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Thread: Box Size Dimension ? Lanzar not helping me !!

  1. #11
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    X-treme, if this is your first subbox enclosure forget going for an isobaric as suggested..... stick with a sealed enclosure, since it will be smaller in size and less forgiving to dimensions.... screw up a ported/isobaric/bandpass enclosure and not only will it sound crappy but you may damage your subs due to incorrect air pressure around the subs.....
    I'm a little offended. I think my post was valid considering his original problem. I did mention the downsides to using the isobaric enclosure. Construction is important in most speaker enclosures anyway. With a sealed enclosure it is more important that the box is air tight than in many other types. So all methods really have their pitfalls. I have constructed an isobaric enclosure for two small 6" subs(not for a car by the way) and it really doesn't have to be that difficult. You just need to be careful with your measurements and use plenty of glue(that's why cabinet makers don't build good speakers).

  2. #12
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    Dude get a car first install a system then come and make comments about it!
    I just cant stand when people talk about something they have no idea about!
    I agree fully, im getting sick of his **** and "I need to throw in my opinion" attitude....., he is givin guys like you and me in Oz a bad name!
    And here was I, Thinking I was being helpful, I don't get it?? I be stupid, and get flamed, I give good advice and information, and get flamed?? what am I supposed to do??

    X-treme, if this is your first subbox enclosure forget going for an isobaric as suggested..... stick with a sealed enclosure, since it will be smaller in size and less forgiving to dimensions.... screw up a ported/isobaric/bandpass enclosure and not only will it sound crappy but you may damage your subs due to incorrect air pressure around the subs.....
    well, you could sell the subs you have, then buy the ones sold by jaycar, and make up your own box using the dimensions shown in the article.. But without the built in amp module..

    [ 09-20-2001: Message edited by: SkinnyBoy ]

  3. #13
    FLAC
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    Originally posted by Technics:
    <STRONG>

    I'm a little offended. I think my post was valid considering his original problem. I did mention the downsides to using the isobaric enclosure.</STRONG>
    didnt mean to offend Technics..... sorry if I did, but for the first time builder an isobaric is a hard project to get right... and with the high cost you pay for a good quailty sub-woofer you wold hate to get it wrong.

    your right about the space advantage.... oh welp, maybe I should bite my tounge next time......



    btw, how do the 6inch subs perform? I once had a car audio mag with a BMW Z3 with 12 (twelve!) 6inch subs in the boot.... and the enclosure size wasn't too big, but delivered really low clean bass......


    btw * 2 - oh X-treme, um I got your prv msg.... cant really suggest much else.... blaubox has given me nice figures for both of my enclosures.... if you want to be really sure, you need to get the reccomended specs from the sub woofer maker i guess...

    [ 09-20-2001: Message edited by: magnetik ]
    Project - GAME OVER :(

  4. #14
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    The ones I used were Jaycar CW2135 Polycone woofers. They are 8 ohm but there is an allmost identical 4 ohm version if you wanted to use them in a car. They are 80W/RMS a piece which is pretty good for the price. They aren't very efficent but with 160 Watts through a pair it's not such a problem(besides I'm a purist and prefer quality to SPL. My current "class A car amp with its own radiator" project is almost done as well hehehe). I've been building a very compact set of speakers to go with my DVD setup at home because I move all the time and I really need to get rid of my current system. I don't know if I can borrow a forklift to move it this time . That's the .1 of the 5.1 speaker setup taken care of. now all I need is some good drivers to use for the compact satellites.

  5. #15
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    How much are you guys paying for your subs??
    I paid $39 Australian for the sub and about $20 for the wood for the case, its pretty cheap, and not that good, BUT I DON"T CARE!!!
    How do I measure how good the speaker/case are?? like how low it can go??

  6. #16
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    Originally posted by Technics:
    <STRONG>(hacked your quote BTW!) the ones I used were Jaycar CW2135 Polycone woofers. They are 8 ohm but there is an allmost identical 4 ohm version if you wanted to use them in a car.

