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Product function introductionA977 passive preamp active speaker volume dual-channel controller is small in size and suitable for active speakers or preamp/post-amp, it supports full-balance or input and output of single-ended signal. The product has functions of independent L/R channel volume adjustment, 2 signals input and 2 signals output. It provides balanced XLR and unbalanced RCA connectors which are automatically converted to each other, with a selector switch facilitates the signal switch of input/output.Small size, big intelligence. The product is of small size, but has well-function connecters. It is suitable for decoders and speakers without volume adjustment. the product has the design of balanced input/output and RCA input/output architecture, with switching function. The operation of the product will not cause loss of signal source. Generally, the audio signal released from the decoder is the original sound source signal. Great dynamics will not cause loss of sound quality, retaining the complete original signal source.Product parametersInput/output impedance: 10KΩ - 50KΩ2 in 2 out switchover, unbalanced RCA connector and balanced XRL connector for input/outputInput: unbalanced RCA connector / balanced XLR connector (convert selection)Output: unbalanced RCA connector / balanced XLR connector (convert selection)Product net weight: 0.32 kgProduct package weight: 0.42 kgProduct dimensions: length 145mm X width 65mm X height 43mmPackaging dimensions: length 200mm X width 180mm X height 55mmKit list1 X A977 2 In and 3 Out Switcher Full-balance Passive Preamp Active Speaker Double Sound Source Volume ControllerSpecification: Package Weight One Package Weight 0.48kgs / 1.06lb One Package Size 16cm * 16cm * 5.5cm / 6.3inch * 6.3inch * 2.17inch Qty per Carton 35 Carton Weight 15.00kgs / 33.07lb Carton Size 52cm * 52cm * 17cm / 20.47inch * 20.47inch * 6.69inch Loading Container 20GP: 580 cartons * 35 pcs = 20300 pcs40HQ: 1346 cartons * 35 pcs = 47110 pcs

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About The Product1. LINEPAUDIO A962 fancier-level HiFi Vacuum Tube Power Headphone Amplifier PreAmp, made of Beijing classic quality 6J9-J vacuum tube, USB-PC supported ASIO sound effect software will give out more professional, full, open-stage, soft and smooth sound, especially applicable to voice, string music, light music, and classical music, the performance of different frequency points is so perfect! Fine at high frequency, strong at low frequency! Easily drive 16??-600 ?? headphone of any class, quiet background without any current background noise! Two sets of audio signal inputs, one is USB signal input (USB-PC), USB cable is connected to PC, plug and play without a drive, directly used as an upscale USB external sound card. The USB port can be also connected to any model of Android mobile phones with OTG function. The other is 3.5mm interface audio signal input and you can connect it to mobile phone, CD, lossless music player or other audio source devices. In case of simultaneous inputs of USB signal and 3.5mm interface signal, 3.5mm interface signal input is preferred. 2. LINEPAUDIO A962 has three sets of audio signals, simultaneously output to meet the interface of different devices (RCA/3.5mm/6.35mm), the output end will deliver to you a real HiFi experience, whether connected to your upscale headphone or speaker, or used as a timbre adjustable PreAmp to connect your digital power amplifier, multimedia speaker or various stereo devices, what a real PreAmp. Of course, if you want to try the timbre style of different tube amplifiers, this product can fully meet your requirement, compatible with E180F, 6688 and other tube models, you may exchange at will. 3. Many music fanciers are concerned about the background noise of vacuum tube headphone amplifier, but this product frees you from this concern, its performance in controlling background noise is extraordinary, the background is quiet after several tests and optimizations of the circuit design, without any current background noise, you will hear the purest, most natural, and most nostalgic sound. As to the testing of the current background noise: as it is known