Sennheiser HD280 Pro jack mod
Aug 3, 2019 at 12:27 AM Post #33 of 45
I created an account just to thank you for this thread, and to give you and future readers a heads-up about a jack even more ideally suited for this mod.

So, early last week while I was mowing the lawn, I got the idea to see if modding a headphone jack into my HD-280s was a possibility; I'd forgotten to charge my Bluetooth earbuds, forcing me to use my HD-280s if I wanted music while I was mowing, and the cable kept getting caught on the mower handle and pulling itself out of my phone. After I got done, I did some googling and stumbled across this thread. When I looked on Amazon to see if I could find the jack you used, I didn't have any luck, but I did find this Philmore panel-mount jack that I ended up using.

The body of the jack is cylindrical and 5/16" in diameter, so it fits perfectly in the hole for the original cable and doesn't require removing any plastic. It also has a nut on it that's just thin enough that it can be wedged securely between the outer cable hole and the bit that normally holds that rubber block at the end of the cable. Then, all you have to do is insert the rest of the jack and tighten it, solder your wires, and reassemble. No muss, no fuss, and no need to glue/epoxy anything, though you do still need to remove the circuit board. Here's how it looks on my HD-280s; I think that plastic flange around the outside of the jack makes it look even more like it came stock like that.

Now I just need to get a good Bluetooth adapter (I've got my eye on the FiiO BTR1K), a male-to-male adapter and a right-angle adapter—unless there's such a thing as a male-to-male right-angle adapter, which I can't find for the life of me—and I'll be all set to mow the lawn without any cables getting in my way.

If you're wondering why I didn't put the ear cushions back on before taking the photo, they were the original cushions that came with my cans when I got them ten years ago, and despite being as gentle as I could they pretty much disintegrated when I pulled them off.

Also, I don't know if you ran into this during your mod, but when I soldered the wires so the copper ones were both on the neutral terminal and the red ones were on their corresponding live terminals, one of the drivers was out of phase so I had to re-solder one set of wires so the red was connected to neutral and the copper was connected to live. Makes no sense whatsoever given the wiring layout of the original cable and circuit board, but at least everything sounds right.
 
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Jul 28, 2020 at 12:00 PM Post #34 of 45
I found the threads on here about the HD280 "blue tak" mod helpful in taking apart my set to add a jack so I thought I reciprocate and post a thread showing how I added a jack to replace the built-in cord.

Update: Executor32 found a really nice headphone jack on Amazon, I've quoted his post here so you can all see it sooner.


I have had my 280's for a few weeks now and love 'em. They block out lots of noise and don't hurt they way the RS 120's did (because the don't sit ON my ears). However I didn't like the coiled cord that came with them. My full intention is to use the RS 120 guts to make the 280's wireless but that will be for another time. In the mean time I wanted to remove the coiled cord and make it possible to use any cord. I've seen mods where all but a few inches of the cord are removed and a male jack is added. This means you can use whatever extension cord you have but they are removable. I didn't like this because it's not very clean and because of my final goal of making them wireless. So without further ado here are the pic's of my conversion.

1. There are lots of thread about how to take these apart so I'll skip that step. Here is the left shell with the cover in place. This is the part that we'll need to modify.


2. The panel removed.


3. This is the jack we'll be transplanting into the headphones. It's a radio shack part, nothing special. After opening the set I discovered that it's almost like this was intended. With only a little plastic removal I was able to get a perfect fit. I only thought to take pictures after I made the cuts so I have no before pictures. The bit I removed looked just like the U shaped part you see here.


4. A test fit. This is too good to be true.


5. Here is another shot from the top of the test fit.


6. There is a little bit of plastic that needs to be removed from the underside of the cover as well but it's easy to do. I recommend scoring it with an x-acto knife and then using a pliers to break it off. It makes a very clean cut that way.


