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  • New to this forum! Have a Few Quesions

    First off Hello!

    I have been looking around this forum for a few days now and I must say I am very impressed with the amount of knowledge here. So much knowledge that I am having trouble find out what I need to know.

    I am interested in building a set of home theater speakers. I want to go with a 2 way set-up.

    1. My receiver has 8 ohm outputs and I was wondering how I should wire the speakers. Should I have a 4 ohm mid woofer and a 4 ohm tweeter wired in series so that it comes out to 8 ohm? I am not sure how else to do it.

    2. For my center channel speaker how should I set it up? As in do I have 1 woofer and 1 tweeter in that speaker, also or should i have more then one mid driver and more then one tweeter and if so how would I wire it.

    Thanks.

  • #2
    Re: New to this forum! Have a Few Quesions

    I strongly recommend you start with a proven design. There are several designs in the project showcase, which would be a good place to start.

    Curt's speaker page (http://speakerdesignworks.com/index.html) has some designs that work for HT, as does Paul (http://sites.google.com/site/undefinition/diy), Lou (http://speakers.lonesaguaro.com/speakers/), and Wolf (http://techtalk.parts-express.com/blog.php?u=4102 ). Roman (http://www.rjbaudio.com/projects.html) has some designs as well. I would recommend his Cerberus sub if space is a consideration.
    There are many others on this site. Just search a bit.
    I was so much older then, I'm younger than that now.
    OS MTMs http://techtalk.parts-express.com/sh...d.php?t=220388
    Swope TM http://techtalk.parts-express.com/sh...d.php?t=221818
    Econowave and Audio Nirvana AN10 fullrange http://techtalk.parts-express.com/sh...d.php?t=216841
    Imperial Russian Stouts http://techtalk.parts-express.com/sh...=1#post1840444
    LECBOS. http://techtalk.parts-express.com/sh...ghlight=lecbos

    Comment


    • #3
      Re: New to this forum! Have a Few Quesions

      Wow, Thanks for the quick reply! These designs are awesome, lots of great ideas. I am still confused through. When wiring the internal crossover and drivers, how is it usually done? If my receiver is only 8 ohm so I use a 4 ohm mid and a 4 ohm high then wire them in series so that it comes out to 8 ohm?

      Comment


      • #4
        Re: New to this forum! Have a Few Quesions

        assuming you don't have multiple drivers wired to the same section of the crossover (eg. a 2-way mtm), the drivers aren't really wired in series or parallel, per say. they're crossed over to each other. since the drivers are playing in different passbands, their individual impedances have close to zero effect on each other, and a given drivers impedance is what the receiver will see for said drivers passband. wolf does a good job of explaining it here and here

        Comment


        • #5
          Re: New to this forum! Have a Few Quesions

          Originally posted by Cardsin2005 View Post
          Wow, Thanks for the quick reply! These designs are awesome, lots of great ideas. I am still confused through. When wiring the internal crossover and drivers, how is it usually done? If my receiver is only 8 ohm so I use a 4 ohm mid and a 4 ohm high then wire them in series so that it comes out to 8 ohm?

          Welcome to the forum! If your HT receiver or amp isn't rated for a 4 ohm load, then you'll have to choose an 8 ohm woofer and possibly an 8 ohm tweeter. The receiver/amp will "see" mostly the impedance of the woofer. It has to do with the crossover (XO), but at this stage, best to stick with a proven design, rather than trying to design your own XO from scratch...and understand all the variables involved in getting a woofer and a tweeter to blend well and "play nice" together, no matter what their impedance is. A driver is never a constant 4 or 8 ohms, as the impedance changes with frequency. The 4-8 ohm rating is "nominal" or the average impedance. There's a learning curve associated with using the measured data from each driver and using that to help with the XO design process. It can't really be explained in a few paragraphs, especially if you're just starting out. Be sure to read Paul Carmody's DIY pages:

          http://sites.google.com/site/undefinition/diy

          There are projects listed, but on the right are the pages you'll want to read. "Getting Started In DIY", and the MFAQ's parts 1 & 2, and "More Frequently Asked ?'s". Paul does a much better job than I could explaining the details. You also need to consider if you just want to build one project that will satisfy your needs for HT and/or music, or will you might want to try other designs. Maybe eventually design a project on your own from scratch and look at it as a fun hobby. And do you want to build your own enclosures or use some of the very nice pre-built cabinets? To build a speaker cabinet you'll need a place to make it and some tools. There are many factors to consider, but start with Paul's excellent write-ups. The best book available for beginners is Ray Alden's "Speaker Building 201". Written in a noob-friendly manner, it can answer many of your questions in a non-technical way.

          Take it from someone who had many of the same questions you have right now, about 10 years ago. If you try to go it on your own with no design experience, you won't like the end result, or it'll take too much time to learn the process and become proficient at it. I tried for years to get the textbook XO formulas and the pre-made XO's to work...never did. The sound quality (SQ) I got was not acceptable. The guys here set me on the right path. I have a unique perspective coming from the employment background I have had. Rather than waste time repeating it here, if you have a little extra time, read my blogs. I go into more detail about where I worked for 20 years and how I got into the DIY speaker thing. We want your project to be successful, and the wealth of collective knowledge here can help you achieve that. If you follow the suggestions and ideas, you'll have something that will rival or surpass the SQ from most of the available offerings in the retail market...for the same or less $$. There are designs meant to work for the front left & right, center and surround/rear channels. The TriTrix is a fine example:

          http://speakerdesignworks.com/Tritrix_pg_1.html

          Plus it's an 8 ohm rated design, making it very friendly to most any HT receiver/amp. Some of the lower priced HT receivers don't do well with a 4 ohm rated speaker, so Curt's design is an excellent choice. And don't think that by building someone else's design that it will diminish your enjoyment or the amount you'll be learning about speaker design. Good luck and let us know if you have any more questions or concerns.

