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Post by coil on Dec 14, 2012 15:30:16 GMT
Tried different filters (without amp/dac) and seems that mkII filter is good for me. Although it still feels very little overpowered with highs. But Aune T1 should make it sweeter and atm I will leave mkII filter. Still, wont close the box I made before tryout with T1. Little pic:  e: About removing those damper stickers - tried it and do not recommend it! Bass (deep lows mostly) lost their "punch". Had to do my own new stickers (sticker must be thick enough and stiff). Well, at least this mod has been excluded from my HD-681 mod list. |
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Post by coil on Dec 16, 2012 9:57:09 GMT
Q: mkII filter has center point around 7.2Khz... if i wish to move it towards 6Khz, should I raise 1uF value to 1.4uF for example? e: Help with last question, anybody?  Want to finish second filter box too but can`t until I get some info. Here is the mkII finished filter box, oak + teak oil:  e2: read this thread carefully through and found some filter info about HD-662. Tested different resistors and to my ears best for HD-662F is: r1 = r2 = 47 Ohm r3 = r4 = 51 Ohm (56 Ohm if guitars and cymbals feel too bright) C1 = C2 = C3 = C4 = 1.33uF (1uF // 330nF) L1 = L2 = L3 = L4 = 470uH Have not done coin and pad mods to HD-681 yet but starting to like HD-662F more and more. For longer listening HD-681 sounds still littlebit more fun because of deep lows. I`m considering to buy HD-662 too because of that (and closed cup design too). Wonder how HD-681 drivers would sound inside HD-662 cups? Will try it soon I think  |
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Post by coil on Jan 1, 2013 21:27:48 GMT
Made new pads. Took me one test pad to get what I wanted but result is good. Made for my head (angled pads). Some pics:     Up next - WOOOOOD! ;P |
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Post by madmarty on Feb 3, 2013 1:38:09 GMT
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Post by Deleted on Feb 3, 2013 16:44:49 GMT
Up next - WOOOOOD! You dirty beast. It's only a headphone. 
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Post by superluxman on Feb 8, 2013 20:38:40 GMT
Did somebody try to add/change the dampening material? I tried to use the same or similar material as on those photos with my HD-668B. The result not impressed. The upper highs were redused much more then the target frequency. Thus, the electronic components filter is preferred. Advice: use film capasitors and coils without ferrite core for less distortions in audio signal. |
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Post by madmarty on Feb 12, 2013 0:36:05 GMT
Thank you for the advice. Some guy tried it with 2 layers of thin see-through dish washing cloth like this www.duden.de/_media_/full/S/Spueltuch-201020593395.jpgIn result the highs have been less sharp but I will go with the solder-method. I searched for technical differences between the superlux 681 to b and f and also to the hd7. Is it right that the driver is always the same. So I guess the differences are mostly in the dampening cloth which is used? I read that the hd668 does have a different driver? rabbit: I ordered leather and will try a combination of leather and alu rings ;-) I hope it works like it imagine. |
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Post by superluxman on Feb 13, 2013 19:39:20 GMT
I searched for technical differences between the superlux 681 to b and f and also to the hd7. Is it right that the driver is always the same. So I guess the differences are mostly in the dampening cloth which is used? HD681 and HD7 are the same headphones as well as Axelvox HD241. In both cases OEM is Superlux. The difference is in the details which are not affect the sound. The thing is that chinese (Superlux) made briliant and cheep headphones and more known brands is selling us the same headphones for the more money. I read that the hd668 does have a different driver? Yes, driver in HD668B has different impedance than HD681 has. |
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Post by Deleted on Feb 16, 2013 23:47:24 GMT
My first post here. I've read this thread a couple of times. A few weeks ago I bought both the Superlux HD668B and HD681 after reading about it. The HD668B didn't really please me much, but my daughter thinks they're cool! I applied the "Mark I" filter mod of the first post in this thread to the HD681 which improved the first impression. I liked it and could even impress my "audiophile" friend. I tried it with socks over the pleather ear pads but in the end got me some AKG velour pads from Thomann instead. Weeks of fun followed!  After reading further into the thread I decided to buy another two HD681; one for the Mark II filter mod and one for my friend with the mod he prefers after listening to both. Today I applied Mk II mod to one of the HD681's. This is quite a difference. I'm not sure which I liked best. They're so different that they could suit different needs; Mk I for (instrumental) jazz and pop and Mk II for classical and vocals I think now, but maybe over time it will change. Both are my main HP's for listening now. I have a Sennheiser HD25-1 and a wireless Sennheiser RS140, but these are both closed and therefore cause more ear fatigue. Those were initially bought for the home recording studio. Since the Heliharris ring mod seems unavaible (according to info in this thread; too bad), I coloured the ugly bright red with a black permanent marker which gives it a OK wine red glossy colour. I removed the Superlux logo from the headband using nail polish remover. Now they also look smart. 
 So, thank you to everbody on this forum who made this possible.  Frank P.S. If anybody has suggestions for other (cosmetic) improvements (metal rings !?  ), please let me know. |
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Post by madmarty on Feb 21, 2013 0:30:11 GMT
Maybe I'll make some rings but I it wouldn't be possible to offer them for free. I even thought of making the whole housing out of aluminum if I have to much time some day. I'm curios how would affect the sound.
@ superluxman: strangely there are some people who claims that the HD7 sounds better than the HD681 and that the highs are not so harsh.
