|
QA390LE/MOD(QA390V2) Movable Desktop Player |
|
The QA390LE is completely sold out, and the currently available model is the QA390MOD.
|
1. It shares identical circuitry and materials with the QA390LE, including:
a. Equipped with dual AS338 global clocks.
b. Utilizes the ES9038PRO DAC chip.
c. Supports high-definition Bluetooth input comparable to local playback with LDAC.
d. Features the same power supply optimizations as the QA390LE.
e. Incorporates the same analog circuit optimizations as the QA390LE. |
2. The main difference between the QA390MOD and the QA390LE lies in the production process; the QA390MOD adopts a more mass-production-friendly process instead of the limited-edition process.
3. Externally, the QA390MOD does not have the limited-edition numbered plaque.
4. In terms of sound quality, the QA390MOD is very close to the QA390LE, with only a slight difference in richness, achieving an overall similarity of over 95% (most audiophiles may not easily discern the difference).
|
How to distinguish between the QA390MOD and the standard QA390:
1. The QA390MOD has the "MOD" label printed at the bottom right corner of the glass lens.
2. The QA390MOD features a special "MOD by Quloos" sticker on the left side of the device.
3. Since the currently produced QA390MOD uses the same ES9038PRO version PCB as the QA390LE, the DC input socket is the same rose red color as the ES9038PRO version (the original AK4497 version had a black DC socket).
4. The currently produced QA390MOD, in addition to the regular black and red models, also includes a titanium gray version identical to the limited edition, making it easier for users to pair with the QH1 headphone amplifier. |
|
 |
|
|
|
 |
From the first
limited edition product QA360LE released by QLS fiver
years ago to the introduction of the second limited
edition today, Clark has been improving the product 's
sound quality during use this standard version. If the
improved sound has achieved the level that he couldn’t
wait to share, we might launch the modified edition in
the market. Since Clark has been using some non-mass
production techniques with low efficiency, we have to
use more human resources and only provide limited
products, in order to maintain high-quality sound.
Two years
after the QA390 standard edition released to the market,
the QA390LE (limited edition) emerged. Although it is
coincidental and lucky that we can make such great sound
improvements, we will definitely deliver more mature
products with better sound effect through the long-term
try and modify of Clark.
|
 |
|
What does the limited edition
upgrade? |
 |
Global
Clock
Upgrade to AS338, the jitter has been reduced
from 88fs to 38fs, thus greatly improving
low-frequency quality in hearing, providing
impressive and majestic low-frequency heavy
sound.
|
|
|
|
Alternative
DAC
The
AK4497 that has halted production is replaced by
ES9038PRO. Due to the honing more than a year,
the alternative chip can bring excellent sound
quality and audio experience.
|
 |
|
|
Note: Although the DAC chip
is changed, it contributes very little to the sound
improvement. In fact, after the AK4497 is used up in the
future, the QA390 standard version may also be directly
change DAC chip to ES9038PRO without changing the price.
|
|
 |
Upgraded Bluetooth
It is
compatible with more encoding formats. Through
optimized design, the AS338 global clock is used
to recollect data. After upgrade, the sound
input through Bluetooth is better than the
internal SD card played by the standard edition.
|
|
|
|
Power Optimization
It
compensates the frequency bandwidth of
super-capacitor, reduces the power supply
internal resistance, and increases the power
isolation of digital circuit and analog circuit,
to improve the dynamic feature, ductility and
permeability of sound.
|
 |
|
|
 |
Analog Circuit
It
optimizes analog circuit design and component
selection again, further improves sound density
and details, and provides more open sound scenes
and better sound with sense of depth, stereo and
space.
|
|
|
|
Readjust
sound
It
collects feedback concerning the standard
edition, and conducts a second toning to make
the sound more complete. It focuses on the
musicality, freshness, true nature and fullness
of music, and ensures that music can be listened
to for a long time without being annoying.
|
 |
|
|
Clark’s comment: The sound
of the limited edition is not the simple upgrade of that
of the standard edition QA390, It’s more like a brand
new product with completely different sound levels. The
limited edition provides fresh sound with first-class
musicality. Its full and heavy mid-low frequency sound
is rather impressive. The exquisite sound effects make
people feel like being in a concert scene.. Most
importantly, it can present the sound with great
momentum and dynamics that seemingly do not match its
appearance. It’s a device that can enable people totally
lost in music.
|
|
|
 |
|
|
Limited to 600 units
worldwide, numbered 001-600, numbered S01-S50 as the
reserved audition prototype, and each device has a
unique number and Clark’s signature (it is laser printed
on a metal nameplate).
|
 |
|
Parameter Differences between the
Limited and Standard Edition |
1. Audio test parameters
include distortion, signal-to-noise ratio, dynamic
range, separation, which are basically the same with the
standard edition(the headphone amplifier output power of
the limited edition will be greater）.
