MASS-Kobo Headphone Amp. model404
Apr 4, 2015 at 4:05 AM Post #16 of 98

seeteeyou

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Seeteeyou, did you get yours already?

 
It's already shipped on Wednesday but the online tracking didn't show any changes at all since Thursday
 

2015/04/02 02:42    国際交換局から発送        中部国際郵便局    愛知県

04/02/2015 02:42    Dispatch from outward office of exchange        CHUBU INT    AICHI

 
It's Rudi's birthday tomorrow as well as Easter Sunday, hopefully he's getting his own 404 soon but mine should arrive on Tuesday since Monday will be a public holiday here.
 
Apr 14, 2015 at 2:43 AM Post #19 of 98

seeteeyou

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Rudi posted his impressions on Facebook and it's a winner
 
https://www.facebook.com/photo.php?fbid=1626652204222718
https://www.facebook.com/photo.php?fbid=1626487900905815
https://www.facebook.com/photo.php?fbid=1625848030969802
https://www.facebook.com/groups/headfi.org/permalink/10153324810054736/
https://www.facebook.com/groups/headfi.org/permalink/10153323723859736/
https://www.facebook.com/groups/headfi.org/permalink/10153323512144736/
https://www.facebook.com/groups/headfi.org/permalink/10153323512139736/
https://www.facebook.com/groups/headfi.org/permalink/10153319860429736/
https://www.facebook.com/groups/headfi.org/permalink/10153319658769736/
https://www.facebook.com/groups/headfi.org/permalink/10153318874739736/
https://www.facebook.com/groups/headfi.org/permalink/10153275351839736/
https://www.facebook.com/nekosan69/posts/881133751947390
 
Lunch Time Set Up
 
Source :
AK 240 ss
 
Amp :
Mass Ko Bo 404 full balance portable amp
 
Headphone :
Audeze LCD XC
 
Cable :
Stephan Audio Art Endorphin balance 4 PIN
For Single Ended 
IC Crystal Cable Standard Diamond
 
For Balance 
2 DHC balancd short adqpter female RSA to TRRD Male
1 RSA to RSA Male balance
 
Sound Quality :
Running SE with Volume Knob at 9 o clock can produce very loud and excellent SQ
 
Running Balance Trrs to Trrs 
Wooow thats blown my head 
Like in big concert hall .
Very excellent Bass impact .slam and speed.
Mid very clear and sweet
High has very good rendering
 
This set up has best synergy with my LCD XC
 
Mass Ko Bo 404 SQ and Power is more like desktop set up 
This is portable version from their TOTL Desktop Amp Mass Ko Bo 394.
 
IMO

 
Apr 14, 2015 at 12:47 PM Post #20 of 98

b0ssMax

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At a hotel.

Seeteeyou, got yours? Wanted to ask a few q about your unit.

Basically, would you know if i can plug in usb ext charger while there're are (rechargeable batteries inside?
The instructions showed that the trrs bal 2.5mm input is different from the output trrs configuration. Is it the same wih your unit?

Some random shot....

 
Apr 14, 2015 at 1:48 PM Post #21 of 98

seeteeyou

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At a hotel.

Seeteeyou, got yours? Wanted to ask a few q about your unit.

Basically, would you know if i can plug in usb ext charger while there're are (rechargeable batteries inside?
The instructions showed that the trrs bal 2.5mm input is different from the output trrs configuration. Is it the same wih your unit?

 
Yes, it's delivered last Friday.
 
According to the instructions, we need batteries that are providing 5V / 1A (i.e. at least 5 watts) in order to power the amp up. Check the manual of your batteries and most likely we'll have at least 1A unless it's a really old one.
 
Sometimes the batteries might not be deliver precisely 5.0V since that particular value could fluctuate just a little bit. The bare minimum should be 4.6V as mentioned in the manual:
 

 
If the voltage were 4.6V or above, the power indicator on the upper-right corner should be in green color.
 
If the voltage were below 4.6V, the power indicator on the upper-right corner should be in red color and that's NO GOOD.
 
Basically stick with brand name batteries and they should be fine with the appropriate power requirements. Stay away from generic ones that are really cheap because they might even explode or something.
 

 
If you don't mind spending more for much better batteries and carry them with you, here are some options
 
http://jplay.eu/jcat/#manual2
http://stereodesk.com/products/the-bakoon-bps-02
http://www.moon-audio.com/kingrex-u-power.html
 

 
Masuda-san sent everyone an e-mail and asked each owner to specify the balanced input / output type respectively.
 
