![]() I'm hesitant to do any mods, because I don't see any that modify only the area of the bass that is problematic. I insert the mh1 mid ear now, so it reduces treble peaks well and I just eq the bass down. However, you need a lot more eq to really flatten the earpods without resistance, etc. The mh1 is just smoother and more level end to end. Interesting.Īnyhow, the mh1 sounds a lot flatter to me than the earpods without modification, although they aren't bad. I checked a graph and the bass is where all of the distortion is with the earpods. I came to the conclusion that the bass just didn't sound good for some reason. ![]() I always felt the treble of the earpods was distortion free and better than the pfe (distortion wise), but that the sounds was funky somehow. The irony is that I located where the distortion was before even looking at graphs. I tried the earpods and while I was impressed for a while, once I started hearing the distortion of my pfe112 and knew what to look for, I can't really listen to the earpods anymore. I don't listen loud enough for the distortion to be a problem. BTW, the Apple IEM has a sound that's in the same ballpark as a bass-reduced MH1 if you add series resistance with a passive inline volume control and Comply Whoomp tips. I don't hear that on the MH1 at any insertion depth, even though you can see something that looks like it on Sead's graph in post #211. Linkwitz also notes the half-wavelength resonance at 7-10 kHz, which can be addressed by very deep insertion or an absorbent tip like a TX-100. I'm hearing the ER4S pretty much the same as Linkwitz there's a peak near 2.5 kHz compared to my various sets of speakers. The way I'm hearing it, the presentation in the upper midrange is different from the ER4S. I'll have to try that trick on some other cheapo IEMs, e.g., Philips 3580. Since you need more excursion for those really low bass notes, reducing the volume (and thus the acoustic compliance) means that you'll get less bass as well. Air is a compressible fluid, and if there's less of it behind the driver, the harder it is to move the diaphragm. It seems that Rin found a pretty good solution to the excessive bass problem: he decreased the volume of the rear air chamber. To me that's less musical damage than the other way around. But I'm the kind of person who insists on getting the mid-range and mid-bass right, even if it means that the response is down a few dB at 30 Hz. I found a good compromise by keeping the vent small. It'll graph even worse if you go by Sean Olive's compensation or believe in the missing 6 dB effect. If you make the vent large enough for the mid-bass to be flat (around -10 dB at 100 Hz), you'll hear a very audible roll-off in the bottom octave. It's not perfect because the deep bass response is the first to go. I didn't have a bunch of disposable MH1 samples, so I went with the micro-punctured sleeve instead (this was well before Rin's analysis). Basically, he drilled a front hole and controlled the leakage with various Knowles dampers. There are graphs of its effect on Rin Choi's blog. The frequency response of my "mod" should be similar to that of a dedicated front vent. I'll have to check these forums more often.
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