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Best way to isolate a sub?

Discussion in 'Subwoofers' started by belgrade, Dec 28, 2004.

  1. belgrade

    belgrade
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    Hi all,

    As the title suggests, just want to find out the best way to isolate a downward firing sub (bk xls200) from laminate flooring.

    I was thinking of popping down to Wickes/B&Q and getting a paving slab.
    Will this improve things, and should I carpet the paving slab? Will this make any difference or is it just plain silly? :confused:

    Cheers
    Ad
     
  2. Dfour

    Dfour
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    The paving slab is a good idea and will work. I dont think carpeting the paving slab will make musch difference. Try it and see. Might make it more WAF though:D
     
  3. bob1

    bob1
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    People have done this before , if it works replace it with some marble ,it will look at lot nicer ,if that matters to you/others.
     
  4. Dfour

    Dfour
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    Another idea is to stick one on top of the sub as well and make a 'concrete sandwich' I have found it increases the bass responce. Makes it tighter. Again you have to tweak and play :D
     
  5. bob1

    bob1
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    Shoudn't that be a sub sandwich :laugh: .
     
  6. Dfour

    Dfour
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    Yeah. can you imagine trying to find a slab big enough for thePB10 to sit on and the WAF of it!!! :eek:
     
  7. bob1

    bob1
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    :rotfl: I had some big enough for the job ,i doubt the floor could take it :nono: .
     
  8. rOAdeh

    rOAdeh
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    auralex gramma?
     
  9. avanzato

    avanzato
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    My Nubert sub comes with no spikes but four circular foam pads for isolation, the Germans don't use carpet much on their floors. The foam is quite hard and not that compressible. You can buy them from Nubert if you can navigate a German language site or there is a thread for a DIY Gramma platform by Gary Lightfoot if you search for it.
     
  10. Kenny Glasgow

    Kenny Glasgow
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    Belgrade

    Have a look at Russ Andrew's site

    http://www.russandrews.co.uk

    His Oak Cone Feet may be an answer. They come in various sizes and can be stained/painted to suit your decor.

    He offers a 60 day money-back guarentee if not fully satisfied :thumbsup: Don't stain/paint them until you are though :D
     
  11. belgrade

    belgrade
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    Right then, chaps, I'll be off to get that paving slab then. :thumbsup:

    Might carpet it, (but I think I'll give the underlay a miss :D )

    One thing though, should I sit the xls200 on the slab, using the puck feet which it comes fitted with, or should I attach spikes to the bottom of the feet? The spikes are supplied as well.

    Cheers
     
  12. Nimby

    Nimby
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    Spikes don't like concrete and quickly wear to a blunt pencil point.
    I place a small copper coin between my spikes and my concrete slabs.

    But I strongly suggest you experiment with whatever feet are offered with your own speakers or subwoofer. You never know what you might discover. Or perhaps not. Wishful thinking is hard to ignore.

    Concrete slabs are not kind to nice surfaces and should be seperated from floors with bits of carpet or hard foam. Placing a slab on top of a subwoofer will require some protection from the rough slab. Or your pretty veneer or paint finish can be badly damaged.

    Nimby
     
  13. belgrade

    belgrade
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    I've just been down to the local B&Q's. The concrete slabs that I found were a little too big for my liking, and the space reserved for the sub. However I saw some marble and granite floor tiles. These were 30cm by 30cm, and 1cm thick. the bk is just under 30 by 30cm so will fit on these tiles.

    However will they be sufficient for the job, or does a sub need something really meaty like the concrete slabs mentioned?

    If they will do the same job as the concrete slab, I will be pleased as they are more discrete and will fit more easily into the space provided.

    Cheers
     
  14. bob1

    bob1
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    There's only one way to find the answer to your question and thats try it.
    If its a cheep option i would go for it.The auralex gramma metioned is a purpose built isolator and seems to work so reports sugest,but i'm not shure about down firing subs on one of these and they don't come cheap.
     
  15. Madskilzz

    Madskilzz
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    Try a local Stone Mason or Floor tile specialist. I phoned companies local to me and found a Lebanese Granite Specialist who already had 30cm X 30cm granite tiles which were a couple of inches thick. Top and sides were already polished; the bottom of the slab was unpolished. When I explained what it was for they were most intrigued and even bevelled the edges and smoothed the unpolished side for no extra cost. £25 well spent.
     
  16. Smurfin

    Smurfin
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    I asked this question of downward firing subs sometime ago, from memory the answer was "no it doesn't work". For the life of me, I can't work out why :confused:
     
  17. SamirP

    SamirP
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    Smurfin I think that Adz over came the problem of how to use a gramma effectivly with a downward firing sub, by using the Gramma upside down with a paving slab on top, so your sub sits on the paving slab.
     
  18. belgrade

    belgrade
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    Another question for any xls200 owners - If you are using the metal feet supplied with the df version, do you take the nylon screws out of the bottom of the feet, or leave them in?

    I was repositioning my sub yesterday, and I noticed that the sub was not sitting directly on the metal feet, but on the screws going through the middle. Just got me wondering whether these screws were meant to be taken out, so that the feet sit flush on the floor (or paving slab in my case).
    Will the sub not be more stable and less prone to vibration, if this is done?

    I also noticed that one of the screws fixing the driver to the unit, was quite loose. Tightened it, but found this surprising as sub is only 2 months old. :rolleyes:
     
  19. lowrider

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    I use superspikes, they work (see measurement on site), look good and cost around 50 euros... :cool:

    http://www.soundcare.no/
     

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