Denon AVR-1803 Operating Instructions Manual page 21

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Use the 0 (left) and 8 (right) buttons to select your surround back speaker type.
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(Initial)
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(left) button (right) button
Press the ENTER or a (down) button to switch to the subwoofer setting.
NOTE:
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When "Small" has been selected for the surround speakers, "Large" cannot be selected for the surround back speakers.
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This setting is not displayed when the POWER AMP ASSIGN switch on the main unit's rear panel is set to "ZONE 2". (See page 4)
Use the 0 (left) and 0 (right) buttons to select your subwoofer setting.
(Initial)
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(left) button (right) button
Press the ENTER or a (down) button to enter the settings and switch to the SUBWOOFER MODE
settrng.
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Parameters
Large.. Select this when using speakers that can fully reproduce low sounds of below 80 Hz.
Small...... Select this when usrng speakers that cannot reproduce low sounds of below 80 Hz with sufficient volume. When this setting is
selected, low frequencres of below 80 Hz are assigned to the subwoofer.
None.... Select thus when no speakers are installed.
Yes/No.... Select "Yes" when a subwoofer is installed, "No" when it's not installed.
NOTE:
Select "Large" or "Small" not accordrng to the physical size of the speaker, but according to the bass reproduction capacity at 80 Hz. If you cannot
determine the best setting, try comparing the sound when set to "Small" and when set to "Large", at a level that will not damage the speakers.
Caution:
In case the subwoofer is not used, be sure to set "Subwoofer = No", or the bass sound of front channel is divided to subwoofer channel and
not reproduced in some mode.
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