7. I used the x-acto knife to crosshatch the jack so the epoxy would have more to grab onto. Here you can see the epoxy.


8. All back together. You'd never know that it wasn't stock.


Thanks for reading. Hope I've inspired you to do your own mod.
-Trevor
I found the threads on here about the HD280 "blue tak" mod helpful in taking apart my set to add a jack so I thought I reciprocate and post a thread showing how I added a jack to replace the built-in cord.

Update: Executor32 found a really nice headphone jack on Amazon, I've quoted his post here so you can all see it sooner.


I have had my 280's for a few weeks now and love 'em. They block out lots of noise and don't hurt they way the RS 120's did (because the don't sit ON my ears). However I didn't like the coiled cord that came with them. My full intention is to use the RS 120 guts to make the 280's wireless but that will be for another time. In the mean time I wanted to remove the coiled cord and make it possible to use any cord. I've seen mods where all but a few inches of the cord are removed and a male jack is added. This means you can use whatever extension cord you have but they are removable. I didn't like this because it's not very clean and because of my final goal of making them wireless. So without further ado here are the pic's of my conversion.

1. There are lots of thread about how to take these apart so I'll skip that step. Here is the left shell with the cover in place. This is the part that we'll need to modify.


2. The panel removed.


3. This is the jack we'll be transplanting into the headphones. It's a radio shack part, nothing special. After opening the set I discovered that it's almost like this was intended. With only a little plastic removal I was able to get a perfect fit. I only thought to take pictures after I made the cuts so I have no before pictures. The bit I removed looked just like the U shaped part you see here.


4. A test fit. This is too good to be true.


5. Here is another shot from the top of the test fit.


6. There is a little bit of plastic that needs to be removed from the underside of the cover as well but it's easy to do. I recommend scoring it with an x-acto knife and then using a pliers to break it off. It makes a very clean cut that way.


7. I used the x-acto knife to crosshatch the jack so the epoxy would have more to grab onto. Here you can see the epoxy.


8. All back together. You'd never know that it wasn't stock.


Thanks for reading. Hope I've inspired you to do your own mod.
-Trevor
Hi

This seems to be what I'm looking for for my 280s but for some reason the pics in your post aren't appearing anymore (on phone or laptop). Is it just me? Any chance you could repost the images?
 
Jul 28, 2020 at 3:52 PM Post #35 of 45
Hi

This seems to be what I'm looking for for my 280s but for some reason the pics in your post aren't appearing anymore (on phone or laptop). Is it just me? Any chance you could repost the images?

Looks like they did some sort of image moving and my post didn't get automatically upgraded. Thanks, I've updated the post to point to the images again.
 
Jan 21, 2021 at 8:18 PM Post #37 of 45
P1050234@0,25x.png


P1050233@0,25x.png


Joining the 280 Pro Cable Mod Club :)

Feels a lot better with a custom cable, all the weight pulling them down is gone. There's still some microphonics though and I'm gonna try and put some rubber around the connector to see if I can dampen it.

Damn I'm surprised at how much I enjoy these headphones.
 
Jan 22, 2021 at 2:14 AM Post #38 of 45
Joining the 280 Pro Cable Mod Club :)

Feels a lot better with a custom cable, all the weight pulling them down is gone. There's still some microphonics though and I'm gonna try and put some rubber around the connector to see if I can dampen it.

Damn I'm surprised at how much I enjoy these headphones.

Very clean! Well done.

I also had that issue. I used a braided cable (which was great for preventing snags) but when it rubbed on the edge of the table it would send that vibration straight into the headphones. I wonder if getting a short extension cable would work to absorb some of that...

Something like this:
3-5mm-18-stereo-audio-aux-headphone-cable-extension-cord-male-to-female-6-inches_NID0013230_700.jpeg


https://www.cmple.com/3-5mm-stereo-audio-headphones-mini-plug-extension-cable-6-inches
 
Jan 22, 2021 at 8:13 PM Post #39 of 45
Very clean! Well done.

