AMP

The Quloos QA390 is a hi-fi lossless music player, DAC, decoder, and headphone amplifier combined into an all-in-one mobile unit. It is powered by four 3300mAh Panasonic 18650 batteries that makes for a truly mobile hi-fi unit with 8-10 hours of high quality music listening.

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• Puristic Class-A Headphone Amplifier
• Balanced / Single-Ended Output
• Three Gears of Gain Adjust
• 8pcs Power Transistors in 4 Groups
• Frequency Response: 20 - 200K +/-0.3dB

• 4th Generation of T1 Series
• Hi-Res up to 32bit/768k and DSD512
• aptX HD Bluetooth
• DAC-Chip ES9038Q2M
• 6922 EH Vacuum Tube

• Hi-Res up to 32bit/768k and DSD512
• Supports Apple / Android / PC
• 400mA Battery up to 8 hours
• Fuly Discrete Amp Circuit
• No-screw Uni-Body-Design

• Portable Class A Amplifire
• Ultra Low Distortion
• +/- 9V amp Design
• No-screw Uni-Body-Design

•  DAC: Asahi Kasei AK 4375a × 2 
•  Input: Bluetooth A2DP or USB DAC 
•  USB DAC: USB Audio Class 1.0 (Up to 48 kHz / 16 bit)
•  Output:  3.5 mm (Unbalanced) /  2.5 mm (Balanced / 4-Pin) 
•  Output Level:  3.2 Vpp (Unbalanced) /  6.4 Vpp (Blanced) 
•  Output Impedance: 1 Ω (Unbalanced / Blanced) 
•  SNR:  109 dB (Unbalanced) /  110 dB (Blanced)
•  Bluetooth Version: 5.0 
•  Profile: HFP / HSP / A2DP / AVRCP / LDAC
•  Corresponding Codec: aptX / aptX HD / AAC / SBC 
•  Maximum Communication Distance: about 10 m
•  Battery Capacity: 350 mAh (Lithium Polymer) 
•  Continuous Playing Time: about 14 hours 
•  Body Size: (W) 30 × (H) 53 × (W) 15 mm
•  Body Weight: about 20 g

• DAC chip: AK4377
• Inputs: USB-C
• Outputs (3.5 mm): Standard (0.914 Vrms), High Power (2.26 Vrms)
• Output Impedance: < 1 Ω
• THD + N (Standard): -105 dB (0.00056%)
• THD + N (High Power): -102 dB (0.00079%)
• Dynamic range (Standard): 118 dB
• Dynamic range (High Power): 118 dB
• Sample rates: Up to PCM 32-bit 384 kHz, DSD128 (DoP)
• Desktop compatibility: Mac OS 10.10 or later, Windows 7 (32/64-bit) or later
• Mobile compatibility: iOS 10.3.3, iPhone 6 or later, Android 6.0 or later
• Dimensions: 1.8 x 1.3 x 0.3 in (4.5 x 3.2 x 0.8 cm)
• Weight: 0.8 oz (21.5 g)

• The new design SC-6LS MK2 deployed advanced vacuum tubes, coupling capacitor, carbon film resistor and a variety of high-class components. Effectively improved performance and audio quality. Collocated with 9084D MK2, creates the evolutionary home audio system concept.
• Constructed linear amplifier circuit with FOUR Electro-Harmonix 12AU7EH Preamp Tubes.
• Advanced rectifying circuit with TWO RCA 22DE4 Rectifiers.
• Deploys Multicap Coupling Capacitors & Takman Carbon Film Resistors.
• Designed for 15dB gain.
• Customized EI-Core Power Transformers.

• ESS DAC ES9038PRO chip,with TOPPING elaborate design and adjustment,the distortion is ＜0. 00010％,DNR ＜126dB,and SNR ＜126dB.
• CSR8675 chipset to support Bluetooth 5.0 and LDAC/AAC/SBC/APTX/APX LL/APX HD protocol. DX7 Pro could achieve 24bit 96KHZ HD transmission
• XMOS XU208 and Thesycon customized driver(Win 7 and above)gives the DX7 Pro superior decoding capability on USB;PCM support up to 32bit 768KHZ and DSD support to DSD512(native).
• USBIN: 44.1 kHz-768kHz/16bit-32bit DSD64-DSD512(Native). DSD64-DSD256(DOP)
• OPT/AES/COAX: 44. 1kHz-192kHz/16bit-24bit, DSD64(DOP) 
• IIS IN: 44.1kHz-768kHz/ 16Bit-32Bit、DSD64-DSD1024

• The power of A50 is stabilized by the TI TPS7A33/47 low-noise linearregulator. It provides continuous pure power supply for A50.
• Recommended to use with P50 linear powersupply for further improvement. Perfect match for power amplifier/active speaker. 15V output for A50,and the 5V outout for D50s so that to make a delicate system.
• A50 digitizes the volume knob position, and transmits the data to RC1195 forecision volume controlling.
• The two LME49720 OP-AMPS of A50 are equipped with socket for thoseexperienced Diyers to replace their desired DIP-8 OP-AMP so as to achieve different sound.
• The outer casing is designed with the rmal conductive column to dissipate heat fromthe power supply and OP-AMP through the entire outer casing.

• Full balanced + SE headphone output---A90 has three output headphone jacks of 4-pin-XLR，4.4 balanced and 6.35 SE to meet different usages.
• A90 is provided with a wide range of adaptation to headphones.---The SE 25Vpp / balanced 49Vpp high output voltage along with high output current & less than 0.1 Ohm output impedance,
• A90 is equipped with three gain settings of -9.5dB/ 0dB / 9.5dB for SE and -35dB / 6.0dB / 15.5dB for balanced. The noise of merely 0. 2uVrms makes A90 easily adapt to all types of headphones from extremely sensitive IEMs to most power demanding full sized over-ears.
• It's a great companion of active monitors stacked with D90 DAC when A90 work as pre-amp application.
• DAC + Pre-amp appplication