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RE-ZERO iem mod. Will it work?

post #1 of 6
7/24/10 at 6:23am
Thread Starter 

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

 

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

RE-ZERO adapter

 

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.

RE-ZERO KF mod

Nankai RE-ZERO pinout

 

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


Edited by Kibble Fat - 7/24/10 at 6:24am
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post #2 of 6
7/24/10 at 10:52pm

Electrically speaking, it is one negative wire, but it will be the same as any commercial headphone cable out there (2 positive and 2 shared grounds).  A small SPST switch should do the job.

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post #3 of 6
7/25/10 at 6:49am
Thread Starter 

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


Edited by Kibble Fat - 7/25/10 at 6:55am
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post #4 of 6
7/27/10 at 4:53am
Thread Starter 

bump?

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post #5 of 6
7/27/10 at 6:10am

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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post #6 of 6
10/29/10 at 8:43pm

honestly, i dont mind the little adapter with my re-zero's.  it makes the cord longer which i like and i think it looks cool.  makes it look like the cable is higher quality i think.

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