Rabbit
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Post by Rabbit on Mar 18, 2014 5:59:13 GMT
It can be helped with a passive filter that Frans designed for the hd650. It is a very lush sound for a headphone!
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Post by musicman on Mar 18, 2014 13:46:02 GMT
Hi Rabbit, could you tell me where to acquire passive filter that Frans designed for the hd650? thanks Don
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Post by chinook9 on Mar 18, 2014 17:38:01 GMT
Hi Rabbit, could you tell me where to acquire passive filter that Frans designed for the hd650? thanks Don www.mediafire.com/view/td13lqn06i5mbz2/correction_filter_manual_%28Nov-06-2013%29.pdfRabbit may be able to point you to something else, but I believe the information you need is in the pdf at the link. I am going to take a look at it again. I have soldering skills and I have built some electronics kits, but on first glance I thought this one would be beyond me.
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Rabbit
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Post by Rabbit on Mar 18, 2014 17:48:24 GMT
Yes, that's the link. It does give the HD650 a lift in the top but the basic sound of the headphone is pretty lush tbh. I often use the DT990 because of that. It has a more prominent treble which is nicer for string sound.
Failing that, the modded T40 with filter ...... really good.
Actually, the HD650 kind of put me off spending much more on a headphone, since you may well end up not liking the sound sig and after spending a lot of money, you kind of feel obliged to like it!! The mids on the 650 are really good though in comparison to the DT990.
I like the HD650 a lot in spite of the treble presentation, since it is really smooth, but you do feel that you are missing something up top sometimes. I then go to the DT990, but then I feel that the mids aren't as good, so it's swings and roundabouts for me.
I think that the HD650 is a good all rounder though. Every time I go back to it (like now you've reminded me) I do enjoy its presentation a great deal.
Trouble with headphones is that you always thing that there could be better around the corner.
I would LOVE to try a hifiman but I ain't spending money on something I may not like!!
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solderdude
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Post by solderdude on Mar 18, 2014 19:09:02 GMT
Rabbit: I can't give you a detailed answer on the 558s. I liked the 558s a lot and so I went ahead and got a pair of HD650 followed by the DT990. After I got the 990, I packaged the 558s for resale and I haven't listened to them since. I remember I thought they were a good value for the money. Due to liking the DT990 so much I got a pair of T90 which is a clear step up. I listened to the T90 primarily for a couple of weeks and they seemed to be everything I could wish for in a headphone but after listening to the HD650 and the modified Fostex T50RP again I know there is something the T90 appear to be lacking. Its hard to explain what it is, but both of the latter headphones seem to have more of a fluid sound that has an appeal. Both the HD650 and the modified Fostex sound to me like superb headphones that place a slight veil between my ears and the music. If I can figure out how to lift the veil I will be a happy boy. I may try tuning the Fostex a little but I doubt that it will do much good. A small part of that veil may be what you refer to as warmth. I do have a filter schematic for an external passive (so no power supply needed) filter that can be used between the output of an amp and the T90. It takes something of the (fake) details away but the real details (as the HD650 can show, albeit a little too soft) will remain. It will make the T90 more in the direction of the HD650. download link: www.mediafire.com/view/0hqg47575xtejw1/T90_passive_filter.pdf
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solderdude
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Post by solderdude on Mar 18, 2014 19:16:23 GMT
Hi Rabbit, could you tell me where to acquire passive filter that Frans designed for the hd650? thanks Don The passive filter can be downloaded here: www.mediafire.com/view/q75063d2cq2fn2t/HD650_veil_lifter.pdfWhat the previously mentioned active filter does this one can not. The active filter boosts the lows, removes the overly warmish mids. The passive filter cannot do that but instead it lifts the mid-highs and highs somewhat so the HD650 becomes more 'clear' and sparkly. There is a passive one that can be mounted in the headphone cable (small extension cord) but that one doesn't work as well as the passive filter that is also described but is intended to be before the amplifier (like the active filter).
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Post by chinook9 on Mar 18, 2014 23:30:19 GMT
Thank you Frans. These T90 and HD650 filters are just what I want. I will be ordering the parts for them tonight.
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solderdude
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Post by solderdude on Mar 19, 2014 6:01:05 GMT
It should be noted that the HD650 filter (the inline filter) ONLY works correctly when used with a low output resistance amplifier. The T90 filter works with all output R amps.
If you only have low output R amps you can omit 6 parts in the T90 filter. However, should you be using it on an unknown output R amp or a high output R amp the filter effect will be different in that case.
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Post by chinook9 on Mar 19, 2014 7:02:51 GMT
It should be noted that the HD650 filter (the inline filter) ONLY works correctly when used with a low output resistance amplifier. The T90 filter works with all output R amps. If you only have low output R amps you can omit 6 parts in the T90 filter. However, should you be using it on an unknown output R amp or a high output R amp the filter effect will be different in that case. I'll be using them with the SR II so they should both work OK.
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Post by chinook9 on Mar 21, 2014 14:56:46 GMT
There is a passive one that can be mounted in the headphone cable (small extension cord) but that one doesn't work as well as the passive filter that is also described but is intended to be before the amplifier (like the active filter). Frans I believe I saw a post where you put one of these in a piece of plastic pipe. If I am correct could you direct me to that. My order from Digikey will be delivered today and I'm getting a little antsy.
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solderdude
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Post by solderdude on Mar 21, 2014 15:20:16 GMT
I mentioned in a post that I built one in a piece of plastic tubing (for electrical wiring in a house). The components are wired soldered directly to each other and to wires coming out of each end. The size of the components and how one can fit them in a tube without shorting deteremines the diameter and length of the PVC tube used. Once it is inside I mount the plug and socket and test it. When it tests O.K. and sounds just how I want it I slide some shrink tubing over it and heat it so it becomes a solid object.
I never made pictures of it but made one of those filters for Ian. Perhaps he can post a picture of it.
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Post by chinook9 on Mar 21, 2014 15:30:34 GMT
Thank you Frans. No picture required. I can go from your description. I'll take a look at the components and determine the smallest pipe I can use. Seems like black 1/2 inch irrigation tubing might work. I'll check it out.
I may just go ahead and put the initial one in a plastic soap dish for testing purposes. Thanks again!
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