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Eggo mods without isolation/sound degradation

post #1 of 9
Thread Starter 
I'm looking to mod my D66s to sound a bit better, particularly in regards to the bass, which is good but could be better (particularly since I never EQ). What I'm looking for is a mod which doesn't make the sound quality any worse and keeps the cans' minor isolation and reduced leakage. Thus I think that the bass mod where you put a hole in the side caps is out of the question (unless this doesn't make much of a difference?)

I'm particularly interested in a mod that BowerR64 mentioned in his thread for increasing the bass in which the piece of foam inside is removed. This one seemed to be forgotten after that by everyone in favor of the hole mod. How does this one sound? Any others people here recommend? I'm a complete newbie to modding equipment so if anyone wants to give some more detailed instructions than the ones posted in other threads I'd be very grateful.
post #2 of 9
I believe when Bower removed the foam, he then did the hole mod once he found out what was under the foam. I have done the hole mod, and I don't think it affects leakage much, and it definitely helps out the bass. I would suggest doing it by taking off the silver circle on the outside of the headphones, and using a soldering iron to melt a pea sized hole.
post #3 of 9
Thread Starter 
Cool, thanks for the reply. I actually just read your review thread as it didn't come up when I searched for mods and the instructions that you give are really quite helpful. I have some questions for you or anyone else though:

First, just how much does the bass open up? Although I think the eggos could use more bass I don't want the bass to in any way, shape, or form overpower the rest of the sound. I'm not much of a bass head; something PX100 like is as much as I want, not PortaPro like. Also, you said the leakage is only slightly affected. Do you think you could possibly illustrate how much that would be? I'd like it to be good enough so that people sitting near me in the car can't exactly hear what I'm listening to and that the noise of highway travel is somewhat blocked off, both of which the eggos do well. Although this might be a stupid question, if the leakage is greater is the isolation less as well? I notice that all leakage from the eggos comes from that vent, so I'm just a bit worried about placing a hole under there that it will just add to it.

I just want to make sure that if I mod the eggos I won't regret it, since I can't really afford to buy that many headphones, a point that makes me cautious but at the same time makes me want to mod them to better the sound.
post #4 of 9
After doing the mod the bass will NOT overpower the rest of the sound. I did the mod before the headphones were probably done burning in, so I can tell exactly how much it affected the bass, but I like them MUCH better now than before. They sound great on rock and I have been listening to some classical and they sound great there too. I also like to listen to a lot of rap, and I think that the bass may still be a little lacking for this, but it is definitely not overpowering. It is still very tight and controlled.

There is really now way that I can tell how much leakage was affected by doing the mod. I do not think it was changed much at all. The isolation seems to also be the same or very close to it. You said you thought the leakage came from the air vent, and I assome you mean the silver circle. There should be no extra leakage coming out of there, because inside that circle there is a plastic membrane that keeps the headphones totally sealed. Opening this membrane allows air to flow into the back of the driver, but since the sound is directed in the opposite direction it will not leak significantly more.

If you do this mod, and decide you don't like it, you can always cover the hole you made with some kind of tape. Since the hole is not actually in the direct line the sound takes from the driver to your ear, the tape will not affect the sound quality. The only thing that will matter is that air no longer can get in, thus returning your headphones to their stock sound signature.
post #5 of 9
Thread Starter 
Alright, thanks a lot for the help! I'll try the mod later today and post the results here.
post #6 of 9
I think these headphones were designed to have some leakage. If you think about it they are sealed when the membrane is stock but its so thin it will allow some sounds in but it keeps it sealed.

If you want them to be a little more closed for noise you could open the cup and put some tape or somthing over the round section.

On the outside the vent has a little button you pop off, on the inside there is a 1" round section, this section has a white filter on it. If you covered this white filter with tape then use a hole punch in the center where you put the hole for the membrane part it would block more sound but still let the air from the back of the driver vent out.
post #7 of 9
Quote:
Originally Posted by Kurashima
I'm looking to mod my D66s to sound a bit better, particularly in regards to the bass, which is good but could be better (particularly since I never EQ). What I'm looking for is a mod which doesn't make the sound quality any worse and keeps the cans' minor isolation and reduced leakage. Thus I think that the bass mod where you put a hole in the side caps is out of the question (unless this doesn't make much of a difference?)

I'm particularly interested in a mod that BowerR64 mentioned in his thread for increasing the bass in which the piece of foam inside is removed. This one seemed to be forgotten after that by everyone in favor of the hole mod. How does this one sound? Any others people here recommend? I'm a complete newbie to modding equipment so if anyone wants to give some more detailed instructions than the ones posted in other threads I'd be very grateful.

