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Sennheiser HDVD800 Headphone Amplifier - Page 78

post #1156 of 2430

it was really nice of Mr. Grell to provide some detailed specs. The 43 Ohm impedance is a curiosity and in the end, I am relieved because it suggests minimum compromise in the circuit design (less feedback) even if that means incompatibility with lower impedance headphones.

 

When I said that -600 amp is a better value than the -800 model, I was referring to the prices here and for the 400 Euro difference, better DACs can be had though the combination may not be as compact.

post #1157 of 2430

get-attachment.aspx?uid=29687624&folder=%2fSaved%2fDagogo&partId=3 

get-attachment.aspx?uid=29687624&folder=%2fSaved%2fDagogo&partId=4 

 

 

Axel Grell sent me these power rating for my review. Very impressive numbers for a headphone amplifier for power. These will be published on the sennheiser website but I got permission to use the numbers here. 


Edited by Frank I - 6/28/13 at 8:52am
post #1158 of 2430

The image links are broken.

post #1159 of 2430

weird I can see the images on my screen here. 

 

 

ohm                      Power in Watts

 

 

16                        2.64

18                        2.72

32                        2.76

51                        2.50               

64                        2.33

150                      1.56

300                      0.96

600                      0.54


Edited by Frank I - 6/28/13 at 9:50am
post #1160 of 2430

I have a hunch it is because your images are in your aol email which you are linking to here on the thread.  Try downloading them to your computer then uploading to HF or another hosting site will probably work beerchug.gif

post #1161 of 2430

I just posted what was in the email and not sure why its doing that but funny on my imac at home I can see that post very clearly with the graphs

post #1162 of 2430
Quote:
Originally Posted by Frank I View Post

This is  from Axel Grell regarding some of the questions I had asked and his response from the Project manager himself regarding some design questions and  the output impedance which he told me was 43 ohms.

 

 

 

nced amplifier. The information that has been released so far is very vague. Is the USB a aschronyous design or it is not. 
** It is an asychronyous design using a xmos processor. 
 Other questions  I need for my review include the empower rating for the amplifier. How much power does it put into 32ohms,50ohms, and higher inputs like 300 ohms and 600 ohms.How many amplifiers are used in the hdvd800?   
** The output power into 600ohms is 480mW. The values for 32ohms, 64ohms, 150ohms and 300ohms will be available tomorrow. There are 4 amplifiers in the HDVD 800.

What is the input impedance of the amplifier. 
** It is 10k for the RCA input and 20k for the XLR input. The output impedance is 43ohms. 

 Internet articles from the Munich show suggested it was 43 ohms. Can you verify what all the specifications are?  People are concerned about the DAC issue. I have tried high resolution files from three or four vendors all different and mostly 24-176.4 DSD files and others up to 24-192 hz and they all are hissing and not playable. What is being done to fix this problem?.  Potential customers want to know why this problem is occurring on the hDVD800 DAC and not on other DAC's. My Oppo BDP 105 sailed through all the same files.. 
** We have tested HDVD 800 carefully before we relesed to the market. With the files we have used and the measurement equipment we never found this behaviour. But now customers send us 24-192kHz files wich produce a lot of noise with the HDVD 800. We have analyzed the files and found they contain a lot of hiss in the inaudible range close to the half of the sampling frequency. We are working on a new firmware that will solve this problem.


Great info, a couple of questions, sorry if that was addressed already earlier, it's a big thread to swim through.

- Does it support DSD (guess not but you mentioned some DSD files you played)

- And is amp section discrete or opamp design.

post #1163 of 2430
Quote:
Originally Posted by Andrew_WOT View Post


Great info, a couple of questions, sorry if that was addressed already earlier, it's a big thread to swim through.

- Does it support DSD (guess not but you mentioned some DSD files you played)

- And is amp section discrete or opamp design.


If they throw opamp into HDVD800, I will refund my money right away man~~~~~~~~

I am more curious about the solid state power supply~~~~ 

 

P.S.

Does anyone know someone on this planet  is crazy enough to open it up and post some pictures?\

post #1164 of 2430
Quote:
Originally Posted by AlanHell View Post


If they throw opamp into HDVD800, I will refund my money right away man

You obviously haven't looked inside your DAC1...wink.gif
post #1165 of 2430

Well,  I get it when they use opamp for portable devices. They need the space and power efficiency.

But a balanced desktop amplifier with what they claimed to have "four amps", putting opamp inside is like scamming~~~~~

If the amp section is not fully discrete, that just means their R&D department in the past few years are doing nothing but writing essays and sendin them to the marketing department for BS. I am sure for a big company like Sennheiser, this will not happen.

 

 

P.S.

I never used the amp on my dac before, and will never use them in the near future~~~~


Edited by AlanHell - 6/28/13 at 11:36am
post #1166 of 2430
Quote:
Originally Posted by AlanHell View Post

Well,  I get it when they use opamp for portable devices. They need the space and power efficiency.
But a balanced desktop amplifier with what they claimed to have "four amps", putting opamp inside is like scamming~~~~~
If the amp section is not fully discrete, that just means their R&D department in the past few years are doing nothing but writing essays and sendin them to the marketing department for BS. I am sure for a big company like Sennheiser, this will not happen.


P.S.
I never used the amp on my dac before, and will never use them in the near future~~~~

You use the amp in your DAC everytime you send an analog signal from your DAC1 to your headphone amplifier.
Edited by palmfish - 6/28/13 at 11:41am
post #1167 of 2430

Always good to hear that something has a full discrete output but just because something uses opamps in the design doesn't make it instantly inferior.

post #1168 of 2430
Quote:
Originally Posted by AlanHell View Post

Well,  I get it when they use opamp for portable devices. They need the space and power efficiency.

But a balanced desktop amplifier with what they claimed to have "four amps", putting opamp inside is like scamming~~~~~

If the amp section is not fully discrete, that just means their R&D department in the past few years are doing nothing but writing essays and sendin them to the marketing department for BS. I am sure for a big company like Sennheiser, this will not happen.

 

 

P.S.

I never used the amp on my dac before, and will never use them in the near future~~~~

Well...I'm a huge fan of a discrete design but a really good op-amp designed can sound pretty remarkable as well.  The April Eximus DP-1 also use op-amps on the DAC section and it sounds drastically more musical than the W4S DAC2.  The W4S's output stage is all discrete.

post #1169 of 2430
Quote:
Originally Posted by Andrew_WOT View Post


Great info, a couple of questions, sorry if that was addressed already earlier, it's a big thread to swim through.

- Does it support DSD (guess not but you mentioned some DSD files you played)

- And is amp section discrete or opamp design.

Roght now the dsd files are down sampled to 176.4 and no USB dac to my knowledge can play a dsd file through the USB without converting it to PCM. The DAC on the HDvd800 is hissing and noisy with all my DSD files. The firmware fix should address that.

post #1170 of 2430
Quote:
Originally Posted by AlanHell View Post

Well,  I get it when they use opamp for portable devices. They need the space and power efficiency.

But a balanced desktop amplifier with what they claimed to have "four amps", putting opamp inside is like scamming~~~~~

If the amp section is not fully discrete, that just means their R&D department in the past few years are doing nothing but writing essays and sendin them to the marketing department for BS. I am sure for a big company like Sennheiser, this will not happen.

 

 

P.S.

I never used the amp on my dac before, and will never use them in the near future~~~~

The hdvd800 is an op-amp design.   

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