[jonstatt]

Aesthetic bliss

 

[Kiats]

Here we are...

 

[Kiats]

I was really enjoying the C9 and it's driving power until I switched to tube... as you can see the tube on one side doesn't come on thereby only there's music only on one channel. Sigh...

@Andykong pretty disappointing to wait a couple of months on pre-order and then it fails... Now I have to wait yet again...

 

[zen87192]

A simple little fix for me to do today. Noticed after a few hours of use the C9 and N6ii became warm.
So I affixed four small self adhesive clear rubber pads on each unit to lift the N6ii up and to the bottom of the C9. This allows air movement to the two units and also protects the units from scratching each other.
In addition, this prevents small movements when stacked causing the units to slip off. It's ideal and now I can listen without worrying about the slightest of movements bringing the units crashing down.

 

[bluestorm1992]

I was really enjoying the C9 and it's driving power until I switched to tube... as you can see the tube on one side doesn't come on thereby only there's music only on one channel. Sigh...

@Andykong pretty disappointing to wait a couple of months on pre-order and then it fails... Now I have to wait yet again...

Ah that’s sad. Can you try switching modes or to charge it and see if the tube comes back?

 

[Kiats]

Ah that’s sad. Can you try switching modes or to charge it and see if the tube comes back?

I did. Switched modes and back again. It never came on. I was listening on solid state. Decided to try tube. And one channel was completely dead.

Singapore stores are out of stock again. Who knows when new stock will arrive... But bitterly disappointing experience... Obviously, I shouldn't assume all have been properly QCed all because my Cayin N8 has served me well .

 

[RTodd]

I did. Switched modes and back again. It never came on. I was listening on solid state. Decided to try tube. And one channel was completely dead.

Singapore stores are out of stock again. Who knows when new stock will arrive... But bitterly disappointing experience... Obviously, I shouldn't assume all have been properly QCed all because my Cayin N8 has served me well .

Something must have come lose in transit.
Surely Cayin is doing QC testing before packing. Wonder if it could just be pushed back in?

 

[Whitigir]

So, the protection and charging circuits are all within the battery tray. It uses TI chips at minimal required implementations specifically to balances and regulate output of 8.2 or 8.4V rails

Following is the data sheets for this Chip
https://www.ti.com/lit/ds/symlink/bq77915.pdf?ts=1616026050607&ref_url=https%3A%2F%2Fwww.ti.com%2Fstore%2Fti%2Fen%2Fp%2Fproduct%2F%3Fp%3DBQ7791501PWR

The current discharge for the tray seems to be 6A and anything drawn over 8A will shut it down. Given that the C9 never been shut down, it simply means that the current being used and drawn by the C9 is always less than 6A

The back of the C9 also indicates that 9V/5A is the max requirements

For all of this mentioned, I doubt that building any LPSU will be beneficials as the 18650 packs can have burst power so fast without noises.

So, based on this finding, people who seeks for batteries performances should consider a few facts

1/ brands (chemicals will have specific influences on the discharge) and that will influence the sounds. By far Panasonic and Sony are great, no Samsung or Sanyo. Hi-IMR

2/ mAh, the higher is the longer that it last

3/ CDR rate can be anything higher than 7A (now this will open up a lot more possibilities) rather than going for the highest CDR (high drain) situations

4/ The lower Internal resistances is the better

These are just based on the finding of the chip, the implementations and the data sheets

 

[Whitigir]

Also found that this Chip has reverse voltage protections, over current/voltage in charge and discharge, load detections and so on

So basically if the Tray does not see the load from the amp, then it will not discharge and the amp will not turn on. This throw and assumption that using an external LPSU can be tapped directly into the correct supplied terminals and have the amp turn on ?

Keep in mind that both of these posts are from visual inspections and nothing from an engineered databases or schematics

 

[bluestorm1992]

I did. Switched modes and back again. It never came on. I was listening on solid state. Decided to try tube. And one channel was completely dead.

Singapore stores are out of stock again. Who knows when new stock will arrive... But bitterly disappointing experience... Obviously, I shouldn't assume all have been properly QCed all because my Cayin N8 has served me well .

I think it shouldn’t take that long this time. The delay last time was due to both CNY and an unexpectedly high demand for the first batch. Now that Cayin has all the parts they need, this shouldn’t take that long.

 

[Whitigir]

I think it shouldn’t take that long this time. The delay last time was due to both CNY and an unexpectedly high demand for the first batch. Now that Cayin has all the parts they need, this shouldn’t take that long.

There are still chips shortage problems global wise

 

[bluestorm1992]

There are still chips shortage problems global wise

Yeah, but my understanding is that Cayin has ordered enough parts not just enough to full fill the backorders but more. Will need @Andykong to provide more info and/or to help that user out.

 

[Jeffyue]

Time for new toy....
Think it helps me to bring out SP1K & DPX1 from the drawer....


Touchwood so far so good, but wanna check on one thing.

I played with the tray and battery before I started, and found that after plugging the tray back to the unit I needed to plug in the USBC charging cable before I could start the unit.
Is it the way the protective circuit of the tray to work please?

 

[bluestorm1992]

Time for new toy....
Think it helps me to bring out SP1K & DPX1 from the drawer....


Touchwood so far so good, but wanna check on one thing.

I played with the tray and battery before I started, and found that after plugging the tray back to the unit I needed to plug in the USBC charging cable before I could start the unit.
Is it the way the protective circuit of the tray to work please?

Congrats! And yes I believe that’s the way the tray is supposed to work, but others please provide more info on this.

 

[Andykong]

I was really enjoying the C9 and it's driving power until I switched to tube... as you can see the tube on one side doesn't come on thereby only there's music only on one channel. Sigh...

@Andykong pretty disappointing to wait a couple of months on pre-order and then it fails... Now I have to wait yet again...

Sorry to know that your C9 is not working properly, please contact your dealer and have this exchange. Zepp is a very helpful dealer, I am sure he'll take care of you and we'll expedite the process to shorten your wait.

Yeah, but my understanding is that Cayin has ordered enough parts not just enough to full fill the backorders but more. Will need @Andykong to provide more info and/or to help that user out.

Don't worry, we have stock in our inventory.