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April 2007 Meeting
Date: Sunday, April 15, 2007
Time: 6:00 PM
Place: Boston University, Life Science & Engineering Bldg, 24 Cummington
St, 1st Floor Conference Room (room 203), Boston, MA 02215, (617) 271-6588
Featured Guests:
Keith Larson and Brian Smith, Smith & Larson Audio, www.woofertester.com
Topic: Lecture and demonstration of automated testing of speaker
drivers
What is the Woofer Tester (WT2)?, USB powered, Low power
precision impedance and phase meter, Constant current drive (0 to 3mA adjustable)
from -20Khz, Precision Thiele Small parameters, RLC meter, Cable tester,
Vented, sealed, bandpass and Passive Radiator box design/simulator, Air
core inductor designer... this is the 'Speaker Measurement Interface' from
MCM-Tenma
Speaker Tester (ST), USB powered, In air acoustic testing,
Swept sine and pulsed sine, MLS and Impulse modes, Time decay analysis,
Distortion analysis, Interactive Crossover Designer (ICD), Use SPICE circuit
defined crossovers to create bass/treble signal pairs to interactively analyze
a speaker before committing to a physical implementation. - Tweeter protection
circuit (a direct amp connect can lead to a disaster!), -Frequency/Phase
defined method
Woofer Tester Pro (WT-Pro), Combines WT2 and ST in one
box, *Additional* in box--high power Z/P test port (via external amplifier),
Analyze Thiele/Small parameters from nano-Watt to 200-Watt drive levels,
Reveal suspension, motor and other drive-level dependencies, Fast MLS and
Step mode Impedance and Phase (fast, but less acurate)
Demonstration(s), Speaker cabinet Design, Interactive
Crosssover Design, WT-Pro High Power Test-- Run speaker at high/low power,
collecting TS data
In addition to demonstrating the Woofer Tester product
line, Smith and Larson Audio will be awarding one Woofer Tester 2 (the WT2
is a USB based Thiele Small and RLC measurement system) as a door prize
at the BAS April 15th meeting. Information on the Woofer Tester 2, Speaker
Tester and Woofer Tester Pro can be found at www.woofertester.com
| Directions: At
Boston University, Cummington St is an east-west street just south of
Commonwealth Ave. It is one-way going west. Parking on both Commonwealth
Av and Cummington St. is free and available.
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.
From Commonwealth Ave going west, after
Kenmore Square, after the tracks come up out of the tunnel, turn left
onto Blandford (at a traffic light). Then turn right onto Cummington
St.
MBTA Green line - exit at Kenmore Square
or the next stop, Blandford St. & Commonwealth Av. Walk a short
distance and make a left turn onto Blandford St. and right onto Cummington
St.
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