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Post by PinkFloyd on Aug 10, 2007 18:28:24 GMT
Don't know who this guy is but it looks like he's either shit himself or just received an almighty dose of DC into his headphones
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leo
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Post by leo on Aug 10, 2007 18:41:27 GMT
I didn't see that one, good write up Mike! Main problem with amps like the Heed etc, you've got no protection, folks moan about coupling caps but at least it helps saves your phones incase of a problem Yep, nothing like the belt and braces approach.... better than "KABOOM!!!" into your lugholes, resulting in you having a heart attack and your favourite headphones up in smoke I agree with you there Mike, this Heed sounds rather good now for what it is but I'd rather go for something I trust a bit more, I enjoyed playing about with this design and it gave me an idea how it sounds, don't want a to be pulling a face like that bloke above, I'd say he's had a dose of DC and then followed through straight after
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leo
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Post by leo on Aug 10, 2007 18:43:32 GMT
Lovely cat Leo, more of a dog man myself but I do appreciate a well turned out animal. Taa, he is a lazy little shit though! mind you most cats are, they either eat, sleep or lick their arse!
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Post by dc on Aug 13, 2007 13:05:08 GMT
good to see that surgery is still being performed on the heed
honestly can't take credit for any of this. just trial and error really, and truth be told it was my first major modding job inspired by mike's thread on the other site. i'm normally pretty conservative, and have pinky to blame for this!
i'm also a bit sus about heed audio and their claims of the amps all being same and their QC. i think the fanboys that are so quick to defend heed are in bed with them because the differences seem quite large both in the cap values as well as the parts =\
oh well, no matter for me, i think the only thing still same with mine is the case and PCB
edit: oh, with the DC offset, not sure what it might be, but with my bastardised amp the AD823 measured negligible offset as does the AD843 (like <10mV) but the DY2000 was pushing the limits 40 in one channel and a bit over 50 in the other
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Post by mtl on Sept 27, 2007 18:10:29 GMT
As I just received the Heed I bought from Minivan, and dc over on HeadFi asked for a short comparison with the Lehmann black cube linear, which is the amp I do usually use, I thought I might just as well post my findings here as well: So, after a first listening session with the Heed against the Lehmann bcl (source was my Primare CDP D20, headphones were AKG K701 and Grado PS1, music was instrumental and vocal jazz) it's quite obvious that the Lehmann is the superior amp (and it better should be, considering the difference in proce...): It's less euphonious - or colored, if you will - more matter to fact and shows more details, has better control and really tidies things up compared to the Heed that tends to 'muddle' things together when the music gets a little more complex. Furthermore when you switch to the Lehmann, it's as if a thin, foggy curtain is removed from the music: everything seems clearer and closer to the real thing (especially acoustic piano!). So, sonically it's really another league, as it is built-wise, btw, and the switchable gain feature of the Lehmann (0/10/20 dB, switchable unerneath the unit) makes it extremely versatile imo. The second headphone out isn't bad either... (bottom line: if you ever get the chance to listen to the Lehmann you may be quite delighted ). Interesting also that the Heed runs far more hot than the Lehmann (maybe that's why it sounds 'warmer' in general??? ) and that while listening to the Heed I got a noise from switching on the Lehmann but not vice versa. Btw - I didn't think the soundstage was considerable wider on the Heed (something it got praised for especially) than it was on the Lehmann. Next step will be the comparison to the Meier Corda HeadFive and the Aria... and then, once it's here, with the Green Solo, which I then of course will also compare to the Lehmann!
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Nigel
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Post by Nigel on Sept 27, 2007 18:46:43 GMT
You say the Lehmann sounds better. Is this just the fact you can hear more details? Or does the music sound more cohesive, more emotionally engaging?
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leo
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Post by leo on Sept 27, 2007 19:24:23 GMT
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Post by mtl on Sept 27, 2007 19:35:58 GMT
You say the Lehmann sounds better. Is this just the fact you can hear more details? Or does the music sound more cohesive, more emotionally engaging? I do hear more details and to my ears there's more energy to the music - thus it's emotionally more engaging.
