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Sé el primero en enterarte de las novedades, rebajas, reviews y todo lo que pasa en el mundo de los auriculares y el sonido portátil.

iBasso DX80.Análisis técnico y review (II)

iBasso DX80.Análisis técnico y review (II)

En esta segunda parte de la review del iBasso DX80 nos centraremos en las salidas adicionales del reproductor, además de un análisis detallados de la placa base y la selección de componentes.

 

INTERNAL DESIGN & ARCHITECTURE

[separator type=”thin”]

As briefly introduced in 1st part of the review, the Ibasso DX80 entails a new platform design. It moves to a newer lower power quad-core chipset based on the Cortex A7 with a frequency of up to 1.3GHz that includes, among others, integrated S/PDIF output used in the coaxial/optical jack at the top of the DX80 (see below).

Ibasso-DX80-reproductor-DAC-auriculares-fig25

Fig.1: Top view of the Ibasso DX80 mainboard.

 

  1. Each side of the Mainboard has one microSD connector for a total of two.
  2. New Cortex A7 based processor helps improving the playback battery life with a minimum of 12/13hrs depending on the load and volume.
  3. It keeps using 512MB Ram which should be plenty for a dedicated music player that doesn’t need multitasking or gaming.
  4. At the bottom of the player, we can see the 6 Nichichon Golden series “reservoir” capacitors that make sure the output audio stage never runs “dry” of current.
  5. On the top view, we have the DUAL DAC CS4398 that is shielded separately from the digital section (other players with this configuration such as the A&K 120 II, cost as much as 3 times the DX80).
  6. One of the big novelties on the Ibasso DX80 is the addition of the USB XMOS receiver that supports up to 32bits/384KHz in PCM mode and native DSD( DSD64 (2.8MHz), DSD128 (5.6MHz), DSD256 (11.3MHz), DSD512 (22.6MHz)). In order to find a portable music player with such capability you need to jump up to an Astell&Kern AK240 (at 2500 USD, you can buy 6 or more DX80…).
  7. Output stage is designed around dual supply IC that generates around +/-5.1V (with the help of an extra pair of Nichichon GOLD SERIES capacitors) for the dual OPA1602 as voltage gain and dual LMH/BUF current buffer output.
  8. It keeps the output relay from the DX50/90 family to block any “pops” at start or shutdown of the player.

 

Ibasso-DX80-reproductor-DAC-auriculares-fig26

Fig.2: Bottom view of the Ibasso DX80 mainboard

COMPARISON OF THE IBASSO DX80, DX50 AND DX90

[separator type=”thin”]
DX80 DX50 DX90
SoC CPU Quad-Core ARM      Cortex-A7

Rockchip RK3128

Single-Core ARM Cortex-A9

Rockchip RK2926

Dual-Core ARM    Cortex-A9

Rockchip RK3026

RAM memory 4 Gb 16 bits DDR3 SDRAM 4 Gb 8 bits DDR3 SDRAM 4 Gb 16 bits DDR3 SDRAM
FLASH memory Samsung 8GB (fully enabled for the OS) SK Hynix 8GB MLC NAND

 

Micron 8 GB MLC NAND

 

Battery and SoC Power Management IC Richtek RT5037 X-Power APX202 X-Power APX202
USB controller XMOS XS1-L6A supports PCM up to 32/384KHz and DSD64/128/512 Integrated inside Rockchip RK2926 limited to PCM 24/192KHz and no DSD Integrated inside Rockchip RK2926 limited to PCM 24/192KHz and no DSD
S/PDIF output Integrated in Rockchip RK3128 using Coaxial and Optical combo jack. Cirrus Logic CS8406 Cirrus Logic CS8406
DAC Dual CS4398 Wolfson WM8740 Dual ESS Sabre32 ES9018K2M
High Pass Filter + Voltage Gain stage “SoundPlus” OPA1602 OPA1611 OPA1611
Output Buffer Dual LMH65 or BUF634 None BUF634
Output relay NEC   UD2 NEC   UD2 NEC   UD2

