Basically you can turn it to a specific frequency you want to maximize and then how wide you want it to be, if you want loud boomy 30hz, or tight narrow 35hz ... it also has a voltage meter and SPL meter, we've measured the SPL + voltage meter against a DMM, the voltage is right on, and the SPL is about 2 db's off from a TL, although it will vary with application and installation, depending if you dash mount it or whatever.
IN-DASH CAR BASS PROCESSOR WITH 160dB DISPLAY
FEATURES:
Para-Bass Equalization
Patented Bass Maximization Circuitry from The Epicenter
Chassis Mounted 160 dB Microphone and SPL Display
Peak Hold Capabilities
Speaker Level or Line Level Inputs
Balanced Differential Inputs and Outputs for Maximum Noise Rejection
High Headroom PWM Switching Power Supply
Switchable Backlight Illumination Color (Green or Amber)
Patented Bass maximization Circuitry
Includes 160 dB SPL Microphone and display
Peak Hold Display
Speaker Level Inputs
Selectable Backlight Colors
Maximum input level: 15 Vrms
Maximum output level: 135 Vpeak
Frequency response: 10Hz-100kHz;+/-1dB
Total harmonic distortion: 0003%
Signal to Noise ratio: - 130dB
Balanced input noise rejection: 60dB
Microphone acoustical level: 70 dB to 160 dB
High SPL Warning: 120 dB
Input Impedance: 10 Kohms
Output Impedance: 160 Ohms
Power supply: High headroom PWM
Power draw: 300mA
Recommended fuse rating: 1 Amp
Size: 6.75" W x 5" D x 1" H