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ncc74656

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Everything posted by ncc74656

  1. ncc74656

    SP4 box for back seat. am i designing this right?

    I've tried to use ISD to show me how it's going to react but the program refuses to accept the specifications of the sp4 or the BL so either the program is broken or Fi audio lies about there subs specs. Either way it's useless to me.
  2. ncc74656

    SP4 box for back seat. am i designing this right?

    And we think that 151 square inches is enough? Could you tell me how exactly to calculate what I should have for port area? it seems that maybe the website I was looking at to give me a hundred sixty seven was incorrect.
  3. ncc74656

    SP4 box for back seat. am i designing this right?

    given what i think i know right now here is a new build: what did i not get right? http://imgur.com/a/o5MYm
  4. ncc74656

    SP4 box for back seat. am i designing this right?

    what is the proper formula then for the determination of port area. im not sure what 70% BL means.
  5. ncc74656

    SP4 box for back seat. am i designing this right?

    my old BL box had 2 24" long 8" round ports and my builder said they work better and he preferred them over a slot port. im leaning towards a slot port as they seem to take up less space and are easier to build. now knowing about minimum port area it seems that my old box did not have the recommended amount of port? im basing this off of this website: http://www.carstereo.com/help/Articles.cfm?id=31 it seems to take Xmax and compute the port area, should i consider this to be accurate?
  6. ncc74656

    SP4 box for back seat. am i designing this right?

    from what i just found on-line i need 167 cubic inches of port... at that size i am having a very hard time tuning anything below 40hz... does that port area sound correct? i would like to make this box some what rectangular so i can turn it and face it up, back, or forward to play around with acoustics.
  7. ncc74656

    SP4 box for back seat. am i designing this right?

    But no matter what, this isn't going to happen. It just isn't. It's the equivalent of saying "I want a car as fast as a Ferrari that I can also use as a moving van that triples as a vehicle to tow my motor home with." i understand there are trade off but why then can i have a home stereo that is also ported that can hit the lows and the highs equally well? perhaps im not explaining what i am after well enough or perhaps home audio and car audio are different? i would think tho that a ported enclosure is the same whether its a 15" 750W home sub on my computer or a 3000W 18" Fi sub in my truck no?
  8. ncc74656

    SP4 box for back seat. am i designing this right?

    does it matter how large the box is? i originally wanted 8, then i was told stay around 7. how do i know whats best for me, if the sub requires less power in a larger box then does that mean it also makes less noise? should i stay around 7 or go up to 8?
  9. ncc74656

    SP4 box for back seat. am i designing this right?

    im going to let my phone charge a bit and then ill give you a call. i was told for port area that i just need a large enough one to prevent port noise but aside from that it only matters in the realm of tuning.
  10. ncc74656

    SP4 box for back seat. am i designing this right?

    going over some numbers, if i do .75 the box will be much smaller. it was suggested that i would want to stay around 7 cubic feet, my old box was 5.5 cubic feet and tuned at 44hz. this is the box that i had built for me. i was thinking for my new box to tune around 35 or 36hz and make 8 cubic feet. my thought behind this was that a larger box would aid in the low notes and a higher tune would help keep the higher frequencies. i have had some input however that tells me i am incorrect about this assumption and i should tune at around 32-33hz and a larger box would only reduce the amount of power the sub can hold. wich direction should i go? does anyone happen to have skype or some kind of voip? id love to have an actual conversation about what exactly im trying to do here and where im going wrong. thanks.
  11. ncc74656

    SP4 box for back seat. am i designing this right?

