MovingIron
New Head-Fier
Hello! First post on the forums.
I am puzzled by the wiring for old Dymac monopole magnetic headphones. I have two pairs- a Type E which work great and I won't dissect, and a Type F which were fairly lousy and I didn't mind taking a look at the voice coils (they are identical, but are simply rotated 180 degrees in respect to each other (the writing on the opposite side of each phone gives it an "up" and "down" orientation).
The coils are both wound in the same direction, and the permanent magnets are identical in both headphones. I thought I was right in assuming the direction of current flow should be identical in both headphones for them to be in phase. But in fact, they sound terrible when wired this way. When I wire one headphone so the current flow is reversed, however, they sound great.
Here's a link to some images explaining the headphones.
Dymac Headphone Images
So I'm stumped. I can only think that maybe the Type E's had one coil wound oppositely to the other, unlike the Type F. In all other respects of wiring and permanent magnet polarity, they are identical.
I am puzzled by the wiring for old Dymac monopole magnetic headphones. I have two pairs- a Type E which work great and I won't dissect, and a Type F which were fairly lousy and I didn't mind taking a look at the voice coils (they are identical, but are simply rotated 180 degrees in respect to each other (the writing on the opposite side of each phone gives it an "up" and "down" orientation).
The coils are both wound in the same direction, and the permanent magnets are identical in both headphones. I thought I was right in assuming the direction of current flow should be identical in both headphones for them to be in phase. But in fact, they sound terrible when wired this way. When I wire one headphone so the current flow is reversed, however, they sound great.
Here's a link to some images explaining the headphones.
Dymac Headphone Images
So I'm stumped. I can only think that maybe the Type E's had one coil wound oppositely to the other, unlike the Type F. In all other respects of wiring and permanent magnet polarity, they are identical.
