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BOSTON AUDIO SOCIETY
Date: Sunday, February
23, 2014, 6:00 PM
Place: Boston University, Life
Science & Engineering Bldg, 24 Cummington Mall,
1st Floor Conference Room: (Room 103), Boston, MA
02215
Topic/Activity: Recent Experiments
In Control Of Early Reflections and Reverberation
in Concert Halls
Presented by: David Griesinger
Early reflections and reverberation time are considered
to be the major determinants of concert hall acoustics.
Recent work by David indicates excessive early reflections
and reverberation can obscure the clarity of sound.
He has measured and tested remedies to these problems
in several auditoriums locally. Among them are Jordan
Hall at N.E.C, Sanders Theater at Harvard, and Pickering
Hall at the Longy School of Music. He has also been
working on models of inner ear operation and correlating
the concert hall measurement to the models.
About David:
David Griesinger is a physicist who works in the field
of sound and music. He developed one of the first
digital reverberation devices, became a principal
scientist at Lexicon, conducted research into the
perception and measurement of the acoustical properties
of concert halls and opera houses, and is the designer
of the LARES reverberation enhancement system. David
has investigated the neurology of the inner ear and
created models that emulate the ear’s amazing
ability to separate musical sources and speech in
noisy environments.
Refreshments will be available
at 5:30 PM.
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Directions: Note
that parking is no longer allowed in the
block in front of our meeting place (temp
parking for unloading/loading is OK).
There is a gap in the BU buildings on
Commonwealth Ave. so you can walk through
directly to the meeting location.
At Boston University,
Cummington Mall is an east-west street
just south of Commonwealth Ave. It is
one-way going west.
From Storrow Drive
going east, take the first BU exit. At
the stop sign turn right on Commonwealth
Ave (A left is not permitted). Bear left
and at the 3rd light take a u-turn, go
half a mile and turn right on Blandford
St. (at a traffic light) and turn right
on Cummington St. The entrance is on your
left, number 24.
From Commonwealth
Ave going west, after Kenmore Square,
after the tracks come up out of the tunnel,
there is a traffic light at Blandford.
You should turn left on Blandford, but
no left is permitted. Instead turn right
and make a U-turn. Continue on Blandford
and turn right on Cummington St. The entrance
is on your left, number 24.
MBTA Green line -
Exit at Kenmore Square or the next stop,
Blandford St. & Commonwealth Ave.
Walk a short distance and make a left
turn onto Blandford St. and right onto
Cummington St.
Parking tips
- Any parking space with a meter is fair
game (meters don't run on Sundays). Try
Commonwealth Ave, then Beacon St. and
Bay State Road
A further note about
Parking:
Parking in the vicinity
of Cummington Mall has become a big issue
for members since the Red Sox playoff
game. Many have not dared to venture anywhere
near Kenmore since that game. First: I
can guarantee there will not be any Red
Sox home games until mid-April. Second:
During the winter there has been ample
parking available on: Bay State Road (1
block north of Comm Ave), Silber Way (the
intersecting street between Bay State
Road and Cummington), and Comm Ave. The
area reasonably safe. For those who fear
their auto being vandalized there are
for-fee parking garages along Brookline
Ave; but the walk is much longer.
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| Below,
other meetings and notices which may be of interest
to BAS members |
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When collecting
and plotting "noisy" data it is often
useful to have Microsoft Excel plot a Trend
Line through it. If that data is to be
used for further work, it may be necessary to
have an X-Y table of the Trend Line. That is
not easy to get and this paper will show how
to do it.
Joseph DeMarinis
has a new article here: Extracting
Numerical Data from an Excel Trend Line
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Foster's
Test Bench !
by Alvin Foster ! Click
the logo: —> |
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The rapidly-becoming-famous
BAS Headphone Test Article is now available
in the BASS VOLUME 25, ISSUE 4,
on Page 17, available HERE
PDF 3mb |
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Visit our
PODCAST PAGE
for:
The LIVE video podcast of our meetings,
Archived video of past meetings (only one so far!),
and Audio Podcast interviews by Alvin Foster |
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There is a supplemental and further
explanation addendum paper to the E. Brad Meyer / David
Moran paper published in the September, 2007 issue of
the AES Journal. That page, which documents
the experimental protocol and audio systems/source material
is here:
www.bostonaudiosociety.org/explanation.htm
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| There is a Power
Point Presentation of the lecture given by Dr. Barry
Blesser at the March 2007 Meeting. The Meeting page
synopsis is HERE;
the Power Point Presentation (as a web page) is HERE |
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Some earlier BASS
issues, previously available only directly by mail,
are now available online, on the BAS SPEAKER page,
HERE
Show your appreciation
for the immense amount of dedicated work that went
into both the original writing, gathering, editing
and printing, PLUS the more recent scanning
and conversion to PDF format, by joining the Society,
HERE !
