ncc74656

2500 dodge ram with factory alt. i have been having major voltage drop issues with my Fi SP4 that i installed so i think its time to upgrade. i run 2 group 31 batteries 975CCA each, how many of these could i run off a single alt? how large of an alternator could i run in my truck and what will it cost? would i need to run more than one for my power demands? about 380A of sound system, a 5KW power inverter and a 450A winch.

ahh, i have only ever heard of it as an octo port. well i got my new alternator yesterday so i can start testing this system with out fear of destroying my amps. ill see where it gets me.

the advantage of octo port was explained to me as being able to change tuning on a whim with out needing to build a new box. ok so mid range is not doing what it is supposed to. i dont know of any mid range bass speaker for the door that is able to vibrate the car apart. i feel that i can hear it just fine but just not feel it. what i really need to do is a frequency sweep so i can for certain say X frequency is where i want it cut and X frequency is where it starts to get quiet adn so on. most of what im going on is so subjective that its very hard to quantify what i want, what i have, and what you are explaining. ive got the wood for a new box that im going to build tomorrow, my understanding is that a sealed box will give me a flatter response curve and thus i would be able to better know what the sub is capable of.

im not convinced that ill know what i want untill i hear it. following that i feel that i need to play with this. maybe i dont have the sub that i need but maybe i will get what i want out of it or maybe ill be selling it and buying two Q's or some other sub. maybe a sealed box with a second SP4 will give me what im looking for. what i really feel i need to do is run a sweep through the hz to see exactly where the bass i want starts and ends so i can get a better idea.

i just need to play around with this. build lots of boxes, try other woofers... i need to hear how things change and see how things work or dont work together.

k

lol, i have so many people tell me that anything over 65hz is crazy but i started out in home audio and i have PA speakers (horn tweets with 12" drivers) and 15" subs for my computer speakers and the sub is crossed at 125hz. the 12" drivers take 60-3500hz so i have always had that high mid range bass... i am cutting my doors apart to build new fiberglass pods. so if i need to add a second set of 10's then so be it but right now my vocals and mid range are able to keep up. i just want the volume level of mid bass from my sub and i do not think that i can obtain that volume level out of any mid range. to be clear my highs and mid range are ok (maybe a little low when the sub is fully maxed but not by much). its the mid-high true bass that i want to increase the volume on. i have my 2500.1 going out tomorrow for repair, when it was stolen they crossed the power wires and fried it so... yea. once i get that back i will start playing with my box again. i think i will make 1 sealed and 1 octo port box. i want to build a series of ports from 32-39 and up through 45hz to see how the sound changes. there is a way to do a bandpass thing where one side of a sub is sealed and the other vented right? i feel like i have seen those, would that give me the ability to have the best of both worlds?

yes, mechman

so i ordered my new alt yesterday and i have a tracking number today... like holy crap im blown away. coming from waiting a month and a half for my sub and im currently going on 3 months for a steering stabilizer, ill be waiting 4 months for my suspension system to be built and delivered (projected). I have been waiting a week for kicker to be able to give me a RA number to send my amps into them for repair and here i have a performance part that will be at my door with in 4 days of ordering it... I am blown away by this.

lol. ok well that answers that. what i get hung up on is my BL sounded exactly how i want the high end to be and my SP4 sounds exactly how i want my low end to be. i would just require the low end to be a bit flatter on response curve and then to combine these two subs some how.

PWX 10" on my eclipse amp. the mids are on wood spacers on the 1/8" gauge sheet metal doors. the truck has 200sq feet of sound deadening in it. i can clearly hear the bass down to about 60hz on the PWX and i can feel the bass in my chest around the 150-200hz range from them but its just not as loud as i want. like i want the 125hz bass to hit and to not be able to breath durring it... to that end what do you think about 2 SP4's on 2 strapped square audio amps? in a sealed box. i have limited room int he back of my truck due to tools and my truck is used for work. the absolute most i think i could fit back there sealed would be 3 18's or 2 in vented.

k. well i will build the box as soon as my new amp arrives (F*** thieves) and ill find out just what this sub can do with out a port. ill shop around for an EQ... i could buy a new deck like a DEH80 OR i could buy a stand alone EQ. what do you think is best?

