Brand: MARKAVSI® Model: V1 Product Name: Interactive Teaching Public Address System Wall-Mounted

I. Introduction to Interactive Teaching Amplification System

This teaching public address system (suspended microphone PA system) solution employs a combination of amplification main unit (teaching integrated power amplifier) + suspended microphone + speakers. It offers advantages over traditional wearable teaching PA systems like the "Bumblebee": 1. Easy management, installed in a fixed location, no need for setup or cleanup before and after meetings; 2. 48V phantom power operation, eliminating the inconvenience of battery replacement and more environmentally friendly; 3. Long pickup distance, no need to hold a microphone, allowing for a relaxed and natural speaking experience; 4. One suspended microphone covers a wide range, eliminating the need to pass the microphone back and forth; 5. Saves investment costs; 6. Health and hygiene, no need to handle or touch.

Interactive Teaching Microphone Amplification System Overview

This product is a specialized equipment designed for school teaching amplification. It incorporates self-developed technologies such as adaptive feedback suppression, echo cancellation, and digital audio equalization to achieve long-distance microphone pickup. Simply install a pickup (our company's accompanying product) above the podium, and it can fully cover the entire area. Teachers can interact with students without wearing any amplification equipment, facilitating smooth classroom engagement. The pickup range is wide, and ambient noise in the student area does not affect the amplification quality. The sound is loud, solid, and not hollow, with no high or low-frequency distortion.

The system host provides a 48V phantom power supply, directly connected to the microphone. The accompanying microphone features a high-sensitivity, high-fidelity condenser microphone core, with a long pick-up distance and clear, natural voice. Equipped with an exceptional digital audio processor, it utilizes advanced AI ITAV chip high-speed floating-point algorithms to achieve adaptive feedback suppression, dynamic automatic noise reduction, active gain, echo suppression, and more. This enables long-distance microphone pick-up and remote interactive teaching. The amplification is sensitive, clear, noise-free, and evenly distributed in the sound field.

This system addresses the issues of traditional wireless microphones requiring frequent battery changes or charging and being prone to damage, facilitating device management.

Three: Components of the Hoisting麦(Acrylic) Amplification System Equipment

DSP-MK2000R Interactive Teaching Audio Amplification System Integrated Main Unit (Wall-Mounted) --- Front-end Audio Processing Amplifier, serving as the core equipment in teaching audio amplification systems or hanging microphone amplification systems.

1. Applicable Scenarios

Classroom (church) sound reinforcement, conference room sound reinforcement, training room sound reinforcement, elevator, catering, mine intercom, etc.

2. Product Features

This amplifier is a newly designed integrated amplifier, featuring feedback suppression technology and noise elimination algorithms, with a microphone pickup distance of up to 8-10 meters.

Install a suspended microphone above the podium, and it will fully cover the entire area with clear and natural sound.

This system focuses on solving the three major challenges of audio amplification stability, sensitivity, and clarity, ensuring high-quality audio amplification.

3. Feature Description

3.1 The algorithm utilizes powerful voice feedback and echo cancellation algorithms, as well as noise suppression algorithms, specifically designed for voice amplification.

3.2 Built-in adaptive dynamic noise filter, capable of filtering out background noise from the field environment. Noise suppression ratio reaches 18dB, improving sound quality.

3.3 AGC Automatic Gain Control: Maintains auditory comfort with automatic gain control from -12dB to +12dB.

3.4 Integrated AIITAV digital technology high-speed adaptive feedback suppression circuit (AFC)

3.5 Built-in Acoustic Echo Cancellation (AEC) circuitry, effectively eliminates echo for remote interactive teaching.

3.6 Built-in Smart Dynamic Noise Filter (AIITAV-ANC)

3.7 Active Noise Suppression (ANS)

3.8 Built-in digital high-pass, low-pass, and limiter; 6-band parametric (adjustable) digital equalizer: more precise frequency control.

3.9 Voice Enhancement Feature, improves clarity of speech.

3.10 Two microphone inputs, 48V phantom power.

3.11 Dual line input, dual recording level output, 2 x 130W power output (instantaneous power of 180W).

3.12 Auto-Protection, Auto-Gain, Dynamic Protection.

3.13 Microphone volume/music volume and machine parameter digital adjustment, with remote control via computer.

3.14 Keyboard Lock Function: After the administrator finishes debugging the device, lock the panel button to prevent unauthorized operations.

