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Post by goldenboy on Mar 3, 2014 22:48:22 GMT
Hi Solderdude, would you be able to do some FR test again without the paper felt if you have some time? I'd like to confirm my conclusion that the low frequency had been lighter and if that was a good and easy mod for us who cannot do a filter mod. I'm curious if that has a big effect in SQ and if the FR will be more favorable. Thanks.
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solderdude
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Post by solderdude on Mar 4, 2014 9:56:08 GMT
I might be able to do so but can only do so on a modified headphone. It will show what it does though. The paper filters are present in the original HD681 Superlux models as well.
Can't tell when I have time for this though..
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Post by goldenboy on Mar 4, 2014 17:06:43 GMT
It's alright. Kindly update us when you have time. Thanks.
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Post by solderdude on Mar 5, 2014 13:02:07 GMT
Measurements done. removal of the dark paper filter that is situated between the rear of the driver (not of the driver itself) and the cup appears to boost a small band between 100Hz and 200Hz by about 2dB. I can't see any other effects. The plots are of an HD681-EVO with stock pleather pads with half-felt in front of the driver + highs filter. As this test was to compare the before and after a certain mod only this doesn't really matter that much. Green trace is with paper filter, blue trace is without the paper filter. In essence removal of the paper filter seems to increase the bass (between 100Hz and 200Hz) a tad.
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Post by goldenboy on Mar 5, 2014 22:16:42 GMT
You're the best! I'll just return the paper filter back and do a filter mod once i got the parts needed. Many thanks for your help.
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Post by goldenboy on Mar 14, 2014 22:09:21 GMT
Hi Guys, I have a question and hoping for your opinion and advice.
I currently have a 681EVO and thinking of buying a pair of 668Bs and mod it later on to have a different sounding HP or close to a modded 681? (original 681 is not available in our local stores and don't plan on buying online)
Would you guys recommend it or just do a filter mod on my 681EVO?
Does the modded 681EVOs have a big difference vs a modded 681s in terms of sound quality and musicality on an average ears?
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Post by Deleted on Mar 14, 2014 23:01:29 GMT
Hi Guys, I have a question and hoping for your opinion and advice. I currently have a 681EVO and thinking of buying a pair of 668Bs and mod it later on to have a different sounding HP or close to a modded 681? (original 681 is not available in our local stores and don't plan on buying online) Would you guys recommend it or just do a filter mod on my 681EVO? Does the modded 681EVOs have a big difference vs a modded 681s in terms of sound quality and musicality on an average ears? Hi Golden boy, from your post I am not sure what exactly you are asking. I do not have the 681Evo, but do have the original 681 (with Frans filter) plus an unmodded 668B. If you can focus your questions a little bit more, I, or another member of the forum, maybe able to help. Jeff
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Post by goldenboy on Mar 14, 2014 23:52:06 GMT
I was thinking of buying another headphone like 668B for a different sound signature (or mod it like the original 681) or just do a filter mod on my current 681EVO.
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Post by solderdude on Mar 15, 2014 7:37:35 GMT
I think the 668B sounds a bit 'boring' compared to the 681's on a lot of music. It is the more neutral one with less bass and less highs.
The EVO and original sound quite different as well. The EVO with Chinese pads comes much closer to a modified HD681 though.
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Post by Shirou on Mar 20, 2014 9:52:49 GMT
Hello solderdude. I just wanted to drop by and say thank you so much for all the information you've provided on the Superlux HD681 EVO and it's modifications.
I've done a ridiculous amount of researching lately on budget headphones and I've finally made up my mind and ordered the white model EVO (2nd revision with extra velour pads) + Chinese ebay earpads from wang_yifei which I'll replace the stock one with.
Here's my dilemma: I really don't think I'll be doing the half felt modification since I have no means of making a filter on my own. (that and I'll probably end up destroying my brand new headphone by accident then start crying in the corner) I also read in your previous posts that the half felt trick works only in synergy with the filter mod so that's why it's a no go for me.
