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SMWTMS was founded in April 1975 by four audiophiles. Our mailing list now covers over seventy people. Our interest in audio is at the highest levels, but our interest in organization is minimal. Meetings are announced in the club publication named, LC, The SMWTMS Network. This modest journal publishes member's thoughts on audio scene. The cost of printing and mailing LC is $14.00 per calendar year.
Our meetings occur on the second or third Saturday of odd numbered months and are held at a member's home. The typical number of people at a meeting is 20 ± 5. To reduce the burden on those able to host such a group, members who cannot host are placed on a co-host roster and asked to obtain the refreshments. There is a door charge of $5.00 at each meeting.
Since club journal and other costs are separate, meetings are open to all and out state members do not support local meetings.
Upon payment for LC, you will receive a list of current members. For inclusion in the list, please send your home and work phone numbers, and either your area of interest within audio or your e-mail address. To receive LC, please remit $14.00 to SMWTMS. Please make checks payable to David Carlstrom. Please indicate your willingness to host meetings in your home. Renewals are due in January of each year.
SMWTMS meeting programs are primarily prepared and presented by SMWTMS members. New members are encouraged to contribute a program as soon as they feel comfortable. Contact the Program Director with your ideas.
Current Project
The Linkwitz Challenge:
One goal of an audio system is the creation of an Auditory Scene that is close to that heard at the live performance. Sigfied Linkwitz claims this can be done with good speakers and a good set up and the Challenge is to learn what makes this illusion succeede or fail. Variables to be studied are the loudspeaker's position in the room, the room acoustics, the loudspeaker's directivity, and off-axis output.
David Clark's documents on the Challenge:
The Siegfried Challenge
Evaluation Form for Auditory Scene Reproduction
May 8, 2010 Presentation to SMWTMS
Sample Topics from Previous Meetings
Latest in Audio:
Reports from Audio Engineering Society Conventions, the Consumer Electronic Show, and other audio related events around the world by members of the Detroit delegation.
Annual Trunk Sale & Swap Meet:
Sell, Trade, or Auction your excess audio gear and spare parts from the trunk of your car. Astounding items and astounding prices have made the SMWTMS trunk sale popular. Sound & Vision offers leftover gear and SMWTMS accepts!
Live Music:
Guitar and Bass Session; Flute and Oboe Tutorial and Recording Session; Brass Quintet Recording Session; Violin; Vocal Recitals; String Quartet Recording Session; Viola; Classical Guitar; Jazz Singer; The Bob Foley Concert Tour, a guide to local and not so local concerts of merit.
Annual Autosound Contest:
Judged by Perceptual Transfer Function Measurements; Measuring Imaging Performance; Perceptual Transfer Function Spatial Rendition Module; The Tuner Box; "The Grand Wazoo" audio system concept in a Dodge Durango; Perceptual Transfer Function Microphone Array; Localized Sound Power Measurements; Foamy Head Measurements; Annual Autosound Contest; Subjective Test Form.
AB Listening Tests:
Auditory Scenes; Earl Geddes Speakers v. JBL and Gradient; PSACS 2001 Op Amp ABX Test Report; PCABX Tests; 24 bit / 96 kHz Sampling Digital Audio; ABX Testing After 23 Years; Studio Condenser Microphones; 5.1 Channel Dolby Digital from distant speakers compared to virtual 5.1 on two close-up speakers; MD encode/decode; Power Amps; Pre-Amps; Loudspeakers; Absolute Phase; Cassette vs. Open Reel; Piano Sound Comparison; AB Ethics; Subjective Test Form.
Speakers:
Monopole Subwoofers v. Infinite Baffle Subwoofers; Reference Surround System, "Single Box Surround Speakers" by Steve Eberbach, founder of DCM Loudspeakers; "Loudspeaker Design Basics & More" by Jesse Spence; Outdoor Speakers; Position Dependant Amplitude Modulation Distortion (POSDAM); The "Boxter" a tiny sub-woofer; Large Displacement Subwoofer Systems; Mark Ziemba exotic PA system; How To Make Ribbon Speakers; Backyard Horn Speaker System; Small Venue Sound Reinforcement Speaker System; Transmission Line Bass Reflex Hybrid; Optimum Placement of Sub-Woofers; How to Design an Award Winning Speaker System; Working With Wood; TEF Analysis of Loudspeakers; Speaker Recone Demo; Speaker Driver Parameter Measurements (Thiele/Small, Impedance, X-Max); X-Max Theory; Heil Tweeter as a Horn Driver; Speaker Construction Contests; Home Theater Sub-Woofer and Surrounds; Carver Amazing Speakers; DUMAX linearity analysis.
