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Boston Audiuo Society Meeting
BOSTON AUDIO SOCIETY
October 2005 Meeting Date: Sunday, October 23, 2005 Time: 2:00 PM Place: Professional Audio Design, 357 Liberty Street, Rockland Mass Featured Guest: Dave Malekpour Topic: The October BAS meeting features a visit to Professional Audio Design (PAD), in Rockland Mass. PAD is best known for selling refurbished high end analog consoles, most notably the Solid State Logic line. But PAD is truly a full service company for the recording industry, offering Turnkey studio designs, from creating initial drawings, to supplying the gear to final installation and commissioning; over a hundred lines of new and vintage used equipment; a full line of monitors, nearfield to soffit-mounted studio configurations, including custom designs by Munro Associates; Parts and Cables; Furniture, Technical Service and Custom Electronics Designs. David Malekpour has graciously offered to have members of his sales and engineering staff on hand, to give us a tour of their thirteen thousand square foot facility. This will include discussions of consoles, sound equipment, studio designs, and the extensive technical design and rework shop. For more information about PAD, please visit their website at www.proaudiodesign.com ,and search for PAD on the MIX website www.mixonline.com This meeting promises to have something for everyone. Future Meetings President's Message for Oc 05 1. "Full Time iPod Use Causing Hearing Loss." The growing popularity of portable music players may be causing widespread hearing loss. "It's a different level of use than we've seen in the past," says Robert Novak, director of clinical education in audiology at Purdue University. "It's become more of a full-day listening experience, as opposed to just when you're jogging." Increasingly , Novak says he's seeing too many young people with "older ears on younger bodies"--a trend that's been building since the portable Walkman made its debut a few decades back. Hearing specialists says they're also seeing more people in their 30s and 40s--many of them among the first Walkman users--who suffer from more pronounced tinnitus, an internal ringing or other noise in the ears. Today, doctors say many people also are wearing headphones not just to enjoy music, but also to block out ambient noise on buses, trains or just the street. And all of it can contribute to hearing loss. [I wonder what acoustic levels these things can generate?--DBH] AP 13Oc05 2. "Oh Please Give Me a Sine" written by Andy Ciddor in TV Technology discusses the various light dimming systems used in theaters, and their deleterious effect on audio systems. Typically they operate by chopping the AC waveform into pieces, generating horrendous amounts of EMI (electromagnetic interference) which can corrupt the audio signals in the same theater. These sudden discontinuities cause mechanical vibrations that result in filaments singing along at 120 Hz. Most of the time this noise is barely noticed above the cacophony of air conditioning, hum from power supply inductors of various kinds, cooling fans, etc. Originally, theaters used salt water (smelly, toxic) or variable transformers (heavy, expensive) which were free from such problems. Now, in addition, the general adoption of switching power supplies causes large amounts of harmonic distortion in the AC line which can cause EMI in the audio lines. In the European Union, regulators decided during the early '90s it would be a good idea to reduce the conducted harmonics and voltage fluctuations generated by electronic equipment, and so wrote some new standards that were scheduled to come in to force toward the end of the decade. When it turned out that no one could actually build compliant equipment, the electronics industries of the EU quietly went about getting the deadline extended until 2001. That deadline too has passed, with very little activity on the other side of the Atlantic. However in a recording studio this has to be addressed. While the concept of an electronic sine wave dimmer has been around for many years, it was impractical to build them until recently. Now several companies such as ETC, Trusine, and Strand offer such units. Curiously, most of the marketing emphasis is on their acoustic silence rather than their negligible harmonic distortion added to the AC line or their almost total absence of EMI. 3Au05 AES Future Meetings www.bostonaes.org/ Acoustical Society of America Future Meetings www.gbcasa.org Directions: From Boston, Take rte 93 South, to rte 3 South. Take Exit #14, rte 228, onto Hingham St going towards Rockland. Follow Hingham Street for 2.3 miles to Webster St [rte 123]. Turn right onto Webster and go for .5 miles to Liberty Street. Turn left onto Liberty street. Pro Audio Design is .1 miles further, on the Left. The Boston Audio Society, POB 260211, Boston, MA 02126, Tel: (603) 899-5121 http://www.bostonaudiosociety.org, Enjoy the Music, Steven R. Rochlin http://www.EnjoyTheMusic.com Where you can find: Superior Audio, The Absolute Sound, Review Magazine, The $ensible Sound, Audiophile Audition, The Audiophile Voice... ....and MUCH more! |
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