2. Due to the high power
consumption of ES9038PRO, the battery life of the
limited edition is reduced by 1.5 hours, and the entire
device can operate about 8.5 hours.
3. Due to the internal
functions of ES9038PRO, the “Output Phase” in the menu
of the limited edition does not work.
|
 |
|
|
|
Power
circuit design that is lower than battery noise
For the power supply
of digital circuits, the battery is not clean enough. In
order to solve this problem, we use a lot of LT3045 chips
with much lower noise than the battery in QA390, completely
eliminating interference from power supply.
|
 |
The noise of this
chip is only 0.8μVRMS, which is much lower than the noise
when the battery is working (the noise is about 2.7uV when
the 3.7V lithium battery has a 500mA load). At the same
time, the chip has a low frequency of nearly 100dB and a
high of 76dB at 1MHz. The power supply ripple rejection
capability eliminates interference from power supplies.
|
|
|
|
Can be used as a relative
reference standard for ideal sound |
Unconstrained by the volume, the battery generates a set of
desktop-level isolated regenerative power supply, which
solves the problem that the traditional AC power supply is
affected by the power environment, making the sound more
stable and stable, so that all users can hear the sound we
want to express.
The
QA390's battery-powered sound is largely unaffected by
any external factors and is ideal as a relative
reference for good sound.
|
|
Four 3300mAH Panasonic (formerly Sanyo)
18650 batteries provide a total battery
capacity of 13200mAh
|
|
|
The four-way fast charging chip
independently charges each battery. The
ideal diode + ultra-low internal
resistance MOSFET is used for discharge
management to ensure sound quality. |
|
| |
|
|
You can use the existing mobile phone
charger (including fast charge) or
charging treasure to charge the machine,
easy to use |
|
|
Perfect battery overcharge, over
discharge, over current, short circuit
and over temperature protection circuit
to ensure safe use |
|
|
|
|
|
|
|
|
Two super capacitors, supplemented by multiple isolated
ultra-low noise power circuits |
Dual 1000000uF low internal resistance super capacitor
support for digital and analog partial isolation power
supply, similar to desktop dual transformer design
|
 |
|
|
|
Completely different from
the battery circuit of the portable |
Most of the batteries used in
portable players are limited to 2 ~ 3A, which makes the
sound scale, dynamic and momentum less natural than desktop
players. The battery used in the QA390 can achieve a single
discharge current of 10A, and we use multiple parallels to
further reduce the internal resistance while the current
capability is several times. This current explosive force
exceeds many machines that use 220V power supply.
In addition, the analog and
digital inlets of the power supply circuit each have a
1000000uF super capacitor, which provides further
protection for the instantaneous current. The built-in
very good power supply system is the basis of its good
sound.
|
|
|
|
ALL To DSD mode, Listen more than CD
|
|
ALL To DSD mode can upgrade all formats to 1Bit, 5.6448MHz,
DSD128 high resolution, even if the original signal is PCM. |
|
The following square wave output
analysis is the measured figure.
|
|
PCM
output square wave analysis figure |
PCM To
DSD output square wave analysis figure |
|
By the comparison of the above
measured wave forms, we can find that ALL To DSD is more
purified and has less harmonic distortion than the
original PCM direct output signal.
|
|
|
|
11 selected op amps in the analog section + 8 dual-current
transistors
provide high-density, Delicate, Open, Imposing
Sound |
 |
|
Programmable
analog potentiometer volume control
solves left and right
imbalance and digital loss |
Lossless analog volume adjustment ensures
good sound quality at low volume: the adjustment
range is wide, the adjustment process is very
thin, and the left and right channels are almost
completely balanced, thus achieving a wide range
of precise control of the volume.
The pursuit of good sound is also reflected
in every detail, QA390 uses the PGA2311UA with
higher price and lower distortion rate instead
of PGA2311U.
|
 |
|
|
|
 |
|
MCU or DAC chip directly
controls the volume by the digital |
|
|
|
 |
|
Balance of the left and right |
|
|
Digital volume will compress and
reduce the number of bit, small volume loses the
signal conversion accuracy severely. |
|
0 cost |
|
|
 |
|
Common precise
potentiometer |
|
|
|
 |
|
Balance of the left and
right |
|
|
Unbalanced left and right will
cause biased sound, the imaging is not clear, and
the unbalance reaches to +/-3% |
|
The cost is increased less than $1 |
|
|
 |
|
PGA2311UA programmable
analog potentiometer |
|
|
|
 |
|
Balance of the left and
right |
|
|
The analog potentiometer
controlled by programme achieves the left and right
balance of +/-0.05dB |
|
The cost is increased more than
$10 |
|
|
|
|
Features |
1. A truly mobile
all-in-one machine designed with a
large-capacity battery and a current and voltage
in the machine according to the standards of
high-end desktops.
