This paper presents techniques and examples for computing the peak current that a complex loudspeaker load can draw when driven by a signal with well-defined voltage limits. This peak current can be characterized by a nominal resistance Rn. The theory for Rn of Preis and Schroeter, valid for infinite bandwidth, is applied to finite-bandwidth impedance data acquired from an FFT analyzer. Some theoretically calculable loads and their respective Rn values are presented. Simple test data are analyzed which show that the impedance data must be real at the band edge. Complexities involved in the processing are discussed and illustrated for real loudspeaker impedance measurements, and phase tilting or use of the cyclic minimum-phase impedance is necessary to provide consistent results. It is not unusual for the nominal resistance Rn of a loudspeaker to be less than half the minimum impedance value.
https://www.aes.org/e-lib/browse.cfm?elib=5019
Click to purchase paper as a non-member 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 $33 for non-members and is free for AES members and E-Library subscribers.
Learn more about the AES E-Library
Start a discussion about this paper!