Madrigal Imaging Audio/Video Preamplifier manual 9MUTE, 10SUB, 11REFERENCE LEVEL INDICATOR

9MUTE

Pressing the mute button will reduce the main output level of the preampli- fier by a user-modifiable amount, ranging from 2.5 to 55 decibels (5 to 110 in the main display). Pressing the mute button a second time without ad- justing the volume will return it to its previous setting. If you adjust the vol- ume with either the front panel buttons or the remote control while in the mute mode, the preamplifier will adjust its volume from the muted volume and disengage the mute function. The factory default setting of the mute circuit is -20 dB (a change of 40 units in the Main Display). (See Using the PAV for information on changing the factory default setting.)

10SUB

Pressing this button followed by the volume adjustment buttons will alter the volume of the Subwoofer(s) relative to all other speakers. The resulting offset will be indicated in the main display, as well as by the on screen dis- play.

11REFERENCE LEVEL INDICATOR

This LED indicator is lit when the PAV is playing at Home THX reference level (normally calibrated during initial setup—see Output Level Calibra- tion, p. 36).

12RECALL BUTTON

Pressing the recall button restores the PAV to its calibrated reference set- tings for the relative output of all speakers. This is especially helpful after having experimented with various settings of balance, center, rear, or sub, or when comparing a modified surround default to “flat” balance, since one touch of a button will restore your preamplifier to its original state (as de- termined by the setup calibrations stored in memory; see System Setup & Calibration and Using the PAV for more details).

13DELAY BUTTON

Pressing this button allows you to adjust (using the volume adjustment but- tons) the delay introduced to the signal being sent to the rear channels, between 15 and 30 milliseconds (mS). (See Setting the Surround Delay, page 37, for more details.)

14INPUT LEVEL BUTTON & INDICATOR

Pressing this button adjusts the input level (or offset) on the main signal path. Together with the input level indicator in the main display immedi- ately above it, it may be used to compensate for variations in level among sources. This adjustment is important primarily for movie sources (since Dolby Pro Logic circuitry is level-sensitive by its nature). When the Input Level is set correctly, the green indicator LED should be on most or all of the time during loud passages, but should never turn red (which would in- dicate an overload condition).

If overload should occur, pressing the input level button followed by the volume – button will reduce the input level. Do so until the indicator re- mains green during even the loudest passages.

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