Down with Stands? Quantifying the Allison Effect
The problem of sizable and highly audible frequency-response dips introduced into the upper-bass and lower-midrange response of a loudspeaker in a room by reflections from the nearest corner is much ignored and/or poorly understood by consumers and designers. Placing speakers on stands commonly aggravates matters. Measurements of an equalized-flat 6-inch loudspeaker variously positioned in two real rooms show the extent and severity of the problem and demonstrate effective, simple countermeasures. A free software spreadsheet program which analyzes and graphs the problem theoretically is also described and compared with the measurements in order to gauge its predictive value.
Click to purchase paper or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member and would like to subscribe to the E-Library then Join the AES!
This paper costs $20 for non-members, $5 for AES members and is free for E-Library subscribers.