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Nigel
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Post by Nigel on Sept 27, 2007 22:38:21 GMT
Interesting leo. There's some comparisons with the Graham Slee Solo in there as well.
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Post by dc on Sept 28, 2007 1:02:12 GMT
solo vs lehmann !
look forward to it =D
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Post by gns on Sept 28, 2007 3:04:55 GMT
Interesting leo. There's some comparisons with the Graham Slee Solo in there as well. I'll have to get Mr Husband to listen to the green!
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Post by minivan on Sept 28, 2007 10:22:27 GMT
comparision of mtl 's lehman vs heed sound very similar to my impression of solo vs heed, so i would assume the lehman and the solo have fairy similar sound signature. look forward to mtl's solo vs lehman too
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Post by gns on Sept 28, 2007 10:52:00 GMT
Minivan, Please forgive time it is taking to do exchange on your Solo. The "season" looks like it has started already and we're having to pull-in helpers to free us up All, I'm really looking forward to more comparisons between the Solo and other amps. I won't get upset with your responses - it actually helps me get a better understanding - please keep it constructive though. Thanks
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Post by PinkFloyd on Sept 28, 2007 10:55:04 GMT
The "season" looks like it has started already and we're having to pull-in helpers to free us up If you're stretched let me know man, I'd be happy to put a few greens together. Mike.
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Post by minivan on Sept 28, 2007 11:17:54 GMT
graham: it's ok, take your time, i know u are busy man. i just thought i may receive it before the 10 of next month and bring it to our local headphone meet in melbourne, and then send it to dc for his sydney headphone meet. but if not, i will just made do with the current solo on hand, it still one hell of a kickass amp.
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leo
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Post by leo on Sept 28, 2007 11:43:06 GMT
Interesting leo. There's some comparisons with the Graham Slee Solo in there as well. Yes, I think that was an older Solo though wasn't it? Not much details about the Lehmann, it looks like dual supply, dual regulated op-amp stage with classA output
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Post by dc on Sept 28, 2007 12:26:27 GMT
leo: I think the BCL is a discrete design, methinks the opamp acts as a DC servo
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leo
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Post by leo on Sept 28, 2007 12:32:27 GMT
leo: I think the BCL is a discrete design, methinks the opamp acts as a DC servo Hmm, must have a read up about it to see if theres any details, personally don't like servo's, I always found they have more of a sonic signature than simple DC coupling caps, theres also making sure none of the op-amps noise is injected back into the circuit
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Post by minivan on Sept 28, 2007 12:46:27 GMT
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Post by Deleted on Sept 28, 2007 12:56:24 GMT
dc and Leo Going by the photos, it has an OPA2134 followed by some T0-220 style power transistors for the output stages (?) SandyK
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leo
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Post by leo on Sept 28, 2007 12:57:27 GMT
Have a read down the page www.head-fi.org/forums/showthread.php?t=133388The Black Cube Linear uses an opamp-based first amplification stage (I was told by the manufacturer that the chip is the OPA2134), followed by a discrete zero global feedback Class A output stage to amplify the incoming signals. Its shielded mains transformer sits in a compartment at the back of the chassis; the neatly-designed PCB sits in front.
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leo
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Post by leo on Sept 28, 2007 12:58:22 GMT
dc and Leo Going by the photos, it has an OPA2134 followed by some T0-220 style power transistors for the output stages (?) SandyK Yes, I agree, also going by what looks like input coupling caps which is why I didn't think it used a servo
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Post by dc on Sept 28, 2007 13:26:20 GMT
man you guys are good, i have no idea what's going on looking at those photos
isn't it similar in a way to the heed canamp then? opamp based voltage gain then a class A transistor based output?
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leo
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Post by leo on Sept 28, 2007 13:27:45 GMT
man you guys are good, i have no idea what's going on looking at those photos isn't it similar in a way to the heed canamp then? opamp based voltage gain then a class A transistor based output? I thought it looked more like a compact regulated Chiarra tbh ;D But basically yes, your right
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leo
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Post by leo on Sept 28, 2007 13:32:02 GMT
BTW ignore boring farts like me, I just like to have an idea whats going off inside these amps just to give an idea what your getting
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