3.15 One-touch shuttle operation and LCD display subtitles for easy operation.

4. System Control Software

PC Software Diagram

Software Features:

4.1 Connect and control this host via USB serial port to the computer.

4.2 Set the high-pass and low-pass frequency values in the software interface.

4.3 Set the thresholds for noise gate and automatic level limiting.

4.4 Adjust the built-in 6-band (adjustable) equalizer frequency points.

4.5 Adjust the local microphone input volume.

4.6 Adjust the volume of the AUX input signal.

4.7 Adjust the volume of the AUX output signal.

5. Basic Parameters

1. Operating Voltage: 220V ± 10% (AC, 50/60Hz)

2. Microphone Input Level -40dB

3. Microphone Input Impedance: 2KΩ

4. Feedback Suppression Gain Enhancement > 15dB

5. Adaptive Background Noise Reduction >20dB

6. Microphone Frequency Response: 50Hz ~ 18KHz (-3dB, with band-pass off)

7. Line Frequency Characteristics: 20Hz ~ 20KHz (±2dB)

8. Distortion ≤ 0.1%, DSP Processor ≤ 0.065% (1KHz/0dB)

9. Automatic Gain Control -12dB ~ +12dB

11. Interface Microphone Polarized Power 48V (DC)

Line Input Level: 0dB, Two Channels

13. Line Output Level: 0dB, Two Channels

14. Rated Power Output: 130W + 130W (max. 180W x 2)

15. Volume (W x H x D): 278mm x 270mm x 50mm

Accessories: 1 national standard power cord, eco-friendly pearl cotton + paper box packaging

MK-903 Intelligent Teaching Amplification System with Microphone Technical Specifications

Broadcast sound quality, quick-install metal structure Cannon plug, low-noise circuit

Type: Pre-polarized Capacitive

Directionality: Supercardioid

Sound Capture Baffle: ≤100°

Frequency Response: 30-20,000 Hz

Sensitivity: -50dB ± 3dB (1dB = 1V/Pa at 1kHz)

Impedance: 600Ω

Maximum Sound Pressure Level: 132 dB SPL

Signal-to-Noise Ratio: >70 dB, 1 kHz at 1 Pa

Dynamic Range: 108 dB, 1 kHz at Max SPL

Imaginary Power Supply; 48VDC, 2mA

Dimensions: Length 240mm; Diameter 21.0mm

Connector; XLRM 3-pin male Cannon

SP680 Intelligent Teaching Amplification System Passive Bi-Waveguide Full-Range Voice Speaker

1. Overview of Passive Two-way Full-range Voice Loudspeakers for Educational Amplification

This series of speakers is specifically designed for educational public address systems, emphasizing high-fidelity sound transmission. The product is meticulously designed according to acoustic propagation principles, allowing two wall-mounted speakers to easily cover the entire classroom without any sound dead zones. It eliminates the issues of traditional low-cost educational speakers, such as limited transmission distance, low sensitivity, uneven sound pressure, and dead zones. The product utilizes a unique full-range speaker unit, ensuring extremely even frequency response and avoiding the drawbacks of low sensitivity, poor sound balance, and uneven sound quality that come with crossover units. Suitable for classrooms, conferences, multimedia amplification, and background music amplification, among other venues.

2. Product Features:

2.1 Utilizes a coaxial unit with prominent vocal expression and full-frequency sound, breaking through technical limits

2.2 Ultra-high sensitivity, easy to push, and with better transparency

2.3 Individual power of 80W, high-temperature resistant design, better suited for low-power audio amplifiers

2.4 The cabinet features a special斜面design, which reduces sound interference and minimizes feedback noise.

2.5 The box features a compact, high-impedance push-pull design, emphasizing clear language delivery.

2.6 The loudspeaker unit features an 8 ohm impedance design for easy parallel use.

2.7 High-temperature resistant voice coil design, enhanced durability

2.8 High-density wood speaker cabinets, 12mm thick, with water-based paint dots, offering a stronger and more reliable structure, as well as beauty and durability.

3. Technical Specifications

System Type: Passive 2-way Full Range Speaker

Frequency Response: 60Hz-18KHz (±3dB)

High-frequency Driver: 1×3" dome tweeter

Subwoofer Driver: 1×6.5"(165mm)/1.38"(35mm) Surround Sound Subwoofer

Nominal Impedance: 8 ohms

Sensitivity: 89 dB SPL

Rated Power: 80W (AES)

Maximum Sound Pressure Level: 111 dB SPL / 117 dB SPL peak

Connector: Compression Spring Terminal Red+, Black-

Case Size: 204×365×236mm (W×H×D)

Packaging Dimensions: 445×280×425mm

Net Weight: 4.9 kg/pc

Net Weight: 11KG/2PCS