Bosch EVF-1181S EVF-1181S-WHT User Manual

EVF-1121S, EVF-1151S, and EVF-2121S

12- and 15-Inch Low-Frequency Systems

EVF-1181S 18-Inch and EVF-2151D

Dual-15-Inch Subwoofers

These models are available to augment the low-frequency output 
ability of the EVF full-range systems. In their passive mode, the 
EVF-1121S and EVF-1151S have integral low-pass filters that 
roll off frequencies above 100 Hz at the rate of 12 dB per octave. 
This means that they can be used without an external digital 
signal processor (DSP) for crossover from the low-frequency 
to the full-range systems. As many as two full-range systems 
can be paralleled with an EVF low-frequency system on a single 
power-amplifier channel capable of driving a 2.1-ohm minimum 
impedance.

The two 12-inch woofers in the EVF-2121S provide additional 
sensitivity and twice the power capacity of the single-woofer 
EVF-1121S.  (Note that the EVF-2121S does not incorporate a 
low-pass filter.)

EV- Innovation

The EVF-1181S can be used with the full-range and low-
frequency systems to extend low-frequency output down to 35 Hz 
(3 dB down). The EVF-2151D has a higher output capability down 
to 40 Hz (3 dB down). (Note that neither system incorporates a 
low-pass filter.)