Watch as Allyn from Sonic Electronix explains what to do when your subwoofers are all hooked up to your amp, but there is no sound coming out of them. He explains why a multimeter is so important to have for car audio installs. He also talks about other things that could be wrong with your system, such as the fuses, voice coils, your sub's impedance, and more. Buy a Multimeter Here: http://bit.ly/16H12YF - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Sonic Electronix always strives to be the premiere online shopping destination for car electronics and other consumer electronics. Our slogan is "The X-Factor When Shopping for Electronics" and it is our goal to be just that. We're here to help you find solutions and great prices without sacrificing service. Our Store: http://www.sonicelectronix.com/ Our Facebook: / sonicelectronix Our Twitter: / sonicelectronix Our Instagram: / sonicelectronix