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  • Cheap-O Center Build

    Alright, before I get hounded for being an idiot, I'll preface with this: College budget (aka none), terrible room dynamics, new to speaker stuff in general.

    Goal: Use the two Tang Band 3" drivers ( http://www.parts-express.com/pe/show...number=299-113 )(leftoversfrom a repair) to build a cheap center channel.

    Basic info:
    Speaker Info:
    Name: W3-881SI 3"
    Type: Standard woofer
    Company: TB Speakers
    No. of Drivers = 1
    Fs = 106 Hz
    Qms = 7.17
    Vas = 0.05 liters
    Xmax = 0.5 mm
    Sd = 69 sq.cm
    Qes = 0.96
    Re = 6.6 ohms
    Le = 0.212 mH
    Z = 8 ohms
    Pe = 30 watts
    Dimensions:

    Realistically, anything is better than what I'm using as a CC right now, which is an old satellite speaker from a surround system.

    I have basic electronics knowledge if I need to add any kind of simple x-over, but I don't know if it will be necessary, I'll leave it up to you guys.

    If anyone can help me decide dimensions/layout/anything really that would be great. It really doesn't have to be perfect sound-wise, just something for me to play with to put these two drivers into use and off of my desk.
    Last edited by Adam_G; 01-25-2012, 06:54 PM.

  • #2
    Re: Cheap-O Center Build

    How would I calculate the best center-to-center measurements for these two speakers? Or should I just mount them as close together as possible?

    Comment


    • #3
      Re: Cheap-O Center Build

      Well... with the addition of a single 4 or 5 uf capacitor, you can make kind of an "inverted" 1.5 way speaker. Place them (ideally) in a vertical array, but horizontal is ok too if you get them very close.
      Don't listen to me - I have not sold any $150,000 speakers.

      Comment


      • #4
        Re: Cheap-O Center Build

        @Johnny:
        What would the advantage be to the 1.5 be? I'm not really sure what that is or what it would do for the sound. I can put them vertically given where they are going if it would be better. I know a little about comb filtering so I assumed that vertically would be better, but confirmation is always good.

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        • #5
          Re: Cheap-O Center Build

          Johnny is absolutely correct and the inverted 1.5 is an interesting concept.

          Comment


          • #6
            Re: Cheap-O Center Build

            i'd be interested to hear how the inverted 1.5-way concept works out.... but while you're adding parts to your cart, you might want to consider the nuance mylar -073 3" waveguide tweeter. johnny and i have both used versions of it (he used the larger waveguide) and were happy with it for the $2.50 price. one cap, probably one resistor, and one inductor and you could go the MTM route for not much money.
            TM (RS125/TB25-302), TM RS150S / Vifa BC25SC06, RS150-4 / Vifa ML-TL, 3CR-AL Ultra Budget: Electric Blue TM, TMM, MTM, Dragonflies , Mounties: Mini HT Satellite,sub for minions

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            • #7
              Re: Cheap-O Center Build

              Adam, I cleared my PM box out, so go ahead and resend! Or better yet, use my email.
              Don't listen to me - I have not sold any $150,000 speakers.

              Comment


              • #8
                Re: Cheap-O Center Build

                I figured you guys would like to see my work so far.... hahaha.

                For what it's worth(which is nothing): It sounds better than what I'm using as a CC already, which really scares me.



                @Johnny: I tossed you a PM about the 1.5 idea, just some clarification stuff.
                @Patrick: I definitely wouldn't mind the MTM idea, but I will need some guidance on that if I do end up going that way. I'll definitely let you know.
                Thank you both for your help by the way. : )

                Comment


                • #9
                  Re: Cheap-O Center Build

                  Dude, I dig your cardboard box work. I've run speakers like that for weeks and months sometimes. I'm going to go out a limb here, and suggest you just run them full range with no crossover for your center channel. If you are running them from a HTR, set them as "small". If you can choose a high pass of 100HZ, perfect, but 80Hz would probably work also. Listen to them for a few weeks, and figure out later if you really need a tweeter and crossover.

                  What kind of woodworking tools do you have? If not, you can get some small boxes from PE or Ikea, but you will still need some glue, a drill, and jigsaw.

