Mark Levinson N40 User Manual download pdf (Page 83)

5-17

Nº40 Media Console Menu System

speaker over another, adjust the output levels of each speaker in

turn to 75 dB SPL (C-weighted, slow). (The Nº40 will automatically

generate appropriate test signals when you move into the section of

the menu in which you can adjust output levels.)

When adjusting the subwoofer level, be sure to move the meter

back and forth around the listening position by at least a foot or

more (or about a half-meter) to average out the local effects of room

modes (standing waves). Doing so will give you a more accurate

measurement of the real subwoofer output in the listening area.

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. If this is the case for this particular listening position, turn

BCG on. If not, leave it off.

Disable this position

Four listening positions are more than you will probably need. This

option allows you to disable any unused listening positions so that

they do not show up in any lists or menus. Listening position one

cannot be disabled.

Bass Peak Limit

The last item in the speakers setup menu is a bass peak limit

control. This menu item establishes a maximum volume setting for

the subwoofer output, and is provided as a safety measure against

the possibility of overdriving your subwoofer into destruction.

Some powered subwoofers have built-in protection against over-

load, or have amplifiers designed to be incapable of destroying the

subwoofer driver itself. If your system employs this sort of protec-

tion, leave the bass peak limit at its maximum (and therefore

effectively disabled) setting. After all, the speaker designer knows

the limitations of his/her product better than either you or we can.

It is best to let the speaker designer decide.

However, many subwoofers lack any protection against being over-

driven, other than your own discretion in using the volume

control. While this discretion is always a good thing – if your

system starts to sound distorted, “fuzzy” or garbled at high

volumes, turn it down! – some people might prefer to have the

system itself provide a measure of additional protection. This task

falls to the bass peak limit item of the speaker menu.

In discrete multichannel digital audio, it is possible to have six (or

more) channels of information that contain deep bass information.

In many cases, the only speaker in the system that can reproduce

deep bass is a single subwoofer. If one subwoofer is expected to do

the work of six speakers, and the listener-controlled volume is

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Mark Levinson N40 User Manual Page 83

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