Technical reports
Whether debunking or verifying new and long-held theories, the following reports promote a higher degree of understanding and awareness of the business of sound reproduction.
The LEOPARD Project (October 2015)
We developed the LEO family of speakers to produce the most ideal linear speakers possible: that is, to reduce distortion to the theoretical limit. LEOPARD is a small line array element in the LEO family that wasn’t targeted to a specific market. Instead, we gave it to our engineers as a challenge to see how well it could be designed.
Frequency Response Measurements and the Meyer Sound HD‑1 High Definition Audio Monitor (April 2015)
In developing the HD‐1, Meyer Sound embarked upon extensive research to formulate methods for obtaining acoustical measurements that are accurate to within 0.25 dB of free field. This paper describes the predominant factors that must be considered in any attempt to reproduce those measurements, and presents comprehensive HD‐1 polar performance data in the form of frequency response plots.
Headroom Predictions Using B-Noise in MAPP XT (April 2015)
The equal energy per octave nature of pink noise makes it an accepted reference source to predict the SPL and headroom of a loudspeaker or loudspeaker array. Pink noise is also an excellent, albeit conservative, means of estimating the SPL a system would linearly reproduce when driven with other types of inputs that have broad spectral content.
Calibrating Cinema Sound Systems (June 2012)
Cinema sound systems have always had a target "calibrated" level, such that when a "reference" noise signal is fed into the system, the overall gain should be adjusted so that the measured SPL is calibrated to a reference SPL level. With the advent of digital audio now becoming the predominant means for cinema audio tracks to be delivered, there is a need to revisit and reconsider all of the implications and expectations that come along with it.
The Case for Widely Variable Acoustics (August 2010)
Active acoustics can be employed to provide a wide range of reverberation time change for multi-purpose facilities. This paper presents a survey of preferred acoustical ranges presented for speech, reproduced sound, reinforced music, and acoustic music genres. Examples of venues that utilize active acoustics to widen their performance palette will include a worship space, performing art center, and experimental music studio. Their acoustic performance will be compared with archetypal acoustic music venues. The potential for new types of performances that are enabled by active acoustics will be discussed.
The Design and Performance of the REM Ribbon Emulation Manifold Waveguide (February 2004)
On December 30, 2003, Meyer Sound was awarded a patent for the REM ribbon emulation manifold waveguide, an innovative design at the heart of Meyer Sound's line array and curvilinear array loudspeakers. The REM waveguide’s main advantages over other designs - lower distortion and tighter pattern control - are achieved due to its short length and exponentially increasing waveguide channels.
This research is a continuation of our exploration into the effects of the trapezoidal “cavity” (“Do Cavities Between Arrayed Loudspeakers Affect Frequency Response?”) created when trapezoidal (and rectangular) loudspeakers are splayed at large angles. We revisit those original experiments using improved computational tools and take a look at the cavity between MILO 120 high-power expanded coverage curvilinear array loudspeakers and the results of using the MILO 120-I insert to fill the void.
User-Defined Equalization Curves with the LD-3 Compensating Line Driver (2003)
Utilizing multiple-variable atmospheric loss equations and pre-calculated Meyer Sound MAPP Online stored values, the LD-3 compensating line driver deploys digitally-controlled analog filters that combine the wide dynamic range of advanced analog filters with the precise repeatability and computer connectivity of digital control, while exhibiting no latency.
Comparison of the Directional Point Source Model and BEM Model for Arrayed Loudspeakers (2003)
There are many approximations to the Acoustic wave equation which can be evaluated numerically which are more and less accurate at modeling different acoustical phenomena and which are more or less computationally expensive. This paper compares the Directional Point Source model and the Boundary Element Method (BEM) for modeling arrayed loudspeakers.
DSP Beam Steering with Modern Line Arrays (December 2002)
This technical report demonstrates the differences between physically steering loudspeakers and beam steering loudspeakers and identifies the main problems: the 11-octave wide range of human hearing, the near impossibility of steering the sound produced from specialty waveguides, and the unintuitive back lobes and the cone of sound.
Verification of MAPP Online's Accuracy (2002)
To verify the accuracy of Meyer Sound's MAPP Online, Meyer Sound research and development personnel used the program to model the frequency response of an M2D Compact Curvilinear Array loudspeaker system as measured from a specified physical position in a known concert hall. The staggering results are presented in this paper.