Phil Graham is the senior engineering consultant of PASSBAND, llc (www.passbandllc.com). In recent times, computing power has enabled horn designers to be very innovative, bending the laws of physics for shortening (truncating) horns, and increasing horizontal dispersion (constant directivity), with limited success His work for KEF is currently focused on loudspeaker modelling, the development of software tools to aid loudspeaker design, and transducer design. blog comments powered by DISQUS back to top Newsroom Heil Sound designed the RC22 and RC35 capsules to fit onto most wireless transmitter “sticks” that have a threaded interconnect. 13 June, http://fallbrookpcusersgroup.org/compression-driver/piezo-tweeter-vs-compression-driver.html
The wave guide attempts to convert the circular throat opening of the driver to a vertical slot (line-source) at the throat of the horn. Ignorance and miss-understanding was and still is a problem throughout the professional audio industry. Details of a high-frequency compression driver are shown in Figure 1. Ultimately, if you raise the frequency high enough, all domes and ring diaphragms will exhibit modal behavior. https://en.wikipedia.org/wiki/Compression_driver
This also has to be compensated for by controlling power (peak limiting) to the driver. In this article we will focus primarily on drivers with dome diaphragms. Economic rationalism, not technical performance was and still is its downfall. Compression Driver Vs Piezo The suppression technique of Smith has been recently extended  using a more accurate analytical acoustical model of the compression driver geometry.
Multiple pages of mathematics or computer modeling work lead towards subtle tweaks in design that can yield impressive performance improvements. Compression Driver Horn Design The largest dome is 4in in diameter. This led to the selection of stiff (i.e., high elastic modulus) and lightweight dome materials. http://www.southampton.ac.uk/engineering/research/seminars/2015/11/17-wideband-compression-driver-design.page When too much power is dissipated by the driver, the circuit breaker interrupts the flow of electric current.
Overall the compromises and questionable improvement of horizontal dispersion of constant directivity horns do not match the original circular exponential horn acoustical principles. Compression Drivers For Sale There is a speed of sound in solid materials (i.e., the compression driver diaphragm) just as there is a speed of sound in air. Meeting the Horn Ultimately, the compression driver phase plug’s core purpose is reducing the open area the driver diaphragm radiates into and then gradually transitioning that smaller area to the horn If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website. × X Close Subjects X Close Lenard
Conclusion Even though they have existed since the dawn of compression drivers, phase plugs, and the diaphragms they support, always remain in the spotlight. The first class of phase plug is known as the radial phase plug, and is illustrated in Fig. 2. Compression Driver Vs Tweeter For a simple guideline, the modes of vibration in the compression driver only start to occur after a sufficient phase difference arises between the original and reflected wave. Compression Driver Vs Bullet Tweeter The Lens.
Any horn shape outside of circular will decrease efficiency and musical performance. check over here Additionally, errant reflections in the phase plug can bounce their way down the horn flare. The chief difference in output when cone loudspeakers are compared with horn loudspeakers is the relative efficiency of the system. DeleteCancelMake your likes visible on Facebook? Midrange Compression Driver
Horn Dispersion The on-axis response of horns can be flat but become directional as the frequency increases. Tips, tools and facts you need to prevent noise-induced hearing loss... All Rights Reserved Worldwide. his comment is here Presented at the 61st convention of the Audio Engineering Society.
Dr. Horn Driver Speaker There are tradeoffs to both designs, of course. Presented at the 123rd Convention of the Audio Engineering Society.
A reasonable question to ponder is why sound traveling through the dome quickly is desirable. Consoles Lighting Line Array Loud Speaker Microphone Mixer Networking Power Production Recording Rigging Signal Proc. The diaphragm movement is designed to be very very small and constant over frequency (constant exertion), unlike a cone speaker. Compression Driver Protection Understanding Compression Drivers: Phase Plugs by Phil Graham in Speaking of Speakers on 11 November, 2012 Print Email View Comments Over the past three issues of FOH, we have covered many
These various peaks and valleys are mathematically known as the “modes” of vibration in the diaphragm, and represent deviations from perfectly uniform diaphragm movement. The resistance of the bulb filament is proportional to its temperature which increases as current flow through the filament increases. An older circuit protection technique used by Electro-Voice, Community, UREI, Cerwin Vega and others is a light bulb placed in series with the driver to act as a variable resistor. http://fallbrookpcusersgroup.org/compression-driver/compression-driver-vs-bullet-tweeter.html The vertical slot causes the water or paint to be spread horizontally.
Let’s examine some of the principles behind the operation of phase plugs, beginning with the diaphragm inside the compression driver. Traditionally professional sound systems are not designed for fidelity. The muted, splashy, shrill, or honky compression drivers of days past continue to give way to impressively clear modern designs. Sound Reinforcement Staging Subwoofer Power Production Recording Rigging Signal Proc.
This work was largely ignored by his contemporaries and was only later popularized by Fancher Murray. Today the majority of compression drivers, either by inheritance or design, are based on the Against marketing and popular belief compression drivers do not successfully produce energy above 6k - 10k Hz.