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- Aug 20, 2014
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- Tascam DM 24
Hi guys, I read that a lot of people like me has clock problems regarded to tascam mixer, so I created this discussion to collect the various testimonies and maybe solve the problem.
I don't know why but maybe it seems regarded to some circutry solution in several tascam product because I read about two other people with the same ramdom crackles in tascam digital cabled studio.
The important thing is to differentiate the problems. I noticed that there are two main problems. One regarded to the firewire slot of the dm24 and the other, that is the worst, regarded to the mixer clock itself.
The first problem is directly related to the old driver, caused because the product in discontinued. In OSX 10.9, you can see that the mixer is detected as a general audio device witouth any specific driver and if you record a track it could be noisy. I noticed the is related with the responsiveness of the graphics interface (for example if you scroll a pdf file while you listen music it glitches), so is directly related to an inefficient use of dma and other strategies to remove cpu response latency. It's normal with an old driver so the only thing you can do is use a 2408 or something similar and forget the old internal firewire card.
The second problem is the worst because I noticed that is indipendent to daw and it is the problem that interests me the most and we have to solve. With all firewire disconnected, so withouth pc, i connected two adat fiber (mixer to motu, motu to mixer) between the dm24 and a full working 828mk2. You can make a test configuration routing an analog signal with cuemix. So I configured the system as shown.
External audio signal -> motu -> cuemix the signal to adat -> adat to tascam -> make something on the mixer and out master on adat -> adat to motu -> cuemix signal to monitors.
With this setup you can check your connections without pc. I test several clock configuration:
-routing signal WITOUTH any sync : random and periodic glitches, This is normal because the clock of mixer and motu Is always a little bit different
-routing signal sync with adat sync: random and per glitches (obviously less than before) but this is very strange!
-routing signal sync with word clock: (75ohm termination both on or off) same problem. And this is very strange too!
I tried 48khz and 44.1khz. The problem is more evident in 48khz.
I tried to change clock phases, same problem.
That is very frustrating, with my old 03D I never had this problem.
Now I'm checking the clock of tascam with an oscilloscope so I'll tell you the conclusion later.
Write here if you have similar problems.
PS. an interesting technical post in this forum (http://www.tascamforums.com/threads/tascam-dm-24-power-supply-fail.136/) regard the PSU fail of the mixer that is the first thing I checked. In my case it seems working well.
I don't know why but maybe it seems regarded to some circutry solution in several tascam product because I read about two other people with the same ramdom crackles in tascam digital cabled studio.
The important thing is to differentiate the problems. I noticed that there are two main problems. One regarded to the firewire slot of the dm24 and the other, that is the worst, regarded to the mixer clock itself.
The first problem is directly related to the old driver, caused because the product in discontinued. In OSX 10.9, you can see that the mixer is detected as a general audio device witouth any specific driver and if you record a track it could be noisy. I noticed the is related with the responsiveness of the graphics interface (for example if you scroll a pdf file while you listen music it glitches), so is directly related to an inefficient use of dma and other strategies to remove cpu response latency. It's normal with an old driver so the only thing you can do is use a 2408 or something similar and forget the old internal firewire card.
The second problem is the worst because I noticed that is indipendent to daw and it is the problem that interests me the most and we have to solve. With all firewire disconnected, so withouth pc, i connected two adat fiber (mixer to motu, motu to mixer) between the dm24 and a full working 828mk2. You can make a test configuration routing an analog signal with cuemix. So I configured the system as shown.
External audio signal -> motu -> cuemix the signal to adat -> adat to tascam -> make something on the mixer and out master on adat -> adat to motu -> cuemix signal to monitors.
With this setup you can check your connections without pc. I test several clock configuration:
-routing signal WITOUTH any sync : random and periodic glitches, This is normal because the clock of mixer and motu Is always a little bit different
-routing signal sync with adat sync: random and per glitches (obviously less than before) but this is very strange!
-routing signal sync with word clock: (75ohm termination both on or off) same problem. And this is very strange too!
I tried 48khz and 44.1khz. The problem is more evident in 48khz.
I tried to change clock phases, same problem.
That is very frustrating, with my old 03D I never had this problem.
Now I'm checking the clock of tascam with an oscilloscope so I'll tell you the conclusion later.
Write here if you have similar problems.
PS. an interesting technical post in this forum (http://www.tascamforums.com/threads/tascam-dm-24-power-supply-fail.136/) regard the PSU fail of the mixer that is the first thing I checked. In my case it seems working well.
