 2.0 "SPL ported" throws all SQ out the window? what frequency do you think I should tune the box to? going to be run on an SAE1200 @ 1 ohm i listen to punk pop rock sedan

Is the SAE1200 'roughly' as efficient as the SAZ1500 ? Assuming both are @ their rated RMS @ 1 ohm (both are the newest model amps) I plan to run a dc lvl 4 12'' in a ported box @ 1 ohm on my SAE1200. I'll run it for several hours a day as its my daily driver... Do you think I will need a fan to elongate my amp's life? I plan to have my amps inside a false floor, so circulation may be needed. Will having the fan on ALL the time (whenever the car is on) damage the amp? I've heard that amps are made to run at a certain temperature and a fan that runs even when the amp is cold can damage it? My main concern is with the above quote, obviously you think adding a fan will cause noise. If I do put a fan, where do you think it should go to cause the least amount of noise? Is there a part of the amp that should be 'farthest' from the fan? Sort of like RCA's are supposed to be as far as possible from power wires.

Hmmm..... maybe I will go 2 way... is this a good woofer for a 2 way: http://www.madisound.com/catalog/product_info.php?products_id=1600 SEAS Prestige CA22RNX (H1288) 8" Coated Paper Cone It plays 30-3000 hz I can get a pair of them for about $120 used. Are they a good option? Any better woofers for under $120? What tweeter would be a good match for these? I'll probably go with an SAX 100.4d

For the end result, I'd like to be able to listen to the setup for long periods of time at full volume, as I like loud music. Its for my daily driver, I don't do competitions or anything of that nature. 3 way simply because people have suggested a 3 way over a 2 way. I also like a lot of punk pop rock music, which is midbass heavy, so I figured a dedicated midbass driver would be the way to go. I have a DC lvl 4 12'' that I'll be putting in my trunk, I'm not sure what I should tune the box to though.... as for mounting locations, I'll be making custom door pods for the midbass/midrange, and I'm completely unsure about where to put the tweeters or what tweeters im going to get. as far as money goes, I'd like to know which option is better for the money: an SAX amp setup, using the SAX amp's crossovers. Or buying amps without crossovers and using an external processing unit for crossovers. which one would be cheaper, and which one would be better?

I do not have an SAX, I haven't bought any amps yet. I'm deciding if its worth it to buy an SAX. Because if I need to buy an external processor, then there is no point in paying extra money for an amp with crossovers as amazing as the SAX's have. If its better to get a processing unit for my application, then I'd like to know what the best 'budget' headunit/amps/processor would be. Yes I will be using 8 channels, an active 3 way front stage as well as a sub in the trunk. So one set of RCA's will need to be run out of one of the amp's preamp outs. Adrian says this will cause time delay....so I guess this means I need a headunit with a time alignment feature?

Yes, but an SAX 50.4 cannot create a bandbass crossover when bridged. And I'm open to other amp suggestions if I can save money by getting amps without crossover features along with a sound processing unit with crossovers or headunit capable of crossovers.

Thanks ya know, i've been thinking, if you made an internal fan system inside the amp casing, you could either maintain the same reliability with lesser heat sinks, and smaller cases, or just improve the design all together. I imagine the cost of plastic fans to be rather cheap, compared to the potential it has to regulate heat. what do you think of this?

will the 125.2 be able to cut off frequencies under 40 hz and above 3000 hz?

is the perfect shape for an enclosure a sphere? Would rounded internal edges be better than 45 degree angles? Just curious

which would you recommend for the midbass woofer mentioned above, a sax50.4 bridged, or an sax125.2, or sax100.2 ?

i think it was ///m5 he said having an active 3 way setup with 2 sources of crossovers (a sax400.4 and sax125.2) might cause one set of speakers to play ahead of another and cause some type of distortion//echo. do you run a 3 way active setup? Which amp do you think is more efficient, a sax 125x2, 100x2, or 50x4 bridged to 2 channels?

to make a kerfed slot, cant you just cut the shape out several times, stack them, and glue the peices together? this would be stronger and thicker than just cutting slots in the wood, right? how do you calculate a kerfed slot port tuning frequency?

Jacob, I want to run these speakers in a 3 way active setup: http://www.madisound.com/catalog/product_info.php?products_id=1600 http://www.madisound.com/catalog/product_info.php?products_id=8441 (and idk what tweeters, any suggestions?) Will a SAX100.4 be able to supply enough power for the mid range (they're 8 ohm)? I think I may use an sax 125.2 to run the midbass woofers, do you know the ratings of the SAX 125.2 @ 8 ohms? Some people have said that I will run into problems going active with these amps, do you think these amps will work? Any suggestions will be greatly appreciated

what are double baffles, kerfed ports, etc ? what would you suggest I do with the box? Take a look at Custom Fabricators (Pound That Sound, Audible Customs and Fisher Customs). They custom build enclosures and you can see the great work they do and also what a double baffle and Kerf Port look like. I looked through some of the fabricator's sections and did some google research, but I still have a question... I've read that 'parallel sides' can cause 'standing waves'. Does this mean the sides should be angled? or would 45 degree corners solve this issue? If not, What are the 45 degree corners for? Any idea where I can find a formula for slotted kerfed tuning?

what are double baffles, kerfed ports, etc ? what would you suggest I do with the box?

Slotted just means a slot (square) vent using 1 wall of your box. Ported is either a round or slot port. Whats the difference between them? does one have any advantage over the other?

I'm going to go ahead and have my SAE 1200 run a DC lvl 4 12'' sub. I haven't decided on a front stage yet, I'm looking to run an active 3-way midbass//mid range//tweeters I think I'm going to go with the SAX 100.4d BUT I need another amp! Should I use the SAX 100.4 for the mid range and tweets? or the tweets and midbass? or the midbass and midrange ????? And what other amp should I use? SAX 50.4 bridged? or ... ? suggestions and explanations why please

I'm interested in this question as well, Will a sealed box allow notes under 30 hz? The lower the frequency the more vibrations you feel, right?