5.1 usb decoder - 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 27th September 2011, 11:33 PM   #1
Account disabled at member's request
 
Join Date: Jul 2009
Default 5.1 usb decoder

Hi all, I am looking for a good 5.1 USB to analog decoder. I am building a 5.1 amplifier system and would like to be able to use HDMI, optical, coaxial and usb inputs to drive the 6 amplifier modules.

On the net I have found few affordable options:

HDMI LPCM 7.1 5.1 Multi-Channel Audio Decoder With Amplifier

AC3 DTS 5.1 Audio Decoder USB Sound Card DAC XBOX PS3 | eBay

NEW MOCHA X-3B AC3 DTS 5.1 DIGIT AUDIO DECODER &USB DTS | eBay

Thanks!
  Reply With Quote
Old 25th March 2012, 09:42 AM   #2
diyAudio Member
 
Join Date: Apr 2011
Default 5.1 USB Dac

Hi Alex,

What did you end up buying?

I buy most of my equipment from China. I currently have a Yaqin MC-10l tube amp and a DAC-01A (Xiang Pheng)

The 2 last of the products you listed are chinese. One of the sellers in China advised me against your second link. If you look at the RCA plug they used, it is obviously cheap stuff. However, I still somehow expect it to be better than a 3.5mm plug of something like Creative 5.1 X-fi USB.

The Mocha seems better. The explanation is pretty explicit that it can be used with computer configure to output 6 channels (not AC3, which is actually 6 channels encoded on 2) i.e. AAC 6 channels. I asked whether your second link can do it, and they were unable to answer.

For me, the USB input is the key requirement. I heard of lot of bad things about using HDMI for audio.

Serge
  Reply With Quote
Old 25th March 2012, 12:45 PM   #3
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
I have the decoder on the second link the OP posted. Sound quality pretty much sucks in stock form - mainly due (I think) to the volume control chip on the lower board. But worse than that, when I tried the USB input it has clicks, so given your requirement is USB, give it a wide berth. On SPDIF its ok. Price in China of this model is around the $100 mark.

I think the decoder board, based on the Crystal CS49324 has potential - I'm going to do a bit of reverse engineering on it It definitely needs decent dacs - i.e. not S-D type as fitted.
__________________
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 25th March 2012, 02:57 PM   #4
diyAudio Member
 
Join Date: Jan 2008
Location: Virginia
I had the CS49326 in a Harman Kardon receiver and it was definitelly a capable cip. CS49324 is from the same family with less decoding functions programmed in the ROM.

Implementation of USB probably sucks because USB 1.1 is limited to 16/48 and higher USB2.0 requires dedicated drivers.

Last edited by SoNic_real_one; 25th March 2012 at 03:08 PM.
  Reply With Quote
Old 25th March 2012, 04:17 PM   #5
diyAudio Member
 
Join Date: Apr 2011
Implementation of USB probably sucks because USB 1.1 is limited to 16/48 and higher USB2.0 requires dedicated drivers.

>> We are talking about 5.1, so movies. What is wrong with 16/48? Is there any movie where the sound in 24/96? What is wrong with using drivers for USB 2.0?
  Reply With Quote
Old 26th March 2012, 11:02 PM   #6
diyAudio Member
 
Join Date: Jan 2008
Location: Virginia
Usually you don't have those USB2 drivers, they are not native in Windows.
DolbyDigital has 448kbps while DTS has 754.5 kbit/s (sometimes the full rate 1509.75 kbit/s).
USB 1.1 audio hosts are limited by OS to 16/48kHz - that is 816kbit/sec per USB specs at 16 bit payload (deducting the overhead). If the controller uses 8 bit payload, the real datarate becomes 568kbit/s.
  Reply With Quote
Old 1st June 2012, 04:10 PM   #7
diyAudio Member
 
Join Date: Apr 2011
Hi,

I did get the Hifi360.com device (2nd link) as well.
To be honest, for movie whatching, it is ok. Same quality as if I connect directly to the optical input of my 5.1 amp.
I have no problem with the USB input, both using it as 5.1 sound card or sending AC3/DTS. AC3/DTS is much louder, but I think that the 5.1 mode is better tough.
In term of drivers, it uses a CM108 chips. CM provides the drivers and once installed, it works great.

When using it for music, you quickly realise it sucks. I have a Dac-01A, and you just cannot compare.

The 5.1 device are rare, so upgrade is not easy. The only option is to tweak the hifi360.com.
Abraxalito, did you do any tweak? Could you advise? Can the volume control switch be changed?

Best,
Serge
  Reply With Quote
Old 1st June 2012, 04:41 PM   #8
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
I haven't played with this board any more since my last post. I have to figure out the easiest way to interface it to 6 channels of multibit DAC (probably TDA1387 since those are very cheap and great sounding). Yes the volume control board could be changed, but then we'd need new firmware - either to implement volume for ourselves or perhaps to snoop the volume control bus (I2C I think) and redirect commands to the improved volume control chips.

On Taobao I've seen just the CS-based decoder board used here being sold separately - about 100rmb ($16 at current rate of exchange). Having just bought a Philips Blu-ray player which only has HDMI out though I'm more inclined to play around with an HDMI-based board now.
__________________
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 1st June 2012, 05:13 PM   #9
diyAudio Member
 
Join Date: Apr 2011
Can you post the taobao link of the item you are looking at? (taobao is also where I got my hifi360).

What they have not invented yet is a device with USB input (5.1 channels) and 3 optical stereo output. (No need DTS / AC3 since I only use computer.). So that I can connect each output to a separate dac. If you see such devise (or a program allowing to root the different channels to different dacs), let me know.

Serge
  Reply With Quote
Old 1st June 2012, 05:29 PM   #10
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
I bought a perspex baseboard with a display, an 8 channel volume control board (not really worth getting for the audio bits, but it also has a CPU which drives the display) and this iHDMI interface/decoder board :

˫HDMIӿ8ƵDI35H-Ա which is the valuable part. I've yet to power it up, so many projects on the go...
__________________
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

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
How to isolate USB instrument from interference conducted by the USB cable sunkai Parts 3 25th April 2014 03:19 PM
Will wireless USB hub lower the quality of my USB sound card output? rg12 Digital Source 6 6th January 2011 09:47 PM
Maybe have a CD transport source USB to drive a USB DAC? wa2ise Digital Source 0 6th February 2007 01:22 AM
USB powered NOS USB DAC with built-in headphone amp dsavitsk Digital Source 15 10th August 2006 07:11 AM
Favorite USB to audio decoder? speaker Digital Source 27 4th February 2006 02:47 AM


New To Site? Need Help?

All times are GMT. The time now is 10:41 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