to all, the current background noise comes from two sources, one is the vacuum tube headphone amplifier, the other is the audio source or the audio cable (the audio cable makes it more likely to generate background noise), the correct procedure of testing the headphone amplifier is to disconnect the audio input cable, with power on, if the background of the headphone amplifier is quiet, it indicates that the headphone amplifier has a very high SNR. If unquiet, or this seriously affects you from listening music, it indicates that the headphone amplifier has a very low SNR. 4. Notes: An electronic interference device near the desktop may also affect the SNR. For example, if the vacuum tube power amplifier is placed near a wireless router or device, it may be interfered to some extent. Enclosed by an aluminum shell, miniaturized but exquisite, the front, rear panel is precisely processed by CNC machining center, you will get a terrific handle, the ultra-small volume will not occupy your desktop space too much. More than a multi-functional upscale high-fidelity USB sound card vacuum tube headphone amplifier, it is also a beautiful desktop ornament. All letters on the machine panels are printed using expensive laser carving and will never fade off.Features1. 2 sets of signal inputs (USB-PC and 3.5mm input), 3.5mm input is preferred. 2. 3 sets of stereo signal outputs: 3.5mm / 6.35mm / RCA simultaneous signal outputs, allowing you to connect different device interfaces. 3. USB: PC Supported ASIO sound effect software (ASIO drive to be installed) 4. Input power: >=1100mW (32ohms). 5. Matched headphone impedance: 16ohms-600ohms. 6. Frequency response: 20 kHz - 30kHz. 7. Support sampling rate: 16Bit - 32k Bit, 44.1kHz, 48kHz.Specification: General Model A962 Material Metal Input Impedance 16ohms-600ohms headphone SNR > = 110dB Distortion < 0.005% Frequency Response 20 kHz - 30kHz Size 98*94*29mm Weight 398g Package Include Package Contents 1 x Amplifier 1 x AC Power Adapter Charger 1 x USB Cable Package Weight One Package Weight 0.54kgs / 1.20lb One Package Size 20cm * 18cm * 5.5cm / 7.87inch * 7.09inch * 2.17inch Qty per Carton 20 Carton Weight 10.96kgs / 24.16lb Carton Size 42cm * 38cm * 30cm / 16.54inch * 14.96inch * 11.81inch Loading Container 20GP: 556 cartons * 20 pcs = 11120 pcs40HQ: 1292 cartons * 20 pcs = 25840 pcs

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Product function introduction 1. The B981 is a powerful 8-channel high-power pre-amplifier which has dual-sound input with a selector switch. 2. The product provides an independent 3.5mm stereo earphone jack which can drive a variety of high-impedance professional monitor earphones well. 3. Each channel can drive 16ohm -600 ohm and provide 8 stereo channels for output. 4. There are four independent volume knob adjustments to control the 8-channel for simultaneous level signal output, presenting the rich sound quality, well-balanced bass, clear high frequency, and no other signal popping phenomenon, and ensuring lossless and undistributed sound. 5. It can provide +20dB high gain through any line level signal source, allowing running through longer cable lines or "buffering" to solve low volume problems. 6. You can use the product to connect line level signal source and power amplifier as a volume controller. 7. The RCA socket can match almost all other product interfaces. The product is powered by an AC AC9V transformer. Product parameters 1. Input impedance: 100K Ohm 2. Input level: +14 dBV 3. Output impedance: 47 Ohm per output channel 4. Frequency response: 20 Hz - 20K Hz 5. Signal to noise ratio: Above 107dB 6. Total harmonic distortion: Less than 0.08% 7. Inter-modulation distortion: Less than 0.01% 8. Signal input: Two sets of stereo RCA socket 9. Signal output: Six sets of stereo RCA connectors and two sets of 3.5mm stereo earphone jack 10. Product power supply: AC 9V-12V 11. 4 independent channel stereo level volume output controlling knobs 12. Product net weight: 0.68kg 13. Packaged product weight: 0.82g 15. Product dimensions: Length 145mm x width 112mm x height 42mm 16. Packing dimensions: Length 260mm x width 185mm x height 65mm Kit list 1. B981 Professional 8-channel preamp signal-amplifier speaker distributor x 1 2. AC9V Power adapter (US standard) line length 100CM x 1Specification: Package Weight One Package Weight 0.89kgs / 1.97lb One Package Size 26cm * 18.5cm * 6.5cm / 10.24inch * 7.28inch * 2.56inch Qty per Carton 18 Carton Weight 15.00kgs / 33.07lb Carton Size 68cm * 48cm * 17cm / 26.77inch * 18.9inch * 6.69inch Loading Container 20GP: 480 cartons * 18 pcs = 8640 pcs40HQ: 1115 cartons * 18 pcs = 20070 pcs

