Announcement

Collapse
No announcement yet.

Box Size Dimension ? Lanzar not helping me !!

Collapse
X
  • Filter
  • Time
  • Show
Clear All
new posts

  • Box Size Dimension ? Lanzar not helping me !!

    hi , ive tried 2 contact lanzar dealers
    quite a few times !
    they are eiter very busy or unable to help me!

    iv got the specs that came with the subs
    2x 12" Lanzar Dc 450W RMS subs

    now i wana build the box ..sealed = x abt of Db (2Cu box)
    vented = x +3 Db (4Cu box)
    but i dont quite have the space to put a 4cu box in ..
    i want 2 b able 2 c outa my rear window

    who has got some insight of what i can try
    also ,is is dangerous to put amps' in a sealed locatiuon ,ie make the instalation look nice
    If its 2 loud ur Old ,;-)

  • #2
    Well, don't be greedy??? Use one sub??? At the low frequencies, you don't really need 2 speakers, (left and right), because, you wouldn't even be able to hear the difference between the two..

    Comment


    • #3
      Originally posted by SkinnyBoy:
      <STRONG>Well, don't be greedy??? Use one sub??? At the low frequencies, you don't really need 2 speakers, (left and right), because, you wouldn't even be able to hear the difference between the two..</STRONG>
      your missing the point. 2 subs will push more air than one sub thus givin a greater "thump". X-treme, maybe try downloading a few of the good sub enclosure programs on the internet and plug in the figures of the subs..... see what volumes you come up with.

      I must admit its a huge problem in the car environment... my twin 10Inch JL's are in a very small enclosure smaller than the optimal volume but still within the the lower/upper volume that JL audio suggest.

      I used BlauBox to work out my sub volumes.... plug in the values, spits out the volume and the approx freq curve... if you cant find it on the net, send me an e-mail and I will forward it on....and
      Project - GAME OVER :(

      Comment


      • #4
        You could also use an isobaric enclosure. I don't have the calculations to work out the enclosure volume but I'm sure they are available on the net. An isobaric enclosure uses the two speakers as one (they are separated by a very small volume of air inside the box so they move as one) and will allow you to have about half the box volume required for a single speaker and still get the same frequency response. The down side is that it will be harder to build and it will cost you the 3dB of extra SPL you would have obtained by using two speakers in the normal sealed or ported enclosure. However using two speaker doubles the power that the you can use so I wouldnt worry about 3dB if space is tight.

        Comment


        • #5
          Yeah, thats another possibility, I didn't think of that one, but I know what your talking about..

          Comment


          • #6
            I think you can have too loud... I went to an Australian electronics shop called Jaycar, and they had an isobaric speaker setup in a small room, (not in the main part of the shop), and they were demonstrating it to someone, and it was soooo loud, that I,(from about 20meters away, and in a different room), could hardly even hear what my dad was yelling to me.. I personally think that one good quality sub would be enough..
            If you wanna check one of these out, look at this...

            The website, if you want to buy one, (dare I suggest it), then go to www.jaycar.com.au and then search for part number .... It doesn't have a part number?? ohh well....

            The kit costs $560 Australian and comes with 2 subs, the box in knockdown form and a 65wrms amp, (a bit weak, I know, but for $120 more you can get the 150wrms amp.. The amps are the type that mount in the back of the case, so, there is already a hole in the back for it, so, this kit wouldn't be sutiably for in the car..

            [ 09-19-2001: Message edited by: SkinnyBoy ]

            Comment


            • #7
              Sorry for replying to my own posts, but I found an article in an Electronics Australia Mag about the isobarik kit sold by jaycar, I scanned the pictures, and have uploaded them, here they are...

              web page

              It seems good, and only uses cheapish subwoofers.. in my opinion.. What do you think??
              Sorry if the site takes a long time to load, its got 1meg of pictures.. not that bad??

              Comment


              • #8
                verry nice !!
                ive worked it out using blaubox
                ive got enough space to install a 2.5Cu
                sealed box , in my cab.. but im still looking 2 c wheteher i can maybe use a beter box enclosure !
                thnx alot 4 ur input isobaric box's
                im checkin it out !
                If its 2 loud ur Old ,;-)

                Comment


                • #9
                  Originally posted by SkinnyBoy:
                  <STRONG>I think you can have too loud... I went to an Australian electronics shop called Jaycar, and they had an isobaric speaker setup in a small room, (not in the main part of the shop), and they were demonstrating it to someone, and it was soooo loud, that I,(from about 20meters away, and in a different room), could hardly even hear what my dad was yelling to me.. I personally think that one good quality sub would be enough..
                  If you wanna check one of these out, look at this...
                  The website, if you want to buy one, (dare I suggest it), then go to www.jaycar.com.au and then search for part number .... It doesn't have a part number?? ohh well....

                  The kit costs $560 Australian and comes with 2 subs, the box in knockdown form and a 65wrms amp, (a bit weak, I know, but for $120 more you can get the 150wrms amp.. The amps are the type that mount in the back of the case, so, there is already a hole in the back for it, so, this kit wouldn't be sutiably for in the car..

                  [ 09-19-2001: Message edited by: SkinnyBoy ]</STRONG>
                  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!
                  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.

                  Comment


                  • #10
                    Originally posted by Fosgate:
                    <STRONG>
                    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!</STRONG>
                    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!



                    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 have always stuck to sealed enclosures with my installs and have been more than happy...... saves the heartache and stress of designing/building a more advanced box design....
                    Project - GAME OVER :(

                    Comment


                    • #11
                      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).

                      Comment


                      • #12
                        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 ]

                        Comment


                        • #13
                          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 :(

                          Comment


                          • #14
                            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.

                            Comment


                            • #15
                              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??

                              Comment

                              Working...
                              X