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Subwoofer Placement Guide

Why having two gains on a mono subwoofer is 
a good thing?

Often you hear the term “subwoofers are   non-directional”; 
this is not true subwoofer placement is harder to pick when to  
low frequencies are crossed  . The wider the room, the more 
directional the subwoofer. The easiest solution is to use two 
subwoofers in the front: one on the left and a second on the 
right. The signal to both is mono. In some applications, users 
might  have  small  front  speakers  or  planer  speakers.  Both 
speakers  have  an  early  roll  off  in  the  sub-harmonics.  The 
planer  needs  help  from  150Hz  on  down,  having  two  front 
subwoofers  placed  on  the  left  and  the  right  is  a  health 
solution to this problem.  

Two Subs

While having two subwoofers is better than one, the MONO 
signal  that  drives  these  subwoofer  keeps  them  from 
projecting  the  three  dimensional  images  in  the  sub-
harmonics. The use of  two subwoofers  allows you to cross 
the sub up to 150 Hz sound quality, imaging and staging. The 
two-front-subwoofer-system is an excellent solution to planer 
speaker’s  low  frequency  response  early  roll  off.  When 
locating these subwoofers in a close proximity to the stereo 
satellite, the subs will enhance   low frequency extention. It 
will be better to have a stereo subwoofer to help in the lower 
bass notes and their placement. 

If a bass Guitar player was standing on the left side of the 
stage, and he played an EE note (42Hz) then the right sub will 
also respond to that and create havoc on the stage. In fact if 
you only have one single sub in the room and it’s placed on 
the  right  side  of  the  room,  while  the  bass  guitar  player  is 
playing his music on the left side of the stage. As soon as he 
hits  the  EE  note  the  sub  speaks  out  on  the  right  and 
completely  destroys  the  stage.  To  give  you  three-
dimensional  front-end  bass  that  allows  you  to  have  a  low 
frequency dynamic stage, Earthquake designed dual input 
circuits that use buffers to maintain your stereo separation on 
the  processor  side  while  mixing  stereo  front  signals  to 
produce 3D bass.

The  blue  arrow  represents  the  sub-harmonic 
frequencies  as  they  move  always  toward  the 
middle  in  a  mono-two-subs-  system The  red  arrow 
represent the lows+ the mids+ highs as they follow 
the  action,  Note  the  breakaway  and  the  image 
separation

BETTER

 / 

This illustration shows dual subwoofer with mono signal

4

In  this  illustration  the  stereo  subwoofers  keep  the 
s u b - h a r m o n i c s  d y n a m i c a l l y  s y n c h r o n i z e d  i n 
motion  with  the  rest  of  the  audio  systems.  Fully 
complementary sub-harmonics to the mids and the 
highs

BEST

 / 

This illustration shows dual subwoofers with mono signals

GOOD

 / 

This illustration shows a single subwoofer setup

The  blue  arrow  represents  the  subharmonic 
frequencies as they move always toward the sub in 
the single sub system The red arrow represents the 
lows+  mids+  highs  as  they  follow  the  action  Note 
the  breakaway  and  the  image  separation.  Best 
response if the blue and the red are identical

Specifications Are Subject To Change Without Notice

IQ Subwoofer Power Amplifier

Содержание IQ1500

Страница 1: ......

Страница 2: ...w it to deliver World Class performance even under extreme operating conditions The is a ruggedly constructed high quality professional amplifier The Digital feedback class J Circuitry allows the ampl...

Страница 3: ...risk of fire or electric shock do not expose this product to rain or moisture Don not attempt to lift the ground by removing the ground pin from the AC cable Make sure that your household electrical...

Страница 4: ...n the right sub will also respond to that and create havoc on the stage In fact if you only have one single sub in the room and it s placed on the right side of the room while the bass guitar player i...

Страница 5: ...Subsonic Filter 20 30 and 40Hz Room Equalization With 12dB range and Boost Required LFE Inputs Use One Only PHASE SHIFT 0 180 1 RCA XLR SPK 2 RCA XLR SPK GAIN 1 GAIN 2 PHASE DELAY 0 20ms SUBSONIC EQU...

Страница 6: ...TECKER ZIEHEN BEFORE OPENING PULL MAIN PLUG PHASE SHIFT 0 180 1 RCA XLR SPK 2 RCA XLR SPK GAIN 1 GAIN 2 PHASE DELAY 0 20ms SUBSONIC EQUALIZER ON OFF ON OFF 20Hz 6dB 6dB 30Hz 6dB 6dB 40Hz 6dB 110 120VA...

Страница 7: ...6dB 110 120VAC ON 6dB OFF POWER 110 120V 60Hz 220 240 50Hz 600W CROSSOVER 40Hz 200Hz ON BY PASS AUTO IR INPUT 220 240VAC POWERED SUBWOOFER CAUTION VORSICHT VOR DEM FFNEN NETZSTECKER ZIEHEN BEFORE OPE...

Страница 8: ...ference This information deals only with time correction that moves the peaks and the dips in a room to a flat Once that is achieved the user will resort to the final correction EQ the room For that r...

Страница 9: ...ono 1 distortion 20Hz 2kHz 0 08 1W 4ohm 55 volts microsecond 106dB balanced 105dB unbalanced rated power 2 ohms or greater 500 XLR RCA High level Binding posts Locking mechanism Phase switch 0 180 Var...

Страница 10: ...h the product In Products sent for repair that are tested by Earthquake technicians most cases our technicians might be able to resolve the problem over the and deemed to have no problem will not be c...

Страница 11: ...t your audio system to a comfortable loudness level Earthquake Sound Corporation does not assume liability for damages resulting from the direct use of the IQ1500 and urges users to play the IQ1500 at...

Страница 12: ...Earthquake Sound Corporation www earthquakesound com 2727 McCone Avenue Hayward California 94545 Phone 510 732 1000 Fax 510 732 1095 Sound That Will Move You...

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