User manual RANE RPM 26V

[. . . ] OPERATORS MANUAL RPM 26v DSP MULTIPROCESSOR QUICK START If you don't read all of this document, you risk setting up your system improperly. But at least read this section and the Input Trim section on page Manual-13. Paying careful attention to your system's gain structure and setting the RPM's Input Trim properly are essential in maximizing the noise performance of your entire system. (See the enclosed RaneNote "Setting Sound System Level Controls". ) Once you're done reading and memorizing the manual, please recycle the paper it is printed on by reconing an old speaker. [. . . ] Double clicking on most of these processing Blocks opens a detail window where most processing settings are edited. Assuming your computer screen provides enough graphics resolution, up to three of these detail windows can be open at any one time. In addition, a fourth window that displays the Overall Response curve for a given output can be opened by double-clicking any output's screw terminal graphic. The window can then be closed and the changed settings are retained in the working Memory (Memory zero). Changes are not stored in any other Memory until you save them with the Store button. It is possible to Alt-Tab to another Windows application from any RPM 26v window. This allows you to toggle between Windows applications and still keep the RPM 26v Detail Windows open on the screen. INPUT TRIM The Input Trim processing block is on the left side of the Device Edit screen, just to the right of the input screw terminal. This block is shown here: The Input Trim operates the RPM 26v internal analog level control whose sole purpose is to provide the analog-to-digital converter with the proper voltage level. Click on the up and down arrows to increment or decrement the Input Trim. For more precise control of the Input Trim, double click on the Input Trim block. You may double click anywhere except on the arrows or on the Mute button to open the detail window, shown below. The name of the processing block appears at the top of each detail window, in this case, input Trim A. Clicking the left or right arrows adjusts the trim in ½ dB steps. Clicking between the arrows and the sliding box (Thumb) adjusts the Trim in 5 dB steps. The Input meter on the left shows the voltage level (in dBu) at the screw terminal input of the RPM 26v. Clicking the input Mute button turns this meter off, even though Input signal may still be present. (The front panel's Input signal present LEDs always show the presence of incoming audio, `pre-trim. ') The A/D meter on the right shows the A/D level (in dB Full Scale), and indirectly shows the number of bits being toggled by the input signal after passing through the input level control. To set the Input Trim, please read the rest of this section and the A/D, D/A & METERING section below. With the amplifiers turned down or off and all of the RPM's outputs muted, apply your system's expected average audio level to the RPM 26v. The Input meter displays this voltage as long as the Input Mute is not active and the level is not set too high (clipping). The RPM 26v is designed to receive +20 dBu of input and send the same +20 dBu out. This +20 dBu is designed to be zero dB Full Scale (dBFS) at the A/D converter (i. e. , maximum input to the A/D converter) when the Input Trim is set to 0. 0 dB. [. . . ] If this helps significantly, the problem may be with the Input connection, or the equipment driving the Input. If Muting has little effect, the problem is likely either the Output connection, or equipment driven by the Output. The RPM 26v is intended to connect to equipment with balanced audio I/O. If you really must operate unbalanced equipment with the RPM 26v, please refer to Rane Note 110, "Sound System Interconnection" (next section) or The Journal of the AES Vol. [. . . ]