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Posts by alphaman

I vote this as the most-useful post in this thread ;)
Thx .... I found the "Crowd-Designed" thread shortly after I posted my above query .... not sure how much of the stuff shown in the images actually made it on to final hold-in-your-hand product you get after the lascivious unboxing ... but I stole this from that thread ...  ... but these threads are far too long and complex for a simpleton like moi to wade thru ... I'm still waitin' for the decoder/FPGA and other "important"  component lists.    Also, a HUGE criticism...
Many modern manufs. of similar products (e.g., HiFiMan, Colorfly), have an open-book policy as far as which chipset and/or opmaps they are using. For AMR Audio (UK) products like iFi, I'm having a hard time finding these "Manufacturer specs" either on iFi's official web site, e-zine reviews or forum threads/blogs... ...so ... what's the big mystery ... what's under the hood? We can start with "its special Dual-Core Burr-Brown native DSD/PCM chipset at the heart"......
It also says this:"...Email by email, thought by thought, these suggestions make the born of UD120. " Poetry ... lyrics to an opera or  song ... well, maybe the UD120 "sings" music better ... 'cause if Stoner was commissioned to write for my opera company, I'm firing the librettist! Make the born ... Make The Born ... MAKE THE BORN .... nah, not quite ;)
Since you, bluemonkeyflyer, seem to be interested in modifying the FR curve of the AKG, why not set a goal ...say emulating the notably flat curve of the Philips Fidelio X1... (above from Tyll's IF)   It'd be interesting to see/hear how deliberate curve flattening helps and/or hurts other aspects of AKG stock sound. E.g., dynamics, "speed", slam, punchiness, etc. Another possible approach to modding the AKG might be experimenting with the side "vents" covered with...
Just going over some of Tyll's comments, at IF, WRT sealed vs. open. Specifically, he noted that for pro use, important diffs between the sealed Focal Spirit Professional vs. "open" HD800. Not sure the HD800's driver is sealed or ported (like the AKG of this thread).  I don't own a sealed set (any model) at the moment. So maybe those of you who do can comment on sealed sound (disregarding the isolation issue, of course) vs. open-back.   Another thing to explore might be...
It's important to note that while metrics (objective data/graphs) may, indeed, improve as a result of various mod(s), the actual subjective sound may not correlate to those changed metrics. E.g., flattening of the freq. response may not appeal to all ears (as the ever-controversial diffuse field vs. free field results indicate). One particular subjective (controversial) quality is PRAT. I find that even 'phones that display a clean/impressive impulse response may not, in...
In traditional loudspeaker design, acoustic suspension (i.e. non-reflex or non-port or no passive rad. or transmission line) gives tight but wimpy bass. Whereas, reflex/ported/etc. gives more powerful (deeper/punchier) but not-as-accurate bass.I don't know the specifics of the k701's actual driver -- but there is a topical h-f driver thread, with some good info and pics.... Also note that way back in June 2012, in the 701 vs. 702 thread, MDR30 noted (about the above diver...
While the change in elasticity (compliance) of that tape stuff may contribute minorly to burn-in improvement, it's removal (partial or full) seems to perform an entirely different acoustic function: increase bass. The burn-in for the k701, IME, qualitatively reduces glare/brightness and improves image focus. Those contributions come from changes in mechanical compliance of the main drivers as well as, perhaps, the "breaking in" of the wiring/coils/electricals.
Hmm...and only a smaller diameter of it covers the actual port hole. In dynamic loudspeakers, a type of similar implementation is called a passive radiator (sort of a dummy driver) : Anyone with a zest to experiment care to use some other material?? .... say rubber-balloon latex. Or create a tuned/damped system, again borrowing from speaker design....... using, maybe, the filter from a cigarette? A transmission-line system is used in some "tuned" loudspeaker designs, like...
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