User's Manual

Table Of Contents

T SERIES MANUAL [ENGLISH]

6. USING THE HF AND LF SWITCHES ON

THE REAR PANEL

On the rear panel for each T Series monitor, two 3-way switches labeled “LF” and “HF”

boost or cut the monitor’s respective high- and low-frequency responses by 2 dB. Each

switch also provides a neutral middle position, labeled “0,” that produces flat response

in their frequency range. If you’ve placed your T Series monitors optimally [see Section

2 of this manual], you’ll probably find that your T Series monitors sound the most

balanced

with both switches set to the “0” [flat] position.

A brief review of how room acoustics can affect loudspeaker performance will help you

get the most out of using your T Series monitors’ LF and HF switches:

Sound bouncing off bare walls and, typically to a lesser extent, the ceiling in your

control

room can create very short echoes that distort imaging and phase response

back at your mix position. Properly treating your room with acoustic foam or high-

density fiberglass sound panels reduces or prevents these problems by absorbing the

sound, rather than reflecting it back to your mix position. However, foam and fiberglass

sound panels absorb mostly high, midrange and—depending on the material used and

its thickness—upper-bass frequencies. [The thicker the material, the lower the extension

of frequencies that are absorbed, with high-density fiberglass absorbing frequencies

roughly a full octave lower than open-cell foam for the same thickness. For example,

both 2”-thick fiberglass wall panels and 4”-thick acoustic foam typically absorb sound

effectively down to around 250 Hz.] Because these materials absorb sound most effectively

in the treble range, a room heavily treated with acoustic foam or fiberglass sound

panels can make any loudspeaker’s playback of high frequencies sound muffled. To

store clarity and detail, your T Series monitors provide a HF switch setting that boosts

high-frequency response 2 dB.

Another acoustic phenomenon to keep in mind when placing your monitors in your

room is the boundary effect. The closer you place a loudspeaker to a room boundary

— a wall, floor or ceiling — the more bass frequencies will be acoustically boosted. To

preserve your T Series monitors’ flat frequency response, it’s important to nullify the

boundary effect by placing them at least 16 inches away from any wall. This is also

portant in order to prevent physical interference by the wall behind the monitors with

the cabinets’ rear-firing bass reflex ports. If ergonomics require you place your T Series

monitors close to a wall, setting the LF switch on the rear panel to the “-2 dB” setting

will cut the bass response an equal amount and help restore flat spectral balance.