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Audio-Gd Master 7 - Discrete Fully Balanced DAC (PCM1704) - Page 78

post #1156 of 3640
Quote:
Originally Posted by ALRAINBOW View Post

No is it suitable for all M7 dacs. ??

Why a new driver ?


Yes.

 

According to the Audio GD website there are a new USB-32 firmware and a new driver for 2014. It’s stated that they have improved the sound quality and less CPU requirement.

post #1157 of 3640
Ok
post #1158 of 3640
Quote:
Originally Posted by Steph86 View Post
 

Has anyone tried the 2014 usb 32 drivers yet? 

I’m very interested in this as well.

 

Just put an order to Kingwa for a Master 7 and ACSS cable to go with the Master 9.

post #1159 of 3640



post #1160 of 3640
Quote:
Originally Posted by ALRAINBOW View Post

 

Interesting. The ribbon is wired the same way/I think Kingwa changed the i2s to be OR5 compatible as a standard. Now i'm just confused, as Kingwa told me to contact other headfi-ers to figure out what changes I'd have to do.

post #1161 of 3640

Also, thank you for the pictures Alrainbow!

post #1162 of 3640
Oh do t say that I have an offramp and a custom cable to match it.
I told I needed the pin out and he did send me pics
I sent Those pics to Steve of imperical
Oh boy. Let me send you the pics I sent to Steve
Give me min. And no I have not tried it yet
LOL.
Al
post #1163 of 3640
Ok it works ya. I have to say this offramp just makes any DAC soooo much better.

Except my MSB

Al
post #1164 of 3640

Nice pix!  The wiring looks exactly like my M7 including 220 ohm termination resistors on the RJ45 board.  From Off Ramp to M7 DSP board header there are four I2S connectors involved and they are all wired or connected differently.  So keeping track required a spreadsheet.  As you see in the pictures that even the ribbon cable connector is wired differently at the M7 DSP board header.  I sent blitzxgene a PM earlier regarding cables but to try a standard Ethernet cable (not a crossover) you need to rotate the middle three connector pins at the DSP header ribbon cable connector.  Pin 4 wire goes to connector pin 2, pin 2 wire to connector pin 3 , and pin 3 wire to connector pin 4.  Pin 1 (GND) and pin 5 (MCLK) don't change.  And in Al's picture of the DSP board pin 5 is on the left and pin 1 the right.  Also the 5-pin mating connector shrouds are keyed with two slots so the ribbon cables attaches only one way.  You can though connect the ribbon cable reversed and it not work.  Al and I rotated the signals on the CAT cable side to affectively do the same thing.  If you need help don't hesitate to ask.   DACladder

post #1165 of 3640
Where are the four 220 ohm resisters located . Are they on the rj45 modual board . I did not notice lol. I thought they were under neither where the connector mounted to the main board with the moles connector.

Al
post #1166 of 3640

The are surface mount.  In you 2nd picture of the RJ45 board bottom.

post #1167 of 3640
Wow those are small , I did not look I just went to help the guy out. So we need 75 ohm so about 100 ohm across should be good then.
Thanks
Al
post #1168 of 3640

Since I have been listening to USB32 for that past week I download the new 2014 firmware and driver and it sounds pretty good.  I think it is promising indeed!!!!   BUT 192kHz files are silent using Foobar2000 WASAPI event.  Anyone else have this issue?  44.1khz, 96kHz, 176.4kHz file seem fine.  I'll send Kingwa a note. Thanks!

post #1169 of 3640
I can test in the morning and post

Al
post #1170 of 3640
Quote:
 Wow those are small , I did not look I just went to help the guy out. So we need 75 ohm so about 100 ohm across should be good then.

Now is a good time as any to fess up but I have been working on a HDMI port board for the Master 7 I2S input.  About the same size as the current RJ45 board.  Doing some tests on the bench and I blew up the Off Ramp I2S ports.  Don't worry... the Master 7 is not yet in the mix as I was just looking at signals on a scope at the workbench.   I was testing hot connecting the HDMI cable just to see how the little board reacted to a hot plug.  After all hot plug is in the HDMI spec.  Anyway in doing so I think I damaged the expensive Off Ramp I2S Hynes regulator and fried the I2S output driver chips.  I found out the hard way about hot plugging.   So you Off Ramp owners please turn off power before connecting any cables - RJ45 or HDMI.  That goes for connecting anything from now on.  The Off Ramp was sent back to Empirical Audio for a fix and haven't found out how much it will cost.

 

And with the above stated I don't recommend 75 ohm termination since it is a large load for standard LVTTL driver.  The current across 75 ohms calculates to about 44mA per output.  The normal max. current is 24ma.  And the RJ45 driver chip is powered by the same I2S Hynes regulator (if you upgraded) that fried on my Off Ramp.   I don't know what to suggest at this point.  I'm glad the new drivers came out for USB32 so at least I can make music.  Now my conscience is clean - no hot plug and be careful with 75 ohm resistors!       


Edited by DACLadder - 1/18/14 at 7:45pm
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