So I was wondering if you've ever tried replacing the stock felt with a thinner one? Maybe 50% the thickness of the original? We could just slice the stock one right down the center and see how it works out. I'm worried cutting it might end up uneven all over the place unless you got a really sharp knife lolol. If it doesn't work we can always lightly glue the pieces back into one or something but then there might be air pockets in-between if it's not done right and I have no clue how that would affect anything. I'm pretty new at this.
Chinese ebay pads / 50% thickness full circle felt vs Chinese ebay pads / Filter / Half felt (graph on the last pdf page if if I recall correctly)
The latter's obviously gonna be the superior one but I'd still like to see how it stacks up. It's up to you whether you want to try it or not. I don't need any results right away since it'll be awhile before I receive them in the mail anyway. They'd also require burn-in time too.
Here's another potential idea: half the felt facing the back is 100% stock thickness + the other half facing forward is 50% thickness. I hope that didn't sound stupid cause I'm writing all this at 6AM.
Peace and thanks for your time.
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Post by solderdude on Mar 20, 2014 16:13:45 GMT
To get the correct amount of highs (using the Wang-Yifei pads) you either leave on the felt as is stock OR use the electronic filter + half felt. The amount of highs will be almost the same but the filter + half pads has slightly better extension and more 'air'. The sonic signature (amount of treble) will be about the same.
Before you work on the felt discs you will have to remove them. do NOT cut the disc in half while still on the driver.
The felt disc is glued on its edges and can be pried off and when cleared pulled off. Once removed you can use scissors or a utility knife to cut it in half.
So listen to it with the stock pads. Listen to it with the Wang Yifei pads. If you like it with the Wang-Yifei pads it will be O.K. If you find it still lacks (upper) treble remove the felt disc and cut it in half. If that yields too much highs make a half disc from thinner material. De-makeup pads, 2mm felt etc. till you find the right balance.
To fix the felt disc (half felt disc) use a small amount of glue on the edge only (preferably tixotrope glue that cannot get in the driver part)
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Post by Shirou on Mar 20, 2014 21:04:51 GMT
I'll probably just leave the felt inside + Wang Yifei pads and see how it does after a long period of use. If it's not to my liking I'll just follow your advice. Thanks for the quick response!
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Post by VinnyG on May 16, 2014 15:14:36 GMT
Hello, i'm learning electronics and wanna do this for my 1º circuit, my question is if i own the newer type EVO(MKII) should i do the original filtermod circuit w/ 1mh inductor & nonpolar caps or i need to do the half-felt +filter w/ L1=470µH?? I'm a bit confused.
Thank's
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Post by solderdude on May 16, 2014 15:57:43 GMT
There are 3 ways to modify it all giving slightly different improvements:
1: Keep it stock but use the Wang-Yifei pads.
2: do the halfpad mod + L1 = 1mH + R = 33 Ohm in parallel to the inductor ONLY + Wang Yifei pads
3: Make the filter with the capacitors + inductors etc + halfpad mod + original pads
So the capacitor circuit is ONLY needed when you are using the original pads and is NOT needed when using the Wang Yifei pads.
If you are a novice I recommend to keep the filter outside of the headphone. Soldering the driver may be a bit tricky.
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Post by VinnyG on May 16, 2014 18:36:59 GMT
There are 3 ways to modify it all giving slightly different improvements: 1: Keep it stock but use the Wang-Yifei pads. 2: do the halfpad mod + L1 = 1mH + R = 33 Ohm in parallel to the inductor ONLY + Wang Yifei pads 3: Make the filter with the capacitors + inductors etc + halfpad mod + original padsSo the capacitor circuit is ONLY needed when you are using the original pads and is NOT needed when using the Wang Yifei pads. If you are a novice I recommend to keep the filter outside of the headphone. Soldering the driver may be a bit tricky. Thanks for the fast answer, i'm using original(velvet) pads then i'll stay with the 3º option, sure i plan to do an external filter, mainly to use between my sound card & the superlux. I already copied the schematics to Proteus Cheers.
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