what DIY sub should I choose?

Discussion in 'Archived Threads 2001-2004' started by Jeffrey Noel, Oct 1, 2001.

  1. Jeffrey Noel

    Jeffrey Noel Screenwriter

    Joined:
    Sep 11, 2001
    Messages:
    1,533
    Likes Received:
    0
    Trophy Points:
    0
    This will be my very first DIY project, and will by relying on you professionals for everything, except money, unless you want to help!
    I currently have a 10" Yamaha YST-SW320, which I love. It does everything I expect it to and then some. But, I really want to make my own. There's just something about a DIY. I get jealous every time I see one of your DIY subs. I have succombed to your powers! [​IMG]
    I just purchased a 250w amp with remote from partsexpress.com for only $138. All of their amps are on sale, thank GOD!!
    Anyway, which sub(size,brand,specs) would be the best for me, as it will never be in a large room. Usually pretty small rooms!
    I want the box to be small to medium, preferably front-firing.
    Any suggestions would be greatly appreciated!
    Thanks in advance!
    God bless [​IMG]
    jeffrey noel
    ------------------
    Go WILDCATS!
     
  2. Jeff Rosz

    Jeff Rosz Second Unit

    Joined:
    Sep 24, 2000
    Messages:
    335
    Likes Received:
    0
    Trophy Points:
    0
    hello jeffrey,
    there are going to be alot of questions you need to ask yourself, but here are two important questions..
    how are your woodworking skills?
    have tools?
    there are a number of notable drivers discussed here and you really cant go wrong. especially with all the good folks around here.
    quote: Any suggestions would be greatly appreciated![/quote]
    its generally a good bet to do your 1st sub sealed. so how bout a sealed shiva? but choose a driver and the type of box you like and then ask more questions.
    [Edited last by Jeff Rosz on October 01, 2001 at 08:18 PM]
     
  3. Jeffrey Noel

    Jeffrey Noel Screenwriter

    Joined:
    Sep 11, 2001
    Messages:
    1,533
    Likes Received:
    0
    Trophy Points:
    0
    Thanks Jeff!
    I am about 80% sure that I will go with the Adire Shiva. I have heard MANY great reviews about it. But, please, anyone, give me other suggestions, as I would like to see many options.
    I am also looking at making the box sealed, just because it is my first DIY. How will the Shiva sound in a sealed enclosure? Would it sound better overall in a ported enclosure?
    As I have said before, I am a DIY virgin, so I am listening to all suggestions, good or bad. I just want my sub to sound the best it can with the 250w amp I bought.
    Thanks again Jeff! Any other suggestions?
    God bless [​IMG]
    jeffrey noel
    ------------------
    Go WILDCATS!
     
  4. Jeff Rosz

    Jeff Rosz Second Unit

    Joined:
    Sep 24, 2000
    Messages:
    335
    Likes Received:
    0
    Trophy Points:
    0
    yes, go to the adire website and look at the white papers, download the lspcad program from there too. adire's drivers are preloaded into the program. fiddle around with it a bit, look at different alignments. its kinda like learning a new language.
     
  5. Jeffrey Noel

    Jeffrey Noel Screenwriter

    Joined:
    Sep 11, 2001
    Messages:
    1,533
    Likes Received:
    0
    Trophy Points:
    0
    I have been doing some work on the WinISD program for the past hour or so. From the recommendations of others and the info using WinISD, I have decided to get the Dayton 12" DVC sub.
    Here is what I have found to be a good sub/box combination:
    Box type : Vented
    Box size : 6.600 ft^3
    Tuning frequency : 22.00 Hz
    Vent : 2 vent(s)
    17.86 in length for each
    4.00 in round
    All at 1w/1m
    Relative
    Freq Gain SPL
    [Hz] [dB] [dB]
    10.00 -28.16 63.73
    15.00 -13.69 78.20
    20.00 -2.61 89.28
    25.00 0.73 92.62
    30.00 -0.09 91.80
    35.00 -0.61 91.28
    40.00 -0.81 91.08
    45.00 -0.86 91.03
    50.00 -0.83 91.06
    55.00 -0.78 91.11
    60.00 -0.72 91.17
    65.00 -0.66 91.23
    70.00 -0.60 91.29
    75.00 -0.55 91.34
    80.00 -0.50 91.39
    85.00 -0.46 91.43
    90.00 -0.42 91.47
    95.00 -0.38 91.51
    100.00 -0.35 91.54
    How does this look to you? What to change?
    Thanks!
    God bless [​IMG]
    jeffrey noel
    ------------------
    Go WILDCATS!
    [Edited last by Jeffrey Noel on October 02, 2001 at 01:14 AM]
    [Edited last by Jeffrey Noel on October 02, 2001 at 02:07 AM]
     
  6. Jack Gilvey

    Jack Gilvey Producer

    Joined:
    Mar 13, 1999
    Messages:
    4,948
    Likes Received:
    1
    Trophy Points:
    0
    That box seems a little big, Jeffrey .The best vented box I came up with for the woofer was 120 liters tuned to 18Hz, see how that looks.
    ------------------
    [​IMG]
     
  7. Jeffrey Noel

    Jeffrey Noel Screenwriter

    Joined:
    Sep 11, 2001
    Messages:
    1,533
    Likes Received:
    0
    Trophy Points:
    0
    Hey Jack. Yeah, I thought the box was a little big, but I've been having a problem with the vent category.
    What size and how many ports would you recommend? When I put in a single 4" port, WinISD shows that I need a port that is WAY too big for practically any box. I'm not really for sure what vent mach means, but it shows up in red, as in BAD.
    It won't let me customize the length of the port either.
    I just need some major help! [​IMG]
    Guess I have to learn somehow!
    So, please help!!!1
    God bless [​IMG]
    jeffrey noel
    ------------------
    Go WILDCATS!
     
  8. Jack Gilvey

    Jack Gilvey Producer

    Joined:
    Mar 13, 1999
    Messages:
    4,948
    Likes Received:
    1
    Trophy Points:
    0
    Hi,
    In WinISD, the only way to change the port length is to change the tuning frequency of the box. As you can see, increasing the port area, either through a larger diameter port or through multiple ports, requires the ports to get longer to maintain the same tuning in a given box. Also in regards to WinISD, when you enter the driver parameters, make sure you input the power of the amp you're using (250w in this case), and not the max power the driver can handle (which would give you a misleadingly high vent mach). You don't have to worry about what happens at 650 watts if you're not using that much.
    This is where the trade-off comes in for vented boxes. You need to have enough port area so vent speed (mach) isn't too high (causing noise and compressing the output), yet you need to keep the diameter reasonable so the length doesn't get out-of-hand.
    In the box I described, a 4" dual-flared port is about 21" long. Now, the airspeed is fairly high, but using a http://www.partsexpress.com/pe/showdetl.cfm?&User_ID=3042908&St=7981&St2=-47637254&St3=60587519&DS_ID=3&Product_ID=7122&DID=7
    [Edited last by Jack Gilvey on October 02, 2001 at 10:52 AM]
     

Share This Page