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Category Archives: Power

Hum and buzz in audio systems and home theaters

What effect does ‘hum’ and ‘buzz’ have? ‘Hum’ and ‘buzz’ can cause major noise issues with our high performance audiovisual systems. Hum is a superposition of the 60Hz mains AC frequency on the audio or video signal. Buzz  is a superposition of the harmonics of the 60Hz (120Hz, 180Hz, etc) mains AC frequency on the […]

What is a dedicated line?

A dedicated line is an electrical circuit used solely for the purpose of supplying power to an audio or video system. No non-AV equipment should be connected to a dedicated line. The line runs back to the main service panel or a sub panel. A single high performance room may be fed by a number […]

What is whole room power conditioning?

Whole room power conditioning is a term we invented to refer to the use of a single conditioner to supply power to a number of dedicated electrical circuits feeding a single room.  The length of the dedicated circuits should be kept as short as possible to maximize the ability of the connected system to draw […]

What is a power regenerator?

Regenerators are conceptually very similar to online UPS systems except that there is no battery. They are basically amplifiers designed to output 120V at 60Hz . Done right, with a low distortion sine wave inverter, power regenerators offer protection for all power quality issues except interruptions and the high degree of isolation between input and […]

How should I choose a UPS?

The major considerations are: How much power does the UPS need to supply? In the event of a power outage the only devices you really need to keep on battery power are pieces of sensitive equipment such as projectors, computers and the like. To size the UPS add up the power consumption, in watts, of […]

Why should my projector be on a UPS?

CEDIAs (Custom Electronics Design & Installation Association) Home Theater Video Design bulletin (CEA/CEDIA-CEB23) states that: “an Uninterruptible Power Supply (UPS) is strongly recommended for proper shut down and cooling of the projector and lamp in the event of a power failure”. Without a UPS the projector lamp and electronics can overheat leading to failure and […]

Which devices should be on a UPS?

All devices with spinning hard drives – computers, music servers, home automation systems, etc should be on a UPS. Power outages can cause the hard drive head to ‘crash’ onto the platter and damage the disk. If you use a digital audio workstation (DAW), a UPS will allow you to save your work and shut […]

What is an uninterruptible power supply (UPS)?

A UPS is a device that provides battery power to connected electronics in the event of a power outage. There are three different types of UPS systems: standby, line interactive and online ‘dual conversion’. Pros: UPS systems are the only solution that can protect your projector  or hard drive equipped electronics in the event of […]

What is an isolation transformer?

Isolation transformers are oversized, specially designed versions of the transformers found in linear power supplies. They are called isolation transformers because there is no direct electrical connection through an isolation transformer (excepting safety ground). Incoming electrical energy is converted to magnetic energy and then back to electrical energy. Well designed isolation transformers have a large […]

What is a passive power conditioner?

A passive device is anything that doesn’t contain any powered electronic circuitry. Examples of passive devices include isolation transformers, surge protectors and resistor-inductor-capacitor (RLC) type conditioners. Power re-generators and UPS systems are active devices. Resistor-inductor-capacitor (RLC) devices represent the vast majority of ‘audiophile’ power conditioners on the market. The simplest devices forgo any resistors or […]