Sead
Member of the Trade: Sony Mobile
- Joined
- Oct 27, 2012
- Posts
- 19
- Likes
- 29
Quote:
Great for sharing this, achieving controlled leakage with MH1 is not an easy task. However, if tuned carefully they can give an impression of the bass being tighter ...Warmth and depth due the sub-bass being leaky will be lost, but for those looking for some faster bass this could be a way to go... if i get some more time i''ll try to provide some measurements on how MH1 reacts on the front leakage.
Quote:
Yes, MH1c are still in production.
Right, it's part of the acoustical tuning... Actually, the mesh is one that is responsible for the most of the attenuation in mid- lower treble area, with kind of a U-shape impact. Foam on the other hand do not have so much influence on the overall sensitivity, it rather works as a "smoothing" filter for the upper mids and treble area. Anyhow, there are always trade offs, in this case i chose to prioritize overall smoothness and sub bass boost... It's true that MH1 needs some juice to really shines through, and they might be on the edge with some smartphones especially those with a high output impedance, but they should work fine with the most external amps.
I very much like the results after I drilled very small holes in the supplied silicone sleeves. You may have to click on the above image to see the holes in the enlarged photo. (The story is continued from here: http://www.head-fi.org/t/594945/6-panasonic-rp-hje120-surprisingly-usable/15#post_8854187. Basically, I played with the cheaper Panasonic RP-HJE120 before deciding how to change the sound of the MH1C.)
I ended up making four tiny holes per tip--still a bit bassy, but I didn't want to overdo it. With this "mod", the bass response now more closely matches what I hear from live music. The timbre of musical notes has been improved since the proportions of the fundamental and the harmonics is in better balance. After some time with a tone generator and matching the volume, I can tell that (for my ears at least) the response above 1 kHz hasn't changed much.
I normally use a parametric EQ like Equalizer or Accudio, but many apps like Pandora, YouTube, and Netflix can't use them. The punctured tips have the potential to match the huge bass reducer filter that I use on the MH1C. They actually sound pretty good now. The time domain characteristics aren't completely independent of the magnitude response, so I would guess that the transient response has been improved also. I'd love to see impulse response and CSD measurements on these things after EQ or after using these tips.
Isolation isn't as good after the change, but I'd rather trade that for better spectral balance. Also, driver flex during insertion has been greatly reduced. The technique also worked for the HJE120, but I can see it working for any bassy IEM, e.g., UE100, Klipsch S4, etc.
If we can find a way to get controlled leakage from foam ear tips, we may be able to neutralize the sound of v-shaped IEMs.
I forgot the size of the drill bit, but I started with the smallest #80 wire gauge bit and went down from there. A #75 is still too small. With the one pictured above, it took many passes of the bit through the hole, and in both directions before I got the opening of the desired size. I had considered other ways of puncturing the sleeve, like using a needle tip with a soldering iron, but I never got to try them because the drill worked well enough.
Great for sharing this, achieving controlled leakage with MH1 is not an easy task. However, if tuned carefully they can give an impression of the bass being tighter ...Warmth and depth due the sub-bass being leaky will be lost, but for those looking for some faster bass this could be a way to go... if i get some more time i''ll try to provide some measurements on how MH1 reacts on the front leakage.
Quote:
To Sead:
I was wondering, are MH1C still in production or are we just buying from some large stock, that will in some time run out?
Yes, MH1c are still in production.
'.' to you too!
Ironically, now the argueing has abated, the thread has died a bit.
I'd like to ask a question to Sead; is there another material that can be used to tune earphones that doesn't attenuate the entire spectrum as much as the foam in these?
The reason I ask is my only gripe with the MH1C is how power hungry they are and just wondered if there is an alternative material.
Thanks in advance.
It's part of the tune. as efficiency goes up by less filter, the response evenness likely suffers and the efficiency difference wont be very great and still related to the driver's original design parameters as well. You likely traded some efficiency for bass response. I'm surprised at how often the inefficiency is commented on as I think it's more than fine and see it as a non issue.
Some of the tuning may be unseen at the driver opening to the nozzle. It's likely small enough to offer some resistance tuning of it's own. Perhaps Sead could comment.
Right, it's part of the acoustical tuning... Actually, the mesh is one that is responsible for the most of the attenuation in mid- lower treble area, with kind of a U-shape impact. Foam on the other hand do not have so much influence on the overall sensitivity, it rather works as a "smoothing" filter for the upper mids and treble area. Anyhow, there are always trade offs, in this case i chose to prioritize overall smoothness and sub bass boost... It's true that MH1 needs some juice to really shines through, and they might be on the edge with some smartphones especially those with a high output impedance, but they should work fine with the most external amps.