Demonstrations & Reports:
FM Tuner Reception Testing and the Sony XDR-F1HD AM / FM / HD radio tuner; Two Channel Expansion Formats for Surround Sound demo of 5.1 material and 2 channel material up-matrixed to Dolby PL-II, DTS, Logic 7, etc. for comparison to the original stereo.
Home Theater:
Alan Fassinger's Home Theater; Earl Geddes Home Theater; Vibration Transducers for Shaking Theater Seats; 3-D Audio or Personal Home Theater; Listening Room Design for "5.1 Channel" Audio.
Acoustics:
The Siegfried Linkwitz Challenge to the AES; De-reverberation and the Recording-Playback Process; Room Curves; 3-D Audio or Personal Home Theater; Listening Room Design for "5.1 Channel" Sound; IEC Listening Room Description and Visit.
Design Analyses:
Planar Magnetic Speakers; 24 bit / 96 kHz Sampling Digital Audio; Home Theater Formats; Compact Disc Manufacturing Technology; Ambience Systems; Digital Audio Principles; Digital Delay Lines; Digital Data Compression Demo; The Human Ear; 1963 AMI Juke Box; RCA 45 RPM System and 45-EY-2 Player.
Construction Projects:
Seat Shaker for Home Theater; 8mm Film Chain; Microphone Pre-Amp with Jensen Transformers; Electro-Voice 30"; Woofer with Motional Feedback; PORN (Pipe/hORN) Woofer; 16mm Movie Sound.
Software Analysis:
"Mixing Principles and Techniques"; "Jazz Organists", "Microphones and Microphone Techniques"; "Folk Rock 1965 - 1975"; "Teenage Dance Crazes of 1955 - 1968"; "Early Greenwich Village Folk Scene"; "Soulsville U.S.A.= Stax Records 1960-1975 in Memphis"; "Jazz Influences to Early Rock'n'Roll, 1945 - 1960", "Sultans of Synth", "New Romantic Movement", "Bob Seger Before Live Bullet" by David Hill; Tone Bursts for Acoustic Measurements; Truly Difficult Pop Music Quizzes from Dave Hill's research; Multi-Channel Surround Systems; Most and Deepest Bass on CDs and from Electric Bass by FFT Analysis; Mercury Living Presence Recordings; Recordings Made by Club Members.
Equipment Clinics:
Audio Test Reports on the Web; MD Players; CD Players; Pre-Amps; Power Amps; FM Tuners; Tape Recorders.
Trips:
Toronto Society; Group Recording Sessions; CES; Recording Studios.
Commercial Presentations:
Paul Barton, Founder and Chief Designer of PSB Speakers International;
Monsoon Multimedia Speakers;
Waveform Inc.;
Michigan Theater (Jackson);
The David Hafler Company;
The ABX Company;
Jensen's Stereo Shop;
Audio Concepts;
Newform Research.
Computers and Audio:
6.1 decoder PC card; Virtual Instrumentation; Computerized Measurements of Analog and Digital Audio Players and Recorders; Frequency Response Measurement and Evaluation Protocol; Introduction to the Internet; Home Computers and Audio
Video:
Basics of Color Monitor Calibration; A Technical Review of NTSC on the Eve of its Replacement with ATSC; Microphones for Video Camcorders; Woodward Avenue Cruise 1996 & 1997; Trunk Sale 1996; Autosound Contest 1986 & 1987
Stories from the Club Newsletter
LC, The SMWTMS Network.
November 1991, Commemorative, 100TH Issue of LC, The SMWTMS Network, is available separately: Contains historical stories of SMWTMS and the ABX Company; 57 Pages; Laser Printed; Plastic Tab/Ring Bound; $14.00 each, postpaid.
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