Quote: I am almost certain it is a tube issue. The standard testing procedure for us is to test the unit with a 32 Ohm sennheiser PX100 headphone, to make sure there is absolutely no background noise within the comfortable listening volume. Although we did aging the unit for 48 hours...

Quote: Didn't get your email. Please notice we have lost our original domain name. I've just sent you a message of my new email.  

Why don't you just send me an email and we can discuss this possibility   Quote:

  Quote: Unlike digital circuit design, analog circuit design sometimes is very unpredictable.  You have to perform a lot different testings in order to archive the best result. For example, the voltage of the tube, the value of certain resistors and capacitors, tube working mode and...

Hi Dylan,   Can you go to my web site to submit a support ticket, and I will arrange a replacement unit for you. Based on what you've described,  I suspect it is either the tube or something else get damaged during the transportation and certainly I would love to exchange another unit for...

Hi Dylan,   Thanks for  your detail explanation of the issue. I agree with you, there seems to be two separate issue with your A1, the speaker amplifier part is okay, the issues are just related to the headphone output. Issue 1: Background hum/noise.   A1 should not produce any...

  Quote: Yes I completely agree with you. All the comments are extremely helpful for us in order to improve the product. Without help from the community there will be no today's D1 and A1.  

  Quote: Thanks for pointing this out   I think my previous explanation is not complete. The hum is very much related to the design of the tube circuit, the power transformer and a lot of other small things in the unit. For example, you can make the tube work in "buffer mode" which it...

  Quote: It is normal you get a bit "hum" pass 12 o'clock. It is from the vacuum tube, not from the circuit.  Depends on different pair of tubes, you might not get any hum until 3-4 o'clock position. Vacuum tubes are vintage analog components, each tube is a bit different. There is really...

  Quote: Hey Dylan, the problem you had before (right channel not working) is obvisouly caused by the tube was moved during transportation. Don't worry, let me try to sort out the new issue:   - You mentioned you use the DAC/A1 combo with your laptop. What kind connection did you...

Quote: We have just shipped quite a few units in the last few days.  You can expect to see more customer reviews or real customers to answer you this question really soon :)  

Quote: Thanks Spanky for the notice. I've moved all the content on the original site to the new domain name.  Customers will need to go to the new site to get product and support info.

Hey Ultrainferno,   Let me try to answer your questions:   1) D1 will be good enough for most headphones out of box. You don't need to open the case of D1 to do modification:) 2) The best connection method will be:   CD -- via optical or coaxial cable --> D1 --  via analog RCA...

Quote: Originally Posted by Integrins This is probably a very stupid question, but can you use the headphone amp part if you remove the tube? Heck, is it safe to power up without the tube?? Yes you can do that. By removing the tube, the only thing it will affect is the tube pre...

Quote: Originally Posted by djnagle Thanks Ryan, but can you address the very loud zip and zing I get when swichin from USB and Optical...for example. I get it when I change from any input to another. D1 uses pure hardware switch in the audio signal selection circuit. The noise...

Quote: Originally Posted by Mysteek I'm so confused Should I pretend it's new and do my own psychological burn in? Haha. Give it some more burn-in time. You never know how long the previous owner really used the unit. And D1 does require some time to get full "burn-in".

Quote: Originally Posted by djnagle Also, inbetween movie previews the thing pops and crackles which it does not do when I use the RCA from my DVD/CD player to my amps without the D1 in line. What the heck is going on with the D1. Is anyone else having these issues. D1 will shut...

Quote: Originally Posted by Crookshank Using the digital inputs or line in both outputs will work? Both tube pre out and normal solid state output will work simultaneously. You can select your audio source ( digital inputs or line-in) by using the audio source switch.

Quote: Originally Posted by sfrancis Thanks for the confirmation. BTW, on their web site, it mentioned that any order before Feb 5 (Friday) will be shipped out soon otherwise we will have to wait after Feb 20 due to Chinese New year holiday. I wonder if it's too late now ? (it's...

Quote: Originally Posted by sfrancis How does this DAC/amp pair with HD650 ? Do I need another amp between this and HD650 ? Thanks D1 has enough power to drive HD650. I have no problem using my HD650 with D1, and you don't need another amp in between.

Quote: Originally Posted by doctorcilantro Anyone tested WASAPI with this DAC? ryan says some interfaces may cause it to get capped at 44-48kHz. I'd like to use WASAPI in J. River MC14. Anyone using MC14 or care to download the trail and test it? thanks! DC D1 will work...

Quote: Originally Posted by _Spanky_ Booyah! Is this extra step going to be removed in the newer batches? i.e. socket soldered first? Sure, once we have used all the stock PCB board

Quote: Originally Posted by _Spanky_ You bring up a good point, I hadn't thought of that. I'm thinking now that the opamps were soldered directly onto the board, desoldered, socket installed and then put into the socket. You are right. They are soldered onto the board first (...

Quote: Originally Posted by Legis Mave's sound has very good clarity with both outputs and bass weights a ton but it still manages to put out good resolution. Sound is full, present and has the size of Ronnie Coleman in year 2005. All this even with quite young piece (10h listening)...

Quote: Originally Posted by DannyBuoy At some point in learning about audio (very general statement I know) I had to take the plunge and actually try different settings, devices, tweaks, etc. myself and A/B it and make a judgement myself on the results. Once I did this I started to get...