Bryston Expands BIT Lineup of AC Power Isolation Devices

bryston-bit-lineup-0315Bryston has launched the new BIT (Bryston Isolation Transformer) models aimed at larger applications. The new 45- and 60-amp models feature a 220/240-volt input with a 120-volt output and are available with or without AVR technology (Automatic Voltage Regulation). In addition to these new models, all BIT products will now be available with standard rack-mount faceplates, making them ideally suited for larger residential and commercial installations.

Bryston says the BIT product lineup was developed to address the need for an AC power device that accomplished three key objectives: power line conditioning, isolation and non-MOV-based protection. Existing models include 5-, 15- and 20-amp versions, now available with either 17-inch standard faceplates or 19-inch rack-mount faceplates.

Bryston’s new BIT products are already shipping and range in list prices from $5,900-$8,900.

Here are all the details.

Sara Abrons

About Sara Abrons

Sara Abrons is editor-in-chief of rAVe [Publications] and a graduate of the School of Media and Journalism at the University of North Carolina at Chapel Hill. Reach her at sara@ravepubs.com or on Twitter @SaraAbrons.

  • Bill Whitlock

    First, let me say that Bryston designs some of the finest products in the audio industry … and that comes from someone who’s spent 40 years doing analog circuit design in the pro-audio industry. However, as a recognized grounding and interfacing expert, it saddens me a bit to see Bryston getting into the “power conditioning” area that so riddled with misinformation. Anyway, let me address the claims, starting with “isolation”. The source of 99% of “noise” issues is small voltage differences that exist between the ground pins on AC outlets (that’s why the extremely dangerous and illegal practice of “lifting” these connections is so popular – even endorsed by those who should know better). Although it contains a transformer, it doesn’t provide any truly useful “isolation” (see footnote) and here’s why: To Bryston’s credit, the ground of output outlets is connected to ground of the incoming AC power … this is required by electrical code (NEC in the US) for any plug-and-cord connected unit. So the unit cannot provide “isolation” from the major source of “noise on the power line” in real-world applications. This means that even the Faraday shielding (usually touted to increase isolation) of the transformer will do little, if anything, in actual system applications. What DOES help immensely in reducing this noise is powering all system gear from the closely spaced group of output outlets on the unit … but you can do this with an ordinary outlet strip. The surge protection in the unit is unusual in a good way, since it will not endanger system equipment the way ordinary “3-mode” surge protectors do (this issue is difficult to explain briefly, but suffice it to say that the best protection of all is installed right at the main breaker panel). *FOOTNOTE: Electrical code does allow disconnection between input and output grounds, but this is called a “separately-derived system” and must be permanently hard-wired into premises wiring. This technique, which eliminates the noise induced in ground wiring along the AC power’s path from main breaker panel to equipment and re-establishes a local “mecca” ground reference point, is helpful and widely used in professional systems. – Bill Whitlock, AES Life Fellow and former owner/chief engineer of Jensen Transformers (now Whitlock Consulting with website under construction at http://www.billwhitlock.com)