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BOSTON AUDIO SOCIETY
Meeting notice for November, 2017
Date: Sunday November 5,
2017 at 1PM
Place: Symphony Hall, 301
Massachusetts Avenue, Boston Massachusetts
McCreath, WGBH / WCRB producer for BSO broadcasts
Oliart, WGBH / WCRB audio engineer for BSO broadcasts
Squire and Joel Watts, audio engineers for the
Topic: We have a great
opportunity to visit Symphony Hall and see its
audio broadcast and recording facilities. The
Boston Symphony Orchestra will be on tour in Japan
at that time, so the hall is unusually available
to us. We will have as hosts the members of the
team that is responsible for the BSO's radio broadcasts
and archival recordings.
The main mixing and monitoring
studio in the basement of Symphony Hall can accommodate
perhaps 10 or so guests at a time to look at the
setup and listen to music playback over the fine
B&W-based system. We will also use the Chorus
Room to meet as a group and hear from our BSO
and WGBH hosts, and small groups can be taken
to see and hear the studio. We can also bring
groups of guests up to the stage of Symphony Hall
to see the space, how microphones are hung and
placed, and how signals are transmitted to the
All BSO programs are recorded
on computer in multi-channel form, and archived
on hard drives. These recordings may be used for
commercial release on the BSO Classics label.
When Deutsche Grammophon or another record label
is capturing concerts for planned release, they
work in parallel with the WGBH/WCRB broadcast
Because of Symphony Hall security
requirements, we should provide the hall's security
team with a list of attendees in advance, so they
can be checked in at the stage door. If you're
not certain you can come, send your name in anyway
and say that you're unsure. This will also enable
us to get a rough idea of the number of people
who'll be there, so we can plan activities accordingly.
We should be able to accommodate
any reasonable number of people; logistics can
be adjusted as needed. Please check in at the
stage door (the St. Stephen Street end of Symphony
Hall) and proceed to the Chorus Room (signs will
be posted along the route).
***Note: You must pre-register
for this event. Reply HERE
to do so.****
Symphony Hall, 301 Massachusetts
of Boston: Take Route 93 South
to Storrow Drive to the Fenway exit.
Then take Boylston St. (inbound) to
Westland Avenue. Take a right onto
of Boston: Take Route 93 (the
Southeast Expressway) to the Massachusetts
Ave. exit. Approximately, seven lights
down on the left will be Symphony
From west of
Boston: Take Storrow Drive to
the Fenway exit. Then take Boylston
Street (inbound) to Westland Avenue.
Take a right onto Massachusetts Avenue.
Or, from the Mass Pike Extension,
take the Prudential Center/Copley
Square exit. Proceed down Huntington
Avenue, to Symphony Hall
Take the Heath Street/Brigham Circle
"E" Green Line train to
the Symphony stop. Or any other Green
Line train to the Hynes Convention
Center stop, then cross the street
to No. 1 bus or walk 10 minutes towards
south on Mass Ave., or the Orange
Line to the Massachusetts Ave. stop
go north on Mass Ave. to Symphony
Starting in Harvard Square, Cambridge
take the No. 1 Massachusetts Avenue
bus towards Dudley anywhere along
Massachusetts Avenue directly to Symphony
For further MBTA
and commuter rail information visit
Trip Planner page.
2017 New York AES Show (Oct 18-21) has its own page,
Also, there's a very useful list of exhibitors HERE
MICROPHONE CLINIC REPORT !
|In September 2009
the B A S held a microphone clinic, testing 37 different
microphone models. The ambitious nature of the clinic
effort, the extent of data collection, the number
of individuals involved in microphone testing and
in writing various sections of the report, and the
complexity in determining how to construct the clinic
report and make it available to members resulted
it not being published until now. The dataset is
Representative samples were
included in the abbreviated report in "The
B A S Speaker"
(Fall 2015; v37n3)
Go to the MICROPHONE
CLINIC PAGE for more...
1. A recent
ad for the Chord
DAVE D to A converter claims a noise
level of -180 dB. How is this possible?
(Theoretically a digital black signal of
all zeros would have zero noise). No electronic
circuit could be this low noise; there is
no way to measure it. The output impedance
is rated at .0055 ohm. This does translate
to a resistor (Johnson) noise of -180 dBV.
However it could only be achieved with an
undithered signal source , which would be
highly distorted. Any real musical signal
will have dither in the recording process
and will have a minimum noise close to their
signal to noise specification of -127.5
Also I am skeptical
since the electronics must add some noise
to the low output resistance achieved by
feedback. I would like to measure one.
email me here
Webmaster's note: I have distressingly noticed
that many companies are incorrectly
using the term "signal to noise".
Nominal operating level to the noise floor
is 'signal to noise'.
Nominal operating level to clipping is headroom.
Therefore the noise floor to clipping is
the 'dynamic range', not signal to
noise. Be wary of this.
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
our PODCAST PAGE
The LIVE video podcast of our meetings,
Archived video of past meetings (only one
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 is here:
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
BASS issues, previously available only
directly by mail, are now available online, on
the BAS SPEAKER page, HERE
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
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
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; email@example.com).
Does anyone have a schematic (or any other
info!) for any Dunlop-Clarke Dreadnaught amplifier? Email Barry
For sale: Audio Precision System
1 audio test system. SYS-322A, s/n SYS1-31968, IMD, BUR, W&F
options, A-weighting filter, PCI interface card, rackmounts; asking
$5000. Contact Mark Chambers 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 Services email@example.com
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
$125 ea+shipping. Contact David B. Hadaway. firstname.lastname@example.org.
For sale: Arcam Solo Movie 5.1
$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
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?
Anniversary Director's Cut)
|The Hunt for
|In The Mouth
|Raiders of the
|Raiders of the
|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
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
Most units come with user manuals (some
also with service manuals), remotes and cartons, as applicable.
- 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
- 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
- Garrard RC88 turntable with Shure M3D
cartridge, in excellent condition.
- Sony XM-5046 car audio amp, 4x50W into