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Mipro ACT-727 System Review

Jan 5, 2010 12:00 PM, By John McJunkin

A mic system with high audio quality, simple operation, and an outstanding visual display.


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One minor issue that bears mention is the size and construction of the 7H transmitter. It is substantially larger in diameter than some other handheld mics on the market. It requires an especially large clip—and Mipro makes one. It wasn’t a deal-breaker for the vocalists with whom I tested it, but they would have preferred a somewhat smaller diameter. The bigger issue here is the surface of the handheld transmitter. It’s burnished metal, which increases the risk of dropping the mic, compared with the higher friction exhibited by a rubberized surface. Again, this is not a deal-breaker, but I’ve been known to raise this same concern with microphones from numerous manufacturers. It would not be a difficult fix, and any time the incidence of dropped mics can be reduced, it’s a good thing.

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The front and rear panels of the receiver are very straightforward and simple, with easily navigated controls featuring a clever data entry knob that is also a pushbutton. I had no difficulty dialing up group, channel, and frequency settings, not to mention the nicety of naming transmitters. The ACT-727 can be computer-controlled via Mipro’s proprietary networking protocol, and the parameters for setting this up are also adjusted from the front panel, as are the receiver’s squelch, and lock/unlock functions. Another standout feature of the ACT series receivers is the vacuum fluorescent display (VFD), which is a beautiful, high-contrast display that very clearly expresses information about the system in vivid colors, including the battery strength in the transmitter being received. I’ve never seen a better display from any other manufacturer. I examined the display under several lighting scenarios, and there were none that could render the display difficult to view.

In summary, I found the system to exhibit high audio quality, simple operation, and an outstanding visual display. There are micro-tweaks I’d like to see, such as the lack of a rubberized surface, but I would definitely use this system personally.


John McJunkin is the principal of Avalon Podcasting in Chandler, Ariz. He has consulted in the development of studios and installations and provides high-quality podcast production services.


Product Summary

  • Company: Mipro
    www.mipro.com.tw
  • Product: ACT-727 receiver and ACT-7T and ACT-7H transmitters
  • Pros: High-quality audio; exceptional visual display; simple operation.
  • Cons: Handheld has slippery burnished metal case.
  • Applications: Live sound wireless microphone applications.
  • Price: $700 (ACT-272); $350 (ACT-7H); $280 (ACT-7T)

Specifications

  • Frequency range: UHF 620MHz-934MHz
  • Bandwidth: 24MHz
  • Stability: ±0.005% (-10°C to 50°C)
  • Sensitivity: 6dBµV, at S/N >80dB, 40kHz deviation
  • Maximum deviation range: ±68kHz, with level limiting
  • Signal-to-noise ratio: >105dB(A-weighted)
  • Total harmonic distortion: <0.5% @ 1kHz
  • Frequency response: 50Hz to 18kHz ±3dB, with high-pass filter
  • Maximum output level: Unbalanced: +10dBV/0dBV/-6dB; Balanced: +16dBV/0dBV/-6dBV



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