Bose E4 manual To add a subzone, Input gain circuit block diagram, To delete a subzone

6.0 E4 System Setup

Programmer’s Note: If you are using the E4 system to drive speakers that are not Bose® products, choose the No EQ setting or one of the four high-pass filter settings at the end of the list.

The No EQ setting helps protect the E4 against loudspeaker trans- former saturation when non-Bose loudspeakers are connected to the E4 hardware. This setting acts as a band pass filter and allows energy between 80 Hz and 16 kHz to be sent to the amplifier sec- tion of the E4 electronics.

If you change the speaker EQ type, any subzones will be automati- cally changed to the new Speaker EQ setting, and be given the default loudspeaker tap. Depending on the quantity and tap of speakers, you could receive an error message notifying you that the system exceeds the 400 W limitation of the E4 system. If this prob- lem occurs, delete the subzones from the subzone list. This will allow you to change the speaker EQ type.

Subzones table – The Subzones table allows you to document the speakers used in a zone.

A zone is a group of speakers that are driven by the same ampli- fier output channel. A subzone is a group of speakers within a zone that use a common tap or are of a common type.

For example, you may have installed ten Model 16 speakers in a dining room and set it up as a zone to be driven by channel 1. In this zone you may have established two subzones, one with five Model 16 speakers tapped at 8W and the other with five tapped at 16W.

To add a subzone

Click the Add button. When the Add Subzone window appears, enter a name for the new subzone, select the speaker model installed, enter the quantity, and select a tap setting. The Model Name list will include only speakers that are compatible with the Speaker EQ you selected.

Click OK to add the selections to the subzone table.

6.3.3 Input gain

The Input Gain controls allow you to adjust functions related to the input source signal.

Source type	Gain	Input signal
	slider	level meter

®

Mic phantom	Signal	Opti-source
power On/Off	present	input leveling
	indicator	On/Off

Factory default settings

Input Type	Initial Gain	Gain Range	Opti-source
Mic	40 dB	80 dB	Off
Line	0 dB	70 dB	Off
Mic Page	40 dB	80 dB	On
Line Page	0 dB	60 dB	On

Programmer’s Note: Input gain controls are disabled if the input channel is routed to a zone in which Auto Vol- ume is enabled (on). You will only be able to change/ adjust the input gain by resetting the Auto Volume for the affected zone.

Input gain circuit block diagram

Gain	Signal	3-band	Opti-source
adjustment	level	equalizer*	leveling
	meter

To delete a subzone

In the subzones table, select the subzone to be removed and click the Delete button.

EQ SRC

LEVEL

Signal detector

*Only available for MIC/LINE and MIC/PAGE/LINE inputs. See “Source EQ” on page 50.

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