          John A.
          "Children play with b-a-l-l-s and sticks, men race, and real men race motorcycles"-John Surtees
          Emotiva UPA-2, USP-1, ERC-1 CD
          Yamaha KX-390 HX-Pro
          Pioneer TX-9500 II
          Yamaha YP-211 w/Grado GF3E+
          Statement Monitors
          Vintage system: Yamaha CR-420, Technics SL-PG100, Pioneer CT-F8282, Akai X-1800, Morel(T)/Vifa(W) DIY 2-way in .5 ft3
          Photos: http://custom.smugmug.com/Electronic...#4114714_cGTBx
          Blogs: http://techtalk.parts-express.com/blog.php?u=2003

          Comment


          • #6
            Re: New to this forum! Have a Few Quesions

            Just to second John's reply. The Tritrix package from Parts Express is a ridiculously good deal. Lots of folks have built them, lots of happy builders.
            I was so much older then, I'm younger than that now.
            OS MTMs http://techtalk.parts-express.com/sh...d.php?t=220388
            Swope TM http://techtalk.parts-express.com/sh...d.php?t=221818
            Econowave and Audio Nirvana AN10 fullrange http://techtalk.parts-express.com/sh...d.php?t=216841
            Imperial Russian Stouts http://techtalk.parts-express.com/sh...=1#post1840444
            LECBOS. http://techtalk.parts-express.com/sh...ghlight=lecbos

            Comment


            • #7
              Re: New to this forum! Have a Few Quesions

              Agree with everything I've seen here Cards. Go the route of building something proven and you'll assure your success. Run through the Project Showcase or go through any of the other recommended sites.....but make sure you come back here when you have questions! Not a better site in the world for wise, accurate, and useful advice.

              Comment


              • #8
                Re: New to this forum! Have a Few Quesions

                Originally posted by Cardsin2005 View Post
                1. My receiver has 8 ohm outputs and I was wondering how I should wire the speakers. Should I have a 4 ohm mid woofer and a 4 ohm tweeter wired in series so that it comes out to 8 ohm? I am not sure how else to do it.

                2. For my center channel speaker how should I set it up? As in do I have 1 woofer and 1 tweeter in that speaker, also or should i have more then one mid driver and more then one tweeter and if so how would I wire it.
                I also strongly agree with those who are advising you to build an existing design. To give you more designs to look at, I recommend the Zaph ZMV5:

                http://www.zaphaudio.com/ZMV5.html

                The drivers are very inexpensive and the close driver spacing makes the speaker behave almost as a point source, which is very nice for HT usage as fronts or surround or even the center channel.

                The best way to learn the ropes is to start with one of these designs then try to build something just a little different. If you throw something together from scratch with no experience it will most likely be awful.
                Action speaks louder than words but not nearly as often. -- Mark Twain

                Comment


                • #9
                  Re: New to this forum! Have a Few Quesions

                  If this is your first build, try to keep things as simple and basic as possible. The Tri Trix kit is pretty easy to understand and assemble. Should be some two ways in project showcase that keeps x-overs and overall build easy to complete for a first timer! Don't be afraid to ask questions here to keep you on the straight and narrow

                  Comment


                  • #10
                    Re: New to this forum! Have a Few Quesions

                    Originally posted by Cardsin2005 View Post
                    Wow, Thanks for the quick reply! These designs are awesome, lots of great ideas. I am still confused through. When wiring the internal crossover and drivers, how is it usually done? If my receiver is only 8 ohm so I use a 4 ohm mid and a 4 ohm high then wire them in series so that it comes out to 8 ohm?
                    If you choose an existing design you do not need to worry about wiring it up. It will all be documented for you to follow.

                    What you do want to understand from the design is the Minimum impedance. Based on your receiver, you want to stick to 8 Ohm designs. The resistance in a design is not solely dictacted by driver impedances. Also - driver impedances aren't flat. The published driver impedance is the nominal impedance - not necessarily the minimum and certainly not the maximum. This is because impedance rises with frequency due to voice coil inductance.

                    If you don't understand what I'm saying, then that is good and proves you should stick to an existing design from a reputable designer. The names mentioned in this thread are a good start. Look at their 8 ohm nominal designs. More drivers in a design doesn't necessarily mean lower impedance. Look for 8 ohm designs. More drivers usually means better power handling and lower frequency output.

                    Comment


                    • #11
                      Re: New to this forum! Have a Few Quesions

                      not sure what amp you have but, even those that are not 4or6 ohm certified, will do it just fine. my onkyo for example.
                      " To me, the soundstage presentation is more about phase and distortion and less about size. However, when you talk about bass extension, there's no replacement for displacement". Tyger23. 4.2015

                      Quote Originally Posted by hongrn. Oct 2014
                      Do you realize that being an American is like winning the biggest jackpot ever??

                      http://www.midwestaudioclub.com/spot...owell-simpson/
                      http://s413.photobucket.com/albums/pp216/arlis/

                      Comment


                      • #12
                        Re: New to this forum! Have a Few Quesions

                        Originally posted by Cardsin2005 View Post
                        Wow, Thanks for the quick reply! These designs are awesome, lots of great ideas. I am still confused through. When wiring the internal crossover and drivers, how is it usually done? If my receiver is only 8 ohm so I use a 4 ohm mid and a 4 ohm high then wire them in series so that it comes out to 8 ohm?

                        You really want to read "Speaker Building 201".

                        Comment

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