Parasound Stereo Equalizer TDQ 150 User Manual

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R/EQ-150 Room Equalizer  
Congratulations on your purchase of this precision audio component and thank you for choosing  
Parasound. We are sure that you will find the R/EQ-150 to be a very useful problem solving tool. Even  
if you have used an equalizer before, please take time to review this manual to take complete advantage  
of the R/EQ-150’s unique capabilities.  
Level  
s
Bypas  
6
kHz  
z
2.5 kH  
z
120  
H
80 Hz  
40 Hz  
Product Overview  
Loudspeakers interact with every room differently. Often room acoustics are challenging and  
compromises in speaker size and placement have to be made for aesthetic reasons. Consequently, the  
quality of sound may not be as good as intended. Your Parasound R/EQ-150 permits you to subtly  
adjust the frequency response characteristics in these situations and improve overall sound quality.  
The Parasound R/EQ-150 has one-half octave width ±8 dB boost and cut controls centered at 40 Hz,  
80 Hz, 120 Hz, 2.5 kHz and 6 kHz. These frequency ranges were carefully selected so that you can  
easily make precise improvements in frequency response curves in difficult installations while  
minimizing potential adverse effects should the controls become accidentally misadjusted.  
Unpacking the R/EQ-150  
You should find the following items within the packing carton:  
The R/EQ-150  
An 18 AWG audiophile-grade AC cord  
Owner's manual  
Save your carton and packing inserts for safe transport in case you move or the unit ever requires repair.  
If you ever need to ship the R/EQ-150 to us, be sure to pack it into an additional outer carton for  
protection against shipping damage. Locate the serial number for the R/EQ-150 on the bottom of the  
unit and record it here for future reference: __________________  
 
R/EQ-150 Owner's Manual  
Operating Your R/EQ-150  
Adjusting the R/EQ-150 Level Control  
Once you have installed the R/EQ-150 into your system, set all its frequency controls to their center  
detented positions. Next, set the volume control on your preamp or receiver to a comfortable level.  
Finally, adjust the level control on the R/EQ-150 so that the relative output level through the speakers is  
the same when its bypass switch is switched in and out. This establishes a “unity gain” position. You  
may boost or cut the overall level of the R/EQ-150 with this control as desired for best signal to noise  
performance.  
Bypass Switch  
The bypass switch is a handy way to compare music with and without equalization. In the on  
(depressed) position, the signal from the preamplifier is routed around all of the equalization circuits  
while leaving the level control active. This allows you to instantly compare between flat and equalized  
settings without having to individually readjust the frequency controls to flat. An LED alerts you to the  
bypass status.  
Level  
Bypass  
6
kHz  
2.5 kHz  
120 Hz  
80 Hz  
40 Hz  
Drawing # 2: Front Panel Controls  
Adjusting the R/EQ-150 Frequency Controls  
Before adjusting the R/EQ-150 frequency controls, make certain that all tone controls, loudness buttons,  
and other filters on your preamplifier or receiver are set at their flat or bypassed positions. This helps  
avoid interaction between multiple equalization circuits that can adversely affect the sound or overload  
your amplifiers or speakers.  
40 and 80 Hz Low Bass Adjustments:  
The 40 Hz and 80 Hz controls have an adjustment range of ±8 dB and a frequency bandwidth of  
one-half octave. Turning these controls clockwise (boosting) adds very low bass so often missing from  
smaller or in-wall loudspeakers. Turning these controls counterclockwise (attenuating) can help reduce  
unwanted low frequencies that may contain inaudible information that can waste amplifier power and  
strain woofers. Attenuating these controls can also help tame boominess when speakers are mounted  
near room boundaries where bass is acoustically reinforced. The 80 Hz control will have a greater  
audible effect simply because most music contains more information at 80 Hz than at 40 Hz.  
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Parasound  
120 Hz Mid Bass Adjustment:  
The 120 Hz control has an adjustment range of ±8 dB and a frequency bandwidth of one-half octave.  
Turning this control clockwise (boosting) can add mid-bass information to speakers with smaller  
woofers or speakers mounted in ceilings. Turning this control counterclockwise (attenuating) can  
tighten up muddy bass from speakers that are mounted in corners that reinforce bass frequencies.  
2.5 kHz Upper-Mid Range “Presence” Adjustment  
This is the range in which your ear is most sensitive. Small adjustments will have very noticeable  
effects. Turning this control clockwise (boosting) adds intelligibility in acoustically absorptive rooms.  
Turning this control counterclockwise (attenuating) can help compensate for speakers with overly  
pronounced mid-range frequencies in acoustically "live" rooms.  
6 kHz Upper-Mid Range “Air” Adjustment  
Boosting the 6 kHz control can help add a sense of “airiness” to many recordings and can compensate  
for off-axis high frequency deficiencies of tweeters. Attenuating this control can help remove some  
digital harshness and restore proper balance in very live rooms that may accentuate high frequencies.  
Reference Settings:  
Once you have adjusted your R/EQ-150, use the drawings below and use a pencil to mark the optimum  
settings for each control knob. That way, if the R/EQ-150 becomes accidentally misadjusted, you can  
easily return the frequency controls to their pre-adjusted level. You may wish to copy this drawing and  
attach it to the unit for future reference.  
R / E Q - 1 5 0 R o o m E q u a l i z e r  
40 Hz  
80 Hz  
120 Hz  
2.5 kHz  
6 kHz  
Bypass  
Level  
Reference Drawing #1  
R / E Q - 1 5 0 R o o m E q u a l i z e r  
40 Hz  
80 Hz  
120 Hz  
2.5 kHz  
6 kHz  
Bypass  
Level  
Reference Drawing #2  
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R/EQ-150 Owner's Manual  
R/EQ-150 Specifications  
Frequency Response (Frequency Controls at Center Detent)  
20 Hz-20 kHz +/- 0.5 dB  
Frequency Control Center Frequencies  
40 Hz, 80 Hz, 120 Hz, 2.5 kHz, 6 kHz  
Frequency Control Bandwidth  
1/2 Octave  
Frequency Control Range  
+/- 8 dB  
Voltage Gain: (Frequency Controls at Center Detent)  
14 dB  
Signal to Noise Ratio  
88 dB  
THD  
Less than 0.05%  
Specifications subject to change or improvement without notice  
-5-  
 
Parasound Products, Inc. 950 Battery Street, San Francisco, CA 94111  
415-397-7100 / FAX 415-397-0144  
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