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manual abstract
In addition, the first two Input Channels can be used tor disc playback. Each of these two inputs has a switch-selectable fixed RIAA disc playback equalization circuit. All Input Channels have easy-to-handle sliding fader Volume Controls for riding gain. An LED Overload Indicator on each Input Channel gives visual warning of potentially distortion-producing conditions. Rotary Attenuator Controls (pads) for each Input Channel have an adjustment range of 40 dB, more than adequate to eliminate overload in any Input Channel Eight dual-section Equalizers are provided to enable the user to tailor the tonal characteristics of each input signal. These Equalizers have continuously variable rotary boost and cut controls in both the high frequency (treble] and low frequency [bass) sections with detents at the flat (no boost or cut] settings on both controls for easy, repeatable return to original "untouched" signal conditions. Special effects can be added to the output signals of the unit by means of either or both of the PA-250's effects systems. Each Input Channel has a combination On/Off-Effect Selector switch (Stand By Switch] that when activated can send a portion of the corresponding input signal to either the Echo Effect Buss (which requires an external echo device] or to the Reverb Effect Buss (which utilizes the PA-250 s built-m spring reverberation unit] The amount of any input signal that is sent to either Effect Buss is determined by individual Effect Controls on each Input Channel. The two Output Channels of the PA-250 can be used as a stereo pair, and left-to-right positioning of input signals can be achieved by means of the Panpot Controls for each Input Channel. In addition to the eight primary inputs (and Phono Inputs], the PA-250 features a dual-channel line level Auxiliary Input, with a dual section volume control. Direct input access to the Left and Right Mixing Busses is also provided (MIXING BUSS IN L & R jacks] so that the line level outputs of another mixer (Roland PA-150, PA-80, KM Series] can be combined in the PA-250 output signals. Line level outputs from the PA-250 (MASTER OUT and MONITOR OUT jacks] are available for connection to the MIXING BUSS IN jacks of another mixer, external power amplification (Roland SPA-120. SPA-240], or other audio equipment. For 2-channel recording during live performances, the PA-250 REC OUT jacks supply line level signals that are derived directly from the Mixing busses, and are not processed through the Graphic Equalizers. Stereo Headphone monitoring is available at a Front Panel HEADPHONE jack, with a volume control that is independent of the Master Volume Controls. Although the PA-250 was designed primarily for sound reinforcement/stage monitor applications, this versatile unit will perform a variety of audio control functions. For examples of different uses for the PA-250, consult the Applications section. Introduction 1 Front and Back Panel Layout . 2 Control Descriptions 3-5 Visual Indicators. .5 Rear Panel Connections . 6 Output from the PA-250 6 7 Other Rear Panel Connections 7 Other Connections (Front Panel] 7 Installations and Operation .8-10 PA-250 Applications 10-13 PA-250 Specifications 14 Front and Back Panel Layout © ©