[aqtaket]

Another quick question to the happy owners of this wonderful Fostex unit:
If I hook up a DAP vis USB OTG cable+ the Fostex USB cable supplied, will it supply power to the DAP (and charge it) from its USB 2.0 port, or this port is only meant for data transfer?

 

[HungryPanda]

As far as I know the USB is only for connection to computer

 

[aqtaket]

As far as I know the USB is only for connection to computer

So it wouldn't work with a DAP via OTG? Even if a DAP supports transferring data via USB OTG?

 

[HungryPanda]

I have never tried so cannot advise

 

[davehutch]

Having an issue...
I bought an adaptor from Drop.com, the balanced XLR to 2.5mm, so that I could use my IEMS. However I get small electric shocks (tingles) from the metal shells of my IEMs.
Any idea what's going on? I have a multimeter and if I measure between the left and right shells, there's about 19V.
I should also add that I'm using optical in to the amp
Can anyone help please?

 

[aqtaket]

Having an issue...
I bought an adaptor from Drop.com, the balanced XLR to 2.5mm, so that I could use my IEMS. However I get small electric shocks (tingles) from the metal shells of my IEMs.
Any idea what's going on? I have a multimeter and if I measure between the left and right shells, there's about 19V.
I should also add that I'm using optical in to the amp
Can anyone help please?

There are differenr pinouts for 2.5mm balanced. The so-called "European", "Asian", "Fiio", "AK"....
Looks like the pin-out of your adapter does not match the one of you male-jack in the phones..

 

[davehutch]

There are differenr pinouts for 2.5mm balanced. The so-called "European", "Asian", "Fiio", "AK"....
Looks like the pin-out of your adapter does not match the one of you male-jack in the phones..

I also made my own adaptor cable and I get the same issue. Fostex distributor, SVC are assisting but there doesn't seem to be a pattern to it. If I measure between pins 1 and 3 I get 1 or 2 millivolts, which is fine.
Same between pins 2 and 4
Yesterday I plugged in and for a while it was all fine, but then I started getting shocks again.

Can anyone else with metal bodies IEMs let me know if they experience the same issue?

 

[aqtaket]

This Fostex has only one DAC chip, but a balanced amplification part, is that correct?
If so, that seems a bit strange to me, a balanced DAC/amp should have two DACs and two amps for true balance. What Gives balanced output in this case? Only higher power?

 

[selvakumar]

hi i tried all burson opamps v5i,v6c,v6v

 

[dsnedeco]

Can someone explain to me exactly how to uninstall the HP-A4 usb driver and install the HP-A4BL usb driver on Windos 10. I have been unable to do that. I have downloaded "FOSTEX_USB_Audio_Driver_V221.zip" It seems like no matter what I do I end up with the HP-A4. It works OK but it is not the HP-A4BL. Some where along the line months ago I had it installed. But then my computer crashed and I can't seem to get it back.

 

[davehutch]

I also made my own adaptor cable and I get the same issue. Fostex distributor, SVC are assisting but there doesn't seem to be a pattern to it. If I measure between pins 1 and 3 I get 1 or 2 millivolts, which is fine.
Same between pins 2 and 4
Yesterday I plugged in and for a while it was all fine, but then I started getting shocks again.

Can anyone else with metal bodies IEMs let me know if they experience the same issue?

*Update*
Fostex sent me an earthed power supply. All is now fine

 

[HungryPanda]

Glad to know all is fine

 

[gimmeheadroom]

Especially when you look at the original images of the Klipsch when it was first shown:
http://www.avsforum.com/klipsch-tea...er-ear-headphones-and-usb-dacamp-at-ces-2017/
and
https://smart-sound.jp/stuffblog/blog/klipsch-heritage

But the Klipsch material says it uses an ESS DAC and this thread seems to say Burr Brown...did anybody track this down?

 

[RSC08]

Anyone tried this amp with the Hifiman Sundara? I'm looking to upgrade my home setup and currently deciding if I should go HP-A4 + Sennheiser HD650 or Hifiman Sundara.

 

[gimmeheadroom]

Sennheiser 600 series are at their best with a tube amp. The Fostex would not be my choice for Sennheisers. I have no idea about the Sundara.