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In Reply to: RE: Maximizing Magnet Efficiency of Coil Speakers and Toroidal Transformers posted by alan m. kafton on July 16, 2018 at 00:51:26
Alan,
Yes. LessEMF know their materials (but not their audio impact) and claim to have a superior quality of UltraPerm 80 coming in September that beats the 3M version sold on eBay so it's probably worth waiting for that. I cut the material into long 20mm wide strips that I bend over width-wise so that I have long segments with a trench of two 10mm wide sides along which I lay the ground wire and seal it closed with white tape.
The distortion attributable to magnetic stainess-steel screws in the amplifier and speakers bury the outside edge of each note's definition with raspy, tiring, unsubtle noise whereas this source of distortion subtly sabotages the whole tonal purity of each musical note.
DG
Follow Ups:
Very intriguing....is the UltraPerm malleable enough to conform to bends or arcs in the ground wire? Not every wire installation is a straight one. If you had a pic of your installation, that would be wonderful as well.
Alan,
I simply cut lengths of UltraPerm slightly longer than the straight run of each part of the ground wire to allow for corners. The UltraPerm 80 can be folded over once to create a trench but that's it! So it's an imperfect world but the payoff in tone makes messing around all worth it.
Here's a picture from 2014 after which I improved the UltraPerm installation and added many tweaks. Regrettably just messed up my amplifier following my first major re-installation mistake (due to haste in a local professional's store where a loose connection had been resoddered after disassembly). So have again been removing all tweaks prior to shipping it back to the manufacturer who finds them offensive and I cannot now take a more recent shot.
DG
Thank you for this....much clearer now.
DG:
You mention using the shielding material on speaker drivers. Do you create a wrap around the rear magnet and back? Also, how do you wrap crossover coils; around the perimeter and top/bottom, or other?
Thanks!
DRS
FastCat,
Make sure to note the correct color terminal connection before removing each speaker so you'll reinstall them correctly as there's no indicator with mine.
To minimize speaker reflections, it's best to start by sticking self-adhesive felt around the back (leaving that hole in the center unobstructed) and sides of each speaker first leaving an anchor point for duct tape on one side with which to attach the start of the MagnetShield. From my experience I suggest being conservative and allowing four or five thicknesses of MagnetShield when estimating the length of the correct width to be cut. (You'll need scissors with serrated edges for this and I bought mine from eBay - watch your fingers for nicks/ cuts from the sharp MagnetShield edges.) Then anchor one MS end to the bared spot on the speaker side with duct-tape, and tighten the full length of MS thicknesses to the max before securing the other end down with duct-tape.
Cut MS circles matching the speaker back with a sufficiently large aligned hole in the middle of each to prevent any speaker air obstruction and duct-tape the outside of these MS circles into a wafer of four or five. Then install the MS wafer into position against the back-felt by duct-taping it to the already installed sides so that there is little potential for vibration. Cover any exposed MS with duct tape.
The cross-over coils are, of course, very much smaller so forget the felt but the principles and size constraints are exactly the same. Everything, whether speaker or cross-over, has to fit back through the tight cabinet openings.
Good luck - shall be interested to hear how well it works out for you. The increase in amplification and its benefits took me aback both times. Had I gone straight to the magnet efficiency of three bare MS thicknesses without an intermediate stop-over in cork-spacing, I would likely have described the improvement as jaw-dropping. Have now received the additional MS to increase the thickness level to five although sadly I don't know when I shall be able to test the result with a broken amplifier that has to be shipped overseas for repair by the manufacturer.
DG
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