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A
L L O F F S I T E L I N K S O
P E N I N T O A N E W W
I N D O W
- AND FOR CONVENIENCE
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The Boston Audio Society needs individuals
who will write summaries of BAS meetings into *.pages, *.doc, or *.txt
files. We usually have audio recordings of the meetings. We pay for
your work. Ask about our bonus program for meeting-writers! Contact
David B. Hadaway (603-899-5121; dbsys2@att.biz).
For sale: Several CD storage racks,
some made by Bostonwood (www.BostonWood.com/cd.html):
Two four-shelf units (25.5"Hx17"Wx5.5"D); One four-shelf
unit (25.5"Hx24"Wx5.5"D); Two three-shelf units (19.5"Hx17"Wx6.5"D);
one home-made three-shelf unit (18"Hx14"Wx6"D). I have
attached a handle and chains to several units, making them convenient
open-top carriers. David J. Weinberg (Maryland; 301-593-3230).
Seeking a two-channel preamplifier
such as an Apt Holman, an early Hafler, or an early NAD. Must work properly.
Fred Ampel (FAmpel@KC.RR.com).
Seeking prereceord Advent cassettes,
especially Russell Sherman Beethoven and Liszt recordings, and Handel's
Messiah performed by the Handel & Haydn Society under Thomas Dunn.
David R. Moran (DRMoran@aol.com).
I am disposing of all my old copies of the
BAS Speaker, which go back to 1978, more or less complete. I am going
to recycle these with waste paper unless somebody wants them for free.
I'll even pay shipping. Doug Pomeroy Audio Restoration & Mastering
Services audiofixer@verizon.net
Discography of Test Records. I am
compiling a list of technical test records from all recording eras and
would like to exchange information in order to confirm, expand, correct
and add entries. Send me your list and/or other information about test
records and I will send you my discography, which has nearly 200 entries
to date. I am interested in commercially released records, as well as
discs intended primarily for in-house use by audio engineers, broadcasters
and for other special applications. I am generally excluding demonstration
discs of the "Super Stereo bouncing ping-pong ball" type unless
they include at least some tracks of a technical nature, such as frequency
response and tracking tests, etc. Nicholas Starin, Portland Oregon,
NTSTestDisc@Gmail.com.
Nashville AES Test CD. (www.AESNashville.org;
click the small round symbol where it says "Click here for more
info:" to download the four-page description and track list. Use
the link on the website under <Products> to send an email for
pricing and availability.) From the website: "Assembled 'by engineers,
for engineers' after a survey of the needs of a broad cross-section
of working audio pros, the disc features 71 tracks of test signals ranging
from level calibration tones, noise signals, third-octave tones, polarity
and digital meter calibration pulses, bandpassed noise and swept sinewaves.
Additional tracks include dry-recorded kick and snare drums, acoustic
guitar and piano along with spoken word and a cappella male and female
vocals. A data area on the disc features BPM charts, Excel-based calculators
and other bonus material. The CD booklet includes tutorial information
on using the test disc."
For sale: Three Denon DR-M34HR cassette
decks ($500srp) with three heads and live monitoring of the recording,
dual Dolby B/C and Dolby HX Pro circuitry. Handles normal, chrome and
metal-tape cassettes. Highly regarded in 1988. Gasparo Records used
them as duplicators. In good shape. Data at www.VintageCassette.com/denon/dr-m34hr.
$125 ea+shipping. Contact David B. Hadaway. dbsys2@att.biz.
For sale: Arcam Solo Movie 5.1 (www.Arcam.co.uk/products,solo,Movie-Systems,SoloMovie51.htm;
$4500srp) The manual is downloadable from the Arcam website. I do not
have original packaging. $1000+shipping, which will be calculated once
destination is determined. Funds transfer or cash only; no checks. Fred
Ampel (FAmpel@KC.RR.com).