He gave us 4 choices and I picked the last one:
 
Input = AK240 2.5-mm
Output = AK240 2.5-mm
 
AK240 2.5-mm should look just like this, T / R / R / S = R- / R+ / L+ / L-
 
5504676ff0a12.jpg
 
 

 
I only have the TRRS plugs from Nakamura but no cables yet, my only source with balanced output is AlgoRhythm Solo -dB but I can't test my 2.5-mm balanced connections without a cable.
 
My LCD-X worked fine with XLR balanced output and I was feeding the amp with the single-ended output of Tera-Player. The amp was able to convert single-ended input into balanced output successfully.
 
Apr 18, 2015 at 3:51 AM Post #22 of 98

rudi0504

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Thank you Frankie for sharIng
Now I use Note 4 , i don't know how to post big pictures to Head Fi
 
Apr 25, 2015 at 6:54 AM Post #26 of 98

b0ssMax

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Using ak240 --> whiplash 2.5 bal --> mass ko bo 404 --> jvc fxz-200 (using 3.5 hp out)

Liking it. No hiss.

I don't think i've yet had 50 hours on the amp

Highs, mids and lows are tight. Mids are a bit lacking only a bit but i believe thats from the jvc's.

Haven't used the jvc's for quite a while but it's now reminding me why i've kept it.

I also had an option to choose between 8 wire silver or gold coated silver. Chose the silver for the details.
 
May 2, 2015 at 5:29 PM Post #27 of 98

Angular Mo

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Is there an English language Web site?

I could be interested in the unbalanced version.

Though AA batteries?
 
May 2, 2015 at 6:03 PM Post #28 of 98

seeteeyou

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Just a few pages in English so far
 
http://www.masskobo.com/e/sale-e/m404.htm
http://www.musicaacoustics.com/#!mass-kobo/c1h3x
http://www.jaben.com.hk/?product=mass-kobo-model-404
https://www.facebook.com/JabenHK/posts/918919078128548
https://www.facebook.com/JabenSG/posts/10152666431041782
https://www.facebook.com/JabenSG/posts/10152670198596782
https://www.facebook.com/eggheadph/posts/941632869220592
 
395 here
 
http://www.masskobo.com/e/sale-e/m395.htm
http://www.soundwave.co.id/products/mass-kobo-395
http://www.jaben.com.hk/?product=mass-kobo-model-395
 
May 3, 2015 at 1:38 PM Post #29 of 98

seeteeyou

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Voltage accepted should be between 9V ~ 7.2V with 6 pieces of AA batteries
 
http://www.masskobo.com/j/sale-j/m404.htm
 
消費電流(無信号時) :0.13A(電池9V時)、0.14A(電池7.2V時)、0.21A(USB 5V)
(最大出力時) :0.27A(電池9V時)、0.33A(電池7.2V時)、0.7A(USB 5V)
 
ozTBl4L.jpg

dVHlp5f.jpg

 

 
14500 batteries are rated between 4.2V ~ 3.7V so combining 2 pieces of 14500 batteries (8.4V ~ 7.4V) and 4 pieces of battery place holders (0V) should give us:
 
4.2 + 0 + 0 + 0 + 0 + 4.2 = 8.4V (highest)
3.7 + 0 + 0 + 0 + 0 + 3.7 = 7.4V (lowest)
 
8.4V ~ 7.4V
 
http://www.nitecore.com/productDetail.aspx?id=43
http://www.amazon.com/Nitecore-NL147-14500-Battery-750mAH/dp/B00906E83A
 
yxgXkph.jpg

2 pieces of 14500 batteries
 
x5N7MNF.jpg

4 pieces of battery place holders

RXZPDQc.jpg
 
6 pieces will yield between 8.4V ~ 7.4V and that's staying between 9V ~ 7.2V
 
May 29, 2015 at 8:41 PM Post #30 of 98

sfoclt

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Originally Posted by seeteeyou /img/forum/go_quote.gif
 
Masuda-san sent everyone an e-mail and asked each owner to specify the balanced input / output type respectively.
 
He gave us 4 choices and I picked the last one:
 
Input = AK240 2.5-mm
Output = AK240 2.5-mm

 
Do you remember the other options?
 
Are the other options still possibilities or was one configuration settled upon?
 

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