This question has been raised but not fully answered. I admit to being a scrap merchant. I acquired a faulty Tannoy FX 5.1 subwoofer for free. https://www.tannoy.com/product.html?modelCode=P0BYJ I sold the faulty plate-amp for £25. I got £28 for the driver, £16 for the feet. I was about to throw the carcass out when I realised I had another 8" driver in the tool-shed. I have some rubber feet but they are only 13mm. Do I need more ground clearance?
2-3 times Xmax at minimum. For instance the da ps-10 (df 10”) has 18mm of clearance but the bottom is a plate not feet. For an 8”driver, unless it’s high excursion you can probably get away with 13mm on a solid floor (carpet might be an issue)
It's actually possible to model this in Hornresp.
Consider the area of the curved surface of the cylinder formed between the driver surround and floor, and then simulate as an offset-driver alignment.
Chris
Consider the area of the curved surface of the cylinder formed between the driver surround and floor, and then simulate as an offset-driver alignment.
Chris
You can extend the rubber feet easily enough with some scrap, just cut 4 blocks of ply or MDF to fit, glue and screw etc
The question isn't how to extend the feet. I wanted to know whether or not I needed to.
Is the sub on hard floor or carpet?
Personally I like more clearance with downfirings drivers.
On a hard floor I extended the rubber feet on my wifes by an extra wooden packer; to give 30mm from driver edge to the hard tiled floor
Personally I like more clearance with downfirings drivers.
On a hard floor I extended the rubber feet on my wifes by an extra wooden packer; to give 30mm from driver edge to the hard tiled floor
I hadn’t thot of the xMax issue. At some point as the woofer approaches the flor it starts to become mass loaded. Sometimes this can be helpful.
As to Moondog’s comment, whenver we did a downfiring sub we added a base so that we knew what it was firing into.
dave
As to Moondog’s comment, whenver we did a downfiring sub we added a base so that we knew what it was firing into.
dave
Dave that is a very good idea, A solid plinth like a tile over thick MDF. Ours is also in a corner
I hadn't thought of applying the obvious (subjective) tests. (1) Raise the clearance by 10mm by temporarily standing the unit on plastic bottle caps. (2) Turn the unit on its back so the driver faces forwards.
Forward facing produced the best results (albeit a little boomy). The current 13mm clearance was the worst.
Forward facing produced the best results (albeit a little boomy). The current 13mm clearance was the worst.