I. Overview
In the field of electroacoustic measurement, we often need to measure the object under test (DUT), such as a loudspeaker, microphone, or smartphone, at specific spatial angles to accurately evaluate its spatial radiation characteristics and directivity . The MegaSig TT 627 is a professional-grade, high-precision, automated acoustic turntable. Through precise motor control, it can smoothly rotate the DUT 360 degrees, thereby automatically collecting acoustic frequency response data from various angles.
Compared to manual rotation, the TT 627 significantly eliminates human positioning errors and provides an efficient, low-noise, and highly repeatable automated testing solution through deep integration with testing software such as AudioExpert .
II. Core Functions and Technological Advantages
1. Extremely high-precision positioning and control:
The TT 627 offers resolution up to 0.1° and minimum step control. This allows it to capture frequency response differences of speakers or microphones with extremely high accuracy under minute angular variations, which is particularly crucial for the directivity analysis of high-frequency sound waves.
2. Diverse Operating Modes:
Through its built-in system, the TT 627 supports three flexible operating modes to adapt to different testing specifications:
- Finite mode: Based on the set acceleration/deceleration and rotation speed, it precisely rotates to the specified angle and stays there (delay can be set from 1 to 10,000 seconds), which is very suitable for stepped polar coordinate measurement.
- Continuous mode: rotates continuously at a fixed speed, suitable for dynamic capture when used with fast frequency sweep signals.
- Swing mode: Performs left and right sinusoidal oscillation tests at a specified frequency (0.01-1 Hz) and amplitude angle, suitable for verifying dynamic tracking algorithms.
3. Low noise floor design optimized for acoustics:
In anechoic chamber testing, the mechanical noise of the turntable itself can interfere with microphone pickup. The TT 627 achieves an ambient noise floor of 31 dBA, with the motor locked at only 39 dBA ; even under load (e.g., at 30 rpm), the noise level remains an excellent 45.2 dBA .
4. User-friendly automated communication and compatibility
- Dual interfaces: Equipped with an RS-232 (DB9) serial port and a LAN (RJ-45) network communication interface, facilitating the integration of cabling over long and short distances.
- High compatibility: In addition to supporting MegaSig’s proprietary communication protocol, it also has built-in support for the industry-standard ET250-3D communication protocol . This means that if your testing software was originally designed to control the Outline ET250-3D turntable, it can be seamlessly switched to control the TT 627, significantly reducing the cost of secondary software development.
- Touchscreen: The front panel of the chassis is equipped with a touchscreen, allowing engineers to directly perform manual forward/reverse rotation, homing, and parameter settings when setting up fixtures on site.
III. Usage Scenarios
Due to its high load-bearing capacity (up to 40 kg at the center ) and high precision, the TT 627 is widely used in the following acoustic engineering fields:
- Individual and array directivity testing (Polar Plot): Precisely measures the polar coordinate radiation pattern and beamforming performance of a single loudspeaker, miniature speaker, or microphone in 3D space.
- Verification of high-end consumer electronics products: Spatial performance evaluation of dual-microphone noise reduction (ENC, CVC) algorithms applied to smartphones or headphones .
- Smart speaker wake-up test: Place the smart speaker on a turntable and rotate it automatically at different angles to test the microphone array’s wake-up rate and voice recognition accuracy.
- Sound Power Measurement: By collecting sound pressure data from multiple angles, the total sound power output of the equipment can be calculated.
IV. Specifications
The following are the core engineering specifications of the TT 627 turntable:
- Rotation resolution / Minimum step size: 0.1°
- Maximum center load capacity: 40 kg
- Continuous torque / Peak torque: 4.2 Nm / 10.5 Nm
- Axial load capacity: 1100 N for compression / 360 N for tension
- Speed setting range: 1 to 300 rpm
- Disc diameter: 250 mm (M4 mounting hole at the top)
- Main unit dimensions: 150 mm (H) × 300 mm (W) × 340 mm (D)
- Main unit weight: 17.35 kg
- Operating voltage: 220V AC
V. Conclusion
The MegaSig TT 627 is a cost-effective turntable that combines precision mechanics with a modern communication interface. For acoustic R&D and testing teams, it provides a stable and quiet rotating platform, and its direct support for the ET250-3D protocol is a major boon for system integration. Whether you are building a brand-new automated anechoic chamber measurement system or upgrading an existing polar coordinate test station, the TT 627 helps you obtain reliable spatial acoustic data with maximum efficiency.