i have no idea on teh T/S, its not on there website. im running a 1200W eclipse to the two speakers so there getting plenty of power. actually i think i may have blown one of them yesterday... . a guy came by to test his amp so i hooked it to my sub since my amp was stolen a couple weeks ago. i forgot to turn on any xover on the mids as i was using them for bass and i turned up teh volume to push the sub. i think i exceeded Xmax on the right speaker as it sounds blown now. sigh

i feel i need to start this by saying In my world the sub should take 25-150hz and it is that range that i want my subs to take. above that my 10" mids will handle and then tweets. now i know my desire to have a sub xover at 150 is strange and i got those responses in the home audio world and DJ world as well but its just how i like my music. hearing is not enough, i want to feel the sweeps through that range. I have 10" mid range and you can hear them but you cant feel them. my old sub was a BL18 @ 44hz and it allowed me to FEEL the high end bass but obviously with no low end. so now my SP418@34hz allows me to have great low end BUT what drives me crazy is when a song has a low burp that flows into a long sweep up the higher spectrum range. well with the lower tune i only feel the burp and then the volume drops and i can only kind of hear the sweep. ok if im honest you can hear it but you just cant really hear it you know? like the sweep is around 50DB while the burp is 120 with all this flowing bass that shakes everything. so the idea of a SP4 and a BL, one at 32 adn one at 44 was my first idea. my thought was that if i xover and such i could divide the bass loads and get both but it seems an EQ and other such things were left unconsidered. if i go with a sealed i will loose output but how much? i will install my SP4 into a sealed box once i get my amp repaired and see how it sounds. perhaps dual SP4's in sealed?

he has heard my SP4 18 at 34hz and i sold him my old BL 18 at 44hz. he wants a balance between the two so i thought id halve the difference and see where it gets us. some buddies around me have said they prefer 39hz for listening so i figured its worth a try. i know that while i am very happy with my 34hz tune in the low end i am not happy with it as a daily driver. i suggested that he may want to do a sealed box but he defiantly wants a port. with the .2 bracing i wanted to reduce the internal space so i was going to add wood until i got to that amount of displacement. he is putting it on a 1500W amp but the amp puts out far less power than my kicker so from a comparative pov i wanted to raise the cubic footage to allow for a more matched power handling build. im not sure if id want the box to be any further on the outside edge of specs. he wants a large box for this 12. the whole reason he is buying a 12 (wich is teh same price that i sold him my BL with box for) is that is mother wont let him use the 18" as its to big. i made the sale on craigs list and it allowed me to upgrade to an SP4 for rather cheap so it was a win/win for both of us but now he is kinda stuck...

friend wants to buy a BL 12 and place it in his car. he wants it even with teh rear seats so its a bit tall of a box. does this look proper for such a sub? http://imgur.com/a/IUDaJ

i am pushing my boss hard to buy a Fi Q or SSD 10" for is rav 4. ive never used the Q but ive used the BL and SP4 and considering how those subs blow away every other sub ive used in the past in volume and SQ i cant even imagine the quality coming out of a Q. id go with a Q (fully loaded of course).

well i guess ill build a few wood boxes and see what sounds best then use that size box when i build hte fiber glass.

my low end bass is bloody insane! however im someone who prefers the sub xover to be at 150hz as i like the 60-125hz frequencies in my bass. my truck is pretty solid so nothing is breaking but there is quite a bit of flex. in a couple weeks im going to make an octo port box and play with tuning.

hmmm, perhaps ill ditch the hair chair part and just go for quality with volume.

you say cone area is what makes the air flow? not the port? how much more cone area would i need from a 18" sp4? i had assumed it would be kind of a given with such a large sub?

k, thanks. after i build this one and test it i want to make an octo port box and see how that sounds. i made my first ported box ever and i think it turned out good but not quite what i expected. i wanted it to just whip things around the car with air pressure but that is not the case. however i think its due to my port being made for music instead of max air flow?

i think ill go with a 320 and if i need more ill buy a second.

so how do the chargers work? do i hook them between the alt and the batteries?

4sxpower in incorrect. i has listed me a group 27 battery while mine takes 2 group 31's