|
|
Post by PinkFloyd on Dec 9, 2009 21:15:01 GMT
Here we have some mods kindly sent to me by Frans de Gruijter of The Netherlands (thanks Frans!) They come complete with very good instructions / blow by blow pictures and a schematic of his filter circuit. I haven't tried them yet but will definitely give them a go over the holiday period. Here they are: www.rock-grotto.co.uk/HD681.pdfwww.rock-grotto.co.uk/HD6812.pdfFeel free to add any more mods / tweaks to this thread.... I will post details of Mick's (Helliharris) alu ring tweaks here also. Mike. |
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Dec 9, 2009 21:28:54 GMT
Did he mention what differences these mods make to the SQ Mike!!.
|
|
|
|
Post by PinkFloyd on Dec 9, 2009 21:40:20 GMT
Did he mention what differences these mods make to the SQ Mike!!. Yes Mick, and I quote: "Hi Mike Mod your HD681 and they will REALLY shine !! The slightly too much treble will be in balance. Awesome. And replace the sweaty pads with original AKG K240 velours pads ! Yes I have done my homework. Have made a description on how to mod the headphone (for free). Interested ? kind regards, Frans" I'll make Frans aware of this thread and hopefully he will give some more detailed input. |
|
|
|
Post by clausdk on Dec 9, 2009 23:14:25 GMT
Here we have some mods kindly sent to me by Frans de Gruijter of The Netherlands (thanks Frans!) They come complete with very good instructions / blow by blow pictures and a schematic of his filter circuit. I haven't tried them yet but will definitely give them a go over the holiday period. Here they are: www.rock-grotto.co.uk/HD681.pdfwww.rock-grotto.co.uk/HD6812.pdfFeel free to add any more mods / tweaks to this thread.... I will post details of Mick's (Helliharris) alu ring tweaks here also. Mike. Does it make a difference if one makes the filter in an extensioncord or something ? Does it have to be so close to the drivers ? |
|
|
|
Post by PinkFloyd on Dec 10, 2009 11:13:54 GMT
Here we have some mods kindly sent to me by Frans de Gruijter of The Netherlands (thanks Frans!) They come complete with very good instructions / blow by blow pictures and a schematic of his filter circuit. I haven't tried them yet but will definitely give them a go over the holiday period. Here they are: www.rock-grotto.co.uk/HD681.pdfwww.rock-grotto.co.uk/HD6812.pdfFeel free to add any more mods / tweaks to this thread.... I will post details of Mick's (Helliharris) alu ring tweaks here also. Mike. Does it make a difference if one makes the filter in an extensioncord or something ? Does it have to be so close to the drivers ? No Difference at all Claus.... Frans says: "the first 2 filters were built in an extension cord. There is no audible difference between a built-in filter and a filter in an extension cord. if you want even less treble replace the 39 Ohm resistor with a 56 Ohm resistor. The 'character' of the headphone will still be preserved. Bass and mid presentation will not be altered by the filter. Only the exaggerated details and 'Sss' will be balanced to normal representation. Call me stupid but I prefer the HD681 with filter above my HD650 and DT770 and DT880. If you do not like sweaty ears... order the velours pads." |
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Dec 10, 2009 12:59:43 GMT
|
|
|
|
Post by clausdk on Dec 10, 2009 13:06:56 GMT
Frans please, please join us.
Dank uw all
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Dec 10, 2009 13:36:46 GMT
Frans joined, nickname solderdude.
|
|
|
|
Post by clausdk on Dec 10, 2009 17:16:23 GMT
Frans joined, nickname solderdude. Great, those filters of your have you tried them on a DT770 ? Because if it can be used on them it would also be great for the HD660 which have a bit to much in the high department. Also can the filters be directed against every part Bass, middletone ? |
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Dec 10, 2009 19:20:48 GMT
Frans joined, nickname solderdude. Great, those filters of your have you tried them on a DT770 ? Because if it can be used on them it would also be great for the HD660 which have a bit to much in the high department. Also can the filters be directed against every part Bass, middletone ? clausdk The filters would be tuned specifically to cover large HF peaks pertaining to the particular headphone. It would have been interesting to see graphically what the peaks were beforehand, so a comparison could be made. It would not be feasible to correct lower frequencies because of the much larger values of capacitance and inductance needed. SandyK P.S. You may be able to tame the HD660 a little in the HF department by adding a little series resistance in the output. |
|
|
|
Post by clausdk on Dec 11, 2009 12:33:57 GMT
Can such a filter be directed against a specifik KHz, I got a peak at 12-14 Khz that I would like to take down a notch..
