• Professional Audio Tool – Precision AC impedance meter with 10Hz–20kHz range for accurate system diagnostics and tuning.
• Exclusive Auto-Lock Feature – Automatically detects impedance peaks and valleys for fast, reliable measurements.
• All-in-One Solution – Measure impedance, set crossovers, tune enclosures, and verify driver T/S parameters with one device.
• Versatile Testing – Works on speakers, RCA cables, wire runs, and passive crossover networks for complete system analysis.
• Smooth Frequency Control – Super smooth frequency knob with selectable Low, Mid, High ranges for fine adjustments.

SMD IM-SG+ Steve Meade Designs Impedance Meter / Signal Generator Plus

This Listing Includes:

• (1) SMD IM-SG+ Meter /SGP


• (1) Impedance test harness


• (1) Y-adapter


• (1) User Manual

The Steve Meade Designs IM-SG+ is a pro-grade tool engineered to simplify system diagnostics, tuning, and testing. Designed with D'Amore Engineering, it delivers reliable measurements for raw drivers, loaded enclosures, crossover networks, cables, and multi-speaker systems across the full audio frequency range.

Powered by a 9V battery for noise-free operation, the IM-SG+ avoids the interference issues found with wall or vehicle adapters. Its intuitive controls include a smooth rotary knob, easy-to-read display, and range button with multiple modes for precision. The IM-SG+ combines four analog blocks: a sine wave generator, a pink noise generator, an analog amplifier, and an instrumentation amplifier. Driven by a powerful digital microprocessor for unmatched accuracy.

Whether you’re testing speaker impedance, locating vehicle rattles, tuning a crossover, or analyzing enclosure performance, the IM-SG+ is a must-have for serious installers, competitors, and enthusiasts.

Features:

• Precision AC impedance meter with 10Hz - 20kHz range


• Stand-alone sine wave and pink noise generator


• Auto-lock for quick impedance peak/valley detection


• Min/Max impedance hold modes for advanced analysis


• Harness compensation for highly accurate T/S parameter testing


• Extended battery life with 9V battery operation


• Test raw drivers, enclosures, crossover networks, RCA cables, and speaker wire


• Find resonant frequencies in speakers, vehicles, or rooms for tuning and SPL optimization


• Detect rattles and vibration points with signal sweeps


• Safely determine the system impedance load to ensure amplifier stability

Specifications:

• Impedance Measurement Range 1 ohm - 100 ohms with 0.1ohms resolution


• Low Impedance Measurement Range 0.00 ohm- 0.99 ohms with 0.01 ohms resolution


• Operating Range of Battery for tool accuracy 6.4 Volts - 10.5 Volts


• Sine Wave Generation Frequency Range greater than 8Hz - 20kHz in two ranges


• Frequency Measurement Accuracy greater than 99.5%


• Impedance Measurement Accuracy greater than 99% from 0 ohms - 30 ohms greater than 96% from 30 ohms - 99 ohms


• Pink Noise Generation Flatness 20 Hz - 20 kHz +/- 2.0dB


• Sine Wave Generation Frequency Response 10 Hz - 15 kHz +/- 0.8dB 10 Hz - 20 kHz +/- 1.5dB


• Battery Voltage Low Warning 7.2 Volts


• Generator Output Voltage (unloaded) 725 mV RMS


• Output Impedance of Signal Generator 10 ohms

Dimensions:

• Length: 9"


• Width: 6"


• Height: 2"