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©1999 SLM Electronics, Inc. • A Division of St. Louis Music, Inc.
1400 Ferguson Avenue • St. Louis, MO 63133
47-056-01 • 05/99
LS1-131/LS2-215/LS3-231
Constant Q Graphic Equalizers
Technical Specifications
Due to ongoing product development and improvement, the specifications
contained herein are subject to change without notice.
Filters LS1-131: 1x31 Constant Q Multiple-feedback 1/3 octave ISO spacing from 20Hz to 20kHz
LS2-215: 2x15 Constant Q Multiple-feedback 1/3 octave ISO spacing from 20Hz to 20kHz
LS3-231: 2x31 Constant Q Multiple-feedback 1/3 octave ISO spacing from 25Hz to 16kHz
Center Frequencies, Hz (±3%) LS1-131/LS2-231: 20, 25, 31.5, 40, 50, 63, 80, 100, 125, 160, 200, 250, 315, 400, 500,
630, 800, 1k, 1.25k, 1.6k, 2k, 2.5k, 3.15k, 4k, 5k, 6.3k, 8k, 10k, 12.5k, 16k, 20k
LS2-215: 25, 40, 63, 100, 160, 250, 400, 630, 1k, 1.6k, 2.5k, 4k, 6.3k, 10k, 16k
Control Range ±6dB or ±12dB, switchable
Frequency Response 20Hz-20kHz ±0.5dB (flat settings)
Total Harmonic Distortion Less than 0.01% (20Hz-40kHz +10dBu)
Signal to Noise Ratio >94dB (20kHz noise bandwidth)
Gain (flat settings) LS1-131/LS2-231: ±12dB
LS3-231: -∞ to +12dB
Maximum Input Level +22dBm (Level control at center position)
Common Mode Rejection Ratio 50:1
Channel Separation 50dB (1kHz)
Low Cut Filter 10Hz-25Hz, 12dB/octave
High Cut Filter 3kHz-40kHz, 12dB/octave
Input Impedance 10k ohms
Output Impedance 2.2k ohms
Output Impedance 600 ohms
Bypass switch “Hardwire” Input to Output
Power Requirements 95-130VAC, 50/60Hz
190-250VAC, 50Hz
Input AC Power 12W
Size (HxWxD) LS1-131/LS2-215: 1.75” (4.5cm) x 19” (48.3cm) x 8.5” (21.6cm)
LS3-231: 3.50” (8.9 cm) x 19” (48.3cm) x 8.5” (21.6cm)
Weight LS1-131/LS2-215: 4.5 lbs (2.5kg)
LS3-231: 9 lbs (4.1kg)