EarthQuake SuperNova Luminous LU-12 Manuel du propriétaire - Page 8

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EarthQuake SuperNova Luminous LU-12 Manuel du propriétaire

Placing Your Subwoofer(s)

You often hear the term "subwoofers are non-di-

rectional." This is not true. It is harder to choose

subwoofer placement when low frequencies are

crossed. The wider the room, the more directional

the subwoofer. The easiest solution is to use two

(2) subwoofers, feed a mono signal to both and

place them in front, one on the left and another

on the right.

While having two (2) subs is better than one, the

MONO signal that drives those subs keeps them

from projecting the three dimensional images in

the sub-harmonics. Using two (2) subwoofers al-

lows you to cross the subs up to 250Hz sound

quality, imaging and staging. In some applica-

tions, you might have small front speakers or pla-

nar speakers. The two-front-subwoofer system is

an excellent solution to planar speakers' low fre-

quency response early roll oﬀ from 150Hz on

down. When placing these subwoofers in close

proximity to the stereo satellite, the subs will en-

hance low frequency extension. It will be better to

have a stereo subwoofer to help in the lower bass

notes and their placement.

Suppose you have only one (1) subwoofer in the

room and it is placed on the right side of the

room. If a bass guitar player was standing on the

left side of the stage and played an EE note (42Hz),

then the sub will also respond to that from the

right side of the room and completely destroy the

stage.

You will see illustrations showing the two (2)

diﬀerent suggested setups. In each of them, note

the breakaway and the image separation repre-

sented by the black and gray arrows.

The black arrows represent the

sub-harmonic frequencies

The gray arrows represent the

lows, mids, and highs as they fol-

low the action.

The best response is achieved when the subhar-

monic frequencies are dynamically synchronized

with the rest of the audio system, the black and

gray arrows are identical.

Single Subwoofer Setup

This is a GOOD setup. The sub-harmonic frequen-

cies (black arrow) always move towards the sub in

the single sub setup while the lows, mids, and

highs (gray arrow) follow the action.

8 LU-12/LU-15 Manual

Placing the subwoofer in the corner of the room

will produce a more boomy effect, often pre-

ferred for movies and sound tracks. For a music

application, place the subwoofer as show above

or against the front wall, about a third of the

room width.

Dual Subwoofer Setup With Mono

Signal

This is a BETTER setup. In a dual subwoofer

setup, the sub-harmonic frequencies (black ar-

row) always move towards the middle of the

room while the lows, mids, and highs follow the

action (gray arrow).

Notice the breakaway and image separation is

less in this setup than the single subwoofer setup.

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