Hafler Stereo Equalizer MAQ 104 User Manual

OWNER’S MANUAL  
OWNER’S MANUAL  
MAQ-104 CAR AUDIO  
OCTAVE EQUALIZER  
A
Division of Rockford  
613 South Rockford  
Tempe, AZ 85281  
602-967-3565  
Corporation  
Drive  
 
INDEX  
. Page 1  
Page 1  
Introduction  
. . . . . . . . . . . . . . . . . . . . . . . . . . .  
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
.Page 2  
Nomenclature  
. . . . . . . . . . . . . . . . . . . . . . . . . . .  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
. . . . . . . . . . . . . . . . . . . . . . . . . . . .  
.Page 3  
.Page 5  
Installation  
Equalization  
.Page 8  
Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
.Page 9-10  
.Page 11  
Possible Equalization Curves. . . . . . . . . . . . . . . . . . .  
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Possible System Configurations. . . . . . . . . . . . . . . . . .  
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
.Page 12-17  
.Page 18  
 
INTRODUCTION  
Congratulations on your selection of the Hafler MAC-104  
Octave Equalizer. You have acquired a product that will  
greatly enhance the performance of your auto sound sys-  
tem. Because of the sophistication of this advanced  
electronic device, we recommend that you thoroughly  
understand the contents of this manual before operation  
and installation  
FEATURES  
Full  
4
channel operation maintains ability to fade.  
> Single chassis provides straight forward installation  
10 Bands per channel for optimal adjustment.  
> + 12dB of boost and cut per band.  
> Each channels flat position is located by a center click  
in each potentiometer.  
Defeat switching front and rear.  
> Perfect for trouble shooting.  
> Aid in vehicle curve adjustment  
> Can be used for 2 channel dual curve installation  
(See Figure 6)  
Multi-Mode operation.  
> 4 channel 4 way  
> 2 channel 2 way  
> 2 channel dual curve  
Programmable remote turn-on delay circuitry.  
> Switch selectable delay times from .5 to 4 seconds  
>
Remote in from source unit is delayed and then  
passed on to the amplifiers.  
> Provides a delay period for the stabilization of all  
electronics prior to amplification.  
> Eliminates turn on/off thump.  
Gold plated RCA Connectors  
 
1
Hinged top provides easy access to crossover modules.  
>
Detailed owner’s manual located conveniently inside  
hinged top.  
>
>
Cosmetically "clean” look enhances any installation.  
Mounting holes concealed internally.  
Output sensitivity adjustment.  
>
>
Insures compatibility with any radio or head piece.  
Independent adjustment per channel.  
NOMENCLATURE  
Refer to figure  
1
for the location of the inputs, outputs,  
potentiometers, and various switches used in the con-  
figuration of the MAQ-104.  
Front/Rear defeat switch: These two switches will either  
make the MAQ-104 circuitry active or bypass it completely.  
See Figure  
1
for active/defeat positions.  
Delay switch: These dip switches are used to program the  
remote turn-on delay period.  
Frequency band boost and cut: Each adjustment poten-  
tiometers on the MAQ-104 will allow you to boost by turning  
any potentiometer clockwise, and cut by turning counter  
clockwise.  
WARNINGS  
To prevent possible system damage, please follow the  
guidelines below.  
>
Never connect or disconnect any component of the  
sound system while power is applied to the system.  
>
Prolonged exposure to high sound pressure levels  
can cause hearing impairment  
-
please use common  
sense when listening to your auto sound system.  
2
 
INSTALLATION  
The MAQ-104 is a precision piece of electronic equipment  
and with proper installation will provide years of trouble-free  
operation. The following steps will help to reduce the  
amount of time and effort required to install the MAQ-104  
> Consult a professional installer if necessary  
>Mount the unit securely in a clean, dry location using  
the four internal mounting holes. The four mounting  
holes are located adjacent to the circuit board  
> Make sure the installation does not interfere with the  
normal operation of the vehicle  
POWER CONNECTOR  
The four power wires on the MAQ-104 should be connected  
as follows:  
Yellow  
-
connect to the + terminal of the  
battery.  
Red  
-
Connect to the remote turn-on lead from the  
source.  
Black  
-
Connect to the chassis of the vehicle The ground  
point in the car should be a piece of chassis metal that  
is welded to the main body of the car. Painted surfaces  
should be scraped or sanded before the ground lug is  
bolted down, (Cover the bare metal area with paint or  
grease to prevent rust.)  
Blue  
-
Connect to the remote turn-on leads of the amps  
FUSES  
The battery wire (yellow) is fused on the circuit board with  
an AGC 1 amp fast blow fuse. The remote out wire (blue)  
is also fused on the circuit board with an AGC 1/2 amp fast  
blow fuse. In order to assure continued protection, replace  
only with the proper fuse values. See Figure 1 for proper  
fuse locations.  
PROGRAMMABLE TURN-ON DELAY  
The MAC-1 04 has the capability to delay the remote turn-on  
voltage to the amplifiers by a period of up to 4 seconds.  
This delay period is necessary in order to allow the signal  
3
 
