MEASURING SPEAKERS Demian Martin Product Design Service Burning - - PowerPoint PPT Presentation
MEASURING SPEAKERS Demian Martin Product Design Service Burning Amp Workshop 2019 AMPS AND SPEAKERS CANNOT EXIST WITHOUT EACH OTHER The traditional crossover is a dinosaur Commercial speaker systems are self contained with electronic
Demian Martin Product Design Service Burning Amp Workshop 2019
Demian Martin Product Design Service Burning Amp Workshop 2019
all matched to varying degrees.
Demian Martin Product Design Service Burning Amp Workshop 2019
esting components before the design phase
Demian Martin Product Design Service Burning Amp Workshop 2019
Demian Martin Product Design Service Burning Amp Workshop 2019
Demian Martin Product Design Service Burning Amp Workshop 2019
Demian Martin Product Design Service Burning Amp Workshop 2019
Demian Martin Product Design Service Burning Amp Workshop 2019
Even if you have the room its too small!
Demian Martin Product Design Service Burning Amp Workshop 2019
Concrete walls Suspected and isolated from the building and ground Fiberglass wedges that are 3’ long on all surfaces Expensive and special
Not really needed for speakers anymore.;
Demian Martin Product Design Service Burning Amp Workshop 2019
Typically 6 feet (2M) Floor must be hard and preferably rigid (concrete, hardwood, tile). 6 feet corrects for the acoustic gain from the reflecting surface
Demian Martin Product Design Service Burning Amp Workshop 2019
Reflections determine the low frequency limit for accuracy. The relationship to work with: Sound travels around 1 foot per
reciprocal of 1
first reflection will limit you to 100Hz.
Demian Martin Product Design Service Burning Amp Workshop 2019
Hard surfaces are better for this since determining the reflection is
blur the reflections by absorbing the high frequencies so the waves become harder to see.
Demian Martin Product Design Service Burning Amp Workshop 2019
Set up microphone and speaker around 1 meter apart in a room and hope for the best. Reflections will degrade the measurement. You can still sort out a number of aspects. Measure at different lengths so separate room, driver and cabinet diffreaction
Demian Martin Product Design Service Burning Amp Workshop 2019
Demian Martin Product Design Service Burning Amp Workshop 2019
Complete solutions needing only a PC with dedicated hardware for measuring speaker systems. More focus on manufacturing than R&D.
Demian Martin Product Design Service Burning Amp Workshop 2019
Software that works with soundcards and more standardized microphones
Demian Martin Product Design Service Burning Amp Workshop 2019
Demian Martin Product Design Service Burning Amp Workshop 2019
Demian Martin Product Design Service Burning Amp Workshop 2019
How the marketing department wants them to look B&K 4135 ¼” free field microphone $$$$$ Nady CM100 Measurement microphone $ Girardin microphone $?
Demian Martin Product Design Service Burning Amp Workshop 2019
Nady Bruel & Kjaer 4135 Girardin 1 dB per division and 2KHz to 50 KHz. The Nady can be “calibrated” to maybe 30 KHz with a correction file. Without you will probably boost the top end if you attempt to correct that far. Real measurements in “compromised” conditions of three microphones using a Pioneer ribbon tweeter. The B&K is very expensive. The Girardin is an ECM microphone capsule ($1) on the end of a 12” brass tube. The Nady is a used mike from
work if you know what to expect.
Demian Martin Product Design Service Burning Amp Workshop 2019
Even the best microphones cannot defy mother nature. On axis they will have a rising response compared to off axis starting at some frequency depending on dimensions. For a 1” mike the differences start at 1 KHz. ½” 2 KHz and ¼” 4 KHz. Know how your mike is calibrated.
Demian Martin Product Design Service Burning Amp Workshop 2019
There is a pressure buildup
normal the the acoustic wave. It peaks at 6 dB when the wavelength matches the diameter.
Demian Martin Product Design Service Burning Amp Workshop 2019
ON AXIS AND GRAZING (90°) RESPONSE NADY MICROPHONE
On Axis Grazing Note the difference with the grazing incidence dropping at an increasing rate. 2.5 dB
Demian Martin Product Design Service Burning Amp Workshop 2019
Demian Martin Product Design Service Burning Amp Workshop 2019
est at low level for Thiele/Small parameters
Demian Martin Product Design Service Burning Amp Workshop 2019
Demian Martin Product Design Service Burning Amp Workshop 2019
Demian Martin Product Design Service Burning Amp Workshop 2019
Direct Reflections
Demian Martin Product Design Service Burning Amp Workshop 2019
Demian Martin Product Design Service Burning Amp Workshop 2019
Phase transition
Demian Martin Product Design Service Burning Amp Workshop 2019
Phase transition
Demian Martin Product Design Service Burning Amp Workshop 2019
Initial Peak First reflection More junk
Demian Martin Product Design Service Burning Amp Workshop 2019
Initial response Decay
Demian Martin Product Design Service Burning Amp Workshop 2019
Demian Martin Product Design Service Burning Amp Workshop 2019
Demian Martin Product Design Service Burning Amp Workshop 2019
Demian Martin Product Design Service Burning Amp Workshop 2019
Demian Martin Product Design Service Burning Amp Workshop 2019
Demian Martin Product Design Service Burning Amp Workshop 2019
Demian Martin Product Design Service Burning Amp Workshop 2019
Demian Martin Product Design Service Burning Amp Workshop 2019
Demian Martin Product Design Service Burning Amp Workshop 2019
Demian Martin Product Design Service Burning Amp Workshop 2019
Demian Martin Product Design Service Burning Amp Workshop 2019
Demian Martin Product Design Service Burning Amp Workshop 2019