SSL S4EQ 4 Band Pre-Amp Equalizer with Subwoofer Control<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Front， rear and subwoofer outputs; Fader control; Subwoofer volume control</li><li>Subwoofer Frequency 30Hz to 250Hz variable Bass 40Hz Midbass 150Hz</li><li>Mid 1kHz High 20kHz THD: &lt;0.01%</li><li>Signal-to-noise ratio: &gt;90dB Gold-plated connectors.Dimensions (W x D x H): 7" X 5-3/8" x 1"Dual Color Illumination (Red and Green)</li><li>Frequency response:20 Hz to 20 kHz， ±1 dB</li><li>Front， rear and subwoofer outputs</li><li>THD: &lt;0.01%</li></ul></div><img src="http://ecx.images-amazon.com/images/I/3176NipGj6L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41ONRihkOwL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/413ObUKIG1L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31IX9d140BL.jpg" noproxy>