Spider Talk....

I thought that I should mention something I used to do years ago when playing with full range drivers, that is to add damping over the spider. The spider or inside lower cone suspension is that corrugated orange or brown fabric material which connects the cone (where it joins to the voice coil) to the basket. Most people do not realize it but the spider all by it self can and does make a lot of sound (read noise). I have found that two layers of 1/8 inch SAE rated F-11 felt cut into a doughnut shape and installed to lay flat over the spider will damp out a significant amount of "spider talk" (the noise the spider makes). This has a most impressive impact on the quality of sound your woofer makes and it also improves articulation as the noise the spider makes tends to smear transients. With very large heavy cone woofers most of the spider talk is suppressed but with high efficiency (light cone speakers) the cone material is light and thin and any spider talk just shouts right through.
While we are here a layer of Dynamat on the stamped steel basket will also help suppress basket ringing. Again most folks figure this is not necessary but I can assure you that once you try it you will hear easily the difference of with and with out. If you have a bass cabinet which is not braced in any way these mods will likely be lost on you for the most part as the box talk will drown out the spider talk and basket ringing.
These are easy simple to install and inexpensive mods to do which will help to take your speaker (any speaker) to another level. Best regards Moray James.