    I've been building a very compact set of speakers to go with my DVD setup at home because I move all the time and I really need to get rid of my current system.</STRONG>
    jaycar have a nice set of drivers in their range........ their 10 and 12 inch subs pack quite a punch too..... im still a JL Audio man myself..... I love their stuff!!


    im keen to build a nice 5.1 set of speakers too..... recently purchased a DVD player and im amazed at the quality of the picture and sound...... would love to get a 60cm + tv set and build up a set of 5.1 speakers... oh well, oneday maybe! im renting at the moment and I cant be stuffed setting up 5.1 speakers at the moment...
    Project - GAME OVER :(

  7. #17
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    Just to through in few comments regarding this issue.
    Isobaric is fine for low power small size speakers 6 - 10in. It basically makes two speakers work as one. So basically you can make your small 8in speakers sound like a 10in or so but anyway its not gona be as good as having 10 or 12in in a sealed box.
    When it comes to High power and bigger size speakers say 12in or 15in isobaric box not only will be hard to make and tune but also would be dangers to use. The pressure is so great produced by those speakers that even slight out of phase signal will damage your speakers.
    I personally recommend to use a sealed box for 12in - 18in speakers and tuned to around 40 - 50Hz response depending on the size of the cabin in your car.
    Positioning on the speakers also play a big role when it comes to car systems.
    For hatchbacks its always better to position your speaker facing the back of the car. having the speakers on an angle 25-30Deg (depending on the angle of your back window) also will decrease the level of distortion and make the transmition of the bass more clearly through out the car. Another important factor is to leave some space between the speaker and the panel its facing. This will reduce the risk of damaging the speaker also reduce the pressure that builds up in front of the speakers.
    For the cars with a boot its the best facing the speakers forward but away from the firewall between the back seat and the boot.
    One other import factor that people leave out is a separator panel between the speakers. If you making a classical Speaker box for the car then don’t forget to put a separator between two speakers. This will keep the pressure separate and will help to produce cleaner bass.
    AS for the best Sub... Go with Infinities! nothing beats those. 18Hz Res. You gona need a big box for that!
    And as for an Amp to drive them Nothing comes close to Fosgate Punch (So called Heater).
    Some stats on the system I built or helped to build. Most of them been in the competitions.
    Car: EXA 2 12in Infinities 142Dbs
    Car: Starlet 2 15in Clarions +145Dbs
    Car: Charade 3 15in Fosgates with 2.50 (yes two by 50 watts)Punch amp 151Dbs
    Car: A wan 18 12in with 2.500 Punch +151Dbs
    My old car: Laser 2 12in (Unknown brand 8ohm) with 2x35Watts Alpine amp 135Dbs

    SkinnyBoy now thats loud!
    Fosgate

    System Comp V3 - In progress.
    Low power MB with C7 CPU, DC-DC PSU, car ECU link, USB TV, GPS, 7" TFT, Wireless, Voice.

  8. #18
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    AS for the best Sub... Go with Infinities! nothing beats those.
    How much are they for a 12inch and what size is the magnet, (in kilograms please), and other specs please.. I rekon I know of a better sub than those..

    [ 09-21-2001: Message edited by: SkinnyBoy ]

  9. #19
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    Originally posted by SkinnyBoy:
    <STRONG>
    How much are they for a 12inch and what size is the magnet, (in kilograms please), and other specs please.. I rekon I know of a better sub than those..

    [ 09-21-2001: Message edited by: SkinnyBoy ]</STRONG>
    you are such a little moron, trying to measure sub quality by the size of the magnet !
    if you dont have a qlue of what you are talking about: SHUT UP and read, and try to learn something but stop your useless crap.

    you are really starting to **** people off.

    back to subject, a choise of subs is in the eye of the beholder.
    you want clean bass or stamping loud db's ?
    for myself i really liked my rockford fosgate 10" punch power dvc
    the box that rox !
    time for the sig:

    '00 VW golf TDI upped to 130 HP - 18" RS 6 wheels - liliput 7" tft in indash housing - epia 10K - SB audigy - caliber 1 fahrad CAP - RF punch amp - hollywood 1.6K mono amp - boston acoustics pro - RF 10" DVD sub

  10. #20
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    HEY!!!!! I know what I am taling about.. Okay, I'll ask again.. What are the specs of the 12inch and how much??

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