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Post by Deleted on Mar 10, 2015 21:02:11 GMT
Ian keeps talking about this filter for the HD 650 & I'm intrigued. Once I get my Ember I'd like to give it a shot (the desktop variant obviously).
Is it actually for sale yet & if so how much does it cost?
Is it active or passive?
I've only just been turned on to this tonight so I'll make sure I read through this thread tour de suite.
Gordon.
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Rabbit
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Post by Rabbit on Mar 10, 2015 21:36:23 GMT
The amp I used was a one off that Frans made for himself, Gordon. It's a desktop amp. Small, with a cutout in the box in order to change the filter. It's an active filter that targets certain frequencies where headphones show anomalies in frequency response.
There may well be a filter on the way that will plug into the Ember or Polaris. Not sure when though.
Basically, the hd650 sounds good, but if you measure it, it's shows a mid bass hump and a roll off at the bass, so really, sub bass is very low in volume.
The filter brings the sub bass right up and knocks the mid bass hump for six. Because the mid bass is lowered, the treble seems to become more apparent, so it sounds more like an hd600 with a bass welly that is incredible.
Since having the filter here, I now find the hd650 without it a bit lacking. You don't notice until you hear it. It actually sped me on my way to the th900 if I'm honest since I couldn't do without proper sub bass. I have found that the reason I like a raised bass is that I actually miss the really low frequencies in headphones. Most don't get close. Once the really low stuff is there, the headphone takes on a character that is much more believable. Even the little Philips headphone I have here sounds extremely good, because it produces very low bass. They don't sound bassy, but just give a powerful attack when it's down there.
Having said that, I would like a filter for my Senn hd650 or else it will be going and I'll stick with the th900.
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solderdude
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Post by solderdude on Mar 10, 2015 21:37:57 GMT
The filter Ian talks about is the Kameleon. The filter board discussed here is capable of more corrections than what Kameleon is capable off. Of course a HD650 variant can be made on this board as well. It needs a power supply and a box with a input and output sockets. BUT it is only suited for 1 headphone type where the Kameleon takes filter modules. When you only have 1 headphone to correct than this version is the better one (technically) Javier can build these boxes. PCB's are in stock. If you have a DC wallwart doing nothing (can be 5V, 12V or 24V) you can save money on the power supply. There will be a 'kameleon filter type' board made by Jeremy that will be powered by G1217 amps power supply in the pipeline. May take 6 to 12 months before it will see the light of day I reckon. I could also calculate the filter so it slightly boosts the subbass even (instead of perfectly flat)....  |
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Post by Deleted on Mar 10, 2015 21:48:20 GMT
OK guys, thanks. I can wait for it. If you remember I tried to replicate the filter with EQ and had some success. The mid-bass hump was relatively easy to nullify but I cannot seem to achieve this sub-bass boost you talk about. I've adjusted in the correct part of the range but I just don't really hear an increase.
Gordon.
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Rabbit
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Post by Rabbit on Mar 10, 2015 21:51:22 GMT
Oh yes.... I'd forgotten.
The Senn behaves like a top notch headphone once it's got one feeding it. It's like having another octave of music added in the bass with better mid clarity.
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juke
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Post by juke on Mar 10, 2015 23:28:12 GMT
Oh yes.... I'd forgotten. The Senn behaves like a top notch headphone once it's got one feeding it. It's like having another octave of music added in the bass with better mid clarity. I made the Kameleon filter for the 'new' 650s a while back, Ian's fault as usual, and I have to say the difference is startling. I honestly wouldn't use them now without the filter, they sound, to me, like a different 'phone. Syd |
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Rabbit
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Post by Rabbit on Mar 11, 2015 6:00:31 GMT
That's basically how I feel Syd. My HD650 is taking a break now the Kameleon's gone home.
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solderdude
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Post by solderdude on Mar 11, 2015 7:39:51 GMT
But a few of your headphones don´t get much time off while making filters for those.
Only the Grado is uncorrectable.
Jeremy should start on the ´Kameleon´ module rather sooner than later....
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Rabbit
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Post by Rabbit on Mar 11, 2015 7:55:00 GMT
Actually Frans, it is surprising how quickly your expectations change with headphones. I find myself becoming more and more picky these days. I blame your Kameleon of course Sent from my D2403 using proboards |
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solderdude
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Post by solderdude on Mar 11, 2015 11:08:50 GMT
I suffer from the same thing...
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Post by chris1967 on Mar 18, 2015 16:13:21 GMT
I have read the thread through, and i am interested in a filter for the HiFiMan HE-500.
I have read here that with filter it can become "ruler flat".
I see aso that the filter is common for the HE-6.
Please explain how can it be the same for the two (the only point i find that they might be different is the adjuster pot with different values for the two?) or is this irelevant bcause both phones have similar graphs?
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solderdude
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Post by solderdude on Mar 18, 2015 16:59:11 GMT
I haven't measured them myself but feel Tyll knows how to put a HP on a rig.  When you look at this plot (don't mind the absolute accuracy, just the relative) and you can see they all perform closely the same. They do differ in efficiency and slightly in an absolute sense. What the filter does is lower the peak and increase the upper mids. |
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Post by chris1967 on Mar 18, 2015 17:06:06 GMT
OK fine, i understand.
Do you think i need something like an LM317/337 @+/-15v (with LM4562) or something more fancy?
I would like minimal distortion/ maximum transparency
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solderdude
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Post by solderdude on Mar 18, 2015 18:27:25 GMT
LM4562 will do fine on 15V.
They do get warm on 15V but with a regulated +/- 15V this should be O.K.
simple regs should be enough given the high enough CMRR of these opamps.
You could replace the gyrator with an inductor for lower noise levels if needed.
Only when you feel the treble is a bit thin and 'off' and feel the HE500 is lacking in 'clarity' you should make the filter.
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Post by chris1967 on Mar 18, 2015 18:34:57 GMT
I am not sure what replacing the gyrator with the inductor means.
Yes since i bought my HE-500's there is something wrong with their sound, there is an irritating spike somewhere although the highs are not accentuated, and of course they don't come close to detail retrieval like my HD800's, so i think this might be solved with the filter.
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