I was working on a new Paul’s Post that’ll appear in a couple of days and it occurred to me sometimes the forums and my posts are very different audiences and I should be sharing with both.
(It sometimes takes me a long while to figure simple things out)
Enclosed are three photos of the new custom-designed woofer Chris created. The idea behind the woofer is to make sure we never run out of linear excursion for any demand placed on it by the internal 700-watt power amplifier. As you can imagine, a 700-watt amp pushed to its limits can move one hell of a lot of cone and shake a room to its foundations.
So, for those of you with interest in such things take a look at the photos. What you’re seeing is a massive 12" woofer with a linear excursion (Xmax) of 28mm in each direction! Wow, that’s more than double the best we have ever seen in a linear, low distortion woofer.
To make that happen Chris designed, and then we tooled a custom progressive spider and suspension system. (The spider is the soft folded fabric at the end of the cone separating the voice coil from the woofer cone). Add to that a soft inverted surround, a low mass cone, and a 3" aluminum voice coil that’s 2.5" long and you start to see how this stacks up as being the low distortion linear monster I have been jumping up and down about.
One of the challenges of any driver is keeping its range of motion linear and low distortion. On something this big and powerful, that’s really quite a challenge. To handle that requirement Chris did a ton of FEA (Finite Element Analysis) and the results of that linearized the magnet’s BL vs. excursion by shaping the pole piece and linearizing the inductance through the use of multiple Faraday rings.
And speaking of magnets, check out the massive 3-stack of 8" Y35 ceramic magnets supporting a direct gap venting system on the rear of the woofer (air-cooled through the vents).
If it isn’t obvious, I am totally stoked about this woofer and can’t wait to get it into the cabinet and start the testing.
Ohn and I forgot to mention. He’s also designed an entirely new servo system based on advanced DSP technology that works and sounds better than any accelerometer-based system.
Bass lovers of the world, unite!