I also had that issue. I used a braided cable (which was great for preventing snags) but when it rubbed on the edge of the table it would send that vibration straight into the headphones. I wonder if getting a short extension cable would work to absorb some of that...

Something like this:
3-5mm-18-stereo-audio-aux-headphone-cable-extension-cord-male-to-female-6-inches_NID0013230_700.jpeg

https://www.cmple.com/3-5mm-stereo-audio-headphones-mini-plug-extension-cable-6-inches

Yea, I'm also using braided cable. I'll do some experiments and check back here if I get any wiser :)
 
May 20, 2021 at 4:17 PM Post #40 of 45
Well..

I'm not a professional whatsoever but i did it! this is my first headphone mod ever.. i'm gonna use a short cable with my vr headset

i'm happy with the results! everything is working so i'm proud of it :D

Loving this detachable mod so far! i used silicone for isolate the soldering and 10 min resin for the jack.. tested it and everything, that's not coming loose soon lol


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Apr 22, 2024 at 6:33 PM Post #41 of 45
Hi,

I know this is an old thread now, but can anyone confirm the polarity of the wiring from the drivers?

I did the mod by removing the circuit board and tying the two copper wires together, and then to the sleeve part of the 1/8 jack, and the reddish/copper wires to the tip and ring.

I am wondering if that could be reversed polarity as the sound seems different. Left and right balance is fine, just seems to have less bass and clarity.

Jon
 
Apr 23, 2024 at 9:28 AM Post #42 of 45
Hi,

I know this is an old thread now, but can anyone confirm the polarity of the wiring from the drivers?

I did the mod by removing the circuit board and tying the two copper wires together, and then to the sleeve part of the 1/8 jack, and the reddish/copper wires to the tip and ring.

I am wondering if that could be reversed polarity as the sound seems different. Left and right balance is fine, just seems to have less bass and clarity.

Jon
I mentioned this in my own comment further up the page. When I wired it up as you described, which is what it seemed to be correct according to the wiring of the original cable and that little circuit board it connects to, one of the drivers was out of phase with the other and it sounded exactly like you described. I had to swap the polarity on one of the drivers (i.e. its reddish wire tied to the other driver's bare copper wire, and its own bare copper wire tied to the tip/ring) to fix it.
 
Apr 23, 2024 at 3:36 PM Post #43 of 45
I mentioned this in my own comment further up the page. When I wired it up as you described, which is what it seemed to be correct according to the wiring of the original cable and that little circuit board it connects to, one of the drivers was out of phase with the other and it sounded exactly like you described. I had to swap the polarity on one of the drivers (i.e. its reddish wire tied to the other driver's bare copper wire, and its own bare copper wire tied to the tip/ring) to fix it.
Thanks Executor32 I did read your post and it made me think I probably had the same issue. Do you remember which side of yours was out of phase? For mine I believe it is the left side. It is hard to believe they would be so silly as to wire them differently on each side.
 
Apr 23, 2024 at 3:57 PM Post #44 of 45
Thanks Executor32 I did read your post and it made me think I probably had the same issue. Do you remember which side of yours was out of phase? For mine I believe it is the left side. It is hard to believe they would be so silly as to wire them differently on each side.
It doesn't really matter which one you reverse the polarity on since they're both out of phase in relation to the other; reversing the polarity on either one will bring them back in phase and everything will sound normal, even if both may end up technically being wired "backwards".
 
Apr 25, 2024 at 7:32 PM Post #45 of 45
It doesn't really matter which one you reverse the polarity on since they're both out of phase in relation to the other; reversing the polarity on either one will bring them back in phase and everything will sound normal, even if both may end up technically being wired "backwards".
On my headphones I notice the left side seemed weaker and had a slight crackle at low frequencies. So I reversed the polarity on that side and I am back to thumpy goodness.

So for me the right side is purely copper colored to sleeve and reddish copper to ring, and the left is purely copper to tip and reddish copper to sleeve, the reverse of the right.
 

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