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ZK-LT22:1. Bluetooth version: 5.12. Bluetooth transmission distance: 10m3. Audio input: Bluetooth + AUX + U disk + USB sound card4. Audio output: 15W for left channel + 15W for right channel + 30W for subwoofer5. Adaptable power supply: DC9-24V, 7A (not connectable to AC)6. Speaker: left and right channel 10-30W, 4-8 ohms; subwoofer 10-30W, 4-8 ohms7. Protection mechanism: over temperature, over current, short circuit, anti-static protection8. Feature function: support Wuzhi Audio APP, modify Bluetooth name, password setting, beep volume adjustment, on/off beep, sleep aid song, firmware upgrade, etc. Pair box function, true wireless function allows two sets of speakers to be combined into a left and right channel pair box, with a stronger sense of spatial positioning9. U-disk support for more HD lossless formatsBluetooth decoding chip, better resolution, support remote firmware update, support TWS function10. Separate volume adjustment for subwoofer and stereo output11. Total volume is mechanical potentiometer, volume position is clear at a glance, multi-button function is abundant12. Dimensions: 75x70x20cm13. Weight: 77gZK-LT23:1. Bluetooth version: 5.12. Bluetooth transmission distance: 10m3. Audio input: Bluetooth + AUX + U disk + USB sound card4. Audio output: 50W for left channel + 50W for right channel + 100W for subwoofer5. Adaptable power supply: DC9-24V, 7A (not connectable to AC)6. Speaker: left and right channel 10-50W, 4-8 ohms; subwoofer 20-50W, 4-8 ohms7. Protection mechanism: over temperature, over current, short circuit, anti-static protection8. Feature function: support Wuzhi Audio APP, modify Bluetooth name, password setting, beep volume adjustment, on/off beep, sleep aid song, firmware upgrade, etc. Pair box function, true wireless function allows two sets of speakers to be combined into a left and right channel pair box, with a stronger sense of spatial positioning9. U-disk support for more HD lossless formatsBluetooth decoding chip, better resolution, support remote firmware update, support TWS function10. Separate volume adjustment for subwoofer and stereo output11. Total volume is mechanical potentiometer, volume position is clear at a glance, multi-button function is rich12. Dimensions: 75x70x20cm13. Weight: 78gSpecification: Package Weight One Package Weight 0.13kgs / 0.28lb One Package Size 11cm * 11cm * 8cm / 4.33inch * 4.33inch * 3.15inch Qty per Carton 232 Carton Weight 30.00kgs / 66.14lb Carton Size 50cm * 50cm * 60cm / 19.69inch * 19.69inch * 23.62inch Loading Container 20GP: 177 cartons * 232 pcs = 41064 pcs40HQ: 412 cartons * 232 pcs = 95584 pcs

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About The Product1. LINEPAUDIO A967 Passive PreAmp Active Speak Volume Two-Channel Controller is small and compact, applicable to use with active speaker or PostAmp, supports full-balanced or single-ended signal I/O, equipped with a switch for easily switching I/O signal. 2. Infinitely picky about the sound quality, infinitely tolerant on music. Passive PreAmp Volume Controller makes the desktop simple. 3. Small size but great wisdom, LINEPAUDIO A967 is tiny but with a complete set of common interfaces, supports full-balanced audio signal regulation and single-ended audio signal regulation, and switches I/O signal. 4. Suitable for the decoder and speaker without volume regulation, with the balanced I/O, RCA I/O architecture and switch function enabled. Its PreAmp will not cause a loss of signal source. In general, the audio source signals out of the decoder reproduces the original signals. The large dynamic range will not cause a quality loss, but keep the original signal source intact. 