Low volume - please assist - Solved !

[op6980]

Hi all,
I have just finished building my Crack and was satisfied by the resistance/voltage checks, so I went on and plugged in my HD600...

In the forum, I saw that there is a problem with high volume ?!
I am experiencing the opposite - low volume problem.

Terminal Resistance
6 0K ohms - (after "Oops moment" modification)
7 2.98K ohms
9 2.98K ohms
10 0K ohms - (after "Oops moment" modification)
B3 2.98K ohms
B6 2.98K ohms

Terminal Voltage (VDC)
1 86
2 163
3 0
4 163
5 78
6 0
7 105
8 0
9 102
10 0
11 0
12 0
13 163
14 0
15 184
20 0
21 205
A1 77
A2 0
A3 1.57
A4 0
A5 0
A6 81
A7 0
A8 1.56
A9 0
B1 81
B2 163
B3 104
B4 77
B5 163
B6 102
B7 0
B8 0

Can you Please advise ?

 

[Paul Birkeland]

What source are you feeding your Crack?  Your voltages look good, is everything else stock?

 

[op6980]

Thank you for your quick reply, Caucasian Blackplate.

Actually, I am waiting for my ODAC+RCA Cable to be delivered, so for now I have some really old RCA Cable and my source is Samsung Galaxy S4 headphone output.

Can it be that the RCA cable cause the low volume ?
I though the crack suppose to amplify the input, whatever it gets ?!

 

[Paul Birkeland]

The Galaxy S4 has about a 0.3V output.  Most sources will be 1.5V to 5V. (Redbook standard is 2V, which is what your ODAC will put out)

The Crack does amplify the input, your input is simply abnormally low.

 

[op6980]

The Galaxy S4 has about a 0.3V output.  Most sources will be 1.5V to 5V. (Redbook standard is 2V, which is what your ODAC will put out)

The Crack does amplify the input, your input is simply abnormally low.

Spot on !
S4+ODAC+HD600 = wonderful.