2. Double 1000000uF low internal resistance
super capacitor blessing for digital and analog
part of the isolated power supply, similar to
the desktop dual transformer design.
3. The balanced amp can output more than 20V,
which is convenient for driving high-impedance
headphones.
4. The final stage power tube current output
capability is 2700mA, which promotes the
low-impedance low-sensitivity headphones.
5. The DAC chip uses
ES9038PRO × 1 and supports
ALL To DSD.
6. Two AS338 femtosecond crystal
designs, high-speed precision-controlled CPLD clock
processing, and global unified clock.
7. Built-in single-chip single-threaded SD card
pure music player.
8. 5.0 HD Bluetooth input,up
to 24bit 96Khz
for easy connection to mobile phones.
9. Two-way USB interface, all the way to the
phone or tablet (no camera kit required), all
the way to the Italian Combo384 to access the
computer.
10. Four 3300mAh Panasonic (formerly Sanyo)
18650 batteries provide a total battery capacity
of 13200mAh.
11. More than 30 ultra-low noise power chips
provide a clean enough power for each circuit
device.
12. Headphone port is complete, single-ended:
3.5, 6.35; balanced: 2.5, 3.5, 4.4, XLR.
|
|
|
|
Product Positioning |
1. Don't care about volume
and weight, the pursuit of sound is uncompromising, and
you want to experience the sound quality of a large
machine on a mobile machine.
2. Frequent business trips, participation in various
parties, events, offices, homes, study, living room,
bedside and other enthusiasts with mobile needs.
3. A user who wants to go out with a big headphone.
4. Use on the desktop, want to push the big headphones
more easily and get a good voice.
5. High-end desktop users who don't want to invest too
much money to toss around the wire, electricity, etc.,
and want to get good sound quality.
6. Very good sound quality desktop unit, can replace
your front-end source, can be directly connected to the
active speakers or connected to the amplifier to drive
passive speakers.
7. The digital and analog outputs are first-class, can
be used as a digital turntable or decoded to meet the
high sound quality requirements of multiple scenes.
8. The following scenario:
(a) If you have invested a lot of money in your desktop
system power supply and wire matching, but the sound is
still not satisfactory, I suggest you try the
battery-powered QA390, its sound can at least give you a
reference.
(b) If your desktop system is sometimes nice, sometimes
not good, one sound during the day, another sound in the
middle of the night, or a good period of time and not
good for a while, it proves that the electrical
environment has a great influence on the sound of your
system, completely immune to electricity. The QA390 for
environmental impact must be tried.
|
|
Application scenario |
|
 |
|
QA390MOD is widely used and is not limited to
the above applications.
More applications can be consulted
by technicians. |
|
|
|
Specifications |
• Internal playback storage
media: use an external SD card or TF card plus card
sleeve in FAT32 format, currently supports a maximum
capacity of 512GB(Sandisk TF or SD card is recommended)
• Internal playback support: 16 - 32Bit, 44.1KHz ~
352.8KHz, DSD64 ~ DSD128.
• USB interface - USB B port: use the authorized Combo 384, support 32Bit / 384KHz PCM and
DSD256
• USB interface--Micro port: use SA9227 interface, Apple
phone and tablet do not need camera kit, support 32Bit /
384KHz PCM and DSD128
• Bluetooth: Supports Bluetooth 5.0, supports HD
Bluetooth up to 24Bit / 96KHz
• Coaxial input: 75Ω matched impedance, support 24Bit /
192KHz and DSD64(DoP)
• Optical Input: Supports 24Bit / 192KHz and DSD64（DoP)
• Coaxial output: 0.5Vp - p75Ω, support 24Bit / 192KHz
and DSD64(DoP)
• Optical output: support 24Bit / 192KHz and DSD64(DoP)
• Analog output:
Frequency response: 20 - 20KHz
S / N: 122dB
Dynamic range: 121dB
Stereo Crosstalk：120dB
THD+N：0.0005%
• Output level:
RCA (L&R) 2.5V (closed pre-amp)
XLR (L&R) 5.0V (closed pre-amp)
SE (Unbalanced)maximum 10.5Vrms(High amp voltage, Ultra high
gain, 600Ω load)
BAL(Balance)Maximum 21Vrms（high amp voltage, ultra high gain,
600Ω load)
• Headphone matching impedance: 8Ω - 600Ω
• DAC: ES9038PRO x 1
• Volume control (including preamp volume control):
PGA2311UA
• Reference clock jitter: 0.038 picoseconds (38
femtoseconds)
• Charging port: Available Type-C port, DC port
available, QC2.0 quick charge.
