Portable Professional Audio Speaker Power Amplifier Ultra-wide Frequency Acoustic Testing System Impedance Tester

Introduction:
- Professional grade audio testing system, with an ultra wide effective measurement frequency of 0-40kHz, a maximum sampling rate of 192K, a signal-to-noise ratio of -120dB, and a dynamic range of 110dB. The whole machine adopts for TI chips, and the impedance passive components and interfaces are selected from domestic manufacturers, balancing performance and reliability. It is suitable for DIY speaker development, acoustic measurement, audio equipment debugging, and can also be used as a high-quality decoder.

Key Features:
- Ultra wideband acoustic measurement: effective measurement frequency of 0-40kHz, maximum sampling rate of 192K, signal-to-noise ratio of -120db, dynamic 110db. Frequency response measurement, sound pressure level factory calibration, built-in high-quality speaker amplifier, supports phantom power supply.
- Built in digital amplifier, high power and low noise: Built in digital amplifier, 0 noise output, PBLT output mode, output power up to 100W (requires a power supply that meets the power requirements).
- Independent signal link design: Independent ADC and DAC, paired with independent high-precision operational amplifiers, signal separation without interference. Impedance measurement adopts 2 ultra-low temperature drift high-precision resistors, differential sampling mode, providing precise and stable measurement.
- Three level power purification system: ultra-low ripple noise LDO power supply, suppresses power supply noise, and ensures measurement purity.
- Rich digital & analog output interfaces: fiber optic, coaxial digital signal output, can be directly connected to DSP, decoder, active speaker and other digital front-end devices; Stereo RCA analog audio output, can be used as a high-quality decoder, supports volume adjustment and frequency display.
- Support Chinese/English interface switch.
- Compact, portable, and driver free, compatible with various measurement software. Driver free design for full platform adaptation, for WINDOWS/MACOS system does not require driver installation and is compatible with mainstream measurement software such as REW and SMAART. It can be directly connected to a computer through the USB-TYPEC interface and start measurement in seconds.
- Complete hardware interfaces, covering all categories of electroacoustic measurements.

Specifications:
- Sampling rate: 44.1/48/176.4/192kHz (optional)
- Effective measuring frequency range: 0Hz-40kHz
- Sound card chip: CT7601
- ADC: independent ADC
- DAC: independent DAC
- Operational amplifier: 9pcs
- Microphone amplifier: high precision mic amplifier (OPAIN217)
- Control method: microcontroller control
- Display: yes
- Power amplifier measurement: available for all types of power amplifiers
- Acquisition method: differential acquisition
- Amplifier power: 100W
- Power supply: switch power supply
- Power filtering level: 3-level
- SNR: ≥100dB (typ. 120dB)
- Dynamic range: 120dB
- ASIO driving: support (Java exclusive driver free)
- Microphone sound pressure calibration: support
- Digital output: coaxial, optical fiber
- Analog output: RCA x stereo
- Local bottom noise: ≤-110dBFS
- Product size: 179 x 143 x 45.3mm

Applications:
- Car audio modification: in car frequency response testing, channel delay measurement, phase alignment check, THD distortion testing, in car background noise measurement, cabin T60 reverberation measurement, DSP debugging before and after comparison.
- Acoustic debugging of listening room: room frequency response testing, standing wave diagnosis, RT60/T60 reverberation measurement, environmental noise measurement, early reflection observation, speaker placement verification, comparison before and after sound absorption and diffusion treatment.
- Speaker unit DIY: TS parameter measurement, impedance curve measurement, unit frequency response measurement, comparison of box frequency response, verification of frequency division scheme, observation of box resonance.
- Electroacoustic research and development/sample testing: unit sample testing, frequency response comparison, impedance testing, distortion observation, box scheme verification, and multi batch sample screening.
- Teaching/Science Popularization/Demonstration: REW basic measurement demonstration, frequency response curve explanation, reverberation T60 teaching, noise measurement demonstration, speaker comparison test, live broadcast test demonstration.

Measuring Modes:
- Frequency response measurement mode: This mode uses an internal amplifier to drive the speaker. The internal right channel is looped. It can be used to measure frequency response curve, sound pressure level, distortion curve, waterfall plot, delay, etc.
- Impedance measurement mode: This mode uses an internal amplifier to drive the speaker, with a high-precision low-temperature drift sampling resistor inside. The resistance value is fixed at 6R, and this value is used to calibrate the impedance for the first use. The impedance measurement mode can measure TS parameters, speaker and frequency divider impedance curves, measure the impedance of speakers, determine volume and diving frequency.
- Output measurement mode: This mode does not use an internal amplifier to drive the speaker. The speaker is driven by external amplifiers/active speakers/car mounted DSP devices connected to RCA (Lotus Seat)/fiber optic/coaxial output, and then measured through a microphone. If only measuring DSP or front-end devices, you can unplug the microphone XLR plug and insert a 6.5mm plug to directly connect to the front-end, forming a loop.
- Amplifier measurement mode: This mode can measure the frequency response curve and distortion of analog/digital amplifiers. In this mode, the internal amplifier connection has been automatically disconnected, and the tested amplifier can be directly or through an attenuation network input to the local machine.
- Decoding playback mode: This mode can use the testing system as a high-quality decoder, with RCA/fiber/coaxial output. Supports up to 24BIT 192K.
- Sound card calibration mode: This mode can calibrate and create sound card measurement curves. This sound card has very high accuracy and can be calibrated free. The 20-30K curve can be measured in 96K mode.
- Impedance calibration mode: This calibration must be performed before using the impedance measurement mode. The internal resistance is 6 ohms. Follow the on-screen prompts to complete the three calibration processes. The last resistor can be any resistor, input the resistance value, and the device comes with a 10R resistor.

MID3000 Omnidirectional Testing Microphone:
- Directivity: full frequency
- Sensitivity: -32dB
- S/N: 74dB/1kHz
- Local bottom noise: 20dB
- Impedance: 1.6K ±30%/1kHz
- Frequency range: 20Hz - 20kHz
- Working voltage: 24V - 48V
- Working current: 1mA, max.
- Mic interface: 3-pin XLRM
- Size: 21 x 190mm
- Net weight: 166g

Package Included:
- 1 x Testing Main Unit
- 1 x MID3000 Testing Microphone
- 1 x Power Adapter
- 1 x USB Cable
- 1 x Alligator Clip Cable
- 1 x 10R Resistor
- 1 x XLR Cable
- 1 x Microphone Dustproof Bag