In the output of the headphones ? Where is that ?
If greater Capistance is needed for bass and higher for treble, then one could assume that a specifik capistance corrosponded to a certain area in the Hz scale ?
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Dec 11, 2009 19:53:00 GMT
Claus
Yes,it can. I did that with a pair of Vifa speakers which had a peak in that area. I used L,C and parallel R which governs basically the width of a notch. Ask someone like Robert who is very good in those areas.
Alex
|
|
|
|
Post by clausdk on Dec 12, 2009 12:35:10 GMT
|
|
|
|
Post by PinkFloyd on Dec 12, 2009 21:00:40 GMT
I want a pair of these pads Claus but can't speak German (thankfully we won the war and weren't force fed the language and the compulsory wearing of small moustaches  ) If I paypal you the funds could you order a pair for me? Mike.  He cannot be einen kleinen serious... Vee vun zee Var!!.... Vee drive Mercedes and Zee einen kleinen vorsh sprung technik shits all over Zee "Morris Marina" ;D |
|
|
|
Post by PinkFloyd on Dec 12, 2009 21:28:09 GMT
Hey Adolf! There's fck' all wrong with a Morris Marina.... British technology at it's best!  It's not how you make them..... it's how you drive them..... that's why we won the war  |
|
|
|
Post by dean0 on Dec 12, 2009 22:04:19 GMT
do they come in any other colors? also the pads looks a little flat, could just be the angle of the picture |
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Dec 12, 2009 22:18:42 GMT
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Dec 12, 2009 22:28:05 GMT
Yep, the secret how the allies won the war is out....  |
|
|
|
Post by PinkFloyd on Dec 23, 2009 21:26:01 GMT
I finally got round to fitting Mick's (Heliharris) aluminium rings today and the process was VERY easy thanks to the precision fit of the rings, they are spot on! I decided not to go down the messy araldite route and instead went for superglue on the smaller rings and contact adhesive (Evo stick) on the two large rings. All you need on the smaller rings is 5 or six small spots of superglue (pour some superglue onto a piece of card and dip a small screwdriver into the pool... use this to apply the small spots..... dont "drown" the joint with superglue, use as little as possible) this provides a VERY strong joint. On the larger rings I applied a thin film of contact adhesive to both surfaces and left to dry for 15 minutes.... once dry to the touch a simple case of bonding the two together.... again, this provides a VERY strong joint but, unlike araldite, a join that can be seperated should you ever want to transfer the rings to another pair of HD-681 (for example, if they were to blow a driver for instance). All in all the job took about 1 hour.... the most time consuming job being the removal of the existing contact adhesive, I removed it with the flat edge of a screwdriver. Whilst I was at it I shortened the headphone lead and fitted a Neutrik jack but this is only a temp measure as I will be recabling these shortly..... Dean was right, the internal connections are less than ideal..... It "appears", from a quick look, that the connections (conductors) to the right hand driver are the two metal rods that span the headband.... erm, if this "is" the case then I agree with Dean, it would be better to go dual entry.        |
|
|
|
Post by dean0 on Dec 23, 2009 22:53:02 GMT
Great job, those rings look awesome, any idea if more are too be made?[/quote] Have a word with Mick (heliharris).... He's making a few for members, maybe he'll add you to the list..... Not "great" but it works and, considering the price point of the 'phones, a sensible way to go for the manufacturer. Personally, I see no problems "mechanically" but it may be argued that "steel rods" are not the best conductors you can get ;D..... having said that, I wonder just "how" much of an improvement OFC cable will make? The HD-681 is bloody good "as is".... Is it worth all the effort and expense trying to improve on it? Yes.... noted..... any "change" will bring about a difference to the SQ.... I think, with the HD-681, we should be "adding" dampening.... not taking it away.....  |
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Dec 23, 2009 23:02:06 GMT
Still, in their original guise they are incredible performers at their price point. Naturally, they aren't suited to all kinds of music, but then, which headphones are ? |
|
|
|
Post by PinkFloyd on Dec 23, 2009 23:31:11 GMT
Have a word with Mick (heliharris).... He's making a few for members, maybe he'll add you to the list.....
