... i had the pleasure to own the HD800S and the HD800 (stock and modded) ...Considering I measured, heard and reviewed the HD800SD before Tyll , i hadn't been influenced by his own conclusion about distorsion when I wrote my
review . My conclusion was I heard some small differences and mainly the very positive change in tonality thks to the tamed 6khz peak and resonnance . the only downside I heard was a slight lack of instrument separation during complex movements in orchestral music. I never heard that much warmth or lack of definition to be honest. Maybe a tad more extension ....
I appreciate your testing and viewpoints highly. (As well as your SD mod).
I gives me a great basis to look upon for comparisons..
.....
Measurements:
HD800S average FR with all raw takes
HD800S Average R and L
HD800S (yellow) vs HD600 (blue/green) vs HD800 (red) FR
Distorsion: (white for total THD, Red for 2nd harmonic,orange for third harmonic, yellow for 4th harmonic)
HD800S
HD800
CSD
HD800S
HD800
...
Here are mine:
HD800 to an HD800S mod:
FR:
notice elevated lower spectum to bass, and gradual elevated upper spectrum, no dips... previously impossible to have without the 6k ringing..
CSD:
Notice decay is faster than .5ms all way down to 1k, no 6kringing like stock and even 800S
Here is a screenshot of the best fabled never released annax mod:
At 50db down a slight 1-2ms decay in trebles, (cleanest ever made)
Now here is mine 50db down:
At a deep 50db down, a .05-1ms most delay in WHOLE trebles range is proof of no ringing(!)
Distortion:
notice harmonics below noise floor, also unique is the linearity of the harmonics.
In this one the ambient noise was too high, so the white line (THD) reflects that.
I removed further debatable points as this post not meant for that.
Bass measurements were too skewed because of the ambient noise so I will update in future thread.
One important point to note to make,
is that no other HD800 has ever had a linear distortion in the trebles range and below noise floor... ever..
This was the last HD800S Mod before I sold mine.
I have been planning to post this mod to the comunity when I have the time, which I finally have this week.
About this mod:
There was no mod to make an HD800 sound similar, but better than an 800S, so this was the goal.
This mod give you the bass without the added harmonics of the 800S.
This mod preserves the treble "air" and signature Senn trebles that other mods either kill off(rug liners & creatology foams) ..
Or neutralize (flatten or even out) with other mods,
In order to lessen the 6k resonance.
This is the only mod that eliminates the problem without killin or neutralizing the trebles...
I had bits and pieces of this mod scattered everyhere but will compile into one thread.
This is an all unique mod comprising of nobody else tweaks, liners, and was a year long project that me and another member @ Olegausa accomplished about over a year ago, so is about high time it gets revealed.
The measurements here are from his headphone.
Edit:
The intention with this post is not to make any drama.
Also not to make rediculous money upgrades with fancy worded websites, or hold onto secrets (there are actually) like done in past,
but to help the community to get the most out of the HD800.
The upgrades revealed will be up to the user to try.