[James Romeyn]

What is recommended minimum spike height on carpeted surface for a H.O. super-duty 10" sub driver (17 lb/600Wrms/12mm linear excursion driver faces wall, 2" D x 19" length round port exits the base)?

Thanks!   

[gerald porzio]

Sounds like an open book test. Put new AAs in those calculators. Lay in some crystal meth cause it's gonna be a long nite.

[Poindexter]

My understanding, and experience, is that the distance from the floor for a downfiring port is one of the main tuning, ah, knobs, for this configuration.  I would think it outside the realm of modeling; try, tweak, listen.

Aloha,

Poinz
AudioTropic

[BobM]

Can we assume this is a sub that you are building yourself? If not, then I would strongly suggest you use what the manufacturer planned for that sub.

If you're building it then you also probably know that not all sub speakers are the same in terms of their orientation. Some cones need to be played on their side, firing out, and some can handle the true up and down motion that a down or up firing position dictates.

Goof luck with your experiments.

[James Romeyn]

Can we assume this is a sub that you are building yourself?

Yes.

If not, then I would strongly suggest you use what the manufacturer  planned for that sub.

If you're building it then you also probably know that not all sub speakers are the same in terms of their orientation. Some cones need to be played on their side, firing out, and some can handle the true up and down motion that a down or up firing position dictates.

Thanks for the above reminder. 

At this moment the sum total concern is the minimum recommended clearance from a horizontal line across the exit of the down-firing port (2"D) to the tips of the three cone spike supports, with the estimated 65 lb sub sited on a carpet. 

One qualified source fastened the port to a panel inset 3/4" from a large cutout on the base, with four 3/4" wood risers capped with 3/8" thick rubber feet (sum total 1-7/8" clearance).  My speaker enclosure builder suggested three tapered-circular machined metal feet, 2-1/2" tall with 3/8" wide flat tip (will probably be too pricey).

A sum total 2" clearance seems reasonable, and would result with the port flush-mounted to the bottom panel and three of a supplier's affordable 1-1/2" tall cone spikes (with discs for hard surfaces) fastened to 1/2" wood risers on the bottom panel.