Hookup of Bass Shakers

Discussion in 'Home Theater Projects' started by Kincade, Oct 1, 2004.

  1. Kincade

    Kincade Second Unit

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    So I just picked up another 6 bass shakers, for a grand total of 8 Aura bass shaker pros. There will be 4 in each couch.

    Trouble is, I know Ohms law about as well as rocket science. ;-)

    I can either get a 1-200 watt PE plate amp and use that in mono; or I have an older QSC pro amp that I can use in mono or stereo.

    So how do I determine how large of an amp I need, and what load to present it with? I've read through the archives, but never figured out HOW to do it.

    Thanks in advance for any advice!

    FWIW, parts express is out of them; and only 1 guy on ebay has any left. If you want 'em, better jump on them right now!
     
  2. MichaelDDD

    MichaelDDD Supporting Actor

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    Mike
    How many ohms is each shaker? I seem to remember it's either 4 or 8 ohms apiece.

    Check this out; it'll give you some very good ideas.

    Linky

    Ohms is ohms. [​IMG]

    If the shakers are 8 ohms, wire two in parallel
    (+'s and -'s together) for a 4-ohm load, etc.
     
  3. Joe L.

    Joe L. Stunt Coordinator

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    There are a lot of posts on this topic, and a lot of incorrect wiring diagrams.

    This post on AVS, in a fairly long BassShaker thread, describes how an incorrect wiring diagram in that thread led to uneven power distribution to their shakers.

    There is no way to wire 8 shakers that results in a 4 ohm load to a single channel amplifier and still have them all get equal power (and shake equally)

    The same post also pointed to a wiring diagram supplied by PartsExpress that correctly illustrated how to wire 8 shakers to connect to a single channel amplifier for a 8 ohm load.

    http://www.avsforum.com/avs-vb/showt...59#post3990759

    If you have a two channel amplifier, you can put four shakers in series/parallel on each channel and they will present a 4 ohm load to the amp.

    You might want to read the entire thread, but as I mentioned, some of the wiring drawings for 8 shakers are just plain wrong. (uneven shaking and/or incorrect calculation of the resulting impedance load to the amplifier)

    Joe L.
     
  4. Kincade

    Kincade Second Unit

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    Michael,

    The bass shakers ar 4 ohm 50 watt drivers.

    Joe,

    Thanks for the information. I just read that thread, and saw where the diagram for 8 shakers was diagnosed as incorrect.

    So - I can do 8 shakers at an 8 ohm load; and for that, I'd want to look at the wattage on the amp to see what it is at 8 ohm bridged mono?

    If I want to present a 4 ohm load, I need to go to 2 channels; no way to do it mono?

    Hopefully I am understanding that correct.
     
  5. Joe L.

    Joe L. Stunt Coordinator

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    Kincade,

    You've got it... exactly. With 8 shakers you can have one 8 ohm load for one channel, or two 4 ohm loads for two channels, or, if your amplifier could handle very low impedance loads, a 2 ohm, or .5 ohm load.

    Different ways to wire 8 (4 ohm) shakers so they each get an equal amount of power and therefore each shake the same amount.

    8 SHAKERS, SINGLE CHANNEL AMPLIFIER
    Code:
     +---[+Shaker-]------[+Shaker-]--------[+Shaker-]------[+Shaker-]-----+
     | | 
     | +-----------------------------------------------------------------+
     | |
     | +-[+Shaker-]------[+Shaker-]--------[+Shaker-]------[+Shaker-]----+
     | |
     | |
     | 8 shakers in series, 32 Ohm Load to Amplifier |
     +----------------------------- + Amplifier - -----------------------+
     

    OR

    Code:
     +---[+Shaker-]------[+Shaker-]--------[+Shaker-]------[+Shaker-]-----+
     | |
     +---[+Shaker-]------[+Shaker-]--------[+Shaker-]------[+Shaker-]-----+
     | |
     | |
     | 8 Ohm Load to Amplifier |
     +----------------------------- + Amplifier - -----------------------+
     

    OR

    Code:
     +--[+Shaker-]----[+Shaker-]----+ +----[+Shaker-]----[+Shaker-]-----+
     | | | |
     | +---+ |
     | | | |
     +--[+Shaker-]----[+Shaker-]----+ +----[+Shaker-]----[+Shaker-]-----+
     | |
     | |
     | 8 Ohm Load to Amplifier |
     +----------------------------- + Amplifier - -----------------------+
     