5. The preferred choice of active speaker, more and more music fans are not satisfied with the sound quality performance of common multimedia speakers, but rather select professional active monitor speakers. But such speakers generally don't have a volume regulation knob, but have to use with PreAmp. Most active monitor headphones are used for the desktop near-field listening, but a common HiFi PreAmp is large and occupies a large area. Moreover, most are concerned about whether the timbre of PreAmp matches the speaker or not, whether the sound effect is ideal or not. 6. But from now on, LINEPAUDIO A967 Two-Channel Volume Controller perfectly addresses the above two concerns, LINEPAUDIO A967 is small and compact, the internal circuit architecture design will not cause a loss of sound quality, the internal power amplifier of active speaker is enough to drive the speaker, so that you can hear the most genuine timbre and quality of the speaker, free from the need of choosing a suitable PreAmp.Features1. Input/Output impedance: 10Kohms - 50Kohms. 2. Two-channel I/O switch, RCA and Balanced XRL I/O. 3. Input: RCA / Balanced XLR (switch). 4. Output: RCA / Balanced XLR (switch).Specification: General Model A967 Material Metal Size 145*65*43mm Weight 314g Package Weight One Package Weight 0.46kgs / 1.00lb One Package Size 20cm * 18cm * 5.5cm / 7.87inch * 7.09inch * 2.17inch Qty per Carton 20 Carton Weight 9.13kgs / 20.13lb Carton Size 42cm * 38cm * 30cm / 16.54inch * 14.96inch * 11.81inch Loading Container 20GP: 556 cartons * 20 pcs = 11120 pcs40HQ: 1292 cartons * 20 pcs = 25840 pcs

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Product Functions1. A977 passive preamp active speaker volume dual-channel controller is small in size and suitable for active speakers or preamp/post-amp, it supports full-balance or input and output of single-ended signal. The product has functions of independent L/R channel volume adjustment, 2 signals input and 2 signals output. It provides balanced XLR and unbalanced RCA connectors which are automatically converted to each other, with a selector switch facilitates the signal switch of input/output.2. Small size, big intelligence. The product is of small size, but has well-function connecters. It is suitable for decoders and speakers without volume adjustment. the product has the design of balanced input/output and RCA input/output architecture, with switching function. The operation of the product will not cause loss of signal source. Generally, the audio signal released from the decoder is the original sound source signal. Great dynamics will not cause loss of sound quality, retaining the complete original signal source. Specification1. Input/output impedance: 10KΩ - 50KΩ2. 2 in 2 out switchover, unbalanced RCA connector and balanced XRL connector for input/output3. Input: unbalanced RCA connector / balanced XLR connector (convert selection)4. Output: unbalanced RCA connector / balanced XLR connector (convert selection)5. Product net weight: 320g6. Product dimensions: length 145mm x width 65mm x height 43mmSpecification: Package Weight One Package Weight 0.48kgs / 1.05lb One Package Size 22cm * 18cm * 6cm / 8.66inch * 7.09inch * 2.36inch Qty per Carton 24 Carton Weight 10.00kgs / 22.05lb Carton Size 44cm * 36cm * 36cm / 17.32inch * 14.17inch * 14.17inch Loading Container 20GP: 467 cartons * 24 pcs = 11208 pcs40HQ: 1085 cartons * 24 pcs = 26040 pcs

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Product presentation:1. Support power is 200 watts: 1 and 2 power amplifiers with 1 pair of speaker selector switches, ideal for home theater sound systems, power of 200 watts per channel, suitable for 4–16-ohm impedance speakers, with a compact thin desktop design, compatible with any home theater setting.2. AMPC Amplifier Control: The two-channel speaker switcher controls the stereo connection between two amplifiers and a set of speakers, or the combination connection switch selection, input/output through the screw-type connector terminals, which accept 14AWG speaker wire.3. Independent audio control: With independent audio source channel volume control. The button design allows you to individually select each amplifier to customize your home listening experience, and the volume switch controls the volume adjustment of the output speakers.4. Simple installation: The enjoyment of quality audio performance requires connecting the left and right channel outputs of the amplifier to the left/right and 1/2 amplifier inputs with 1 on 2 speakers on a mini dual channel controller.5. Overload protection: Equipped with a front panel control switch consisting of volume control knob and amplifier switch.Provide high quality audio and overload safety protection circuits and long-term reliability.Product Parameter：1. 