• External power supply: DC 5.5*2.1 port, can also be
charged (panel switch selection)
• Life time: 8 ~ 9 hours (depending
on settings, music format, load condition)
• Charging time: Type-C common charge: 8 ~ 9 hours,
Type-C fast charge / DC port: 4 ~ 5 hours
• Host & Remote Control Material: All-aluminum CNC
integrated milling
• Product weight: 3.1kg in full package, net weight
1.82kg
• Machine size: 20cm x 18cm x 4.45cm, Packing size: 33cm
x 27cm x 9cm
|
Single-ended headphone port rated output power
|
| 32Ω |
300Ω |
600Ω |
| 1900mW / ch |
360mW / ch |
180mW / ch |
| High amp voltage
and high gain |
High amp voltage
and supper high gain |
High amp voltage
and supper high gain |
|
Balance headphone port rated output power
|
|
32Ω |
300Ω |
600Ω |
|
2800mW / ch |
1200mW / ch |
720mW / ch |
|
Medium amp voltage and supper high gain |
High amp voltage and supper high gain |
High amp voltage and supper high gain |
|
|
|
|
Audio
Formats |
| Local play (SD card) |
Audio |
Bit depth, Sample Rate |
Container, Encoding, Compression |
| WAV |
64Bit / 192KHz, 24Bit / 352.8KHz |
Fixed-point, Floating-point |
| AIFF |
24Bit / 352.8KHz |
|
| FLAC |
24Bit / 352.8KHz |
Level 0~8 |
| ALAC |
24Bit / 48KHz |
M4A Container |
| WavPack |
24Bit / 48KHz |
Fast / Normal / High / High Plus |
| APE |
C1000: 24Bit / 192KHz
C2000: 24Bit / 192KHz
C3000: 24Bit / 192KHz
C4000: 24Bit / 96KHz |
Fast / Normal / High / Extra High |
| TTA |
24Bit / 48KHz |
|
| DIFF |
DSD64 - DSD128 |
Not support DST encoding |
| DSF |
DSD64 - DSD128 |
| SACD-ISO |
DSD64 |
| MP3 |
16Bit / 48KHz, 96-320kbps |
CBR / VBR / ABR encoding |
| AAC |
16Bit / 44.1KHz |
M4A Container,
AAC LC / SBR encoding |
| DTS |
16Bit / 44.1KHz |
WAV Container, DTS-5.1/DTS-ES |
| CUE |
ANSI / Unicode / Unicode
Big-endian / UTF-8 encoding |
| USB-PC |
PCM 32Bit /
384KHz, DSD256 |
| USB-Phone |
PCM 32Bit /
384KHz, DSD128 |
| Blue-tooth |
Supports Bluetooth 5.0, Supports HD Bluetooth up to 24Bit / 96KHz |
| Coaxial / optical input |
PCM 24Bit /
192KHz, DSD64 (DoP) |
| Coaxial / optical output |
PCM 24Bit /
192KHz, DSD64 (DoP) |
|
|
|
|
Front
panel |
 |
|
NO. |
Function
instruction |
| A |
Power
switch |
| B |
DC IN charging selector switch |
| C |
Off-screen
indicator (this light is on when the screen is
off) |
| D |
Charging
status indicate lamp |
| E |
Infrared
remote receive window |
| F |
XLR
balance output port |
| G |
Volume
knob (can control the headphone output and
PRE-AMP function volume) |
| H |
Balance
headphone output port (suitable to 2.5/3.5/4.4
insert needle) |
| I |
Single
end headphone output port (suitable to 3.5/6.35
insert needle) |
|
 |
|
NO. |
Function
instruction |
| A |
XLR balanced output right
channel |
| B |
XLR balanced output left channel |
| C |
RCA output right channel |
| D |
RCA output left channel |
| E |
RCA coaxial digital output |
| F |
RCA coaxial digital input |
| G |
Optical
digital output |
| H |
Optical
digital input |
| I |
USB input
- connect the phone (no camera kit required) |
| J |
USB input
- connect to the computer |
| K |
Type-C
charging input (support fast charging) |
| L |
Power
input (Power supply & Fast charge) |
|
|
Dimensions |
 |
 |
 |
 |
|
Product
List |
1. QA390MOD(QA390 V2) HIFI Player x 1
2. 64GB TF card (with card holder) or SD card x 1
3. USB3.0 card reader x 1
4. USB A port to B port USB cable x 1
5. TYPE-C charging cable x 1
6. External power supply (can be used for charging) x 1
7. Infrared remote control x 1
Note: The USB cable connected to the mobile phone
is not standard. If you need a friend, please contact
customer service to purchase.
|
|
Price: USD $1999.00
(Not included shipping)
|
|
|
Tip:
We will send good by Express , about need 7-15 working days for the rest of the world, and we will send Tracking Numbe for you, and we will declare the sending for gift with a low value(For example: USD $100.00), to reduction reciever side to pay tax or try to avoid reciever side to pay tax.
|
|
|
|
