Hi everybody,
So now I have 2 conflicting opposite statement !
Any other additional votes/experiences to chime in ?
I will email ibasso as well, they might respond.
thank you !
Lionel
If your D4 is connected to USB, you cannot use the amplifier section as a stand-alone amp. If you plug any source into the Aux In/Out while connected to USB, you will hear nothing, regardless of the position of the power switch!
The D4 will only output the audio from the USB when using the USB input. The AUX IN/OUT will only output the decoded DAC when plugged to USB cable. This allows the D4 to be used as a standalone DAC and will draw no power from the battery if the USB position is selected on the battery switch.
Hi there,
Sorry, I am not sure to understand.
Does that mean that if USB isconnected (for power) then the amp will amplify the USB audio and not the line in ?
I am interested in having the possibility of using the amp alone (in usb powered mode).
Thank you
Lionel
You can use it as a standalone amp for your portable DAP/PMP without using the batteries. There's a switch on the back of it that says USB and Battery. When you plug it into your computer to use as an amp, NOT as a DAC, you can plug your DAP into AUX IN/OUT.
I was listening to a very long song the other day with my Ipod + D4 and the battery just died. So I just plugged the D4 to my USB and continued listening!
If your D4 is connected to USB, you cannot use the amplifier section as a stand-alone amp. If you plug any source into the Aux In/Out while connected to USB, you will hear nothing, regardless of the position of the power switch!
Mine is like HiFlight's experience. If I provide USB power I can only use USB DAC as the input, but not the DAP or iPod. I must use a 9v battery for power if I want to listen to an iPod. Applying USB power always changes my D4 analog input jack into the DAC line out.
I think the first batch of D4 (like mine) could not use USB power for listening to an iPod.
"When there is a USB signal inputting, the D4 will provide Line Out on the AUX IN/OUT port, at the same time, provide amplified signal on the Headphone jack. If there is an analog signal inputting from the AUX IN/OUT jack, the D4 will work as a standalone headphone amplifier and provide amplified signal on the Headphone jack."
I'm not sure about on the computer, haven't tried it like that.
I do on the other hand know that you can power it from the USB and listen to my J3 when I connect it to my PS3.
What you would probably have to do is set your computer to another sound card and the D4 will most likely not be transmitting any data and just be powered
by the USB.
Maybe there was a bug in the earlier D4's and later ones accept the input from AUX and then use the amp section only, even when using the USB for power, which would make since.
Alright, I just checked my earlier theory, when you change the playback device on your computer (from USB DAC to normal computer speakers or whatever you use) the D4 does
indeed play from the Aux In.
If this does not work for anyone else then I guess jamato is right and it does have something to do with the later models. (Got mines recently by the way.)
This must be the behavior (no active usb audio on the USB cable would allow to power by usb and amp the aux in).
And maybe the earlier model behaved differently.
As a note, ibasso has confirmed that the amp can be used alone, on USB power and amplify the signal from the line in.
Thank you for the input in put and experience !
Lionel
If you are planning to use the OPA1611 in the D10, you will need to solder 2 of them onto a 2 to1 SOIC to DIP adapter, as they are single-channel only. If you want a dual channel plug and play, order the OPA1612 in DIP configuration.
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