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Summary of Contents for powersoft X Series
- Page 1 APPLICATION NOTES LIMITERS: BASIC CONCEPTS AND OPERATIONS...
- Page 2 The main purpose of this application note is to provide better understanding on how to use the different types of limiters available in Powersoft amplifiers. This document is applicable to the following product lines: X series, T series, Otto/Quattro/Due Canali DSP+D series, Mezzo series and Loto DSP.
- Page 3 2. Limiting, speaker damage and power compression The limiting process in sound reinforcement is a way to protect loudspeakers from accidental damage; therefore, limiters are a safeguard against excessive signal peaks and/or signal long term average power. Bear in mind that limiting does not only prevent occasional damage, but it first and foremost guarantees a long loudspeaker life.
- Page 4 3. Limiter type: RMS, Peak and Clip To avoid mechanical and temperature related damages two kinds of limiters can be used: • RMS limiter: Protects speakers against thermal damage when excessive power is applied for extended periods time, resulting overheating eventually burning.
- Page 5 Soft knee A soft knee slowly increases the compression ratio as the level increases, this way the changing from un-compressed to compressed sound is less audible. This value in Powersoft limiters is expressed in dB below the threshold. DO000274.00 REV.00...
- Page 6 Clip limiter The Powersoft clip limiter is a “brickwall” limiter that blocks the driving signal, not allowing it to exceed the threshold. This limiter has a fixed attack time of 0.3 ms with a lookahead of 0.3 ms that allows to anticipate peaks before they occur and therefore with the benefit of less distortion by not having a hard clip.
- Page 7 To calculate Voltage thresholds, attack, and release time for the three basic limiters available in ArmonìaPlus, Powersoft has developed a tool called the Power Sharing Tool. In this tool there is a dedicated section called “Suggested Limiters threshold” that can be used as a safety starting point while working with limiters.
- Page 8 7. Conclusions After this basic analysis of Powersoft limiters we can focus on two key points: the first one is that all Powersoft limiters are made to protect the loudspeaker, so it is best practice to have them always enabled.
- Page 9 Document Title: LIMITERS: BASIC CONCEPTS AND OPERATIONS Reference: DO000274.00 REV.00 Powersoft S.p.A Via E. Conti, 5 - Scandicci (Fi) 50018 - Italy TELEPHONE: +39 055 7350230 General Enquires: info@powersoft.it Sales: sales@powersoft.it Application & Technical Support: support.audio@powersoft.com Service & Maintenance: service@powersoft.it www.powersoft.com DO000274.00 REV.00...
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