MartinLogan The Quest Speaker System user manual Active Bi-Amplification, Contouring Switches

OUTPUT INPUT

Preamplifier

OUTPUT	Amplifier	OUTPUT
INPUT		INPUT

Figure 4. Vertical passive bi-amplification. One channel shown. BI-WIRE/BI-AMP

0dB Flat -3dB

-3dB -6dB

20Hz200Hz

Effects of the Bass Contour Switch

+2dB	+2dB
0dB
-2dB
	2.5kHz

100Hz20kHz

Effects of the Presence Contour

Switch

Figure 5.

Effects of the Contouring Switches

Active Bi-Amplification

The passive crossover elements in the Quest are very complex electrical devices with unique voicing and equal- ization. They cannot be replaced with a standard electronic crossover. If, at some time, a properly designed electronic crossover for the Quest becomes available from Martin- Logan, the owner of warranty will be sent notification.

Contouring Switches

Because of the wide variety of room environments, record- ing techniques and customer preferences that we feel are important issues for today's premier loudspeaker designers to address, we have provided the Quest with two switches that will give you more flexibility and control over the final sound.

Bass Contour Switch.

The Bass Contour switch is a two-position switch that allows you to tailor the low frequency response of the Quest. The Flat position is considered the normal setting

for most rooms. However, if you feel that the bass in your system is too strong relative to the mid-range and high frequencies, simply select the -3 dB position. This switch position will attenuate the woofer response by 3 decibels below 200Hz. With the Flat position selected, the Bass Contour circuit is removed from the audio signal path, thereby eliminating any possibility of signal degradation caused by added circuitry.

Presence Contour Switch.

The Presence Contour switch is also a two-position switch that allows you to tailor the mid-range response (presence) of the Quest. The Flat position is considered the normal setting for most rooms. However, if you would like more presence, select the +2dB position. This switch setting will cause a 2 decibel rise centered around 2.5kHz. With the Flat position selected, the rise is eliminated. Please refer to the graphs in Figure 5 showing how these switch settings effect the response of the Quest.

Some experimentation with these two switches will allow you to find the optimal tonal balance to meet your specific tastes, room environment and audio equipment.

Quest User's Manual Page 13