Metrum Octave Dac - What are the Chips used - Page 5 - diyAudio
Go Back   Home > Forums > Source & Line > Digital Line Level

Digital Line Level DACs, Digital Crossovers, Equalizers, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 28th March 2012, 07:55 PM   #41
oshifis is offline oshifis  Hungary
diyAudio Member
 
Join Date: Mar 2004
Location: Budapest, Hungary
2 x 16-bit DAC -> 17-bit resolution
4 x 16-bit DAC -> 18-bit resolution
  Reply With Quote
Old 28th March 2012, 08:39 PM   #42
qusp is offline qusp  Australia
diyAudio Member
 
qusp's Avatar
 
Join Date: Oct 2009
Location: Brisbane, Australia
8 x 16bit dac ->stereo 18bit resolution, fancy that =)
sounds like it was more of an educated guess than i had assumed, but it sure fits the info rather well
  Reply With Quote
Old 28th March 2012, 10:24 PM   #43
diyAudio Member
 
Join Date: Aug 2008
nos topic,so perhaps it's rather like
8 x occasionally linear 16bit dac -> frequently nonlinear stereo 18bit resolution
  Reply With Quote
Old 28th March 2012, 11:56 PM   #44
diyAudio Member
 
Join Date: Jan 2008
Location: Virginia
Quote:
Originally Posted by oshifis View Post
2 x 16-bit DAC -> 17-bit resolution
4 x 16-bit DAC -> 18-bit resolution
False. 4x16bit=17 bit actual resolution.
Due to addition of noise+distortions, you get at the most 3dB THD+n gain at every doubling.
  Reply With Quote
Old 29th March 2012, 12:05 AM   #45
Account disabled at member's request
 
Join Date: Apr 2009
When you hear the dac in your system and music is what you care about, the bit resolution is not that interesting; at least I feel so.
Nice to know what's going on technically, but it's all based on speculation so I don't see any sense.
When this thread is about discovering which chips are used and maybe trying a DIY copy, IMO it is a dead end project.
  Reply With Quote
Old 29th March 2012, 12:54 AM   #46
diyAudio Member
 
abraxalito's Avatar
 
Join Date: Sep 2007
Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though...
Blog Entries: 109
Send a message via MSN to abraxalito Send a message via Yahoo to abraxalito Send a message via Skype™ to abraxalito
Quote:
Originally Posted by jitter View Post
There's also a review of the Octave by Hifi Critic, and they measured the actual resolution to be 18 bits.
I read that review and have plenty of doubts about it. The reviewer (Martin Colloms) states:

The actual resolution is about 18 bit...

but does not tell us how he ascertained this. There's ample evidence in this review that the work wasn't very thorough so in the absence of explanation for how he arrived at his figure, I'm not deterred. One could make an educated guess that Colloms is estimating the resolution from a linearity measurement with decreasing amplitude single tone stimulus. In which case he might just be saying that the step size of the DAC LSBs are within 0.25LSB. Hard to tell.
__________________
Seek not the favour of the multitude...rather the testimony of few. And number not voices, but weigh them. - Kant
The capacity for impartial observation is commonly called 'cynicism' by those who lack it.
  Reply With Quote
Old 29th March 2012, 02:59 AM   #47
qusp is offline qusp  Australia
diyAudio Member
 
qusp's Avatar
 
Join Date: Oct 2009
Location: Brisbane, Australia
Quote:
Originally Posted by tritosine View Post
nos topic,so perhaps it's rather like
8 x occasionally linear 16bit dac -> frequently nonlinear stereo 18bit resolution
hehehe

good chance he used that same simplistic/flawed math

where is this talk of a diy copy? its been mentioned twice now that this was a goal being discussed
(by the same person, but still mentioned twice) does discussing anything at all at diya mean talking about making a diy copy now?