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Post by superluxman on Feb 22, 2013 20:32:36 GMT
strangely there are some people who claims that the HD7 sounds better than the HD681 and that the highs are not so harsh. I don't know about what occurrence you say and who and how made those comparison. But I can assume why it may be some difference: 1. May be that earpads of one or other headphones are already threadbare. 2. May be different release date or different production lines. 3. May be different dampening material (unlikely). 4. May be placebo. Still have a doubt? Listen to both of them in music store if you have such possibility. |
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Post by PinkFloyd on Feb 22, 2013 21:04:32 GMT
What lunatic started this threaD?  |
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Post by dcfis on Feb 23, 2013 3:22:49 GMT
In Korea they have discovered the HD681 too. Finally the first (independant) measured graph and EQ solution based on measurements instead of SQ description based on earcanalshape/ear/brain/mood/preference/filsophy/'religion'/age. I like that ... goldenears.net/board/?mid=PT_GER_Sound&search_target=tag&search_keyword=HD681B&document_srl=105064Too bad I can't read Korean and automated web translation services can't well either but you'll get the picture. And yes.. I know .. measurements in the amplitude/frequency domain do not tell the whole story but they do tell the biggest part of it. For more bass leave the -4dB@40Hz out and the HF EQ is nearly identical to my filter mod (which was based on the original graph provided by Superlux and my personal earcanalshape/ear/brain/mood/preference/filsophy/age listen thingy) I wonder if and when HeadRoom starts selling these cans. Then there will be more graphs and discussions/opinions. @ mike: The red leather pads were sent on tuesday instead of monday from the Netherlands. This is because they made the letterbox opening very small to prevent damage to the mail from fireworks. So I had to go to the post office on tuesday. In some cities they even completely remove letterboxes because they have a tendency to burn on new years eve. Thanks for this, has anyone a speculation what the Q is to use for a parametric eq (specifically Jriver) seems to me the settings might be -4@40 Q2; +5@700 Q2; -6@7000 Q1 +3@20000 Q4. Anyone disagree? |
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Post by frigo on Mar 3, 2013 22:42:38 GMT
Hi
Does anyone know what kind of software did Frans use to design the filters and measure the frequency response?
I've tried a few circuit designer software, but they aren't exactly geared toward passive filters, and I also lack the proper knowledge about electronics how to work around that. In CircuitLab I tried to put a voltage function generator and a ground as input, and a 32 ohm resistor as the headphones, but the frequency domain simulation gave back silly responses.
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Post by superluxman on Mar 4, 2013 19:51:07 GMT
Hi ) You want to design your own filter? But for what? You can use the filters published in this thread. If you want to have some experiment use Multisim. |
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Post by Rabbit on Mar 4, 2013 20:39:14 GMT
Hi Does anyone know what kind of software did Frans use to design the filters and measure the frequency response? I've tried a few circuit designer software, but they aren't exactly geared toward passive filters, and I also lack the proper knowledge about electronics how to work around that. In CircuitLab I tried to put a voltage function generator and a ground as input, and a 32 ohm resistor as the headphones, but the frequency domain simulation gave back silly responses. He measured the headphone to work out where the problem was and then worked out the values mathematically, I think. The one he designed works amazingly well on the HD681. |
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Post by frigo on Mar 5, 2013 15:59:43 GMT
Hi ) You want to design your own filter? But for what? You can use the filters published in this thread. If you want to have some experiment use Multisim. Nope, I'm just curious about the frequency and phase response of the original filter. Might play with it though. |
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Post by madmarty on Mar 6, 2013 1:49:32 GMT
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Post by frigo on Mar 17, 2013 18:26:01 GMT
Am I correct in guessing that the second (medium) filter is more aggressive than the first? Do they have the same Q? Anyway, finally had time to do the (medium) filter. It sounds wonderful. Has a bit more highs than I'd find ideal, but I can live with it   All images: imgur.com/a/4j8IV |
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Post by frigo on Mar 19, 2013 0:09:02 GMT
Why are both a parallel and a series filter needed? I understand what the parallel RLC circuit is doing, but I don't quite get what the series one is there for. Built the entire filter in CircuitLab, removal of the series filter does not seem to do anything to the phase or frequency response. Why is that?
Edit: Nevermind, realized it, duality. I'm too noob for this.
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Post by madmarty on Mar 23, 2013 4:32:41 GMT
Today I started soldering the filter. Sadly the employee gave me 47Ohm instead of 56 Ohm resistors so I couldn't finish.  |
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Post by Lins on Mar 28, 2013 8:53:39 GMT
Hello,
is' possible to simulate the three filter ( First, MKII, Third ) with a software EQ ?
On my SansaClipV2 with RockBox i tried to change the EQ and i found my preference with Treble -2db and EQ 12300hz -4db q1.4 but i want to compare the different filter and choose which model build
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Post by frigo on Mar 31, 2013 13:27:54 GMT
Spent half of yesterday creating a software EQ/peak filter for my two HD681s. My aim was to provide a relatively flat frequency response (should fit in +/-5dB) and to provide excellent listening experience, as opposed to eliminating peaks. So far the result is: Electri-Q, Peak (Orfanidis) filter, -10dB @ 4800Hz, BW=3.0 (Q=0.4041, can be Q=0.4 and BW=3.0227) Compare raw and filtered. Used software: foobar2000, Virtual Audio Cable, VSTHost, Electri-Q, Arta |
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Post by coil on Apr 1, 2013 22:47:35 GMT
Guys, at first I thought I will copy the "original" design of superlux ( It`s too much hassle to make from wood) but I think I will make my own design with different detail fitting & locking, but leaving the basic sound affecting design same Will keep you updated if I reach somewhere with this project. Maybe will do some for selling & reviewing. |
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Post by joska on Apr 8, 2013 20:46:09 GMT
hello!!!
i'm new here and and i want to know where can i find helliharris ring's?
see you
joska from france
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Want to finish second filter box too but can`t until I get some info.
), please let me know.
