1. Join Now

    AVForums.com uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Building Speakers

Discussion in 'Home Cinema Building DIY' started by access, Jul 28, 2005.

  1. access

    access
    Guest

    Products Owned:
    0
    Products Wanted:
    0
    Ratings:
    +0
    Hi all,
    I am new to this so If I come across as dumb it's because I am.

    I have a Teac AG-7D 6.1 AV amp and I want to build two front floorstanding speakers to use with it for a home cinema. I have at my disposal

    6 x 8" Wharfedale 100 Watts 6-8 ohms

    2 x 5" Wharfedale 100 Watts 4-8 ohms

    2 x 1" Wharfedale Tweeters 100 Watts

    Can anyone recomend what combination of the above to use in each speaker and what's the best way to wire them?
    Also if anyone can offer advice on calculating the internal volume and porting for the boxs (that I will make) it would be appreciated.

    Thanks in advance

    access
     
  2. Troon

    Troon
    Standard Member

    Joined:
    Apr 28, 2005
    Messages:
    151
    Products Owned:
    0
    Products Wanted:
    0
    Trophy Points:
    21
    Ratings:
    +2
    To calculate the box volume and porting you need some parameters for the bass units called the Thiele-Small parameters. You need at least:

    Vas - the "compliance equivalent volume"
    Qts - the Q of the total system (electrical and mechanical)
    Fs - the free air resonance frequency of the driver

    If you don't have those, or you don't have the equipment to measure them (signal generator, couple of multimeters, time and carpentry skills), give up now. You'll be guessing and will end up wasting time, money and the drivers for a sub-standard system.

    These parameters often come with new driver units; if yours are not, you'll probably struggle to get them unless you can find someone helpful at Wharfedale. Of course, it's not in their interest to help you - they could sell you some pre-built speakers...

    Best of luck.
     
  3. pwood

    pwood
    Active Member

    Joined:
    Dec 6, 2003
    Messages:
    2,479
    Products Owned:
    0
    Products Wanted:
    0
    Trophy Points:
    66
    Location:
    Central Scotland
    Ratings:
    +136
    Try Wilmslow audio as they are probably the most knowlegable on DIY speaker kits as they sell them so they may be able to advise on a suitable crossovers etc.

    http://www.wilmslow-audio.co.uk/
     
  4. Ian J

    Ian J
    Banned

    Joined:
    Aug 6, 2001
    Messages:
    25,529
    Products Owned:
    0
    Products Wanted:
    0
    Trophy Points:
    166
    Ratings:
    +4,906
    Transferring to DIY forum
     
  5. IronGiant

    IronGiant
    Moderator

    Joined:
    Jun 7, 2003
    Messages:
    52,478
    Products Owned:
    0
    Products Wanted:
    0
    Trophy Points:
    166
    Location:
    Oxford UK
    Ratings:
    +28,221
    If you can't find the Thiele-Small parameters, a way around it can be to find out which speakers Wharfedale put those drivers into, find out/calculate the volume of those boxes and use that. This assumes Wharfedale know how to calculate box sizes ;)
     
  6. access

    access
    Guest

    Products Owned:
    0
    Products Wanted:
    0
    Ratings:
    +0
    Thanks all,
    I have some of the info but will get the rest soon.

    Tweeters are model 0318
    Used in the Wharfedale Sapphire and Monitor series
    Qms 2.20
    Qes 2.35
    Qts 1.13


    5" Used in Wharfedale Diamond 6
    Qms 2.70
    Qes 0.57
    Qts 0.47
    Mms 7.48
    Cms 1.05
    Vas 9.05
    Fs 56.77 Hz

    8" drives are Model number 2065
    used on Wharfedale models Force 2180 and 3180.

    access
     

Share This Page

Loading...