Last edited by qusp; 29th March 2012 at 03:15 AM.
  Reply With Quote
Old 29th March 2012, 06:07 AM   #48
jitter is offline jitter  Netherlands
diyAudio Member
 
jitter's Avatar
 
Join Date: Aug 2004
Location: Eindhoven, The Netherlands
Quote:
Originally Posted by pieter t View Post
When you hear the dac in your system and music is what you care about, the bit resolution is not that interesting; at least I feel so.
Nice to know what's going on technically, but it's all based on speculation so I don't see any sense.
When this thread is about discovering which chips are used and maybe trying a DIY copy, IMO it is a dead end project.
I don't think the OP meant to copy this design by finding out what components were used. It's just the need to know that might have led him to ask this question.

Furthermore, in the reviews is written that the industrial DACs are in need of "glue logic" with proprietary software to make them work. Even if one did know all the hardware, not having the software would make it a lot harder to DIY a clone of some sort. IMO not impossible, though.

To me it seems likely that not knowing the type adds a bit to the mystery that is called High End. Perhaps the DAC-ICs are regarded in their field as mundane types (it's actually written in the 6 moons review that they're nothing special, an industry standard). Like we would regard e.g. an NE5532.
Imagine how knowing that would prejudice a lot of people into believing it can't be good...

The company I work for is an OEM of industrial electronics but we do make on item for the high end audio market (no, not Metrum's products). We know what it costs to make and we know what the customer sells it for (big markup!). We also know what's inside, and do you think I would buy it? Not in a million years, it's filled with NE5532s and IC amp modules, but I don't actually know what it sounds like.
Now, do you see what I mean?

Last edited by jitter; 29th March 2012 at 06:14 AM.
  Reply With Quote
Old 29th March 2012, 06:15 AM   #49
diyAudio Member
 
abraxalito's Avatar
 
Join Date: Sep 2007
Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though...
Blog Entries: 109
Send a message via MSN to abraxalito Send a message via Yahoo to abraxalito Send a message via Skype™ to abraxalito
Quote:
Originally Posted by qusp View Post
where is this talk of a diy copy? its been mentioned twice now that this was a goal being discussed
(by the same person, but still mentioned twice) does discussing anything at all at diya mean talking about making a diy copy now?
Yeah that's all beyond me - can't figure it out. The price of the original is very reasonable, and the measurements suck. Thinking in particular of the high order distortion products on Collom's FFT - yuck! Can't see any point in attempting a clone myself - I'd at very least wanna change the DAC which would make it not really a copy at all...
__________________
Seek not the favour of the multitude...rather the testimony of few. And number not voices, but weigh them. - Kant
The capacity for impartial observation is commonly called 'cynicism' by those who lack it.
  Reply With Quote
Old 29th March 2012, 07:13 AM   #50
qusp is offline qusp  Australia
diyAudio Member
 
qusp's Avatar
 
Join Date: Oct 2009
Location: Brisbane, Australia
Quote:
Originally Posted by abraxalito View Post
Yeah that's all beyond me - can't figure it out. The price of the original is very reasonable, and the measurements suck. Thinking in particular of the high order distortion products on Collom's FFT - yuck! Can't see any point in attempting a clone myself - I'd at very least wanna change the DAC which would make it not really a copy at all...
thats what you expect when there is not even any sort of buffer/filter to get rid of the junk from a dac not designed for audio (even an audio dac would be full of junk used like that). the designers clearly (like many nos dac designs) rely on ythe ear/brain doing this filtering.

indeed I wouldnt touch it, its a novel idea, pieter clearly enjoys his but you wouldnt catch me 1. buying a commercial dac at all until I retire from DIY perhaps or 2. going anywhere near this one.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
dac chips kiwi88 Digital Line Level 2 5th August 2009 03:25 PM
dac chips for trade tubedude63 Swap Meet 1 25th May 2007 11:04 PM
Looking for 6 x TDA1545A DAC chips WALTER BURKHARD Swap Meet 2 5th April 2007 11:24 PM
F.S.: various Dac-chips Cobra2 Swap Meet 4 23rd November 2004 11:00 PM
Best DAC chips 5th element Digital Source 7 7th June 2004 05:08 PM


New To Site? Need Help?

All times are GMT. The time now is 03:47 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2