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Steven R. Rochlin
 
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Default 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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