2 input 1 output amplifier speaker selector switcher2. Convenient audio control accommodates 2 amplifiers with 1 pair of speakers.3. Home theater stereo amplifier system support, independent audio source channel volume control4. Input/output: screw type connector terminal, compact desktop/desktop mini design5. Front panel button control center, the product needs no power supplyBuilt-in electronic overload protection circuit6. Power processing: 200 watts per audio/speaker channel7. Speaker selector type: 2 soundtracks8. Speaker cable support: 14 wire gauge (14 AWG)9. Support impedance: 4-16 ohms10. Frequency response: 20Hz-20kHz11. Net Weight: 1.06 kg12. Packed weight: 1.21 kg13. Product size: Length 160mm x Width103mm x Height 55mm14. Package size: Length 260mm x Width 185mm x Height 65mm15. Kit list: 2 input 1 output amplifier speaker switcher output with volume adjustment function x 1Specification: Package Weight One Package Weight 1.25kgs / 2.75lb One Package Size 26cm * 18.5cm * 6.5cm / 10.24inch * 7.28inch * 2.56inch Qty per Carton 24 Carton Weight 30.00kgs / 66.14lb Carton Size 76cm * 54cm * 19cm / 29.92inch * 21.26inch * 7.48inch Loading Container 20GP: 341 cartons * 24 pcs = 8184 pcs40HQ: 793 cartons * 24 pcs = 19032 pcs

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1. 12V power supply, power failure memory2. With bluetooth call and recording function, bluetooth version 5.03. Decode MP3, WMA, WAV, FLAC, APE lossless format music4. Read USB disk, support SD interface5. Support FM radio, frequency band (87.5MHZ-108.0MHZ)6. External audio input LINE IN 7. Support 10m distance infrared remote control operation8. Pushbuttons: six buttons for multi-directional control, REC / REPEAT / VOL- / AUTO / VOL+ / MODE9. Large remote control uses 2 x 7 batteries (not included), small remote control uses button batteries10. Dimensions: length 112 x width 62 mmKey operation details.1. REC: Press the REC button to start recording, press the REC button again to cancel the recording function and play the recording file; when recording than a storage device needs to be connected, e.g. U disk or TF card2. REPEAT: Press once for the single song loop function, then press again to cancel the single song loop and play in sequence3. FD-: switch to the previous folder, long press to fast back4. FD+: switch to the next folder, long press to fast forward5. AUTO button (play/pause): short press for play/pause in MP3; short press for play/pause in FM, long press for auto receive and save station; short press for play/pause in Bluetooth6. MODE button: switch between USB / SD card / FM / Audio input / Bluetooth function in sequenceSpecification: Package Weight One Package Weight 0.12kgs / 0.26lb One Package Size 14cm * 9cm * 6cm / 5.51inch * 3.54inch * 2.36inch Qty per Carton 262 Carton Weight 30.00kgs / 66.14lb Carton Size 50cm * 50cm * 60cm / 19.69inch * 19.69inch * 23.62inch Loading Container 20GP: 177 cartons * 262 pcs = 46374 pcs40HQ: 412 cartons * 262 pcs = 107944 pcs

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1. Using the rotary encoder used in high-end speakers, stepless tuning, smooth hand feel, one-key start and stop2. High-quality all-copper DC plug, long life3. 3.5mm audio output, connected to active power box4. Free large area heat sink5. Number of channels: left and right dual channel (stereo)6. Protection mechanism: power reverse connection protection, short circuit protection, self-recovery overheat protection7. Purpose: Bluetooth speaker amplifier motherboard8. Bluetooth version: 5.09. Adapter speaker: 20-300W 4 ohm 8 ohm10. Transmission distance: 15 meters (without blocking)11. Supply voltage: DC 5-26V12. Dimensions: 53x18x58mm13. Weight: about 70gSpecification: Package Weight One Package Weight 0.08kgs / 0.18lb One Package Size 8cm * 8cm * 4cm / 3.15inch * 3.15inch * 1.57inch Qty per Carton 336 Carton Weight 30.00kgs / 66.14lb Carton Size 55cm * 55cm * 27cm / 21.65inch * 21.65inch * 10.63inch Loading Container 20GP: 326 cartons * 336 pcs = 109536 pcs40HQ: 757 cartons * 336 pcs = 254352 pcs

