Weighing down my subwoofer

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Got a new sub the other week, a REL T2 and it sounds fantastic BUT when I'm watching a movie the subwoofer will move about causing it to rattle (its on spikes on laminate flooring) what can i use to make it heavier so it can be more stable?
 
never thought of the rubber mat thing. I have those no slip mats that is still sitting rolled up.

im not too bothered about it marking the floor as in the near future the flooring will be ripped up and something else will be put in its place
 
Something is not quite right if a T2 is walking around the room when playing; especially one that's on spikes.

If it was a tiled floor then I could understand it. But a laminate floor will give a little under the weight and allow the spikes to dig in. It suggests to me that the driver is moving a lot. Way more than it should for proper integration. You might want to have a look at the settings.

RELs are impressively engineered and they'll go far louder and deeper than you'd expect from such a compact design, but that doesn't mean that the sound should be boomy and overbearing. Running the sub too hard will shorten its life.
 
Well I bought the T2 second hand, it does have 2 drivers one at the bottom and a larger front. The bottom does move quite a bit even at low volume
The sub isn't that heavy so if there is some action I can hear the sub spikes rattling on the floor
 
The sub weighs 15 kilos. The tip of each of the four spikes is roughly 1-1.5 square mm. That's roughly the equivalent of 1.5-2.25 metric tonnes per square inch pressing in to the floor per spike.

Yes, the bottom driver is the main driver, so there's some up/down force in reaction to the driver movement. However, I think we can safely presume that REL knows what it's doing when it designs subs. Making a sub that can't keep still under maximum load doesn't seem like the most sensible thing to do, and it would be picked up like a flash as an issue once the product is/was released. T2's have been around for about 7 years, and there's a distinct lack of threads shouting about this as an issue.... so putting all that together I'd still be looking at other causes. It just seems really odd you're having this issue. I wonder if you aren't hearing the driver hitting the end stops?
 
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