LINE OUT MEASUREMENTS

[separator type=”thin”]
Line Out 10 KOhm
Dynamic Range 112.34 dB
Crosstalk (L) -86.9 dB
Crosstalk (R) -86.2 dB
Output Voltage 1.566 Vrms@0.022%
Frecuency Response

(20Hz – 20kHz)

+/-0.018%
Floor noise -102.93 dBu
SMPTE IMD 0.000392%
CCIF IMD (max) 0.0014%

Fig.4: Summary of the IBasso DX80 Line Out measurements

 

Ibasso-DX80-reproductor-DAC-auriculares-fig29

Fig.5: Frequency Response of the Ibasso DX80

 

Ibasso-DX80-reproductor-DAC-auriculares-fig31

Fig.6: DAC linearity and floor noise of the Ibasso DX80

 

Ibasso-DX80-reproductor-DAC-auriculares-fig32

Fig.7: Output voltage of the Ibasso DX80

 

Ibasso-DX80-reproductor-DAC-auriculares-fig33

Fig.8: THD+N of the Ibasso DX80

 

Ibasso-DX80-reproductor-DAC-auriculares-fig34

Fig.9: Dynamic range of the Ibasso DX80

 

Ibasso-DX80-reproductor-DAC-auriculares-fig35

Fig.10: Crosstalk of the Ibasso DX80

 

Ibasso-DX80-reproductor-DAC-auriculares-fig36

Fig.11: Intermodulation SMPTE of the Ibasso DX80

Ibasso-DX80-reproductor-DAC-auriculares-fig37

Fig.12: Intermodulation CCIFof the Ibasso DX80

Overall, the Line out function performs decently as a good analog source for an external amplifier, with very low noise output (below what the human can hear), lower distortion (particularly at high frequencies) and improved both CCIF and SMPTE  intermodulation compared to the jack output. The IBasso DX80 is as pure as source as a dedicated ODAC RevB (check here).

TIME ANALYSIS

[separator type=”thin”]

Ibasso-DX80-reproductor-DAC-auriculares-fig38

Fig.13: 30Hz Square wave of the Ibasso DX80

Ibasso-DX80-reproductor-DAC-auriculares-fig39

Fig.14: 300Hz Square wave of the Ibasso DX80

COAXIAL OUTPUT MEASUREMENTS

[separator type=”thin”]

After purchasing a TOSLINK to 3.5mm jack adaptor (like this one), we have been able to hook our IBasso DX80 to the optical input of the AP585. You could use a coaxial cable to carry the S/PDIF signal too, but TOSLINK unlike coaxial cables, are immune to ground loops and RF interference. TOSLINK cables may suffer permanent damage if tightly bent, you need to be more careful.

The measurements look as neat as you can imagine from a pure digital signal in an optical format. In the digital world, there are no Volts or Watts, the digital signal goes from -1V to 1V and is measured in dBFS, being +0 dBFS the maximum output of a digital system.

Ibasso-DX80-reproductor-DAC-auriculares-fig40

Fig.16:  Maximum digital S/PDIF output of the Ibasso DX80

Ibasso-DX80-reproductor-DAC-auriculares-fig41

Fig.17:  Zero distortion for the Ibasso DX80 on its S/PDIF optical output

Ibasso-DX80-reproductor-DAC-auriculares-fig42

Fig.18: IBasso DX80 floor noise at -180dBFs (!!) in the Optical S/PDIF output

CONCLUSION

[separator type=”thin”]

This second review emphasizes on the inner design of the Ibasso DX80 and how it focuses on the sound quality through a very careful audio section coupled with high quality components.

As well, we measured the fixed Line Output that achieves lower floor noise and slightly less distortion THD+N than the analog jack, so it highly recommended when you want to use an external amplifier or for an active set of speakers.

