PMD-100 options?

Skorpio · 9th May 2009, 03:17 PM

Hi,

Has anyone been testing the Dither modes on the PMD-100?

It is used with PCM63P in my setup. It should be easy to implement a switch "Dither on/off" according to the datasheet?

How does dither sound, and why is it typically NOT used?

gmarsh · 11th May 2009, 02:47 AM

I don't think you need it if you're using a 20 bit PCM63P, but if you're using the PMD100 to feed 16-bit DACs I'd probably use it.

Rigging a PMD100 to turn dither on/off should be pretty simple to do - tie the DITH pin one way with a resistor, and switch it the other way with a toggle switch or something. Then put on some music and toggle the switch back and forth and see what you prefer.

Skorpio · 11th May 2009, 07:48 AM

Yes, that was my idea...to have a switch to judge by....

I just wondered why noone other had tried this?

philpoole · 11th May 2009, 09:38 AM

I have one for my TDA1541A DAC. I admit I haven't really played with it. Very quickly tried it once, and I'd say the difference is subtle.
I might go and have a play and see if I can hear anything less subtle

Skorpio · 11th May 2009, 12:13 PM

While the PMD-100's dither is non-adjustable, the PMD-200 offers a choice of several dither modes from none to maximum. In addition to having different gross magnitudes, the dither modes also use different algorithms to produce their dither. We ran in the factory default of minimum dither. (The no dither mode is disrecommended for listening purposes by Pacific Microsonics.) Comparing the different available dither modes would be an interesting future experiment.

http://www.jeffchan.com/audio/filter-comparison.html

Skorpio · 11th May 2009, 12:15 PM

Taken from below link:

"While the PMD-100's dither is non-adjustable, the PMD-200 offers a choice of several dither modes from none to maximum. In addition to having different gross magnitudes, the dither modes also use different algorithms to produce their dither. We ran in the factory default of minimum dither. (The no dither mode is disrecommended for listening purposes by Pacific Microsonics.) Comparing the different available dither modes would be an interesting future experiment. "

http://www.jeffchan.com/audio/filter-comparison.html

gmarsh · 11th May 2009, 06:26 PM

The PMD100 has adjustable dither if you run it in software mode.

Skorpio · 11th May 2009, 06:27 PM

In trying to implement dither in my Rotel RCD-971, I just realized that the player har dither as standard

Pin 4 on PMD-100 is connected to 5V via 10k resistor....

So I guess I still have haven't heard PMD-100 WITHOUT dither

philpoole · 12th May 2009, 10:09 AM

Hi,
Well, I tried with or without dither on mine last night (feeding dual TDA1541A) and I have to say it was immensely subtle, if noticable at all.

I think I *might* have heard a better soundstage, or more detail, but I could also be kidding myself.

Cheers,
Phil

guido · 12th May 2009, 05:41 PM

I'm running in sw mode and can switch between the various modes. I cannot recall that i've heard a difference too. Depends on the rest of the chain, including my ears.

But i could measure a difference.

Witout dither.

9th May 2009, 03:17 PM	#1
Skorpio diyAudio Member Join Date: Mar 2004 Location: Denmark	PMD-100 options? Hi, Has anyone been testing the Dither modes on the PMD-100? It is used with PCM63P in my setup. It should be easy to implement a switch "Dither on/off" according to the datasheet? How does dither sound, and why is it typically NOT used?

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11th May 2009, 02:47 AM	#2
gmarsh diyAudio Member Join Date: Apr 2004 Location: Halifax, NS, Canada	I don't think you need it if you're using a 20 bit PCM63P, but if you're using the PMD100 to feed 16-bit DACs I'd probably use it. Rigging a PMD100 to turn dither on/off should be pretty simple to do - tie the DITH pin one way with a resistor, and switch it the other way with a toggle switch or something. Then put on some music and toggle the switch back and forth and see what you prefer.

11th May 2009, 07:48 AM	#3
Skorpio diyAudio Member Join Date: Mar 2004 Location: Denmark	Yes, that was my idea...to have a switch to judge by.... I just wondered why noone other had tried this?

11th May 2009, 09:38 AM	#4
philpoole diyAudio Member Join Date: Oct 2004	I have one for my TDA1541A DAC. I admit I haven't really played with it. Very quickly tried it once, and I'd say the difference is subtle. I might go and have a play and see if I can hear anything less subtle

11th May 2009, 12:13 PM	#5
Skorpio diyAudio Member Join Date: Mar 2004 Location: Denmark	While the PMD-100's dither is non-adjustable, the PMD-200 offers a choice of several dither modes from none to maximum. In addition to having different gross magnitudes, the dither modes also use different algorithms to produce their dither. We ran in the factory default of minimum dither. (The no dither mode is disrecommended for listening purposes by Pacific Microsonics.) Comparing the different available dither modes would be an interesting future experiment. http://www.jeffchan.com/audio/filter-comparison.html

11th May 2009, 12:15 PM	#6
Skorpio diyAudio Member Join Date: Mar 2004 Location: Denmark	Taken from below link: "While the PMD-100's dither is non-adjustable, the PMD-200 offers a choice of several dither modes from none to maximum. In addition to having different gross magnitudes, the dither modes also use different algorithms to produce their dither. We ran in the factory default of minimum dither. (The no dither mode is disrecommended for listening purposes by Pacific Microsonics.) Comparing the different available dither modes would be an interesting future experiment. " http://www.jeffchan.com/audio/filter-comparison.html

11th May 2009, 06:26 PM	#7
gmarsh diyAudio Member Join Date: Apr 2004 Location: Halifax, NS, Canada	The PMD100 has adjustable dither if you run it in software mode.

11th May 2009, 06:27 PM	#8
Skorpio diyAudio Member Join Date: Mar 2004 Location: Denmark	In trying to implement dither in my Rotel RCD-971, I just realized that the player har dither as standard Pin 4 on PMD-100 is connected to 5V via 10k resistor.... So I guess I still have haven't heard PMD-100 WITHOUT dither

12th May 2009, 10:09 AM	#9
philpoole diyAudio Member Join Date: Oct 2004	Hi, Well, I tried with or without dither on mine last night (feeding dual TDA1541A) and I have to say it was immensely subtle, if noticable at all. I think I might have heard a better soundstage, or more detail, but I could also be kidding myself. Cheers, Phil

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