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Has anyone implemented this modification on a Denon CD player, or specifically the DCM-370?I am wondering if the crystal is compatible? Elso (Kwak-Clock designer) says that he does not have specific experience with this model.
If someone has used this tweak, what were the sonic results?
Thank you,
Tim
Follow Ups:
I'm trying to figure out how to add this to my Denon DCM-270 too. The schematic is easy, order a service manual. There are a few places online who can sell it to you, I think I got mine from www.pacparts.com. The manual appears to have both the 270 and the 370 in it.Anyway, about the 3 crystals - the 270 has 3 of them too, and only one of them is 16.9344 MHz and connected to the DAC, so I'm assuming that's the one. On both schematics, that's X101. From the parts list, the other two crystals are 12 MHz and 8 MHz.
On the 270/370, there's a big IC called the 'DSP' in the block diagram, which is a CXD2500BQ. The Xtal is connected between pins 53 (XTAI) and 54 (XTAO) of this IC. The Xtal pins also have 2 capacitors (similar to the diagram on the LC Audio website) on them, and then both pins together are connected to pins 52 (VSS), 59 (MD2), and further away, to something that's labelled DGND, which I assume means digital ground? The Xtal end connected to XTAO also goes to the DAC (PCM1716) on pin 5 (XTI0, and pin 6 (XTO) seems to be floating.
Here are my questions:
Should I use the modified clock just for the DAC, or for the DSP also? In other words:
* Option 1: Lift the connecteion to the DAC, take 2 connections from the Xtal to a PCB, implement the Kwak-clock there, and feed the output back to the line that goes to the DAC.
* Option 2: De-solder the Xtal and the capacitors completely (similar to the LC Audio instructions), put the Xtal on the PCB and build the Kwak-clock, and then feed the output (and ground) back to the CD player. This seems confusing, because there's XTAI and XTAO on the DSP, but only one output from the Kwak-clock PCB, so how would I hook it back up? The diagrams on the LC Audio website have a resistor connecting XTAI and XTAO, but my schematic doesn't have one.
Thanks,
Saurav
Hi saurav,
It is the 16.9344 MHz crystal you need to desolder and mount onto the KWAK-CLOCK PCB. The output of the KWAK-CLOCK goes to pin 53 of the DSP(CXD2500). XTAI is short for crystal Input. The two small caps originally connected to the crystal should be removed. Yes they were connected to digital ground with the other end.
XTAO is the crystal output and should be left connected to the DAC(PCM1716). Dont worry about the resistor connecting XTAI & XTAO. It should be removed if present.
Hope this helps.
ELSO
OK, so the crystal feeds the DSP, which then feeds the DAC, so the output of the improved clock circuit goes to XTAI. That makes sense. What about the fact that one end of the crystal was connected to XTAO, and won't be connected there any more. Is that a non-issue?
Hi Saurav,
Yes that is a non issue. Alternatively you could also feed the DAC directly with the output of the KWAK-CLOCK but in this case you have to break the connection between XTAO and the DAC; and splitting up the output of the KWAK-CLOCK as you must have a connection to pin 53 of the DSP too.
ELSO
Hi Jayel,
If the crystal is in the range 8 to 24.576 MHz it will work in the KWAK-CLOCK, whatever the type of the crystal is. Hope this helps.
ELSO
The main PCB in the Denon DCM-370 has three crystals. How can one determine the correct one to replace with the Kwak-Clock circuit?Does anyone have a schematic for this player, or know a place to get one?
Thanks.
The page I gave you also gives you the installation instruction for the kwak-clockjayel
Have a look at this sitehttp://www.audiocom-uk.com/new/Instructions/superlock.htm#general
If you read the page, it'll tell you the possible values of the crystal. The crystal that matches the one on the list is the crystal that needs replacing.
Jayel
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