ST-1B - Zapco Monoblock 300W RMS Class AB Amplifier. Signal to Noise Ratio > 97dB. You will be issued a Return Authorization Number. In order to maintain an inventory of 100%, Brand New, A-Stock, untouched products, all sales are final. We ask that you please be sure you are ordering the correct product.The item "ZAPCO ST-1B MONOBLOCK 300W RMS SUBWOOFER SPEAKERS CLASS AB BASS AMPLIFIER NEW" is in sale since Wednesday, February 21, 2018. This item is in the category "Consumer Electronics\Vehicle Electronics & GPS\Car Audio\Car Amplifiers". The seller is "woofersetc_outlet" and is located in Los Angeles, California. This item can be shipped worldwide.