                  I think I hear a difference - wow, it's amazing!" Ethan Winer: audio myths
                  "As God is my witness I'll never be without a good pair of speakers!" Scarlett O'Hara

                  High value, high quality RS150/TB28-537SH bookshelf - TARGAS NLA!
                  SB13/Vifa BC25SC06 MTM DCR Galeons-SB13-MTM
                  My Voxel min sub Yet-another-Voxel-build

                  Tangband W6-sub

                  Comment


                  • #10
                    Re: Cheap-O Center Build

                    I agree with my fellow ATLien. My nephew has a set just like this and they sound amazing with not filters. Are they perfect? Nope but they sound really really good. They don't need a tweeter at all. The 1.5 way thing does sound interesting and I think my nephew is playing with that idea now. One thing those speakers do REALLY well is the human voice. Considering that's the main function of a CC, I think you made a good choice.

                    http://www.youtube.com/watch?v=8KEvSBZvA-c

                    http://www.youtube.com/watch?v=BXPr986ldoM

                    Comment


                    • #11
                      Re: Cheap-O Center Build

                      @donradick: Haha, thanks. I'm an engineering student, which means I have to be a master cardboard craftsman from all of the stupid cardboard bridge / tower / everything projects. Right now I'm running them as small on my HT system, but it's old and a piece of junk, so I can't adjust the x-over on it. The only time I really use my CC is when I'm listening to music very quietly and for movies, so it's doing well in both of those areas as it is. For loud music I just listen in stereo. As far as the woodworking goodies, I have to wait a few weeks to head back home and grab them, or make my boxes there. I've got pretty much everything you can imagine, and I believe I actually have some very nice cherry I could play with hiding out in my garage. We will see how that goes.

                      @John: Your nephew's setup is pretty nice. It's funny, the dimensions are almost exactly the same as my cardboard box from what I can tell! Lucky pick from the trash pile. I agree that they don't really need a tweeter, since they are reasonably smooth from ~300-15k. Right now in the cardboard box they're responding better from like 1k-10k, but I think when they are properly fastened to a baffle that response will expand to what it should be. I've been looking around and seen people tuning them down below 100hz, but I don't need that since I have a subwoofer in my system.

                      For anyone: Noob question- What is a 1.5 speaker, and what is the advantage of a 1.5 speaker over whatever you would call my cardboard box speaker?

                      Comment


                      • #12
                        Re: Cheap-O Center Build

                        Originally posted by Adam_G View Post
                        @donradick: Haha, thanks. I'm an engineering student, which means I have to be a master cardboard craftsman from all of the stupid cardboard bridge / tower / everything projects. Right now I'm running them as small on my HT system,
                        For anyone: Noob question- What is a 1.5 speaker, and what is the advantage of a 1.5 speaker over whatever you would call my cardboard box speaker?
                        So, what kind of engineering student are you?

                        A 1.5 system means 2 woofer-mids run full range, but with a coil on one woofer that acts as a low pass filter and rolls if off. So you have 2 woofers running on the bottom, but only 1 driver for high mids and highs. This means you don't get "lobing". It's all detailed in the big "speaker building bible" thread above.

                        I think I hear a difference - wow, it's amazing!" Ethan Winer: audio myths
                        "As God is my witness I'll never be without a good pair of speakers!" Scarlett O'Hara

                        High value, high quality RS150/TB28-537SH bookshelf - TARGAS NLA!
                        SB13/Vifa BC25SC06 MTM DCR Galeons-SB13-MTM
                        My Voxel min sub Yet-another-Voxel-build

                        Tangband W6-sub

                        Comment


                        • #13
                          Re: Cheap-O Center Build

                          So lobing and Comb Filtering are essentially brothers-from-another-speaker. I see how the 1.5 would help now. Since the speakers aren't horizontally arranged I haven't run into any problems with it so far, which is nice.

                          I'm Industrial Engr, but I've had alot of Mechanical experience and some training in circuits and electronic concepts.

                          Comment


                          • #14
                            Re: Cheap-O Center Build

                            Originally posted by Adam_G View Post
                            So lobing and Comb Filtering are essentially brothers-from-another-speaker. I see how the 1.5 would help now. Since the speakers aren't horizontally arranged I haven't run into any problems with it so far, which is nice.

                            I'm Industrial Engr, but I've had alot of Mechanical experience and some training in circuits and electronic concepts.
                            re: lobing - BINGO - constructive and destructive interference when the wavelengths get short enough. That's why you never see 2 tweeters on a well-designed speaker.

                            I think I hear a difference - wow, it's amazing!" Ethan Winer: audio myths
                            "As God is my witness I'll never be without a good pair of speakers!" Scarlett O'Hara

                            High value, high quality RS150/TB28-537SH bookshelf - TARGAS NLA!
                            SB13/Vifa BC25SC06 MTM DCR Galeons-SB13-MTM
                            My Voxel min sub Yet-another-Voxel-build

                            Tangband W6-sub

                            Comment

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