RE-ZERO iem mod. Will it work?
Jul 24, 2010 at 9:23 AM Thread Starter Post #1 of 6

Kibble Fat

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Hello everyone,
 
I've been looking for a pair of higher end headphones that are detailed and neutral.  The RE0 was a logical choice.  When I realized the RE-ZERO was available, it got me interested in trying a balanced setup.  While I do want to keep its balanced capability in tact, I also want a cleaner adapter solution for unbalanced use. 
 
I introduced this idea in an RE-ZERO thread but got no feedback - so here is a new DIY thread
biggrin.gif

 
The adapter that comes with the most recent edition of the RE-ZEROs is a 3-inch jobbie shown below:

 
What I want to do is do away with the adapter completely.  My idea was to add a small on-off switch close to the RE-ZERO's plug between the two "negative" wires.  The paint rendering below should clear thing up.


 
Any thoughts?  Would using the short length of only one "negative" wire by the plug be too much of a bottleneck for audio signal?
 
Thanks for your help!
 
Eric
 
Jul 25, 2010 at 9:49 AM Post #3 of 6

Kibble Fat

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What I’m asking is, for devices that are set up for 4-conductor mini use, is using only one of the negative wires enough?  An example is my 6G ipod which uses the middle ring for the microphone signal.
 
Here is the max amperage table presumably from the American Wire Gauge website:
 
AWG gauge Conductor
Diameter Inches
Conductor
Diameter mm
Ohms per 1000 ft. Ohms per km Maximum amps for chassis wiring Maximum amps for
power transmission
Maximum frequency for
100% skin depth for solid conductor copper
OOOO 0.46 11.684 0.049 0.16072 380 302 125 Hz
OOO 0.4096 10.40384 0.0618 0.202704 328 239 160 Hz
OO 0.3648 9.26592 0.0779 0.255512 283 190 200 Hz
0 0.3249 8.25246 0.0983 0.322424 245 150 250 Hz
1 0.2893 7.34822 0.1239 0.406392 211 119 325 Hz
2 0.2576 6.54304 0.1563 0.512664 181 94 410 Hz
3 0.2294 5.82676 0.197 0.64616 158 75 500 Hz
4 0.2043 5.18922 0.2485 0.81508 135 60 650 Hz
5 0.1819 4.62026 0.3133 1.027624 118 47 810 Hz
6 0.162 4.1148 0.3951 1.295928 101 37 1100 Hz
7 0.1443 3.66522 0.4982 1.634096 89 30 1300 Hz
8 0.1285 3.2639 0.6282 2.060496 73 24 1650 Hz
9 0.1144 2.90576 0.7921 2.598088 64 19 2050 Hz
10 0.1019 2.58826 0.9989 3.276392 55 15 2600 Hz
11 0.0907 2.30378 1.26 4.1328 47 12 3200 Hz
12 0.0808 2.05232 1.588 5.20864 41 9.3 4150 Hz
13 0.072 1.8288 2.003 6.56984 35 7.4 5300 Hz
14 0.0641 1.62814 2.525 8.282 32 5.9 6700 Hz
15 0.0571 1.45034 3.184 10.44352 28 4.7 8250 Hz
16 0.0508 1.29032 4.016 13.17248 22 3.7 11 k Hz
17 0.0453 1.15062 5.064 16.60992 19 2.9 13 k Hz
18 0.0403 1.02362 6.385 20.9428 16 2.3 17 kHz
19 0.0359 0.91186 8.051 26.40728 14 1.8 21 kHz
20 0.032 0.8128 10.15 33.292 11 1.5 27 kHz
21 0.0285 0.7239 12.8 41.984 9 1.2 33 kHz
22 0.0254 0.64516 16.14 52.9392 7 0.92 42 kHz
23 0.0226 0.57404 20.36 66.7808 4.7 0.729 53 kHz
24 0.0201 0.51054 25.67 84.1976 3.5 0.577 68 kHz
25 0.0179 0.45466 32.37 106.1736 2.7 0.457 85 kHz
26 0.0159 0.40386 40.81 133.8568 2.2 0.361 107 kH
27 0.0142 0.36068 51.47 168.8216 1.7 0.288 130 kHz
28 0.0126 0.32004 64.9 212.872 1.4 0.226 170 kHz
29 0.0113 0.28702 81.83 268.4024 1.2 0.182 210 kHz
30 0.01 0.254 103.2 338.496 0.86 0.142 270 kHz
31 0.0089 0.22606 130.1 426.728 0.7 0.113 340 kHz
32 0.008 0.2032 164.1 538.248 0.53 0.091 430 kHz
 
And here are the specs for the RE-ZERO:
 
16 Ohm impedance
Sensitivity: 100db/1mw
Rate input: 10mw
Maximum input: 30mw
 
I roughly calculated currents for the rated and max power which are 0.025 A and 0.033 A respectively.  These are both below the recommended max currents however I am not sure what wire gauge the RE-ZERO has.
 
Eric
 
Jul 27, 2010 at 9:10 AM Post #5 of 6
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Don't see why it wouldn't work. The trouble might be finding a small switch that is sufficient quality and is easily installable.
 

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