Has anyone tried or heard of Audio Technica AT-PHA55BT (ldac reciever) , or ampio m1 vx-1880, Bluetooth 5.0, aptx HD and ldac, any good?

  1. imparanoic
    Has anyone tried or heard of Audio Technica AT-PHA55BT (ldac reciever) , or ampio m1 vx-1880, Bluetooth 5.0, aptx HD and ldac receiver with 3.5mm jack, any good?

     
  2. myusernameislove
    I have ordered something similar - Audio Technica AT-PHA55BT. Specs. Review.
    It is BT4.2 ldac/AAC/Aptx receiver based on ES9118 SABRE HiFi SoC with an impedance switch. I plan to use it with iFi iEMatch and xPeria XZ1 smartphone to listen to music through Echobox Finder X1 earphones and maybe later through something more green and andromedish.

    [​IMG]
     
    Last edited: Jan 11, 2018
    imparanoic likes this.
  3. myusernameislove
    I have found an article about ES9118 chip - according to it it sounds better then both LG G5 Hi-Fi module (ES9028 SABRE DAC and SABRE 9602 AMP) and LG V10 phone (ES9018 + SABRE9602), which is specs wise quite similar.

    In one review, the sound of LG V10 was compared with number of DAPs and high end earphones and it was described as very clean, very detailed, but dry and with poor sense of space. It remained near dead silent even with very sensitive earphones. Mids were described as a bit aggresive and bass as a bit rough, a little poorly controlled and not hitting hard enough. Overall sound was described as lacking life and dynamics, and therefore it was adviced to pair V10 with more colour sounding earphones such as IE80 is. The verdict said, that the phone is perfectly suitable for use with mid tier (~300USD) earphones.

    I would expect the same performance level (at best) with ldac units like these. Until an audiophile grade ldac portable receiver is released, it may function sufficiently.
     
    Last edited: Jan 9, 2018
  4. imparanoic
    this is perfect for me

    i will order one
     
  5. imparanoic
    i want one with ldac ( which i have on my walkman nw-zx100 and sony xperia XZs phone) or should i wait for future models with aptx hd and bluetooth 5.0
     
  6. myusernameislove
    If you have 2 Ldac players, then there is no need for AptxHD in my opinion. Ldac connected in Quality priority mode (990kbps) is somehow superior to AptxHD (576kbps) in transfer rate. For a while I wondered under what conditions is 990kbps throughput available on BT4.2 devices. They say the limit of BT4.2 is 650kbps, which is even less then Ldac Normal priority transfer rate of 660kbps. I think the explanation is hidden in this article, and I will quote it:

    "There are two major parts to Sony’s LDAC. First is achieving a high enough Bluetooth transfer speed to reach 990 kbps, and the second is squeezing high resolution audio data into this bandwidth with a minimal loss in quality.

    The first stage is accomplished by using Bluetooth’s in-house Enhanced Data Rate (EDR) option, which was introduced all the way back with Bluetooth 2.0 to increase maximum speeds. EDR speeds are not usually used by A2DP audio profiles, but the spec is rated up to 3 Mbps. Although in reality, 1.4 Mbps is mostly achievable, with 1 Mbps being considered the minimum stable connection. Hence why Sony’s LDAC sits just under this threshold at 990 kbps.

    I should point out that EDR is an optional part of even newer Bluetooth 4.x devices, as the focus has been on decreasing power consumption for the most part. So not every chip, and therefore not every phone, will necessarily support Sony’s LDAC at the highest quality setting. Bluetooth 5 supports 2 Mbps low energy speeds out of the box, and is also backward compatible with EDR versions of Bluetooth, but again this higher speed is optional."​

    As you see, all BT5 devices are backwards compatible with all BT4.2 devices, but you would need receiver that supports BT4.2 BR/EDR for smooth 990kbps operation, because BT4.2 LE (BLE) is capable only of max. theoretical 650kbps transfer rate, practically even less. Does AT-PHA55BT support BR/EDR? I do not know, maybe.

    Ldac, which is lossy, should be able to transfer CD audio (16bit 44.kHz flac) without information loss because such flacs usualy fit in its 990kbps range. AptxHD will probably sound a hair more compressed with its 576kbps transfer rate. Ldac is also Sony made: there may be some benefits - maybe DSEE HX applied on receiving end? BT5 will provide you with even higher maximal throughput and distance and probably with less power consumption. See these 2 articles for detailed information: 1, 2. BT5 may, if I understand it correctly, lessen the amount of disruptions, that you would hear in areas highly polluted with WiFi network signals during use of Ldac in (highly demanding) Quality priority mode.

    This is the hardware inside of Ampio products:
    G1: Qualcomm CSR BT chip + dedicated TI PCM5102A DAC + TI TPA6133A2 amp . No mic.
    P1+M1: Qualcomm CSR8675 BT chip (with Dac on chip) + TI TPA6133 amp.

    Ampio G1 has no clip and it is bulky, which you may find impractical. The other two units do not have dedicated dac chip, but on the other hand, neither has AT-PHA55BT. Sound characteristics of DAC and AMP will be very important, so will be output impedance (AT has impedance switch - 16ohms/32ohm), amount if hiss, and quality of craftmanship. You can lower Output impedance and remove hiss with two iFi products: iEMatch and EarBuddy.

    //
    review of M1 and G1
    review of P1
     
    Last edited: Jan 11, 2018
  7. imparanoic
    Great info“thx
     
  8. myusernameislove
    Similar products
    Ldac earphones
    • i.Tech ProStereo H2 (BT4.2, Ldac, AptxHD, AKM+ DAC/Amplifier, see 1, 2 )
    • Sony WI-1000X (BT4.1, Ldac, AptxHD), Sony WI-H700 (BT4.1, Ldac, AptxHD, inferior to WI-1000X), Sony MDR-XB80BS (BT?.?, Ldac, Aptx)

    Sony list.
    Interview.
     
    Last edited: Jan 17, 2018
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  9. myusernameislove

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