Mark Levinson N40 User Manual download pdf (Page 80)

5-14

Menu System Mark Levinson

the sum of all active channels for whatever is being played in the

main zone, and is a full bandwidth mono signal. An appropriate

low pass filter must be applied to this signal before it is reproduced,

presumably in the subwoofer’s own electronics.

(Note that to ensure that all information is reproduced in this

scenario, any speakers that have a high pass filter associated with

them should use the same frequency, and that frequency must be

the same as is used by the external subwoofer crossover.)

Finally, there are two more options: we can specify that the low

pass filter on the subwoofer output be either an 18 dB per octave or

a 24 dB per octave low pass filter. The latter of these two crossover

slopes is the one advocated by THX for use with THX-certified loud-

speakers, and is denoted by “24 dB per octave, THX” in the menu as

a reminder.

Thus the subwoofer options are limited to defining the nature of

the crossover slope that will be employed (since the frequency

information is defined by what is “left over” from the high pass

portions of the crossover). In summary, they are:

• Complementary

•Full range

• 18 dB per octave

• 24 dB per octave, THX.

If you are using THX-certified speakers, you should use the THX

crossover frequency of 80 Hz and a low pass crossover slope of 24

dB per octave for the subwoofer. These options are listed as “80 Hz,

THX” and “24 dB per octave, THX” in the menu system, as a

reminder. These crossover settings are not required in order to take

advantage of the Home THX processing mode. Rather, they are

designed to integrate THX-certified loudspeakers into the system as

seamlessly as possible.

THX Audio Setup

This menu allows you to set up THX Ultra2 processing for your

speaker and room setup.

Boundary gain compensation

If your listening position results in most of the listeners being close

to the rear wall, the resulting bass level can be sufficiently rein-

forced by the boundary that the overall sound quality becomes

boomy. The Boundary Gain Compensation (BGC) feature provides

an improved bass balance. This menu is used to tell the Nº40

whether to allow or prohibit use of the BGC feature in your

listening position. You should only allow this feature to be used if

your subwoofer is THX Ultra2

certified or extends down to at least 20Hz.

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Mark Levinson N40 User Manual Page 80

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