Bottom of post #1 has nick n's mod which involves plastidip IIRC.
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Fostex T50RP Incremental Mods and Measurements - Page 63post #931 of 23093/4/14 at 10:52am
Gear mentioned in this thread:post #932 of 23093/4/14 at 10:56am
I have one mod where I sprayed a tar sealant into the cups...
It improves the seal between the cups and baffle, maybe helps damp out a tiny bit of vibration, but ugh for the effort required and the mess it creates... very diminishing returns on this one.post #933 of 23093/4/14 at 2:32pmpost #934 of 23093/4/14 at 3:01pmpost #935 of 23093/5/14 at 12:28am
There is no one material to damp all frequencies. So have to work with 3 different materials to get this result.
Similar to acoustic filters on BA drivers. Using some filter on the front of driver smooths the FR (Bumps & cavities).post #936 of 23093/5/14 at 12:43ampost #937 of 23093/5/14 at 4:04amThread Starter
Very nice work, MuZo2. I'm happy to see you and others are using measurements to help dial-in modifications.
Are you planning on sharing any of the details about your measurement kit (phantom power circuit, type of mic, sound card) and damping scheme? Many people will be interested...including me.
Thanks!post #938 of 23093/5/14 at 4:07amThread Starter
To my "ears and gears" yes.
I made this mod to see if I could do it without destroying the diaphragm and snap tabs = Success.
I have been busy with many other projects and put damping/measurements on the back burner. I will eventually get back to it and share what I learn.
Thanks for the interest.post #939 of 23093/5/14 at 4:48amQuote:
Sure will do.
Mic is wm61a with 9v phantom powersupply. I think I used same circuit like you.post #940 of 23093/5/14 at 10:55ampost #941 of 23093/5/14 at 12:50pmThread StarterQuote:
I tried John Conover's tube-to-baffle with rubber bands setup. It works but I prefer the "In my own ear" (IMOE) method. Here's why:
1. I made all FIMMs with this method.
2. I have made well over 1000 measurements with this setup, in addition to FIMM, so IMOE works best for me.
3. Standardization is paramount for "within measures" comparisons...i.e. comparing measurements of headphone "A" to headphone "B"; comparing tweak 1 with tweak 2, etc. To optimize standardization, the following variables must be controlled and replicated each time a measurement is made:
a. the same mic placement ---> depth and angle
b. the same placement/position of the headphones on a dummy head (Mine!)
c. the same clamping pressure ---> rubber bands are difficult to match and they become weak as they stretch with use. Over time and after making many measurements, rubber bands will likely lose their elasticity, resulting in less clamping pressure and unwanted error variance.
d. ensuring a good seal all the way around the headphone pads to head
4. The IMOE method provides "biomarker feedback" not offered by other methods, including:
a. Tactile, proprioceptive, and kinesthetic feedback
b. The "feel" of my preferred headphone placement on my head helps me obtain the same position from one measurement to the next.
c. The "feel" of the mic inserted into my ear tells me if I have the same depth and angle used in previous measurements.
d. The pressure of the headphones on my head tells me that I have a good seal around the pads and the same clamping force as previous measurements.
5. Whatever method a person may chose, try to standardize it as much as possible. With repeated measures comes experience. With experience comes more accurate measurements and a finer understanding of how your kit and software works. This knowledge is necessary for meaningful interpretation of your measurements.
6. Remember that "one guy's" measurements cannot be directly compared to "another guy's" measurements.
7. A measurement kit is only a tool.
8. Measurements do not necessarily equate with SQ due to a boat load of objective and subjective variables, including:
a. individual hearing acuity
b. personal preferences
c. music file type
e. both positive and negative expectation bias
f. hearing fatigue
h. your energy level
i. your "ears and gears"
Cheerspost #942 of 23093/5/14 at 12:56pmpost #943 of 23093/6/14 at 2:08ampost #944 of 23093/6/14 at 9:59ampost #945 of 23093/6/14 at 10:13am
- Fostex T50RP Incremental Mods and Measurements
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