Finally, we looked at some measurements on the optical S/PDIF output and highlighted how clean it is. Definitely, the best option if you want to connect the Ibasso DX80 to a superior DAC or AV system at home.[:en]In this second part of the Ibasso DX80 review, we will focus on the additional outputs of the DX80 plus an in-depth analysis of the mainboard design and selection of components. Let’s dig in!

 

INTERNAL DESIGN & ARCHITECTURE

[separator type=”thin”]

As briefly introduced in 1st part of the review, the Ibasso DX80 entails a new platform design. It moves to a newer lower power quad-core chipset based on the Cortex A7 with a frequency of up to 1.3GHz that includes, among others, integrated S/PDIF output used in the coaxial/optical jack at the top of the DX80 (see below).

Ibasso-DX80-reproductor-DAC-auriculares-fig25

Fig.1: Top view of the Ibasso DX80 mainboard.

 

  1. Each side of the Mainboard has one microSD connector for a total of two.
  2. New Cortex A7 based processor helps improving the playback battery life with a minimum of 12/13hrs depending on the load and volume.
  3. It keeps using 512MB Ram which should be plenty for a dedicated music player that doesn’t need multitasking or gaming.
  4. At the bottom of the player, we can see the 6 Nichichon Golden series “reservoir” capacitors that make sure the output audio stage never runs “dry” of current.
  5. On the top view, we have the DUAL DAC CS4398 that is shielded separately from the digital section (other players with this configuration such as the A&K 120 II, cost as much as 3 times the DX80).
  6. One of the big novelties on the Ibasso DX80 is the addition of the USB XMOS receiver that supports up to 32bits/384KHz in PCM mode and native DSD( DSD64 (2.8MHz), DSD128 (5.6MHz), DSD256 (11.3MHz), DSD512 (22.6MHz)). In order to find a portable music player with such capability you need to jump up to an Astell&Kern AK240 (at 2500 USD, you can buy 6 or more DX80…).
  7. Output stage is designed around dual supply IC that generates around +/-5.1V (with the help of an extra pair of Nichichon GOLD SERIES capacitors) for the dual OPA1602 as voltage gain and dual LMH/BUF current buffer output.
  8. It keeps the output relay from the DX50/90 family to block any “pops” at start or shutdown of the player.

 

Ibasso-DX80-reproductor-DAC-auriculares-fig26

Fig.2: Bottom view of the Ibasso DX80 mainboard

 

COMPARISON OF THE IBASSO DX80, DX50 AND DX90

[separator type=”thin”]
DX80 DX50 DX90
SoC CPU Quad-Core ARM      Cortex-A7

Rockchip RK3128

Single-Core ARM Cortex-A9

Rockchip RK2926

Dual-Core ARM    Cortex-A9

Rockchip RK3026

RAM memory 4 Gb 16 bits DDR3 SDRAM 4 Gb 8 bits DDR3 SDRAM 4 Gb 16 bits DDR3 SDRAM
FLASH memory Samsung 8GB (fully enabled for the OS) SK Hynix 8GB MLC NAND

 

Micron 8 GB MLC NAND

 

Battery and SoC Power Management IC Richtek RT5037 X-Power APX202 X-Power APX202
USB controller XMOS XS1-L6A supports PCM up to 32/384KHz and DSD64/128/512 Integrated inside Rockchip RK2926 limited to PCM 24/192KHz and no DSD Integrated inside Rockchip RK2926 limited to PCM 24/192KHz and no DSD
S/PDIF output Integrated in Rockchip RK3128 using Coaxial and Optical combo jack. Cirrus Logic CS8406 Cirrus Logic CS8406
DAC Dual CS4398 Wolfson WM8740 Dual ESS Sabre32 ES9018K2M
High Pass Filter + Voltage Gain stage “SoundPlus” OPA1602 OPA1611 OPA1611
Output Buffer Dual LMH65 or BUF634 None BUF634
Output relay NEC   UD2 NEC   UD2 NEC   UD2

 

