The EP4000 delivers everything musicians need-excellent sound quality, road-worthy toughness and reliability, low-noise operation and incredible power. The EP4000 is perfect for medium-sized club gigs, mobile PA systems, church services or public spaces.
The simple front panel controls of the EP4000 gives you all of your sound’s vital signs at a glance. After flipping the MAIN switch, the POWER LED will light when the amp is ready for action. Both channels have independent gain dials as well as clip LEDs that indicate when the signal is distorted and you need to reduce the gain. There are also SIGNAL LEDs that light up when a signal is present at the input.
A panel of switches found on the back panel offers an array of cool options to apply to both channels of the EP4000. The Clip Limiter lets you get even more out of the amplifier without overdriving either it or your speaker system. Built-in circuitry automatically senses when the EP4000 is being overdriven into “clipping” and then momentarily reduces the input level to avoid clipping distortion. This all happens in a few thousandths of a second, so it’s an inaudible way of avoiding audible clipping distortion. Of course, you can turn the Limiter off if you’re feeling lucky.
Ultra-low frequency sounds (infrasonics) are caused by rickety stage vibrations, mic thumps and wind noise. While technically inaudible, they can cause a huge drain on amp power, potential damage to your speakers and a sludgy sound in the audible bass ranges. The EP4000 features a defeatable Low Cut Filter that chops off unwanted frequencies below 50Hz or 30Hz (depending on your PA system’s capabilities).
The same panel contains the switches that allow you to put the amp to work in either stereo or bridge (mono) mode. The EP4000 can be linked to additional power amps by switching into parallel mode.
There’s plenty of awesome features on the outside of the EP4000, but there’s also a team of cool components on the inside helping it work its magic. The EP4000 comes loaded with famously reliable Toshiba/Fairchild power transistors as well as a high-current toroidal transformer for ultra-high transient response and further reliability.
Independent DC and thermal overload protection on each channel automatically protects the amplifier and speakers from any show-stopping meltdowns. There’s no need for fuses, giving you one fewer potential mid-gig headache.
The EP4000 has both XLR and ¼" TRS inputs. Even the outputs are totally flexible, consisting of Speakon-compatible outputs and five-way binding posts (AKA "banana jacks").
The exhaust fan, visible on the back panel, is the final stage of an internal front-to-back cooling system that keeps these amps working in the mild temperatures they love, even through periods of extended use. Finally, an impact-resistant, all-steel 2U rackmount chassis helps the amp stand up to all the rigors of the road.
It takes huge pulses of energy (current and voltage) to propel a woofer cone out fast enough to match a bass beat. That’s called Transient Response and it’s the holy grail of amp designers. By carefully selecting transistors with extremely high slew rates and optimizing other proprietary parts of the circuitry, the EP4000 is able to react instantly to ven the most demanding electronic bass impulses. If the woofers in your PA system can keep up, your audience will hear a tighter, crisper, more natural sound.