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matt49's picture
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RE: Audiolab MDAC Appreciation and tweaking

For anyone interested in M-DAC mods, I've just posted a note on my modded unit in the your system thread

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Hello old thread

I am wondering about the M-DAC. I have a Chord Mojo with me at the moment but not sure about it. It has a few issues and so I was googling to see if the M-DAC has any.

This is what the Mojo does wrong:

It misses the first second of music sometimes. It happens when you change album or skip about in the tracks. Oddly it doesn't do it all the time. The reason the Mojo does this is because it is programmed to mute for a second when changing sampling frequency. Like changing from HD-audio to SD-audio. However there is more trouble. It happens as said even on the same album. It transpires that the Mojo mutes for a second also when the music player (e.g. JRiver) stops berielfy. It sees a break from say 44.1KHz to silence or no music input. Then when it starts playing again it sees 44.1KHz and mutes the first second.

Secondly the Mojo has just stopped playing on me three times in succession once. Then once about a five days later. The lights are still on, music is still being sent, but there is silence.

Basically does the M-DAC create a mute.

I also have the Meridian Explorer DAC and it works flawlessly. It never drops a mute in when switching albums or tracks of the same sampling frequency.

It tested it changing to music with different sampling frequency. The Meridian Explorer inserts a second of silence and then starts playing the music once it has adjusted. It doesn't do what the Mojo does and simply mute the first second.

PS A note for people using the M-DAC not on the USB input. If you a want asynchronous input, on the optical input. You could use a DAC like the Medridian Explorer to feed an optical asynchronous input to the M-DAC.  The Meridian Explorer has three outputs; headphones, line-out, and optical out built into line-out. I email Meridian and they told me any signal coming out of the ME is clocked by the ME. Thus the optical out is.

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Help

Green Bow wrote:

I am wondering about the M-DAC. I have a Chord Mojo with me at the moment but not sure about it. It has a few issues and so I was googling to see if the M-DAC has any.

[...] Basically does the M-DAC create a mute.

I can't help you with your M-DAC query, but I know a man who can. John Westlake, designer of the M-DAC, is active on the Pink Fish Media audio forum and is very helpful. you could post your query on this thread.

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.

Why is the M-DAC connected to the Meridian or the Chord at all? They should connect directly to your PC.

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Vladimir wrote:

Vladimir wrote:

Why is the M-DAC connected to the Meridian or the Chord at all? They should connect directly to your PC.

As I understand it, his idea was that the Meridian doesn't cause a pause, and so inserting the Meridian before the Chord (or M-DAC) would be a kludge to solve the pause problem.

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matt49 wrote:

matt49 wrote:

Vladimir wrote:

Why is the M-DAC connected to the Meridian or the Chord at all? They should connect directly to your PC.

As I understand it, his idea was that the Meridian doesn't cause a pause, and so inserting the Meridian before the Chord (or M-DAC) would be a kludge to solve the pause problem.

I see. Thanks.

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@GB

Try this if you haven't. Download ASIO4ALL, install it, then have it selected instead of the Mojo ASIO driver.

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I had a QBD76 for a while.

I had a QBD76 for a while. Very twitchy performance and would crash on a regular basis when switching between sample rates. Maybe a Chord thing?

Turntable > Network Player > CD Player > Amplifier > Speakers

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Green Bow wrote:

Green Bow wrote:

I am wondering about the M-DAC. I have a Chord Mojo with me at the moment but not sure about it. It has a few issues and so I was googling to see if the M-DAC has any.

This is what the Mojo does wrong:

It misses the first second of music sometimes. It happens when you change album or skip about in the tracks. Oddly it doesn't do it all the time. The reason the Mojo does this is because it is programmed to mute for a second when changing sampling frequency. Like changing from HD-audio to SD-audio. However there is more trouble. It happens as said even on the same album. It transpires that the Mojo mutes for a second also when the music player (e.g. JRiver) stops berielfy. It sees a break from say 44.1KHz to silence or no music input. Then when it starts playing again it sees 44.1KHz and mutes the first second.

Secondly the Mojo has just stopped playing on me three times in succession once. Then once about a five days later. The lights are still on, music is still being sent, but there is silence.

Basically does the M-DAC create a mute.

I also have the Meridian Explorer DAC and it works flawlessly. It never drops a mute in when switching albums or tracks of the same sampling frequency.

It tested it changing to music with different sampling frequency. The Meridian Explorer inserts a second of silence and then starts playing the music once it has adjusted. It doesn't do what the Mojo does and simply mute the first second.

PS A note for people using the M-DAC not on the USB input. If you a want asynchronous input, on the optical input. You could use a DAC like the Medridian Explorer to feed an optical asynchronous input to the M-DAC.  The Meridian Explorer has three outputs; headphones, line-out, and optical out built into line-out. I email Meridian and they told me any signal coming out of the ME is clocked by the ME. Thus the optical out is.

I have an Arcam iPod dock/ dac that does this muting the first second of a track. Only happens with my iPod though, if I use my iPad in the dock it doesn't happen at all. I have the dock connected to a mojo. If I connect the iPod directly to the mojo it doesn't happen. Connected the dock directly to the amp still has the same issue so it is the Arcam. I eliminated the mute pause of the Arcam by using a different music app. If I use the onkyo hf app it doesn't mute at all.

Point is I think this is a source software issue conflicting with some dacs rather than an issue with the Arcam or mojo.

As for the mojo not working at all I read somewhere of someone having a similar problem. I think It turned out that some other software or alerts or something running in the background was taking over the audio output causing the loss of audio to the mojo.

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