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Old 8th October 2012, 01:12 PM   #1
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Default The speaker distortion trick

I wanted to share a trick / modification that can reduce distortion of any (audiophile) speaker chassis that has a (ferrite) magnet.

Speakers have two pole pieces attached to a permanent (ferrite) magnet. One is located around the voice coil (usually attached to the speaker frame) and the other is located inside the voice coil (attached to the rear side of the magnet)

These two pole pieces are usually not electrically connected (multimeter shows a few Mega Ohms resistance) and this seems to be the cause for increased (dynamic) distortion. Ferrite magnets are electrical insulators so when a speaker has one of these installed the pole pieces are not electrically connected.

The modification consists of electrically connecting both pole-pieces together using a piece of wire, clamp or foil.

One pole piece is usually connected to the metal speaker frame and to the rivet that holds the speaker connection terminals.

The other pole piece is at the rear of the speaker (round disc).

One can easily solder a wire to the rivet and clean the metal disc on the rear of the speaker (file / sandpaper) and solder the other end of the wire to the edge of this disc using suitable soldering iron / soldering tip.

In multi-way speakers one has to repeat this mod for every speaker chassis (tweeter, midrange, woofer).

The effect of this mod can be tested during listening by placing a switch in series with the wire so one can connect / disconnect both pole pieces during listening.
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Old 8th October 2012, 01:38 PM   #2
tvrgeek is offline tvrgeek  United States
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Has you done actual measurements? I have to think this is associated with eddy currents, something that are basically very bad and why copper shorting rings are added to better drivers.

Wonder why I have not seen this on $200 drivers?
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Old 8th October 2012, 03:16 PM   #3
sippy is offline sippy  United Kingdom
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As my drivers have to come out again this week, I'll give it a try along with the 'Electron Loop' used by BudP.
Though Eminence Beta 12Lta's aint 'audiophile' it might do some thing......
I shall report back with subjective impression.
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Old 8th October 2012, 03:19 PM   #4
Pano is online now Pano  United States
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The LTA is a wonderful driver. Not pretty to look at, but used right it's a real sleeper.

I'd be interested to see before and after (or shorted and non-shorted) measurements of this trick.
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Old 8th October 2012, 03:37 PM   #5
balerit is offline balerit  South Africa
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If you look at this picture:

http://www.hhelectronics.com/images/...aker-parts.jpg

are you talking about a jumper between the front plate and the yoke?

Thanx
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Old 8th October 2012, 03:54 PM   #6
sippy is offline sippy  United Kingdom
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Quote:
The LTA is a wonderful driver. Not pretty to look at, but used right it's a real sleeper.
This user whole heatedly agrees - and it's cheap / strong enough to mess about with.

balerit:
I would guess so, having just plumbers caulked this area as part of basket damping, I'm going to have to go digging to get there......*sigh
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Old 8th October 2012, 03:56 PM   #7
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Hi balerit,

Quote:
are you talking about a jumper between the front plate and the yoke?
Correct.
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Old 8th October 2012, 04:09 PM   #8
balerit is offline balerit  South Africa
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Quote:
Originally Posted by sippy View Post
This user whole heatedly agrees - and it's cheap / strong enough to mess about with.

balerit:
I would guess so, having just plumbers caulked this area as part of basket damping, I'm going to have to go digging to get there......*sigh
Have fun
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Old 8th October 2012, 04:10 PM   #9
balerit is offline balerit  South Africa
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Quote:
Originally Posted by -ecdesigns- View Post
Hi balerit,


Correct.
Thanx, I'll give it a try.

Mac

The Book Worm - DIY Audio Ebooks and Manuals - Speakers, Moscode Amplifiers, Electronics, Map Reading, Free Capacitor Intro.
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Old 8th October 2012, 04:14 PM   #10
sippy is offline sippy  United Kingdom
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Have fun
I am, huge EmKen shaped fun
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