Education Support

Amplifier Power Ratings & Other Mysteries Of The Universe Explained - Part 2

In last HUBs article entitled “Amplifier Power Ratings & Other Mysteries of the Universe Explained - Part 1” we examined the testing methodology and standards used to obtain and publish power output and mains draw ratings for audio power amplifiers. In this article we will delve further into amplifier power ratings with emphasis on the time duration used and attempt to explain the meaning of “burst” and “continuous” power ratings.

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Amplifier Power Ratings & Other Mysteries Of The Universe Explained - Part 1

Audio amplifier power ratings have long been a hot topic of debate amongst the professional audio community. Particularly controversial are amplifiers that on paper appear to produce more output power than they draw from the mains supply. This has prompted some sceptics to dispute published specifications based on claims that they defy the laws of physics. In this article I will attempt to explain the operation of such “physics defying” amplifiers and hopefully dispel some common myths in the process.

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Sound Systems For Emergency Warning Systems

Emergency Warning & Information Systems (EWIS) are very much a part of life these days. They are mandatory for most commercial buildings and public spaces and must comply with very specific standards. We regularly receive support calls asking if a particular product is “EWIS compliant”. This article attempts to explain the relevant standards and (hopefully) address some of the apparent confusion over this.

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Warning About Unlicensed HPL Lamps

Recently, an unlicensed, six-filament Chinese-made lamp has appeared in the U.S., marketed as a HPL source. One distributor is advertising this lamp under the name “Silver,” but other distributors may substitute the Chinese lamp for name-brand licensed lamps. Don’t get caught out with a dodgy HPL lamp…

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Standards Explained - Power Distribution Products

Jands manufactures a range of power distribution equipment that is safe and reliable. You can be sure of the safety of our equipment because all Jands power distribution products are designed, built & tested to the relevant Australian Standards. So what does that actually mean for the safety of our products – what is tested and why?

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Why Are There 40A Plugs On My Dimmers?

For some years now, Jands has included 40A 3-phase plugs on its dimmers instead of 32A units. Although we have been doing this for a number of years, we still get many calls from surprised customers who find the 40A plug on their dimmer no longer fits the 32A socket in their venue. So, why do we include 40A plugs?

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Dimmer Risetime

Since the introduction of Thyristor dimmers in the 70’s, dimmer risetime measurement has been used as a means to quantify the amount of noise and buzz that a dimmer will inject into an adjacent sound system. This article shows the standard measurement technique as used by Jands for measuring dimmer risetime and will help users understand how values from different manufacturers using different measurement techniques can be compared.

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Glossary Of Common Staging/Theatre Terms

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Why Do I Need A Wired Lighting Bar

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Not All Drapes Are Created Equal

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Sensitivity, Gain, Power, Volume - Different Words For The Same Thing?

Amplifier Gain

Lookout, its soap box time again! In the last issue of Production HUB I vented my frustration on the humble y-combiner lead. A harmless looking device, regularly found in the audio guy’s bag-of-tricks, yet capable of causing serious problems if used incorrectly. This month I wish to tackle a topic with far greater destructive potential: Amplifier gain!

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Getting The Lighting Right

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