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The doped Kevlar drivers will probably be the only way to a truly satisfying sound with these. Some modification will be needed however as they are slightly smaller than the original ones. That was one of the reasons I was trying to persevere with these aluminium ones. Time to get the chainsaw out ?
All part of the journey.
Swapped them for chp80s instead and added a tweeter with cap and the speakers were ok. Perfectly nice, just didnt do anything for me so they went to the tip
BTE designs type 1 mk2 passive pre, PASS F5 dual mono, modified Philips cd371, Metronome 'M' speakers, BTE designs balanced power supply, Benedict Audio hothead (mm) musical fidelity x-lps (mc) mac mini + beresford tc7510
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He was confirming what Stu has found as far as I can see...Dr Bunsen Honeydew wrote: ↑Thu Mar 08, 2018 2:22 pmSo a famous *speaker designer* is at odds with what Stu hears - I know which one I trust. I have met too many speaker designers who are complete arses to fall for that. All they are interested in is keeping their jobs, they spend more time trying to bullshit the bosses than bullshitting us - same mad corrupt industry as always.
Doping paper, plastic or Kevlar woven ones primarily, he agreed wholeheartedly with your findings and listening on cones made of conventional materials, so no challenge whatsoever! We were talking metal cones specifically and how much more difficult they are because of their different characteristics making them more difficult to deal with, that's all. I was responding to Stu's comments and his findings and thought the info might be useful. Apologies Stu if it wasn't.
To recap what i have done;
1) removed wadding
2) removed some internal wood with a chainsaw
3) stuck lots of 7mm and 8mm steel inside
4) blocked the port
5) changed 3.3uf electro cap for a russian pio
6) doped the inside of the tweeter's dome with plastidip
7) doped the exterior of the mid bass with plastidip
8) soldered the internal wiring to the drivers
9) sealed all joints
So i will mount the crossover components (1 inductor & 1 capacitor) on the back of the speaker externally as i dont want to lose anymore internal volume - the russian pio is massive. Its a shame that the bison kit did not work. I had to add more and more and more and the thing ended up lifeless and dull. After removing the bison kit (soaked in paint thinners) i sprayed the mid bass with plastidip just to see what that did. It was not too bad but the mid range was still over powering. Fun to listen to for a while but annoying in the long term.
At least i have LOADS of steel in there, removed wadding and blocked the port. Learned a few things and i am very satisfied with how much they weigh (extremely heavy for a small stand mount). Maybe in the future i will swap the mid bass out for a doped kevlar but don't hold your breathe. Too many other things to faff about with.