HUH? You need to cover the hole, not open it! Use cotton stuffed into the chamber behind the driver.
post #8 of 9
Thread Starter 
Alright, I've completed the mod and have been listening to various music for about an hour now. All of this is based on what I remember my eggos sounding like as of yesterday as I hadn't worn them today until I did this mod. The overall results: I'm very happy with this mod! The bass on the eggos went from a level where it was clearly audible but had to be listened for to be appreciated to a level where it comes out at you but without overpowering the music. This is exactly what I like my bass to sound like: nice and tight and you can appreciate it without having to listen for it.

It sounds great on rock and pop. I listen to every kind of music though, and it sounds good on all of them including classical and jazz. It adapts to the mix very nicely: there's lots of bass when there needs to be and just enough where it doesn't. In terms of loudness compared to the rest of the mix, it seems just a tiny bit less than that of the PX100. Of course the eggos still don't have any thump to them like the aforementioned cans do, but I think they have a great balance now. I also want to add, and I very well may be imagining this, but the highs seem to be a bit less harsh then they were before doing this. Either way, the difference isn't very great, and if there is one, it's to the better.

The mod was very simple to do. About the only thing that took me any effort at all was to put the silver caps back on, accomplished by putting in one tab at a time, and squeezing them slightly inward. The hole that I made was a bit smaller than pea-sized, going by memory roughly 3 mm in diameter. The leakage seems to be a bit greater, I'd guess about 15-20% more, which really isn't very much considering what it was before. I never really thought the eggos were too great at preventing leakage when listened to from the side of the person wearing them and this doesn't make them much worse. I'm not sure how good a test of isolation this is, but they sound exactly as loud my music player as they sounded yesterday - that is, at the same volume.

I have to say doing this mod is very much worth it and makes for a more enjoyable listen (I don't know about balanced or neutral, but I like the bass coming out like it is right now more so than being in the background). Thanks to everyone for the advice. So yeah, my eggos just got that much better. These are definitely my favourite headphones now and easily beat out other portables like the PX100 and PortaPros in terms of sound quality IMO. Now I just have to retrain my ears to not listen for the bass so much!

Bower: That's an interesting idea for gaining more isolation. I don't really feel like taking them apart and trying it though until I really need to, or someone else does first.

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[edit for anyone going back to this thread for bass mod info]

First of all, I've increased the hole from several millimeters to about the size of a pea, same as everyone else (still not big enough to fit a pencil through as some people say.) This gives you a bit more bass than the original mod I did though not nearly as big a change as the original one was from stock.

The big thing that I did afterward was the cotton mod in addition to this hole mod. I opened up the cups by unscrewing the two screws under the padding (you don't need to take it off to do this) and putting two stretched out cotton balls in each cup so that the whole surface is covered. The result? While the hole mod increases the volume of the bass, this gives it a bit of a thump similar - though not quite on the same level - as my PX100s as well as increasing the isolation a fair bit (more so than stock IMO) so it's win-win, especially for those who don't want to solder a hole due to possible loss of isolation.

I'm now of the opinion that these two mods in conjunction with each other will allow you to harness the bass of the eggos to the point where one cannot complain about the lack of bass in any way. I think the cotton mod may make it slightly less tight although I'm not completely sure, but it's just a matter of whether you prefer the ultimate tightness of the bass or want it to have a bit of a thump. I think they groove a lot better now and while before doing this mod I was leaning toward using the PX100 for their groove, I'm not looking back anymore.

I've also tried doing the tissue mod where quarter sized pieces of tissue as put in front of the drivers. I don't recommend this mod as I think it makes them a bit too muddy even with just one layer, but some might like this warmer sound so give it a try if you want to. I think burn in is all that's needed to tame the highs.

[edit 2] Okay, this edit is way later, but not too long after the above, I took the cotton balls out. They actually really muddy up the sound. If you want to give it a try after the hole mod though, go right ahead, since it's hard to screw anything up and it's easily reversible (the only thing you really have to do is get the screws out and back in, and I think everyone can do that )
post #9 of 9
Kurashima - Congratulations on the successful mod. I am glad that you are happy with the results. I find these headphones very enjoyable to listen to.

Mike Scarpitti - I have read about this mod, and I do not see why/how it works. There doesn't seem to be any reason that allowing less are in/out of the driver housing would increase the frequency response at any level (bass/mids/treble). It seems that the only thing this mod could do is 'tighten' the bass. Something that generally lessens the bass output, and is not needed as these headphones have very tight bass to begin with. This mod could also be just for dampening, which would probably smooth out the highs, and possibly make you think there is more bass, just because of the more even sound.

BowerR64 - I don't understand how adding something thicker behind the membrane (which was just opened), and then opening this new blockage would increase isolation/decrease leakage in any way. It seems that, if anything, this mod would provide an even easier path for the sound to flow out of the headphone.

I don't really see any way to do a bass increasing mod (make the headphones more open), without losing some isolation, and increasing leakage slightly.
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