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About the product1. A high-performance portable mini size front-end signal amplifying switcher and sound quality processor, 2. Built-in high-performance power processor and signal amplifier 3. For circuit design, Texas Instruments(TI) NE5532 dual operation amplifying chip in top quality acts as the front-end amplifier. 4. NE5532P is tailored for the high-performance audio system, which features ultralow harmonic distortion, low noise, high gain bandwidth or other. 5. Dual FET input widens the dynamic range for NE5532, and sound signal amplification and bipolar operational amplifier. 6. NE5532 audio enhancement technology can correct and recover any signal loss and phase deviation of audio signal system for any reason, reproducing sound and indulging the audiences in the spot effects of enhanced high-low sound, somewhat ideal positioning, definition and brightness. 7. With the audio enhancement circuit, audio system will brighten sound, bring you closer to depth, slenderness and definition, fine treble, penetrating middle and strong and natural bass, placing the audiences on spot. 8. Sound signal amplifying switcher, mainly used to switch various multi-channel signal inputs, such as computer, cellphone, tablet, game console, TV set, TV box, MP3. 9. Additionally with output equipment of signal source or other signal inputs, used for amplifying switch 10. The front-end output adopts 3.5mm interface, the back-end output adopts RCA interface. 11. 11. Simultaneous output of balance circuit architecture is enabled in front-end and back-end, output can be connected to the headphone, stereo, amplifier or any other equipment, used as sound signal amplifying switcher for four-channel signal input and two-channel signal output. 12. With a wide range of application, readily used in any signal input equipment, or used as the front-end signal amplifier, power supply adopts bleeding technology, uses the high-precision potentiometer for balance adjusting, and the positive and negative voltage balance is ultrahigh. 13. Additionally with the tailored high-capacity filter capacitor, ensuring the clean power supply.Main Features1. Four-channel switch circuit (3.5 headphone base and gilt RCA base) replaces input signal with no need to unplug, just turn the panel option switch. 2. High-precision power bleeder circuit ensures the stability of circuit and reduces DC shift of output. 3. Advanced input and output connecting base ensures the smoothness and durability of signal channel. 4. NE5532, well-tailored for the high-performance audio system in best signal amplification, acts as front-end amplification. 5. Original potentiometer made in Taiwan, with small sound loss, high balance, good hand feel and durability. 6. Aluminum alloy housing has a high density of wiredrawing in oxidation treatment, good-looking and noble with screen, but with no color-shading as paint spraying. 7. Standard input interface: 4 x 3.5mm (with four-channel signal input switch) 8. Standard output interface: 3.5mm headphone base and RCA red-white audio base (with simultaneous output)Package Contents- 1 x A926 Four-In Two-Out Signal Amplifying Switcher - 1 x 100-240V Power Adapter (DC12V, US Standard, 100cm power cord) - 4 x 3.5mm Audio Cable (Length: 100cm)Specification: General Input Impedance 10 kohm SNR 110dB Distortion <=0.003% Frequency Response 20Hz-30KHz Output Power 140mW x 4 Output Load Impedance 60 ohm Output Noise >=0.1mw Channel Separation >=65dB Signal Gain AVOL RL>=600 ohm Power Consumption 1000mW Size 10cm x 9.5cm x 3.2cm Weight 356g Package Weight One Package Weight 0.51kgs / 1.13lb One Package Size 20cm * 18cm * 5.5cm / 7.87inch * 7.09inch * 2.17inch Qty per Carton 20 Carton Weight 10.20kgs / 22.49lb Carton Size 53cm * 43cm * 30cm / 20.87inch * 16.93inch * 11.81inch Loading Container 20GP: 390 cartons * 20 pcs = 7800 pcs40HQ: 905 cartons * 20 pcs = 18100 pcs

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