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K701 burn in trick?

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bmbrown911 View Drop Down
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    Posted: 14 Jul 2010 at 6:09am
I've seen on here in one post that graham did something when burning in the K701s that had to do with a radiator or something. Can graham or someone else elaborate?
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Graham Slee View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Graham Slee Quote  Post ReplyReply Direct Link To This Post Posted: 14 Jul 2010 at 8:02pm
I placed them above a hot radiator - not on the radiator though and don't get the headphones too hot to touch or they may be damaged.

When I got the HD800 a few weeks ago the weather was quite hot so I placed them on the dashboard of my wife's car (don't do this if you park on a public road!!!) and that was just about as warm as I dare take them.

A few hours of warmth will let the plastic diaphragm (and other moving parts or even earpads) "relax" as there will always be moulding and manufacturing stresses introduced in such parts. Anyway, it seems to work. I first tried this on the HD250 II and it helped greatly improve their performance quickly. I had previously tried the usual burn-in tip of playing a constantly looping source to them but it didn't seem to do much all that quickly.


Edited by Graham Slee - 14 Jul 2010 at 8:03pm
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bmbrown911 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bmbrown911 Quote  Post ReplyReply Direct Link To This Post Posted: 14 Jul 2010 at 11:13pm
How long did you do this for exactly?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote oldagetraveller Quote  Post ReplyReply Direct Link To This Post Posted: 15 Jul 2010 at 7:50am
Graham offered similar advice to me recently, but an airing cupboard was recommended then along with near a domestic heating radiator.
I placed my new headphones in an airing cupboard overnight and I think I noticed a difference for the betterThumbs%20Up.
Clarification for non U.K. members if the term is not familiar - an airing cupboard is the space where a domestic hot water cylinder is located, usually with shelves above to store towels etc.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bmbrown911 Quote  Post ReplyReply Direct Link To This Post Posted: 15 Jul 2010 at 7:53am
So basically just anywhere that puts out a lot of heat then. Will have to give this a try. Thanks!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Graham Slee Quote  Post ReplyReply Direct Link To This Post Posted: 15 Jul 2010 at 8:29pm
The test houses (such as IEC, CSA, UL, BS) reckon on 40 degrees being the max test temperature on many domestic items, therefore I'd not exceed that.

As for the amount of exposure to warmth I can only say: as long as it takes to obtain a noticeable improvement.

With a pair of Canford DMH285's I got a few months ago nothing has happened yet, but with steel cables I think I need to do a rewire...
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Post Options Post Options   Thanks (0) Thanks(0)   Quote John Willett Quote  Post ReplyReply Direct Link To This Post Posted: 30 Jun 2011 at 1:37pm
Interesting - I have never heard of the radiator trick.

The designer of the HD 800 recommended running them for 48-hours with pink noise at a normal listening level (just put them over the box, don't stretch the headband).

It's to do with the glue settling in to it's final position he told me.

I hear that the K701 need 500 hours plus, though.  I hear they sound pretty horrible new, but sound great as they burn in.

John Willett

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