Not "great" but it works and, considering the price point of the 'phones, a sensible way to go for the manufacturer. Personally, I see no problems "mechanically" but it may be argued that "steel rods" are not the best conductors you can get ;D..... having said that, I wonder just "how" much of an improvement OFC cable will make? The HD-681 is bloody good "as is".... Is it worth all the effort and expense trying to improve on it?
Yes.... noted..... any "change" will bring about a difference to the SQ.... I think, with the HD-681, we should be "adding" dampening.... not taking it away.....
|
|
rickcr42
Fully Modded
Rest in peace my good friend.
Posts: 4,514
|
Post by rickcr42 on Dec 24, 2009 0:36:38 GMT
The cosmetic and earpad mods KICK BUTT and take a Walmart shelf "blister pack" looking set of cans into a "we even boxed them up for you because we care" cans. The EQ ? not sold on the idea being one that believes less is more and what you have is,well,what you have also.i would suggest those with limited listening/burning in time deciding on IF they like the cans or not "as is" before making such a radical change in SQ.Far too often folks perform a mod before they even know what they have then go from forum to forum touting the mod,saying how much BETTER the change is when the truth is those knuckleheads have NO CLUE if the statement is true or not,worse,many times it is from folks with a high post count which means when THAT person posts newbies LISTEN which means the lie is perpetuated. Not saying that is the case here,just that it is something to consider. And finally.Probably the most enthusiastic usern of passive eq to EQ the sound of his cans is the well known Seifreid Linkwitz who swears by it www.linkwitzlab.com/reference_earphones.htm |
|
|
|
Post by clausdk on Dec 24, 2009 1:18:45 GMT
I have read somewhere that The AKG 701 also uses the headband as a cable.
|
|
|
|
Post by PinkFloyd on Dec 25, 2009 23:22:09 GMT
The cosmetic and earpad mods KICK BUTT and take a Walmart shelf "blister pack" looking set of cans into a "we even boxed them up for you because we care" cans. Mick (Heliharris) has done a VERY good job making these rings and they are not just "cosmetic" Rick..... Mick and I both agree that there are sonic benefits with the addition of the rings.... whether that be down to more "mass" / weight or just pure placebo, who knows.... there is a definite "tailoring" to the highs and more definition to the bass with the rings fitted.... to my ears anyway ;D Couldn't agree more.... I was so impressed by the 'phones "as is" that I recommended them as the "headphone bargain of the century"..... If I thought they were really lacking in any department then I would not have recommended them. Ears are like fingerprints (unique / we all hear things differently) so it's only natural that some will find certain aspects of the 'phones presentation "lacking"..... there is, unfortunately, no "one size fits all" when it comes to transducers and it's all about finding a pair of 'phones that suits your own set of unique ears. I have no reason to try EQ mods as my ears are pretty satisfied with the HD-681 "as is" but, for anyone who may find the highs a bit exaggerated, the EQ mods may be just what the doctor ordered..... it's good to have this info on tap and the more we can do to "tailor" headphones to our personal taste the better. To go full out and follow all and every "mod" blindly is just plain stupid, if you are quite happy with the presentation the way it is then leave well alone....... as I say, the EQ mods "may" be of use to people (maybe younger listeners) who may find the treble a bit exaggerated...... to my ears, there's not "enough" treble but there's no mod for that unless they develop "ear transplants" Remember Rick, we are half a century old and can only go by what our old ears tell "us"..... a 17 year old, for example, may find the EQ mods beneficial. These are £15 GBP ($23 USD) 'phones and, thus, financially "open" to tweaking..... no reason, at all, that anybody who is proficient with a soldering iron shouldn't have a go if that's what takes their fancy.... but only "tweak" if you find something lacking I stand by what I said, these 'phones (in stock guise) are up there with anything Sennheiser, AKG or Grado have on offer (at ANY price)..... just a matter of, whether or not, your ears agree with mine. I have no intentions of "modding" mine but will be, hopefully, fitting leather pads early next year just to "up" the comfort levels. |
|
) If I paypal you the funds could you order a pair for me?
