IE-45 SPL Monitor

The Sound Pressure Level (SPL) Meter has all the features one would expect from a professional instrument. There are three elements in the SPL display. The small "SPL Window" in the lower right of the display shows current SPL to 0.1 dB. The analog bar display shows SPL in low (green), high (yellow), and very high (red) at user defined levels. And the large digital display shows SPL at a size that is easily seen from far away. Also shown is the currently selected weighting/filtering and the selected broadband detector.


(Meets ANSI S1.4‑1983 Type II with standard Ivie mic; Type I with optional Ivie mic (1134) and preamp (IE‑2P).


It is customary for the broadband detector of an instrument like the IE‑45 to allow the application of weighting filters such as Flat or “Z” (no weighting), A or C. In addition to the traditional weightings, the user can also choose to apply certain band pass filters to the broad band detector. The IE‑45 supports six octave band pass filters: 125Hz, 250Hz, 500Hz, 1 kHz, 2 kHz, and 4 kHz. Selection of the octave filters is very useful in sound system dispersion (horn aiming) adjustments and for intelligibility considerations in sound system coverage.

Detector Selection

The user can also select from several different broad band detectors in the SPL Meter. Fast, Slow, Peak, and Impulse are available. Meets requirements of ANSI @1.4‑1971 Type S1A, S1C; BS 4197‑1967; DIN 45633 B1.1, B1.2 (Impulse); IEC 651‑1979.

SPL Warning Levels

A number of SPL monitoring applications require knowing when a certain level is exceeded. The IE‑45 SPL Monitor has provisions for two user adjustable setpoints which can be used as warning levels. The user can set two SPL points from a pop‑up menu. When SPL exceeds the first point, the vertical bars above that point to the left of the display, as well as the disply itself, change to yellow. When the second point is exceeded, the vertical bars above that point and the digital display change to red, serving as a warning that the setpoint SPL’s have been exceeded.