    ok, so i will run a single 3/4" MDF on the box. what should i do for bracing? connect the front/back side/side top/bottom? or just a couple of those? i did order a dual 1 to explain my 3rd paragraph: i own a vidsonix 15" sub that ive had for 10 years. its hooked to my computer and i love the clean, rolling, phasing bass it can produce. songs from poker face to kaskade eyes, to disturbed and godsmack sound good. the sub i had (Fi BL 18) totally blew away anything i had ever heard in the higher frequency ranges of bass, such as what kaskade puts into most of his songs. the lows however were another story, lady gagas song just dance had no bass in it. the low bass was kind of felt but you could not hear it, my 15" had more power than my BL. Love game by lady gaga however sounded bloody amazing as it was all high frequency bass. i want to be able to have amazing bumping like on disturbed, god smack, just dance; while at the same time not loose that crazy high end power that i had. I have owned Kicker L7's and those were able to pound the low end bass but were just like the BL but reversed where they were hollow on the higher songs such as kaskade eyes and love game. I feel like i traded low end for high end and as most of my songs are high end i was ok with that but then the BL just ended up not being loud enough even on the high end. i started it off on a ZX1500.1 and then put a 2500.1 behind it and it got quite a bit louder but still not enough. this is why i sold it and ordered a SP4, with my 10" and 8" door speakers and tweets and super tweets the sub just got drowned out. what im looking for is a box that will give me every last bit out of the SP4 that is possible, i want to be able to hit every conceivable frequency that this sub is built for and i want to do it while being so loud you need to time your next breath with the bass... I prefer to build this box myself but i am looking for quite a bit of help on design.
  12. ncc74656

    SP4 box for back seat. am i designing this right?

    thank you, the last BL that i bought i paid a guy (who came very highly recommended i might add) a lot of money to build a box and i feel like i did not get what i wanted out of the sub. this time round i really want to get a firm grasp on all the concepts of box building and do it myself so i know what im getting. to his defense he did say he had never built a box for an 18 before and after delivering mine he said he never would again.
  13. ncc74656

    fi bl to sp4? and amps?

    i cant find a pre-build for a SP4. i finished my final design cut outs last night and i think its all good. i do have one final question however. my port bends and at the bottom of my port are 2 vertical braces. does this effect the port? if so what needs to be changed? here is a picture:
  14. ncc74656

    fi bl to sp4? and amps?

    well i think i have tuned it all right but i just want someone who knows more than me to verify it so im positive before i start gluing stuff... maybe ill just extend the length by .5" to take the box up to 7.89 cubed and then the port area will be at like 15.8" squared.
  15. ncc74656

    fi bl to sp4? and amps?

    its 4ga, its silver wire and came with my kicker amp. i do not know what purity it is but i know that silver has a hair lower resistance than copper does. on a side note... your damn banner ///M5!! i cant even figure out what im going to type, totally derails my train of thought >.< if i upgrade my sub i wont be using that wire anyway because ill be going up to 0ga through out the amp setup and i suppose maybe 4 into the sub. idk how large the terminals are on a SP4. the main concern i have is if my box that i intend to build is setup right. in some of the fi videos they talk about a certain port area that is optimal and i cant find that info on the SP4's. i have mine setup with a 16.29 squared port area right now. my thought was that adding some poly fill will make the sub think its in a slightly larger box and off set that port area, or does it not work that way?
  16. ncc74656

    fi bl to sp4? and amps?

    i posted a box build question in another forum. if anyone happens to know anything about boxes id appreciate any kind of validation on whether or not im an idiot. thanks.
  17. ncc74656

    SP4/BL 18" box

    sooo, does this box have the proper port area and build? is the sub placement in the middle alright or should it be lower down on the face?
  18. ncc74656

    fi bl to sp4? and amps?

    ok so the amp sees each sub coil as maybe .8-1ohm per coil. i use silver wire so the resistance is a bit lower there. suppose that explains why my kicker has not blown up running at 1.4ohm. because its really running more like 1.7-2.2 ohm depending on various things. i should ohm it all out one day and find out exactly what the amp is seeing... i was thinking of using a BC3500 because i believe the SP4 fully loaded could handle the power. however from what im reading now the SP4 would be closer to .5 ohm anyway and thus would deliver 3200W+ to the sub. i think that sounds like a very good pairing, no? another question in regards to the baffles of the box (and maybe ill make a new thread about box construction), if i have 2 sheets of MDF on the face and 2 holes cut, one for sub basket mounting and the other for the diameter of the sub so its recessed past the outside baffle. does that still count as a double baffle? or should both holes be even so the sub screws through both sheets? finally does anyone have a good link for info on how to o-scope gains/bass boost levels on the deck/amps.
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