Home of the Squeezebox™ & Transporter® network music players.
Page 1 of 2 12 LastLast
Results 1 to 10 of 12
  1. #1
    Senior Member
    Join Date
    Feb 2011
    Location
    Cheshire, UK
    Posts
    3,693

    iPhone/iPad Lightning Adapter SQ

    Does anyone know for certain what the DAC in the official Apple Lightning Headphone adapter is capable of?
    Iíve read 24/96 somewhere but cannot find a definitive answer.
    Reason for asking is that I have just upgraded to an iPhone 8 so have lost the 3.5 jack socket.
    Iíve used a HiFiMeDIY USB DAC with the camera kit converter on occasions but it is a little on the quiet side (I do have a mini headphone amp as well but carrying all this is a bit cumbersome)
    Main use is iPeng in playback mode with 16/44.1 Flacs but some 24/96 stuff as well.
    Edit. Headphones are B&W P7s which do take a bit of driving.

  2. #2
    Senior Member pippin's Avatar
    Join Date
    Oct 2007
    Location
    Berlin
    Posts
    14,619
    Hard to know for certain since it's hard to debug, but I'd be extremely surprised if it's more than 48/16.
    That's what AirPlay uses (44.1/16 and 48/16 as ALAC) and my guess is iOS transcodes to that before the DAC.

    That's usually how these things work under iOS, iOS transcodes to whatever capability the chosen audio route supports.

    iPeng currently supports up to 96/24 natively but that's going to change in the future, at least optionally.

    There have been comparison tests with older iPhone DACs and the DAC in the adapter seem to be inferior. Which isn't really surprising given the ultra-small package size and power availability. So if you really care about SQ you should use a different adapter or lightning capable headphones.
    It's probably still better than Bluetooth, though...
    Last edited by pippin; 2019-04-28 at 14:19.
    ---
    learn more about iPeng, the iPhone and iPad remote for the Squeezebox and
    Logitech UE Smart Radio as well as iPeng Party, the free Party-App,
    at penguinlovesmusic.com
    New: iPeng 9, the Universal App for iPhone, iPad and Apple Watch

  3. #3
    Senior Member
    Join Date
    Apr 2005
    Location
    UK/London
    Posts
    1,492
    Paul Webster
    http://dabdig.blogspot.com
    Author Radio France (FIP etc) plugin

  4. #4
    Senior Member
    Join Date
    Feb 2011
    Location
    Cheshire, UK
    Posts
    3,693
    Quote Originally Posted by pippin View Post
    Hard to know for certain since it's hard to debug, but I'd be extremely surprised if it's more than 48/16.
    That's what AirPlay uses (44.1/16 and 48/16 as ALAC) and my guess is iOS transcodes to that before the DAC.

    That's usually how these things work under iOS, iOS transcodes to whatever capability the chosen audio route supports.

    iPeng currently supports up to 96/24 natively but that's going to change in the future, at least optionally.

    There have been comparison tests with older iPhone DACs and the DAC in the adapter seem to be inferior. Which isn't really surprising given the ultra-small package size and power availability. So if you really care about SQ you should use a different adapter or lightning capable headphones.
    It's probably still better than Bluetooth, though...
    Thanks. Iíve got a camera converter so Iíll try a Dragonfly with it.
    VB2.4 storage QNAP TS419p (NFS)
    Living Room - Joggler & SB3 -> Onkyo TS606 -> Celestion F20s
    Office - Pi3+Sreen -> Sony TAFE320 -> Celestion F10s / Pi2+DAC & SB3 -> Onkyo CRN755 -> Wharfedale Modus Cubes
    Dining Room -> SB Boom
    Kitchen -> UE Radio (upgraded to SB Radio)
    Bedroom (Bedside) - Pi2+DAC ->ToppingTP21 ->AKG Headphones
    Bedroom (TV) - SB Touch ->Sherwood AVR ->Mordaunt Short M10s
    Everything controlled by iPeng

  5. #5
    Senior Member
    Join Date
    Feb 2011
    Location
    Cheshire, UK
    Posts
    3,693
    Quote Originally Posted by Paul Webster View Post
    Interesting but still inconclusive.
    VB2.4 storage QNAP TS419p (NFS)
    Living Room - Joggler & SB3 -> Onkyo TS606 -> Celestion F20s
    Office - Pi3+Sreen -> Sony TAFE320 -> Celestion F10s / Pi2+DAC & SB3 -> Onkyo CRN755 -> Wharfedale Modus Cubes
    Dining Room -> SB Boom
    Kitchen -> UE Radio (upgraded to SB Radio)
    Bedroom (Bedside) - Pi2+DAC ->ToppingTP21 ->AKG Headphones
    Bedroom (TV) - SB Touch ->Sherwood AVR ->Mordaunt Short M10s
    Everything controlled by iPeng

