In small rooms, early reflections figure prominently in what is measured and heard in the room so this curve may provide insights into potential sound quality.įloor bounce: average of 20º, 30º, 40º downĬeiling bounce: average of 40º, 50º, 60º upįront wall bounce: average of 0º, ± 10º, ± 20º, ± 30º horizontal Sound Power Directivity Index (SPDI): In this standard the SPDI is defined as the difference between the listening window curve and the sound power curve.Įarly Reflections Directivity Index (EPDI): is defined as the difference between the listening window curve and the early reflections curve. It is the weighted rms average of all 70 measurements, with individual measurements weighted according to the portion of the spherical surface that they represent. Sound Power represents all of the sounds arriving at the listening position after any number of reflections from any direction. The Early Reflections curve is an estimate of all single-bounce, first-reflections, in a typical listening room.
This encompasses those listeners who sit within a typical home theater audience, as well as those who disregard the normal rules when listening alone. The Listening Window is a spatial average of the nine amplitude responses in the ☑0º vertical and ☓0º horizontal angular range. The On-axis Frequency Response (0°) is the universal starting point and in many situations it is a fair representation of the first sound to arrive at a listener’s ears. For more information, please see this link. Measurements are provided in a format in accordance with the Standard Method of Measurement for In-Home Loudspeakers (ANSI/CTA-2034-A R-2020). For a detailed explanation of how the NFS works and the science behind it, please watch the below discussion with designer Christian Bellmann:
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Utilizing a minimum of measurement points, a comprehensive data set is generated containing the loudspeaker’s high resolution, free field sound radiation in the near and far field. studio monitors, mobile devices) as well as far field applications (e.g. Directivity, sound power, SPL response and many more key figures are obtained for any kind of loudspeaker and audio system in near field applications (e.g. The radiated sound is determined in any desired distance and angle in the 3D space outside the scanning surface. The Near-Field-Scanner 3D (NFS) offers a fully automated acoustic measurement of direct sound radiated from the source under test. Manufacturer’s information can be found here.Īpproximate retail price for these is about $329/pair USD.ĬTA-2034 (SPINORAMA) and Accompanying DataĪll data collected using Klippel’s Near-Field Scanner. Moreso, this is information for those who prefer “just the facts” and prefer to have the data without the filler. The review on this website is a brief overview and summary of the objective performance of this speaker. If you would like to help in this regard please see the “support” section at the bottom of this review. I purchased these speakers myself to review with funds from Patreon/PayPal/Affiliate Link revenue.
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