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Date: Sunday, January 25, 2015,
Place: Boston University, Life
Science & Engineering Bldg, 24 Cummington Mall,
1st Floor Conference Rm. 103, Boston, MA 02215
Guest: James W Lindenschmidt,
General Manager, RealTraps
Topic: Acoustic treatment for
your listening room
Our January guest will demo and
talk about treating your HiFi listening room. Their
slogan is Making the world sound better, one
room at a time. RealTraps, a leader in this
industry, suggest that the purpose of acoustic treatment
is to improve the quality of sound in a room. Common
problems are echoes and excess ambience, too much
or too little bass, poor stereo imaging and localization,
unclear movie dialog, and generally muddy sound. Low
frequencies are often the biggest problem, with response
variations as large as 35 dB, especially in smaller
To solve acoustic problems common
to all rooms, RealTraps has developed a line of very
high-performance acoustic treatment - bass traps,
broadband absorbers, and diffusers. Once a room has
been properly treated, the clarity and articulation
of music improves enormously. Whether you're a professional
recording engineer, serious audiophile, or home theater
owner who wants the best sound possible. According
to RealTraps, the most cost-effective way to upgrade
your entire system is with acoustic treatment.
RealTraps client lists include
recording studios, listening rooms, churches and chapels,
restaurants, bars, auditoriums, Foley studios, movie
sound stages, DVD mixing suites - even a research
lab at MIT!
All RealTraps products are built
in their own Connecticut factory by highly skilled
workers using only American made parts. Treatment
can costs anywhere from $600 to $15,000, depending
on the rooms problems/issues.
Refreshments will be available at 5:30 PM
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 directly through to the
At Boston University,
Cummington St. (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.(Mall) (at a traffic light) and turn
right on Cummington St. (Mall) The entrance
is on your left, number 24.
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 Mall and then a right
onto Cummington Mall.
Use your GPS (!)
Webmaster's note: Google maps and Apple
maps show them as Blandford Mall
and Cummington Mall. Bing maps
shows them as Blandford Street
and Cummington Street. YMMV.
1. Now there are services
to convert your mp3s to vinyl record.
Vinylrecorder, a German company, will sell you
the machine for $4000. [No reason you couldn't
convert your CD collection to LP too
2. BASS V36n3 has
been published. It features the Sep 2002 meeting
(!) Victor Campos, by John S. Allen, Sep 2011
Richard Burwen by Alvin Foster, Nov 2013 John
S. Allen: Recording and Editing Video by John
S. Allen, Dec 2013 Flea Market and Favorite
Recordings by David Hadaway. Also Custom Earmolds
by Nick Noiseux, The Darbee Doublet by David
Weinberg and Impressive Audio Quality in Les
Miserables by Kenneth Wacks. Also a personal
retrospective of Ray Dolby by Ioan Allen.
3. I am trying to
get the word out to your audiophile members
that our gold recordable audio discs are still
available. MAM-A has been providing 24kt. Gold
Recordable CD-Rs since 1996 under the MAM-A,
Mitsui and many other brands.They can be purchased
online at our web store or via other audio resellers.
Please contact me with any questions about MAM-A
or our discs.Thank you for your assistance.
Ira Apt, www.MAM-A-Store.com,
email me here
note: I am switching over to the MAM-A Gold
CD's for my Soundoctor Test CD
other meetings and notices which may be of interest
to BAS members
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.
has a new article here: Extracting
Numerical Data from an Excel Trend Line
Test Bench !
by Alvin Foster ! Click
the logo: >
BAS Headphone Test Article is now available
in the BASS VOLUME 25, ISSUE 4,
on Page 17, available HERE
The LIVE video podcast of our meetings,
Archived video of past meetings (only one so far!),
and Audio Podcast interviews by Alvin Foster
|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
|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
Some earlier BASS
issues, previously available only directly by mail,
are now available online, on the BAS SPEAKER page,
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,
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
There is a posting of an ABX article, The
Digital Challenge by Stanley P. Lipshitz HERE
( A new section! Watch for a full
page coming soon ! )
NOTE: offsite links open into a new page.
BAS Members may SELL items here; anyone may BUY.
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; firstname.lastname@example.org).
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
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,
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. email@example.com.
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
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.
||CLV / CAV?
|Blade Runner (Director's
Anniversary Director's Cut)
|The Hunt for Red
|In The Mouth Of
|Raiders of the Lost
|Raiders of the Lost
|Star Wars: Episode
1 - A Phantom Menace
|Who Framed Roger
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;
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
- Panasonic RP-91D DVD player with JVB Digital
- 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
- Garrard RC88 turntable with Shure M3D cartridge,
in excellent condition.
- Sony XM-5046 car audio amp, 4x50W into
again, for 2014, here's a very useful industry calendar of
audio/related events, with kudos to any and all who put this
list together: www.stiernberg.com/events.html