LINE OUT MEASUREMENTS

[separator type=”thin”]
Line Out 10 KOhm
Dynamic Range 112.34 dB
Crosstalk (L) -86.9 dB
Crosstalk (R) -86.2 dB
Output Voltage 1.566 Vrms@0.022%
Frecuency Response

(20Hz – 20kHz)

+/-0.018%
Floor noise -102.93 dBu
SMPTE IMD 0.000392%
CCIF IMD (max) 0.0014%

Fig.4: Summary of the IBasso DX80 Line Out measurements

 

Ibasso-DX80-reproductor-DAC-auriculares-fig29

Fig.5: Frequency Response of the Ibasso DX80

 

Ibasso-DX80-reproductor-DAC-auriculares-fig31

Fig.6: DAC linearity and floor noise of the Ibasso DX80

 

Ibasso-DX80-reproductor-DAC-auriculares-fig32

Fig.7: Output voltage of the Ibasso DX80

 

Ibasso-DX80-reproductor-DAC-auriculares-fig33

Fig.8: THD+N of the Ibasso DX80

 

Ibasso-DX80-reproductor-DAC-auriculares-fig34

Fig.9: Dynamic range of the Ibasso DX80

 

Ibasso-DX80-reproductor-DAC-auriculares-fig35

Fig.10: Crosstalk of the Ibasso DX80

 

Ibasso-DX80-reproductor-DAC-auriculares-fig36

Fig.11: Intermodulation SMPTE of the Ibasso DX80

 

Ibasso-DX80-reproductor-DAC-auriculares-fig37

Fig.12: Intermodulation CCIFof the Ibasso DX80

Overall, the Line out function performs decently as a good analog source for an external amplifier, with very low noise output (below what the human can hear), lower distortion (particularly at high frequencies) and improved both CCIF and SMPTE  intermodulation compared to the jack output. The IBasso DX80 is as pure as source as a dedicated ODAC RevB (check here).

 

TIME ANALYSIS

[separator type=”thin”]

Ibasso-DX80-reproductor-DAC-auriculares-fig38

Fig.13: 30Hz Square wave of the Ibasso DX80

 

Ibasso-DX80-reproductor-DAC-auriculares-fig39

Fig.14: 300Hz Square wave of the Ibasso DX80

 

COAXIAL OUTPUT MEASUREMENTS

[separator type=”thin”]

After purchasing a TOSLINK to 3.5mm jack adaptor (like this one), we have been able to hook our IBasso DX80 to the optical input of the AP585. You could use a coaxial cable to carry the S/PDIF signal too, but TOSLINK unlike coaxial cables, are immune to ground loops and RF interference. TOSLINK cables may suffer permanent damage if tightly bent, you need to be more careful.

The measurements look as neat as you can imagine from a pure digital signal in an optical format. In the digital world, there are no Volts or Watts, the digital signal goes from -1V to 1V and is measured in dBFS, being +0 dBFS the maximum output of a digital system.

 

Ibasso-DX80-reproductor-DAC-auriculares-fig40

Fig.16:  Maximum digital S/PDIF output of the Ibasso DX80

 

Ibasso-DX80-reproductor-DAC-auriculares-fig41

Fig.17:  Zero distortion for the Ibasso DX80 on its S/PDIF optical output

 

Ibasso-DX80-reproductor-DAC-auriculares-fig42

Fig.18: IBasso DX80 floor noise at -180dBFs (!!) in the Optical S/PDIF output

 

CONCLUSION

[separator type=”thin”]

This second review emphasizes on the inner design of the Ibasso DX80 and how it focuses on the sound quality through a very careful audio section coupled with high quality components.

As well, we measured the fixed Line Output that achieves lower floor noise and slightly less distortion THD+N than the analog jack, so it highly recommended when you want to use an external amplifier or for an active set of speakers.

Finally, we looked at some measurements on the optical S/PDIF output and highlighted how clean it is. Definitely, the best option if you want to connect the Ibasso DX80 to a superior DAC or AV system at home.[:]

Headphoniaks Team
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