Head-Fi.org › Forums › Equipment Forums › Portable Headphone Amps › ibasso D4 question on DAC chips
New Posts  All Forums:Forum Nav:

ibasso D4 question on DAC chips

post #1 of 9
11/17/09 at 7:13pm
Thread Starter 
I saw ibasso D4 using "Dual Wolfson WM8740 DAC Chip + TI PCM2706", but PCM2706 is a USB chip with DAC inside. I checked spec for PCM2706 and could find the digital pin on it. How these three chips configured?

BTW, is D4 has socket for OPA rolling?
Reply
post #2 of 9
11/17/09 at 10:13pm

yes

you can change the opamps in the D4...no idea how the chips are configured...what I do know is that it has Dual DACs, one DAC per channel and it sounds fantastic!
Reply
post #3 of 9
11/18/09 at 2:07pm
Thread Starter 

Thanks for help

It's good to know we can roll OPA in D4 ! Any suggestion on result of rolling OPAs in D4 yet?

Further reading on PCM2706 spec, I found following data from TI and I guess it used as I2S interface, am I right?

# On-Chip USB Interface:

* No Need of Dedicated Device Driver
* With Full-Speed Transceivers
* Fully Compliant With USB 1.1 Specification
* Certified by USB-IF
* Partially Programmable Descriptors
* Adaptive Isochronous Transfer for Playback
* Bus-Powered or Self-Powered Operation

# Sampling Rate: 32, 44.1, 48 kHz
# On-Chip Clock Generator With Single 12-MHz Clock Source
# Single Power Supply:

* Bus-Powered: 5 V, Typical (VBUS)
* Self-Powered: 3.3 V, Typical

# 16-Bit Delta-Sigma Stereo DAC

* Analog Performance at 5 V (Bus-Powered),
3.3 V (Self-Powered): THD+N: 0.006% RL > 10 kΩ, Self-Powered THD+N: 0.025% RL = 32 Ω SNR = 98 dB Dynamic Range: 98 dB PO = 12 mW, RL = 32 Ω
* Oversampling Digital Filter Pass-Band Ripple = ±0.04 dBStop-Band Attenuation = -50 dB
* Single-Ended Voltage Output
* Analog LPF Included

# Multiple Functions:

* Up to Eight Human Interface Device (HID) Interfaces (Depending on Model and Settings)
* Suspend Flag
* S/PDIF Out With SCMS
* External ROM Interface (PCM2704/6)
* Serial Programming Interface (PCM2705/7)
* I2S Interface (Selectable on PCM2706/7)
Reply
post #4 of 9
11/18/09 at 2:32pm
Thread Starter 

shipping time?

How long it will arrive after I placed order?

I have placed order yesterday, haven't get email confirmation yet. Did you all got email confirmation and tracking number?
Reply
post #5 of 9
12/18/09 at 4:59am
USB 1.1 is great for old eMacs
Reply
post #6 of 9
12/18/09 at 2:54pm
I ordered mine on Monday, got the shipping confirmation with tracking on Wednesday and received it today (Friday). I'm in the Atlanta, GA area. Pretty dam quick coming from China. Sounds very nice!
Reply
post #7 of 9
12/19/09 at 3:56am
Lucky you; I'm closer to China and on the same schedule but I am off the beaten path and still waiting...

Edit; not on the same schedule as it is still in China! Did you pre-order yours from the manufacturer with the upgraded tube?

Quote:
Originally Posted by Bowedtoothdoc View Post
I ordered mine on Monday, got the shipping confirmation with tracking on Wednesday and received it today (Friday). I'm in the Atlanta, GA area. Pretty dam quick coming from China. Sounds very nice!
Reply
post #8 of 9
12/19/09 at 8:25am
yes the Ti chip is configured as USB receiver. not i2s, but spdif AFAIK. shipping from ibasso is usualy very quick. USB 1.1 is about as good as you are going to get with just about all usb audio devices. special (and expensive) codecs must be licensed to allow usb 2
Reply
post #9 of 9
1/10/10 at 9:06pm
Quote:
Originally Posted by qusp View Post
yes the Ti chip is configured as USB receiver. not i2s, but spdif AFAIK. shipping from ibasso is usualy very quick. USB 1.1 is about as good as you are going to get with just about all usb audio devices. special (and expensive) codecs must be licensed to allow usb 2
this is good to know, considering im thinking that the usb dacs on all these portables might sound too similar,,

considering replacing my predator with a d4 or i qube as a portable dac,, but only if the usb dac's on said portables will sound better than the predator dac?
Reply
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Portable Headphone Amps
Head-Fi.org › Forums › Equipment Forums › Portable Headphone Amps › ibasso D4 question on DAC chips