    OR

    Code:
     +--[+Shaker-]-+ +--[+Shaker-]--+ +--[+Shaker-]-+ +--[+Shaker-]--+
     | | | | | | | |
     | +---+ +---+ +---+ |
     | | | | | | | |
     +--[+Shaker-]-+ +--[+Shaker-]--+ +--[+Shaker-]-+ +--[+Shaker-]--+
     | |
     | |
     | 8 Ohm Load to Amplifier |
     +------------------------------- + Amplifier - ----------------------+
     


    OR

    Code:
     Note: Most amplifiers will NOT work well with a 2 Ohm load.
     +---[+Shaker-]------[+Shaker-]-----+
     | |
     +---[+Shaker-]------[+Shaker-]-----+
     | |
     +---[+Shaker-]------[+Shaker-]-----+
     | |
     +---[+Shaker-]------[+Shaker-]-----+
     | |
     | |
     | 2 Ohm Load to Amplifier |
     +-------- + Amplifier - ----------+
     


    OR

    Note: Most amplifiers will consider a .5 Ohm load a short circuit and either shut-down, overheat, or, self-destruct. (There are a few amps that can drive a .5 ohm load, so this wiring diagram is not completely out of the question)

    Code:
     +--------[+Shaker-]-------+
     | |
     +--------[+Shaker-]-------+
     | |
     +--------[+Shaker-]-------+
     | |
     +--------[+Shaker-]-------+
     | |
     +--------[+Shaker-]-------+
     | |
     +--------[+Shaker-]-------+
     | |
     +--------[+Shaker-]-------+
     | |
     +--------[+Shaker-]-------+
     | |
     | |
     | .5 Ohm Load to Amplifier|
     +---- + Amplifier - -----+ 
     


    TWO CHANNEL AMPLIFIER, 8 SHAKERS
    Code:
     +--[+Shaker-]----[+Shaker-]----+ +---[+Shaker-]----[+Shaker-]----+
     | | | |
     | | | |
     +--[+Shaker-]----[+Shaker-]----+ +---[+Shaker-]----[+Shaker-]----+
     | | | |
     | | | |
     | 4 Ohm Load to Amp Chan A | | 4 Ohm Load to Amp Chan B |
     +------- + Amplifier - -------+ +------- + Amplifier - --------+
     

    OR

    Code:
     +--[+Shaker-]-+ +-[+Shaker-]---+ +---[+Shaker-]-+ +-[+Shaker-]---+
     | | | | | | | |
     | +--+ | | +--+ |
     | | | | | | | |
     +--[+Shaker-]-+ +-[+Shaker-]---+ +---[+Shaker-]-+ +-[+Shaker-]---+
     | | | |
     | | | |
     | 4 Ohm Load to Amp Chan A | | 4 Ohm Load to Amp Chan B |
     +------- + Amplifier - --------+ +------- + Amplifier - ---------+
     


    As you might have read in the other thread, the Aura shakers are pretty efficient and do not need lots of power to drive them.

    I personally have 4 (non-pro) shakers in series/parallel resulting in a 4 ohm load connected to a plate amplifier I scavenged from one of the $99 subwoofers PartsExpress was selling several years ago. I would guess the output power to be at best 75 watts.

    At that power level, there is no way I can turn the shaking amp up and use all that power without it becoming annoying rather than adding to the experience. A 200 watt amp would have been way overkill.

    If your amplifier has 50 watts output, the odds are you will be fine. For anything bridgable, you will probably get higher power than that, even at 8 ohms.

    One last thing, the 50 watt rating of the Shakers is how much power the shaker will handle before suffering a thermal failure, not how much power it takes to get them to shake so give it a try with your existing amplifier before deciding if you need more power.
     
  6. Kincade

    Kincade Second Unit

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    Wow, thanks for all the diagrams! That should suit me just fine!

    Hmmmm; so maybe I can't use this pro audio amplifier; it sounds like it would be a waste.

    Are there any other options other than 2 mono subwoofer amps or a huge receiver (won't fit in my rack)?
     
  7. Kincade

    Kincade Second Unit

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    Bringing this back; I'm thinking of doing just 6 instead of all 8 (that might be too much). I'd like to present the amp with a 4-8 amp load.

    Is there a way to do (6) 4-ohm bass shakers and present the amp with a 4-8 ohm load?

    Thanks to all of you!
     
  8. Kincade

    Kincade Second Unit

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  9. Joe L.

    Joe L. Stunt Coordinator

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    Kincade,

    You've got it... exactly. With 6 shakers you can have one 6 ohm load for one channel, or two 12 ohm loads for two channels, or, if your amplifier could handle very low impedance loads, a 2.8 ohm or .6 ohm load

    Different ways to wire 6 (4 ohm) shakers so they each get an equal amount of power and therefore each shake the same amount.

