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8 ohms or 16??

Discussion in 'Recording' started by edaub1, Jul 24, 2009.

  1. edaub1

    edaub1 Active Member

    Im building an isolation cabinet to record guitars...I want to buy a 12" Celestion Greenback speaker for it. I have the option to buy it at 8 ohms or 16. What should I choose? Does it depend on the amp head?

    I plan to run a couple different heads through it..
     
  2. hueseph

    hueseph Well-Known Member

    8 ohms is more common. Some things to consider:

    -isolate the input jack from the speaker. Build a small box inside the speaker box, fill it with foam or insulation and seal it with epoxy or silicone otherwise the jack will be a major source of leakage.

    -do the same for the mic output jack on the other side. Of course, before you seal either of these ends, you want to make sure all of the contacts have a very good connection and that there are no possibilities for shorts.

    - if you can, try to use the same types of clasps that are used on a guitar case and use thick foam insulator like you would use on a door jam to ensure a good seal.

    (yes, I've thought about this a lot. but thus far have settled for emulation)

    Have fun and post some pics when you are done.
     
  3. edaub1

    edaub1 Active Member

    when you say "input jack" what do you mean?
     
  4. hueseph

    hueseph Well-Known Member

    Speaker input.
     
  5. Kev

    Kev Well-Known Member

    gut feeling would be to have the 16 ohm
    BUT

    in addition to this I think you need a LOAD / Soak

    something that can load the different Amp Heads the way you want and some circuitry to then drive the 16 ohms to different volume levels to suit your mic and the sound you want from the speaker.

    might seem complicated but there is info out there and some commercial products you can take inspiration from
     
  6. hueseph

    hueseph Well-Known Member

    If the amp has an 8 ohm speaker output and the speaker he uses is rated at 100 watts wouldn't that be sufficient?
     
  7. Kev

    Kev Well-Known Member

    yes
    just providing the possibilities of other amp heads and various volumes etc
    so as not to annoy the neighbours
    and to get different tones

    if it is just for the one amp head and it is 8ohm ... then go for the 8 ohm speaker

    but he did say
    " I plan to run a couple different heads through it.. "
     
  8. hueseph

    hueseph Well-Known Member

    Right, I missed that. Just asking cause I wanna know if there's a reason behind it. Apparently there was.
     
  9. Kev

    Kev Well-Known Member

    it's all good

    we need edaub1 to post back
    and let us know if we have helped him
    or if he needs more info to go on with his isolation cabinet building project

    everyone knows I like a bit of DIY
    :)
     
  10. edaub1

    edaub1 Active Member

    thanks guys. Im waiting on some parts ive ordered to come..I ended up going with the 8 ohms speaker. I will post pics when complete along with soundclips hopefully
     
  11. edaub1

    edaub1 Active Member

    one more question: what do i need to hook up the speaker to an input jack im going to have on the box
     
  12. Kapt.Krunch

    Kapt.Krunch Well-Known Member

    Solder iron, solder and wire. Connect lug from tip of jack to + of speaker. Connect lug from ring of jack to - of speaker.

    8 ohms is a good useful impedance. Just be careful with what amp you plug into it. Some amps are more forgiving of an impedance mismatch of one step higher or lower than its rated output impedance. Many Fenders can handle, say, an 8-ohm speaker connected to a 4-ohm output. Most Marshalls will not tolerate an impedance mismatch well at all.

    Just be careful that whatever amp you use will be able to run that speaker. If you're not sure, do some research. If still not sure...ask. Don't risk frying an amp with an experiment.

    Kapt.Krunch
     
  13. edaub1

    edaub1 Active Member

    awesome thanks. What about wires? (to hook speaker to jack) should i use a certain type?
     
  14. RemyRAD

    RemyRAD Guest

    Your cabling will be extremely short. in that respect, 18 gauge zip cord would be quite adequate. On longer runs, I recommend 12 gauge Which is more than adequate.

    Personally, I would have gone with the 16 ohm speaker fed from an amplifier designed for 8 ohms. Why? Because you'll have to push the amplifier harder which will give you more of the amplifiers characteristics sound at a lower output level. But, you got the 8.

    How loud do you need this?
    Mx. Remy Ann David
     
  15. Kev

    Kev Well-Known Member

    well I did suggest the 16
    and some extra bits to allow for options later
    and to create more variety in amp tones

    for speaker wires
    I tend to use power cord for across the floor stuff
    then pull the individual cores out for separate internals
    but
    that's a typical 10 amp 240Volt Australian power cable
    and I don't know what you guys have at the local store

    " 18 gauge zip cord .... 12 gauge .... " :? ... doesn;t mean much to us down under
    we tend to talk mm cross-section are
    " She'll be right mate "
    :)
     

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