For sale. Two Tannoy HPD 315 speakers,
made in the mid-1970s, woofers might need refoaming. Steven Weiner (SDWeiner@ATT.net;
818-865-0601; Thousand Oaks, CA) is asking $500+s/h. [I have seen a
photo; the cabinets and grill look to be close to mint condition. This
ad was placed at the request of member Randy Hoffner. DJW]
Seeking: Soundfield Mark IV microphone.
Jim Mastracco (James.Mastracco@Verizon.net).
Laserdiscs for sale by David J.
Weinberg (301-593-3230; WeinbergDJ@BostonAudioSociety.org)
Four have Dolby Digital 5.1 soundtrack. Nine have DTS5.1 soundtrack.
Make offer for all or selected items.
| TITLE |
CLV / CAV? |
ASPECT
RATIO |
| Video Essentials |
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| Apocalypse Now |
CLV |
2 |
| Apollo 13 |
CLV |
2.35 |
| Batman (Michael
Keaton) |
CLV |
1.78 |
| Blade Runner (Director's
Cut) |
CAV |
2.48 |
| Blown Away |
CLV/CAV |
2.35 |
| Crimson Tide |
CLV |
2.35 |
| Daylight |
CLV |
1.85 |
| Evita |
CLV |
2.35 |
| Forbidden Planet |
CAV |
2.35 |
| Golden Eye |
CLV/CAV |
2.35 |
| The Grifters |
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| Highlander (10th
Anniversary Director's Cut) |
CLV/CAV |
1.82 |
| The Hunt for Red
October |
CLV |
2.35 |
| In The Mouth Of
Madness |
CLV |
2.35 |
| Jurassic Park |
CLV |
1.85 |
| Jurassic Park |
CAV |
1.85 |
| Phenomenon |
CLV |
2.35 |
| Pocahontas |
CLV |
1.66 |
| Pretty Woman |
CLV |
1.85 |
| Raiders of the Lost
Ark |
CLV |
2.35 |
| Raiders of the Lost
Ark |
CAV |
1.33 |
| Star Wars: Episode
1 - A Phantom Menace |
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| Toy Story |
CLV |
1.78 |
| Who Framed Roger
Rabbit |
CLV |
1.75 |
Own a movie theater sound system! For sale,
top-of-the-line High Performance Stereo HPS-4000-XL screen speaker systems.
Three (left, center, right) HPS model 545-4 speaker systems (www.HPS4000.com/pages/fivefortyfive_.html)
and two HPS model 545-W subwoofer speaker systems (www.HPS4000.com/pages/545_w_.html).
All in perfect working order. The speakers are not light, but consist
of modules that can be lifted by two moderately strong men. Truck delivery
only, or come pick up. Make me an offer. David J. Weinberg (301-593-3230;
WeinbergDJ@BostonAudioSociety.org):
Most units come with user manuals (some also
with service manuals), remotes and cartons, as applicable. Make offer:
- ReplayTV 2020 with aftermarket larger
disk drive. Includes lifetime electronic program guide service.
- Faroudja VP400A video quadrupler. Upscales
NTSC video to 960 progressively scanned lines for a front or rear
CRT projector. Generates great image on my big screen. I don't need
it because I'm modifying my video system.
- Runco 980Ultra CRT projector (original
packing, user and service manuals).
- Vutec concave high-gain silvered screen.
8' wide, 16:9 aspect ratio, with wallmount brackets. Silvered surface
makes it appropriate for 3D projection, as the high gain overcomes
the substantial light loss caused by the various consumer 3D projection
technologies, and the curved shape can deliver a wide viewing angle
with little hotspotting.
- Lexicon DC1 surround processor, with all
options.
- Panasonic RP-91D DVD player with JVB Digital
regionfree mod.
- Sony DVP-NS755V SACD (multichannel and
stereo), DVD, etc., progressive-scan output. $250srp.
- Tektronix D11 rackmount single-beam storage
oscilloscope with 5A15N vertical amp and 5B10N time-base/amplifier.
- Tektronix 5111 rackmount single-beam storage
oscilloscope with two 5A18 vertical amps and 5B10N time-base/amplifier.
- Teac AN-180 external dual Dolby B processor.
Simultaneous stereo record and playback.
- Pioneer CT-F4242 cassette deck, in excellent
condition.
- Garrard RC88 turntable with Shure M3D cartridge,
in excellent condition.
- Sony XM-5046 car audio amp, 4x50W into
4 Ohms
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