ELECTRO-VOICE S-200 (01) PDF Document

The ELECTRO-VOICE S-200 Equalizer is a two-channel active device designed to be used with the Model S-200 Stage Speaker system as an option. With its application to the sound system, it allows the speakers to be switched into their equalized (step-down) mode of operation, thereby extending the low frequency response limit by almost one octave, from 90 Hz to 50 Hz. In addition, this mode provides four decibels of increased efficiency.

The ELECTRO-VOICE S-200 Equalizer should be connected between the mixer (or preamplifier) and the power amplifier of your sound system. Follow these steps:

1. Connect the output of the mixer to the input of the Equalizer.

2. Connect the output of the equalizer to the input of the power amplifier.

3. Use shielded cable for both of these connections.

4. Connect the line cord to a source of ac power, as indicated by the red LED on the front panel.

Standard 1/4-inch phone jacks are provided for input and output connections. Since the power drain is less than 2 1/2 watts, the equalizer may be left energized between uses, if desired.

The ELECTRO-VOICE S-200 is essentially flat above 1000 Hz. Unlike some competitive systems which provide up to 18 dB of electrical boost at high frequencies, this substantially reduces the amount of high frequency energy which must be provided by the power amplifier.

Additionally, a sharp cutoff filter operating below 50 Hz attenuates sub-sonic signals and noise that lie below the useful response range of the speakers. Not only are these energy-robbing signals eliminated from the power amplifiers, but speaker cone excursion can be significantly reduced.

Yes. The equalizer is designed to drive two high impedance, unbalanced loads, as provided by typical power amplifiers. Up to five such amplifiers may be driven in parallel without appreciable degradation of specifications, and up to ten, with only a reduction in output level (headroom).

The equalizer can deliver over 8 volts RMS output into a high impedance load, which is much greater than that required to drive most power amplifiers to full output. A number of amplifiers may be driven in parallel, so long as their combined impedance does not fall appreciably below 1000 ohms. The latest Bi-FET operational amplifier circuitry is employed to assure very fast slew-rate capability, and clean sound.

Yes. An adapter panel is provided to allow the ELECTRO-VOICE S-200 equalizer to be mounted in a standard, 19-inch rack. The input and output circuit grounds are isolated from the chassis by an internal 10-ohm resistance to reduce the likelihood of generating a ground loop when mounted in an equipment rack.

Although it is unlikely that the equalizer could be overloaded at its input under any normal conditions, there is a maximum permissible input level versus frequency. At high and low frequency extremes, this represents a substantially greater level than that of competitive units.

Although a line voltage within the specified range (see specifications) is required for full rated output, satisfactory performance will extend 15 percent below this range, with some sacrifice in output voltage capability. The inputs are very high impedance and protected against incidental dc leakage voltages up to 50 V.