    6 SHAKERS, SINGLE CHANNEL AMPLIFIER
    Code:
     +---[+Shaker-]------[+Shaker-]--------[+Shaker-]------+
     | |
     | +--------------------------------------------------+
     | |
     | +-[+Shaker-]------[+Shaker-]-------[+Shaker-]------+
     | |
     | |
     | 6 shakers in series, 24 Ohm Load to Amplifier |
     +----------------- + Amplifier - --------------------+
     

    OR

    Code:
     +---[+Shaker-]------[+Shaker-]--------[+Shaker-]---+
     | |
     +---[+Shaker-]------[+Shaker-]--------[+Shaker-]---+
     | |
     | |
     | 6 Ohm Load to Amplifier |
     +----------------- + Amplifier - -----------------+
     

    OR

    Code:
     +---[+Shaker-]----+ +----[+Shaker-]----[+Shaker-]-----+
     | | | |
     | +---+ |
     | | | |
     +---[+Shaker-]----+ +----[+Shaker-]----[+Shaker-]-----+
     | |
     | |
     | 6 Ohm Load to Amplifier |
     +------------------- + Amplifier - --------------------+
     

    OR

    Code:
     +--[+Shaker-]-+ +--[+Shaker-]-+ +--[+Shaker-]--+
     | | | | | |
     | +---+ +---+ |
     | | | | | |
     +-[+Shaker-]--+ +--[+Shaker-]-+ +--[+Shaker-]--+
     | |
     | |
     | 6 Ohm Load to Amplifier |
     +------------------- + Amplifier - ---------------+
     


    OR

    Code:
     Note: Most amplifiers will NOT work well with a 2.6 Ohm load.
     +---[+Shaker-]------[+Shaker-]-----+
     | |
     +---[+Shaker-]------[+Shaker-]-----+
     | |
     +---[+Shaker-]------[+Shaker-]-----+
     | |
     | |
     | 2.6 Ohm Load to Amplifier |
     +-------- + Amplifier - ----------+
     


    OR

    Note: Most amplifiers will consider a .66 Ohm load a short circuit and either shut-down, overheat, or, self-destruct. (There are a few amps that can drive a .66 ohm load, so this wiring diagram is not completely out of the question)

    Code:
     +--------[+Shaker-]-------+
     | |
     +--------[+Shaker-]-------+
     | |
     +--------[+Shaker-]-------+
     | |
     +--------[+Shaker-]-------+
     | |
     +--------[+Shaker-]-------+
     | |
     +--------[+Shaker-]-------+
     | |
     | |
     |.66 Ohm Load to Amplifier|
     +---- + Amplifier - -----+ 
     


    TWO CHANNEL AMPLIFIER, 6 SHAKERS
    Code:
     +---[+Shaker-]------[+Shaker-]--------[+Shaker-]---+
     | |
     | |
     | 12 Ohm Load to Amplifier Right Channel |
     +----------------- + Amplifier - -----------------+
     
     +---[+Shaker-]------[+Shaker-]--------[+Shaker-]---+
     | |
     | |
     | 12 Ohm Load to Amplifier Left Channel |
     +----------------- + Amplifier - -----------------+
     


    OR

    TWO CHANNEL AMPLIFIER, 4 SHAKERS ON ONE CHANNEL, TWO ON THE OTHER
    Note: you will need to turn the left/right balance control off center to get the two sets of shakers to shake equally.
    Code:
     +--[+Shaker-]----[+Shaker-]----+
     | |
     | |
     +--[+Shaker-]----[+Shaker-]----+ +---[+Shaker-]----[+Shaker-]----+
     | | | |
     | | | |
     | 4 Ohm Load to Amp Left Chan. | | 8 Ohm Load to Amp Right Chan |
     +------- + Amplifier - -------+ +------- + Amplifier - --------+
     

    OR

    Note: you will need to turn the left/right balance control off center to get the two sets of shakers to shake equally.
    Code:
    +--[+Shaker-]--+ +---[+Shaker-]---+
     | | | |
     | +----+ |
     | | | |
     +--[+Shaker-]--+ +---[+Shaker-]---+ +---[+Shaker-]----[+Shaker-]----+
     | | | |
     | | | |
     | 4 Ohm Load to Amp Left Chan. | | 8 Ohm Load to Amp Right Chan |
     +---=---- + Amplifier - ------------+ +------- + Amplifier - --------+
     
     


    Hope this helps...

    Joe L.
     
  10. Kincade

    Kincade Second Unit

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    Thanks again; I just wanted to make sure I got it right the first time!
     

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