The world-renowned Classic Series Cabinets are synonymous with bass enclosures and the sound they are expected to produce. And because they know that players have different tastes, they make the configuration you are looking for. From the undeniable tone of the SVT-810E to the unexpected low end of the extended range SVT-410HLF, Ampeg enclosures have set the standard for decades. All enclosures feature dual Neutrik Speak-On(r) and 1/4 in. input/output jacks. Cabinets using high frequency horns contain a variable level attenuator. To prevent overpowering and damaging the horns, a resistive bulb is wired in series with the horn for protection.