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7Owners Manual6 monitoraudio.com

Bi-Wiring

How it Works

Bi-wiring is accomplished via separate pairs of terminals on the loudspeaker. In the case

of the GX Series, the bottom terminals connect to the bass driver(s) and the top terminals

connect to the tweeter in 2 way loudspeakers, or the mid and tweeter in 3 way loudspeakers.

The normal function of a loudspeaker crossover is to guide appropriate frequencies to the

appropriate driver/tweeter. Low frequencies to the bass drivers, mid frequencies to the

mid/bass drivers and high frequencies to the tweeter.

Fundamentally a loudspeaker crossover varies the impedance seen by the speaker and

by the power amplier. The situation is such that when the full range musical signal is

applied to the terminals of a full-range speaker system, the bass driver(s) only receives

low frequency signals, the mid driver receives the mid band frequency signals and the

tweeter only gets sent high frequency signals. This means that if separate speaker cables

are connected to the low frequency terminals, and the high frequency terminals, not only

have the drive units and the frequency’s directed and divided for them, but the two separate

speaker cables will now also carry different signals, the bass cable mostly the lows, and the

tweeter cable mostly the highs.

Once the high and low frequencies have been separated in this fashion, the strong current

pulses and surges demanded by bass drivers when reproducing bass or drums, will not

interact with the delicate sounds of a ute or cymbal.

The Effects

In a single wired system, unwanted mechanical and electrical resonances manifest as

distortion at both sets of speaker terminals. Due to the impedance of the speaker cables,

these distortions will not be entirely cancelled by the amplier. Instead, they modulate

between the two crossovers, and degrade sound quality. When bi-wiring, this interaction

is minimised as signal distortion is ‘seen’ at the amplier’s output where it can be more

effectively cancelled. Bi-wiring therefore presents a ‘cleaner’ signal at both the low frequency

and high frequency speaker terminals, and because the high and low frequencies have

already been separated, each has a minimal effect on the other - in essence the bass does

not overpower delicate treble.

In terms of the audible benet, bi-wiring, provides more clarity and detail to the midrange

and high frequencies. Often the bass will become faster and tighter. Focus and staging

will improve as well. In all, this is a very effective and desirable improvement and is highly

recommended by Monitor Audio.

WARNING: When bi-wiring always remove the cable jumpers between the

terminals before connecting any cables.

Port bungs

WARNING: Care must be taken not to insert the port bungs too far into the port,

as this may result in the foam bung being lost inside the cabinet.

If the loudspeaker is to be installed in a small room, typically 9 sqM ( 80 sqFT), or a room

known to reproduce accentuated bass response, it may be desirable to t port bungs.

However, experimentation is recommended with positioning of the loudspeaker in the room

prior to tting. To optimise performance from the loudspeaker it is important to ensure the

loudspeaker is not positioned too close to a wall or near the corners of a room (refer to the

suggestions on pages 8 and 10).

If the positioning of the loudspeaker is predetermined by room aesthetics or layout, or you

nd you have accentuated bass, please move on and read point 1 for the GX50/ GX100

and point 2 for the GX200/ GX300.

1. Where bookshelf/ stand-mount speakers (GX50 & GX100) are to be sited in close

proximity (less than 8 inches/ 20cm) to a rear wall (such as on a bookshelf, positioned

in a cabinet or on a stand sloce to a wall), we recommend tting port bungs to the

ports. This will reduce the bass ‘boom’ sometimes termed as overhang, and assist

the loudspeakers to reproduce their best performance under these environmental

conditions. ‘Boom’ is generally caused when bass energy from the loudspeaker

‘excites’ room modes and causes an accentuation at a particular frequency, or number

of frequencies.

2. Where oor-standing loudspeakers (GX200 & GX300) are to be sited in close proximity

(closer than 18 inches/ 45cm) to a rear wall, we recommend tting the port bungs. This

will reduce the bass ‘boom’ sometimes termed as overhang and assist the loudspeakers

to reproduce their best performance under these environmental conditions. This is

caused when bass energy from the loudspeaker ‘excites’ room modes and causes an

accentuation at a particular frequency, or number of frequencies.

When tting port bungs the overall bass extension will not be reduced, however bass

energy/ output around the port tuning frequency will be reduced. This has the effect of

reducing bass ‘boom’ while increasing bass clarity and apparent agility.

Experimentation is highly recommended.

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