Grado SR325e Cable Upgrade

Posted by James Crew on 31/05/2023 in Dismanteling and re building headphones, Uncategorized |

Here is how we replace the cable on a pair of Grado SR325e’s. We’d recommend giving this a go on all of the plastic and metal body Grados. It’s a shockingly easy mod and all you will need is a bit of soldering know-how.

We start with a rather sad looking pair of SR325e’s. The cable has become completely petrified and sticky and has even cracked in some parts. This is the fate of all Grados. The nameplate is also missing on one of the cups.

First, pull the pads off. This is just a tension fit and you have probably had these come off by accident at some point or another.

Lever the fork out just enough to pull the hinge pin out of the housing. Slide it upward into the groove left by the pad before repeating for the other side. Then you should be able to pull the whole fork upwards and away from the driver.

Pop both the earcups on a heat plate set to 80 Celsius. We have found that any higher warps the driver and any lower does nothing. This works best on the metal Grados as the heat conducts well to the layer of glue holding the plastic into the metal housing. On plastic Grados this often is not needed and you can just pull them apart with some mechanical advantage. Once they are on the plate, we tuck them into a bubble-wrap bed to heat up a bit faster and more evenly.

Once the drivers are roasty toasty, I take a pair of pliers and use them the wrong way to apply a spreading force in the ledge pictured. Do this little by little around the whole driver to slowly move them up. If you feel it is not moving, you may need more heat. Try to keep force to a minimum to avoid breaking the plastic lip at the top.

Like most things, it happens not at all, then all at once.

The two parts will fully seperate and you will find a gluey mess inside.

Just for convenience, I snip the old cable around here just to get it out of the way although I will be removing it all together later. This just helps to remember the polarity of the drivers.

You want to get rid of this glue ring that was holding in the driver. The best way to do this is with some IPA isopropyl alcohol. A dab will totally dissolve the bond and you can pull it out in one satisfying ring.

So satisfying

I made up one of our braided cables to be used as the replacement. We have a bunch of posts about how we make these in both video and blog flavour. If you are interested in doing this, you can make your own following one of these or we can sell you one. Just pop us an email. Alternatively, you can find any headphone cable that splits in two and chop the ends off. I would imagine a HD600 cable would work well for this.

I tied a knot in the cable and sat it in one of the groves in the housing. You absolutely need to ensure there is ample strain relief and the cable will not be pulling on the solder joints. A sturdy knot will work well but you can also use zip-ties or glue. If you miss this step, you will soon be furthering your DIY skills with a driver swap.

I de-soldered the old wires and soldered on the new ones. Make sure to observe the polarity of the drivers. The blue wires are negative on all Grados. I made sure to heat up the solder joint as little as possible to reduce the chance of the coil wire breaking. I have not had this happen yet but someday I will get too confident and break a pair. I also put a bit of glue on the knot to help it stay in place.

Both drivers ready for re-assembly.

When reassembling the drivers, make sure to match the cable to the cutouts on both halves. No glue is needed at this step. Just push the two halves together.

You should have about 1 Cm of room all the way around. This will leave enough space for the cable and is how they are spaced from the factory.

I use a ruler to make sure both drivers are eavenly spaced and parallel.

I use a hot glue gun to run a bead around the lip of the intersection here. This way holds together nicely and makes the headphones easier to service in the future for cleaning out dust and future cable replacements. You can use the IPA trick again and have them open in moments. This seam is also hidden by the pads so the headphones look no different.

Pretty happy with this one. The nozzle of the glue gun can be used to push the glue into the crevice whilst also forming a nice filleted transition. The trick is starting with your hand in a position to do the whole circle in one go. That and flow consistency. Ultimately, as it cannot be seen, this barely matters.

Assembly is the reverse of disassembly. Before you put the cups back into the fork, check your left and right. I use this video: 

Put the cups into the corresponding forks and get the pads back on.

We are missing a name plate on this pair. No luck from Grado but nothing a 3D printer cant fix.

We got cheeky and whipped up one with a Custom Cans logo. Jason highlighted it with a sharpie and it looks a bit better than before.

We might not have bothered but this plate does actually have an effect on the sound. Its better to have the channels matching after all. We even did a better job of getting it in the middle than Grado.

Jason had a go at reviving some of the faded silver lettering with the sharpie but the effect was more miss than hit. Still far better than nothing and takes about 50k miles off this pair.

With that we are done. This mod is very easy and should honestly be attempted by anyone with a little bit of soldering experience. If your headphones are broken then its a no brainer. The Grado cable is notoriously awful and literally petrifies itself over time. The new soft, flexible cable is lighter, less microphonic, more durable and looks better. Give it a go. Or just send them to us and we will do it for you 🙂

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