The "Fantoms" featured a flanged, metal collar under the head, which gave the drums a unique sound. You could purchase them as either the 6", 8" and 10" "Tri-Fantoms", or a dual set of Fantoms with 12" and 14" drums. Later models even had removable plugs in the bottom bowl section to alter the sound. In the Trilok's case, he used condenser microphones, mixed with EQ, a dash of reverb, and along with his inimitable talent, produced some of the greatest sounds ever heard from those Fantoms.
At long last, I was able to purchase one of those extremely rare drums on eBay in the UK. After the Fantoms arrived, I stripped and cleaned it; Safely peeled off the original badge; Sanded it; Painted it, and added all new Remo Colortone Emperor heads. Additionally, I brought out my customized, chrome-wrapped, 12" x 5" Pearl "Firecraker" snare, the same snare I used with my original subsonic kit.
Pearl makes a 14" version which is difficult to find without buying it as an add-on with a 10" tom. Thanks once again to Thomann in Germany, I was able to get one. The Travlers come with black hoops, however I replaced it with a triple flanged, chrome, 8 lug hoop to match the rest of the kit.
Update: I just finished adding mics to the entire kit and just as Trilok's drum tech revealed, you have to tune the heads totally slack, with only enough tension to keep the washers tight; They sound horrible, BUT, once I added the bass mics, turned up the bass EQ, turned down the mid and high EQ, and threw a little reverb on it, I was able to get that Trilok sound!
And here's a little video of the Indian Subsonic Bass Sound Kit in action...