Originally Posted by nmharleyrider
I am with you on the love for a good subwoofer. I am still using Bob Carver's Sunfire Woofer which somehow puts out 2700 watts in a 12"X12"enclosure. I have not heard any subwoofer put out such solid bass; I am not into the booming bass stuff. I can feel it through my concrete floors and it's a wonder it does not push the nails out of the wall board.
In October 96, I was literally on my way to buy one of the 12 inch Velodyne Servos. I was living/working in Silicon Valley, only a short distance from Velodyne's headquarters, when I stumbled across an article in the Sept/Oct "Sensible Sound" - "First Test of the Astonishing Subwoofer from Sunfire" by Joseph Cerniac. I've always been impressed by fellow physicist Bob Carver's sometimes weird but successful off-the-rails ideas. He and I both encountered serious problems with a Class G design. He successfully resurrected his and mine, an MRI Gradient Coil Driver, was killed. I was redeemed 2 years later when I assembled the world's first Class D Gradient Driver with servo modules designed by professional audiophile Dick Burwen. Most of the audio community is unaware that Dick has designed and built some amazing high power Class G servo systems. Dick and Bob Carver need to pool their talents. Maybe a jackhammer-powered Super-Duper-Sub-Subwoofer?
To get back on track, I did buy the Sunfire True Subwoofer, and once the warranty expired, I successfully squeezed more dBs for my 16 Hz organ music by adding several ounces of extra weight to the drone. The unit blew up a few years later and, true to its offer to fix it for $250, Sunfire replaced virtually every semiconductor in the output stage and never commented on the extra drone weights.
They also fixed a bug in the Auto-turn-on, which I eventually had to hard-wire permanently ON 4 years ago.
I recently purchased a 2016 SUV with a wimpy JBL subwoofer. Poops out below 35 Hz. I bought a shallow 36 x 18 x 5 inch, 1.1 cubic foot sealed enclosure that barely fits under the tonneau cover, behind the rear passenger seats. I've been unsuccessful so far, in the choice of a shallow 12 inch driver and 600W Class D Amplifier. After dozens of pages of Thiele-Small Equations and a week on the internet, I almost gave up and bought an Infinity Basslink 10 inch servo driver-and-drone. YouTube subwoofer videos are all about cave men overdriving and smoking their subwoofers. Can you imagine connecting a subwoofer to a 120VAC outlet and watching it burn as it jumps across the room?
But, lurking in the back of my feeble brain is the idea that I can still buy a used Sunfire and power it from one of my several 800W, 12 VDC-to-120 VAC Inverters, if I dare test my own with an Inverter. Another major issue is securing the Sunfire in a major collision, when it becomes a deadly missile. If the Sunfire works, it would be a great addition to Mobile True Bass Audiophile lore.
My mistake. Dick's high power servo designs were Class D, not G.