Building on the reputation of the world-famous Peavey CS® 800, which conquered the power amp market in the 1970s, the CS® Series is the global standard bearer for workhorse reliability. Over the years, these amps have benefited from some of Peavey's most popular audio innovations, including our exclusive DDT™ compression/anti-clipping protection. With its 2 RU design and power points up to 4000 watts, this latest evolution of the CS® Series is leaner, louder and lighter than ever.
Distortion Detection Technique Limiting
Any time a channel is driven into hard, continuous clipping, the DDT circuit will automatically reduce the channel gain to a level just slightly into clipping, guarding the speakers against the damaging, high-power, continuous square waves that may be produced. Situations that may activate the DDT circuit include uncontrolled feedback, oscillations, an improper equipment setting or malfunction upstream from the amplifier. Normal program transients will not trigger DDT; only steady, excessive clipping will cause the DDT LED to illuminate.
LFC Impedance Sensing
CS Series amplifiers feature innovative circuitry for safe operation into any load. When an amplifier senses a load that overstresses the output stage, the Load Fault Correction circuit adjusts the channel gain to a safe level. Extreme load fault under high power levels will cause the speaker relay to disconnect the load for the associated channel. This method of output stage protection is far more effective than the standard limiting found on conventional power amplifiers. The LFC circuit is sonically transparent in normal use and unobtrusive when activated.
The internal fans will keep the amplifier operating well within its intended temperature range under all normal conditions. If a channel’s heat sink temperature reaches 85°C (which may indicate an obstructed air supply), that channel will independently protect itself by opening the speaker relay to disconnect the load until it has cooled. During this time, the PWR LED will go out and the cooling fans will continue operating at high speed.
If an output is shorted, the LFC and thermal circuits will automatically protect the amplifier. The LFC circuit senses the short circuit as an extremely stressful load condition and attenuates the signal, protecting the channel’s output transistors from over-current stress. If the short circuit remains, the channel may eventually thermally protect itself by opening the speaker relay thereby disconnecting the load.
DC Voltage Protection
If an amplifier channel detects DC voltage or subsonic frequencies at its output terminals, the speaker protection relay
for that channel will open, protecting the speakers.
Upon powering up, the amplifier mutes the input signals and stays in Protect mode with the speaker connect relays open for approximately four seconds. This allows the internal power supplies to charge and the amplifier to stabilize. After the relays engage, the signals slowly increase from muted to their normal level. Also, when power is removed, the input signals are muted so that no thumps or pops are heard.