Moonwalker
100+ Head-Fier
- Joined
- Oct 23, 2001
- Posts
- 367
- Likes
- 17
Hi!
Some time ago, i tried APureSound mod, link here: http://apuresound.com/hdsennmod.html
It's about 4 or 5 months now, now I have some time to write about how I perceived sound changes regarding the individual mods.
Internal foam removal: resulted IMO in weird/bad look and, most importantly, the sound became unpleasantly reduced imaging precision, the coherent soundstage was damaged, by a fairly large degree, I was definitely happier when I put the oval foams back in.
Rear, outer foam removal: I was perceiving cleaner bass, wider soundfield, but only at elevated volume, at my normal listening levels the change was not noticeable for me. I listen mostly around 70 dB average. Main negative came from looser, slower (I hate this word, sorry) bass, and increase in bass level around 120 Hz. The sound was now bass heavy, and not in a good way. Again, this was problem only at higher volume. Instead, i put denser, thicker foam back in the proper place. Circle diameter as original, with 8 shallow cuts on the perimeter to better fit and accomodate the ribs around it. It compressed the soundstage width a little, and the bass became less prominent, more controlled and evened out - as usual with better dampening. The difference is very small, but definitely step in the right direction, for me. It is more noticeable on my Onkyo receiver HP out with its high 120 Ohm impedance, much less on ZAMA HP amp, which has almost 0 Ohm output impedance.
Metal grille substitute: Looks absolutely great on HD 580 IMO, gives it better appearance than the HD 600 overall. No sonic advantages emerged, or at least I was not able to detect them. As a double check, I measured sweep sine wave distortion with plastic and metal grille, it was almost the same. I prefer original plastic grille, it's uglier, but impossible to dent in my travel bag, or when more people are using them, I'm less afraid that the grille paint would be damaged, or (disaster!) the metal grille would return dented.
Last thing, the HD 650 cable: I found almost no difference, maybe I only convinced myself I was hearing more lower- and midbass. But the difference was subtle at most, maybe nonexistent. Measuring test tones revealed no difference either.
So, this is my short story after long time
Do your experience differs? Please write about it!
Thanks
Moonwalker
Some time ago, i tried APureSound mod, link here: http://apuresound.com/hdsennmod.html
It's about 4 or 5 months now, now I have some time to write about how I perceived sound changes regarding the individual mods.
Internal foam removal: resulted IMO in weird/bad look and, most importantly, the sound became unpleasantly reduced imaging precision, the coherent soundstage was damaged, by a fairly large degree, I was definitely happier when I put the oval foams back in.
Rear, outer foam removal: I was perceiving cleaner bass, wider soundfield, but only at elevated volume, at my normal listening levels the change was not noticeable for me. I listen mostly around 70 dB average. Main negative came from looser, slower (I hate this word, sorry) bass, and increase in bass level around 120 Hz. The sound was now bass heavy, and not in a good way. Again, this was problem only at higher volume. Instead, i put denser, thicker foam back in the proper place. Circle diameter as original, with 8 shallow cuts on the perimeter to better fit and accomodate the ribs around it. It compressed the soundstage width a little, and the bass became less prominent, more controlled and evened out - as usual with better dampening. The difference is very small, but definitely step in the right direction, for me. It is more noticeable on my Onkyo receiver HP out with its high 120 Ohm impedance, much less on ZAMA HP amp, which has almost 0 Ohm output impedance.
Metal grille substitute: Looks absolutely great on HD 580 IMO, gives it better appearance than the HD 600 overall. No sonic advantages emerged, or at least I was not able to detect them. As a double check, I measured sweep sine wave distortion with plastic and metal grille, it was almost the same. I prefer original plastic grille, it's uglier, but impossible to dent in my travel bag, or when more people are using them, I'm less afraid that the grille paint would be damaged, or (disaster!) the metal grille would return dented.
Last thing, the HD 650 cable: I found almost no difference, maybe I only convinced myself I was hearing more lower- and midbass. But the difference was subtle at most, maybe nonexistent. Measuring test tones revealed no difference either.
So, this is my short story after long time
Do your experience differs? Please write about it!
Thanks
Moonwalker
