What the hell is this?
The future!
So here is what I did. First I got the new Fiio Q5
http://www.fiio.net/en/products/83
Instead of the line out (on top of the Q5) I decided to use the balanced headphone out and imho it sounds better than line out. I had a custom made TRRS cable from Headphonelounge (Ted Allen). I made a DIY ground only cable (copper). So now I got balanced in and out. You might say this is double amping and technically it is, but also pretty much the same thing that AK calls line out. But given the high input impedance of the CDM, the Q5 outputs at essentially no load so at the best measurements.
Now why go through all the trouble if I have a SP1000 I could use? With Q5 I get:
- Coax input (using in desktop mode with coax from my SU-1)
- Optical input
- Apt-X (yes! Q5 is a BT RECEIVER and connects to your source via Apt-X and AAC for iOS)
Can't do any of the above with the SP1000 and quite frankly, I'm really too lazy having to connect/un-connect my SP1000 to the CDM all the time. I also found the USB DAC feature of SP1000 mediocre. It was much better just as a DAP. Q5 is no different - USB is so so, but coax is so much better if you have top notch DDC like an SU-1.
But my biggest surprise is how good the Aptx and AAC bluetooth connection sounds! I tried my iPhone and Aptx from my Android tablet. Fiio's Q5 has the decoded BT stream bypassing the BT codec and going straight to the 2 x AKM4490 DACs.
The overall sound to me is analog/organic with better extension high and low compared to built in DAC. Reminds me a lot of my AK380Cu. Q5 has a touch more mid bass than I like so I changed the CDM tubes back to Telefunken 5719 and that pairs great.
Couple more notes:
- The charging port is on the left side of the Q5 so it does not get in the way of the top and bottom ports. You can still use the usb port on the bottom for both charging and data. It is covered up with my cables in the photo. I don't intend to use the usb for data.
- At the moment, coax and optical do not support DoP. Not sure if that's a hardware limitation. USB works fine for DoP.
- No EMI issues from bluetooth in an hour of testing.
- Q5 has an iOS app that lets you select different filters for the AKM4490 DACs. Wish AK would implement that!
- You could also take the line out of the CDM to the line in of the Q5 and have a solid state balanced amp! Or just use the Q5 stand alone for that LOL.
- Q5 does not have wifi so no DLNA.
- Q5 has a bass boost option.
I ordered a Q5 promotional package directly from Fiio but I think the US resellers should have them by mid Feb and MSRP is $359. I consider that a pretty good price to upgrade the CDM DAC to a modern design with a lot of ways to connect it.
Pretty happy with this combo and has given new life to my CDM!
Note - the large black volume knob is an upgrade I made because I find the original too small and gets too hot, and volume level marker is upside down if you have the tube window facing up (and who wouldn't position that way?).