To get more information contact me at: firstname.lastname@example.org
May 7 st , 2010
To play the 96/192KHz 24bit audio files it is necessary a PC and a
software like the freeware Foobar 2000
Windows Media Player is not able to play files over 96KHz .
In these my first tests has been used an EMU 0404 USB, the my last amplifier 813 SE and the loudspeakers The Monitor 2.
I consider good and very near to an analog source only the 192KHz 24bit stored in any lossless audio format like the Flac.
If you have a good sound card you can make some simple test with the free tracks available on 2L website.
The second type of high resolution audio tracks are the DSD present in SACD.
Using a sampling frequency 64 times higher than that of a standard Compact Disc, Super Audio CD offers a frequency response of up to 100 kHz and a dynamic range of up to 120 dB across the entire audible range.
The DSD tracks on paper should be better than 192KHz 24bit so I have decided to test both the technologies.
I have found a good explanation of the DSD on Korg web site, see here.
Follows a table to see the check the amount of information present on each format.
A 40Gb hard disk can contain:
16hours@96kHz/24bit/2trk High resolution
8hours@192kHz/24bit/2trk Top high resolution
email@example.comMHz/1bit/2trk SACD DSD normal
firstname.lastname@example.orgHz/1bit/2trk Hi-end DSD
For the DSD section click here
Hi-Resolution Systems 192KHz 24bit
The main choices are:
USB to I2S module
If we want use the PC to store audio files and ear these with a hi-end DAC
like my DAC End
or DACEnd 2
is possible use an USB to SPDIF created with a single chip
This type of converter could be created using the Kit/2 by HagTech at only 49$ and no driver will be necessary.
This solution is valid only for low resolution files at 16bit 44KHz (CD quality) but to play high resolution files at 192Hz 24bit it is necessary a custom driver and a dedicated USB interface.
On the market I
have found these 2 products for this use:
The M2Tech hiFace interface has been conceived to obtain the highest quality digital audio signal using a PC or MAC.
hiFace input format is a data stream signal with sampling frequency/resolution up to 192kHz/24bits, available from a PC or MAC USB port.
Internal very low jitter oscillators and proprietary drivers allow for playing 192kHz/24bits audio files that feature the best signal quality.
cost about 150$
| Musiland Monitor 01
Musiland Monitor 01 is available in two versions: with spdif and
toslink outputs or with an internal DAC so analog outputs.
cost about 70$
- USB Audio 2.0 Reference Design
cost about 150$
- XS1-L1 chip for USB Audio 2.0
cost about 7-9$
only for OEM
XD1014 - LQFP64
XtremeUSB XD1014 EVB
Chess Lim of the XtremeUSB are developping an USB interface called XD1014 EVB. It will be available for the shipment in two weeks and It will work at 192kHz 24bit. It has Optical in out for SPDIF up to 96kHz but and it have 192kHz if we wire for coaxial. It support driver for Windows XP, Vista and 7 for both 32bit 64bit and Mac is for Snow Leopard only. XD1014 EVB has oscillator to generate the Master Clock I have asked to have a dip connector to get the I2S signals. The price is still to define by XtremeUSB .
Vinyl EnvyUSB 2.0 Audio Controller
Following the I2S specifications the transmission of the two channels
(left and right) are sequential on a unique wire.
This mean that if we connect a DAC directly to the I2S bus one channel will play first of the other.
In the most of DAC, including the AudioNote with AD1865, this problem is not considered.
This delay is about 11.34Ás @ 44.1kHz, less at 192kHz, and it must be considered in high end realization also if the negative effect could be ear only on headphone (reference Eric Juaneda, regal and vzs on DiyAudio).
To remove this delay it is necessary use a shift register like the one used by:
none, like previuos
To get the best performances the choice is the PCM1704 considered by many
DIY like the best.
Others DAC like the Crystal CS4397, the Wolson WM8740, Analog Device AD1955, Burr Brown PCM1798 cannot be considered because have an internal digital filter and an active I/V converter.
VACUUM TUBE OUTPUT STAGE