  6. #6
    Senior Member
    Join Date
    Feb 2011
    Location
    Cheshire, UK
    Posts
    3,693
    @pippin
    Leaving aside lightning headphones do you use a usb DAC with an ithingy? If so which?
    VB2.4 storage QNAP TS419p (NFS)
    Living Room - Joggler & SB3 -> Onkyo TS606 -> Celestion F20s
    Office - Pi3+Sreen -> Sony TAFE320 -> Celestion F10s / Pi2+DAC & SB3 -> Onkyo CRN755 -> Wharfedale Modus Cubes
    Dining Room -> SB Boom
    Kitchen -> UE Radio (upgraded to SB Radio)
    Bedroom (Bedside) - Pi2+DAC ->ToppingTP21 ->AKG Headphones
    Bedroom (TV) - SB Touch ->Sherwood AVR ->Mordaunt Short M10s
    Everything controlled by iPeng

  7. #7
    Senior Member pippin's Avatar
    Join Date
    Oct 2007
    Location
    Berlin
    Posts
    14,619
    No, I usually donít. I do have an old Pure digital docking adaptor (with DAC) I used for a while and which I still use for testing and I do have an external DSD DAC I use for testing but Iíve got so many good, dedicated players around here that I canít even use all of those so beyond testing things I donít actually use iPhone accessory DACs.

    What do use a lot with iPhone, iPad and iPod is headphones but the are either AppleĎs or indeed analog headphones I use with this Apple adapter.
    ---
    learn more about iPeng, the iPhone and iPad remote for the Squeezebox and
    Logitech UE Smart Radio as well as iPeng Party, the free Party-App,
    at penguinlovesmusic.com
    New: iPeng 9, the Universal App for iPhone, iPad and Apple Watch

  8. #8
    Senior Member pippin's Avatar
    Join Date
    Oct 2007
    Location
    Berlin
    Posts
    14,619
    That said... I might be tempted to compare the two different Apple adapters I have because it might become more relevant this fall (hopefully so...): the lightning-to-analog adapter and the USB-C-to-analog one. Itís a bit bigger, maybe it also has different tech?
    ---
    learn more about iPeng, the iPhone and iPad remote for the Squeezebox and
    Logitech UE Smart Radio as well as iPeng Party, the free Party-App,
    at penguinlovesmusic.com
    New: iPeng 9, the Universal App for iPhone, iPad and Apple Watch

  9. #9
    Senior Member
    Join Date
    Feb 2011
    Location
    Cheshire, UK
    Posts
    3,693
    Quote Originally Posted by pippin View Post
    No, I usually donít. I do have an old Pure digital docking adaptor (with DAC) I used for a while and which I still use for testing and I do have an external DSD DAC I use for testing but Iíve got so many good, dedicated players around here that I canít even use all of those so beyond testing things I donít actually use iPhone accessory DACs.

    What do use a lot with iPhone, iPad and iPod is headphones but the are either AppleĎs or indeed analog headphones I use with this Apple adapter.
    Thanks
    Generally I use other players - sb3, Pi etc - with iPeng as the controller but I do use iPeng in playback mode and headphones when my wife is watching TV in the same room.
    Iíve got the camera kit and use a hifime usb DAC with my b&w p7s but this isnt ideal as the volume is a little limited. The apple lightning adapter seems to allow a little more volume presumably because it doesnít use much current but like you suggested I think the SQ is reduced.
    What Iím looking for is something like the hifime - does 96/24 - but allows more volume.
    I have Bose QCs which are Bluetooth for travelling purposes.
    VB2.4 storage QNAP TS419p (NFS)
    Living Room - Joggler & SB3 -> Onkyo TS606 -> Celestion F20s
    Office - Pi3+Sreen -> Sony TAFE320 -> Celestion F10s / Pi2+DAC & SB3 -> Onkyo CRN755 -> Wharfedale Modus Cubes
    Dining Room -> SB Boom
    Kitchen -> UE Radio (upgraded to SB Radio)
    Bedroom (Bedside) - Pi2+DAC ->ToppingTP21 ->AKG Headphones
    Bedroom (TV) - SB Touch ->Sherwood AVR ->Mordaunt Short M10s
    Everything controlled by iPeng

  10. #10
    Senior Member
    Join Date
    Feb 2011
    Location
    Cheshire, UK
    Posts
    3,693
    Perhaps looking at it another way - does iPeng ďlimitĒ volume in any way? Foobar2000 on the iPhone playing the same flacs seems louder.
    VB2.4 storage QNAP TS419p (NFS)
    Living Room - Joggler & SB3 -> Onkyo TS606 -> Celestion F20s
    Office - Pi3+Sreen -> Sony TAFE320 -> Celestion F10s / Pi2+DAC & SB3 -> Onkyo CRN755 -> Wharfedale Modus Cubes
    Dining Room -> SB Boom
    Kitchen -> UE Radio (upgraded to SB Radio)
    Bedroom (Bedside) - Pi2+DAC ->ToppingTP21 ->AKG Headphones
    Bedroom (TV) - SB Touch ->Sherwood AVR ->Mordaunt Short M10s
    Everything controlled by iPeng

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •