The pink noise level can be adjusted to appropriate levels for subwoofers, midrange cones and compression drivers and tweeters. There is also an XLR line output for feeding the pink noise to self-powered speaker units.
A DC OHMS TEST button applies 5 VDC to the output terminals selected with the pushbuttons for observing cone movement to identify speaker and cabling polarity errors. This also performs a DC Ohms test where three LEDs indicate approximate ranges of 4, 8, or 16 Ohms. This helps identify blown drivers in cabinets where the cones cannot be readily observed or in cabinets with multiple drivers in series parallel configurations.
The PRO-STP is powered by 4 AA non-rechargeable batteries or can be powered by an external rated 1Aat 6VDC power adaptor (not included).
About the test impedance
The DC Ohms Test measures the DC resistance of the voice coil circuit connected to the output terminals selected by one of the pushbuttons. This feature helps identify blown drivers in cabinets with multiple drivers in series parallel configurations.
Three LEDs indicate values of 4,8 or 16Ω:
• The green LED lights from 1.8 to 3.6Ω.
• The yellow LED lights from 3.6 to 7.2Ω.
• The red illuminates from 7.2 to 14.4Ω.
Pushing the switch applies a 5VDC voltage to the selected output terminals that can also be used for detecting cone speaker polarity and identifying speaker and cabling polarity errors. Current limiting on the output should protect compression drivers and tweeters, although caution should be exercised as with any battery test. Excess cable length may cause slightly higher readings.
