"Patrick" wrote in message
...
I have some vinatge headphones (Sennheiser HD424) and want to attach a new
plug.

Which color wires are the positive ones?

The colors in one of the leads are red & blue and in the other lead black &
yellow. (No wire is used as screening - there's just two wires in each
lead.)

Wire them up to a mono source and insert a dpdt switch so you can
easily and quickly reverse the phase of one earpiece. Insert a PVC
T coupling between the earpieces. Compare the sound levels coming
from the bottom of the T while flipping the switch. Loudest is in phase.
Art

Artemus wrote:

"Patrick" wrote in message
...

I have some vinatge headphones (Sennheiser HD424) and want to attach a new
plug.

Which color wires are the positive ones?

The colors in one of the leads are red & blue and in the other lead black &
yellow. (No wire is used as screening - there's just two wires in each
lead.)


Wire them up to a mono source and insert a dpdt switch so you can
easily and quickly reverse the phase of one earpiece. Insert a PVC
T coupling between the earpieces. Compare the sound levels coming
from the bottom of the T while flipping the switch. Loudest is in phase.
Art


But!, Are the ears in phase? :~j

Jamie

"Tim Wescott"

"If the click seems to come from right inside your head - game over".

What more do you need? Phil's given you a test to see if the phasing is
correct, can you not figure it out, or what to do if the click seems to
come from your right or your left?


** If both ear phones work but are wired out of phase, the AA cell click
test produces a sound that seems to be originating outside the head on both
sides. Mono speech or music sounds much the same.

The effect is far MORE pronounced than with typical stereo speakers in a
room.

The OP demonstrates his a monumental ignorance of headphones, hi-fi sound,
usenet etiquette and common sense.


..... Phil

"Meat Plow"


** This trolling asshole is a narcissistic psychopath.

He knows nothing and understands even less.

I want the lunatic jerk kicked right off usenet.

Who will help me ?




..... Phil

"David Looser"
Some damn idiot wrote:

It's been instructive to see how many people misunderstood what the
original question was trying to solve and they gave obviously useless, if
not misleading, advice. It's never been the same since Eternal
September.

Actually that's untrue, nobody misunderstood the question or gave useless
or misleading advice. And Phil is quite right, the effect of having the
headphones out of phase with each other is not at all subtle, it is at
least as obvious as it would be with speakers. Just because there is no
phase cancellation in the air doesn't mean that the brain is not
immediately aware of the phase difference heard in the two ears.


** I have come across folk with their hi-fi speakers wired out of phase and
gone un-noticed for months or years. Room acoustics and listening position
being critical to observing the fact. However, stereo headphones wired out
of phase is just the weirdest sound and not tolerated by many for long.

Headphone listening is nothing like listening to stereo speakers or natural
sounds in the environment - the outer ears are no longer involved and moving
one's head has no effect on the sound heard. The stereo effect becomes
extreme and the "sound stage" appears to be inside one's head extending left
and right as well. Plus the who damn thing moves about with your head
movements.



..... Phil

"David Looser" wrote in message
...
"Patrick" wrote in message
...
On 13:07 14 May 2011, Dave Plowman (News) wrote:

In article ,
Patrick wrote:
I have some vinatge headphones (Sennheiser HD424) and want to attach
a new plug.

Which color wires are the positive ones?

The colors in one of the leads are red & blue and in the other lead
black & yellow. (No wire is used as screening - there's just two
wires in each lead.)

Black and blue are the commons. Not that it would make any difference
if you commoned red and yellow.

You can check for sure by unplugging the leads from each actual
earpiece (red and blue plugs), but be careful to pull on the actual
plug only. The pins are of slightly different sizes.

Hope you have a source of the muffs for these - they crumble to dust
quite quickly.

You must know the headphones well because I had long forgotten the leads
plugged into the earpieces. I didn't realize the mini plugs were keyed
to
go in only one way around. With that info I could have continuity tested
the colored leads to each of the larger pins on the plugs but you saved
me
doing that becauase you have given me the color coding too. Thank you.

You're right about the muffs crumbling. I threw them out. First I'll
see
what the cans sound like now and then decide if it's worth getting new
muffs.

It's been instructive to see how many people misunderstood what the
original question was trying to solve and they gave obviously useless, if
not misleading, advice. It's never been the same since Eternal
September.

Actually that's untrue, nobody misunderstood the question or gave useless
or misleading advice. And Phil is quite right, the effect of having the
headphones out of phase with each other is not at all subtle, it is at
least as obvious as it would be with speakers. Just because there is no
phase cancellation in the air doesn't mean that the brain is not
immediately aware of the phase difference heard in the two ears.

David.



+1

Arfa

On May 14, 7:29*am, Patrick wrote:
I have some vinatge headphones (Sennheiser HD424) and want to attach a new
plug.

Which color wires are the positive ones?

The colors in one of the leads are red & blue and in the other lead black &
yellow. *(No wire is used as screening - there's just two wires in each
lead.)

Sounds like you got your fix.
(See Usenet really is good for something...)

Still, shoulda bought a pair of AKG K240's.
.....unless you got a huge stash of 8-tracks laying about. !!

-mpm

On Sat, 14 May 2011 13:55:16 +0100, Patrick
wrote:

On 13:07 14 May 2011, Dave Plowman (News) wrote:

(snip)

Hope you have a source of the muffs for these - they crumble to dust
quite quickly.

(snip)

You're right about the muffs crumbling. I threw them out. First I'll see
what the cans sound like now and then decide if it's worth getting new
muffs.

I have Sennheiser HD414's from ~1980. In the last year the muffs have
gone from developing a lasting flat where they rest on a surface, to
literally crumbling.

Sennheiser's national distributor has replacements for $A9 plus
postage. I'm impressed.

Patrick wrote:

I have some vinatge headphones (Sennheiser HD424) and want to attach a new
plug.

Which color wires are the positive ones?

The colors in one of the leads are red & blue and in the other lead black
&
yellow. (No wire is used as screening - there's just two wires in each
lead.)

My first guess would be blue+ red- and black+ yellow-, but here's how to
find out. First hook them up, arbitrarily starting with what I said, or
the other way - it's a coin toss. Listen to something in mono. You'll
have to find your own mono source. (finding a mono source is left as an
exercise for the student.)

If the resulting sound comes from the middle of your head, you got
it right. If it sounds like two sources on either side of your head,
you've got the polarity wrong on one side or the other.

I'm getting this from remembering (I think) that in the old 4-wire
phone lines, green was tip and red was ring, and black was tip and yellow
was ring.
--- http://en.wikipedia.org/wiki/Tip_and_ring

Hope This Helps!
Rich

Patrick wrote:

Your lack of knowledge is made all the more lamentable by the unwarranted
self-assurance with which you conduct yourself.

I believe it's time for you to go **** yourself.

Thanks for playing!
Rich