processing circuitry prior to the MAQ-104 sufficient time to  
stabilize before power is applied to the amplifiers. This  
results in minimum turn-on/turn-off thu.mp.  
To program the turn-on delay period, set the relay dip  
switches as shown below:  
TIME  
1
2
0.5  
1.0  
2.0  
4.0  
ON  
ON  
OFF  
OFF  
ON  
OFF  
ON  
OFF  
FRONT/REAR DEFEAT SWITCHES  
The switches in figure  
1
are shown in the active position  
(in the up position with the power connector on your upper  
left.) By pushing the toggle down this defeats each respec-  
tive front and rear channel.  
FREQUENCY BAND BOOST AND CUT  
On the MAQ-104 there are 10 bands of center frequency  
boost and cut. By selecting  
a
frequency noted on the PC  
board you can boost or cut any band. Boost is ac-  
complished by tuning the potentiometer clockwise. Cut is  
done in reverse fashion counter clockwise. The flat posi-  
tion is noted by  
a
center detent on each potentiometer  
INPUT LEVEL SENSITIVITY  
The MAQ-104 is designed to be used at pre-amp and radio  
output levels only (500 to 750 mVRMS). Higher input levels  
to the MAQ-104 may overload the circuitry and must be  
attenuated.  
OUTPUT SENSITIVlTY ADJUSTMENT  
There are four output gain adjustment potentiometers on  
the MAQ-104. The output levels must be set in such a way  
as to not overdrive the amplifiers.  
A proper adjustment can be achieved by adjusting both the  
source unit and MAQ-104 output levels. If you find that your  
4
 
over driving the amplifiers turn down the output levels of  
the source and then fine adjust the MAQ-104.  
EQUALIZATION  
Response problems created by the audio environment (the  
car’s acoustics) usually can be corrected with good  
a
quality equalizer that has flexible and precise adjustment.  
The MAQ-104 provides this flexibility and precision.  
Response problems created by poor system design must  
be corrected at the amp and speaker level.  
EQUALIZING WITH A REAL TIME  
ANALYZER  
For best resolution, a 30-band (1/3-Octave) Real-time  
Analyzer (RTA) or  
a
swept spectrum analyzer with 1/3-Oc-  
tave resolution should be used. A lo-band, 1-Octave  
resolution RTA will give decent results, but is harder to use.  
Either RTA method will require  
a
pink noise generator.  
STEP BY STEP  
1) Extend MAQ-104 input/output cables and  
B
+
,
turn-on  
and ground to convenient location outside the vehicle.  
a
(A kit is available from your Hafler dealer.)  
2) Test the system to ensure proper function  
-
“zero” all pots  
and check level by switching the defeat switch quickly.  
3) Position microphone and stand in car seat, head height,  
ear level (preferably inside ear) with microphone facing  
forward. Microphone placement will have  
a
significant  
effect on frequency response, and moving the microphone  
around in the driver’s area will give a good idea of overall  
response.  
4) Calibrate RTA.  
5) Input pink noise to MAQ-104 on channel corresponding  
with microphone placement. Set volume level to 90-100  
dB.  
5
 
BE CAREFUL! PINK NOISE CAN HURT SPEAKERS AT  
EXCESSIVE VOLUME. MAKE SURE VOLUME ON PINK  
NOISE GENERATOR IS DOWN BEFORE TURNING ON.  
6) Observe output response  
7) Turn off pink noise and re-input source. Listen to system  
with  
a
piece of music you are familiar with. (NACA disc)  
Does system sound like it looks? If not, reposition  
microphone until system response looks like it sounds.  
Major system problems, for instance large response “holes”  
or “peaks”, should be solved by correcting speaker or  
system problems. Trying to equalize out large response  
errors (over  
6
dB) will result in overdriven amplifiers and  
speakers, and should not be attempted  
8) Once microphone placement has been verified, recon-  
nect pink noise.  
9) Begin to equalize by first adjusting the frequency posi-  
tions that need to be effected. Since adjacent bands inter-  
act with each other, you will need to go back and forth  
between frequencies to get the best balance  
10) Periodically verify curve by listening to your reference  
music. Equalize one channel at  
a
time. Compare your  
“EQ’d” curve with the original response by switching defeat  
If it isn’t getting better, return to zero and start  
switch  
again.  
11) Once one channel is correctly adjusted, the other  
channel will come easy. Move the microphone to the  
opposite side, change the pink noise channel, and equalize  
for the same response.  
12) Make any fine tuning adjustments while listening to both  
channels  
simultaneously.  
13) Reinstall MAQ-104  
functioning.  
into car. Listen to verify proper  
SOME SUGGESTIONS:  
>
It is best to equalize one channel at a time. Trying to  
set all four channels at once confuses which channel  
is producing the results.  
>
If you can identify a response problem by ear, move  
the microphone to  
a
point that reveals the problem  
Mike placement can have  
a
very large effect on  
6
 
response, and some microphone positions will  
obscure problems instead of showing them.  
>
>
The audible effect of response problems is a product  
of both the magnitude of the error and its width.  
A
9-dB “hole” one/third octave wide is less audible than  
a
2-dB “dip” two octaves wide. Try for an average  
response equally above and below the desired  
response over each octave span.  
The human ear averages the overall sound-field  
response by complex physiological and psychologi-  
cal processing.  
A
single microphone only hears at  
one point, which must be selected to represent as  
closely as possible the overall sound field. Since  
tonal perception is most influenced by the nearest  
source, we usually equalized each side separately.  
The mike is set up at the driver’s listening location,  
facing forward, and the left channel is equalized  
Then the mike is set up at the passenger’s location  
and the right channel is set up to match the left. This  
procedure usually gives good results  
EQUALIZATION GOALS  
The primary goal of the MAQ-104 is to produce  
a
smooth  
response approaching desired curve, eliminating or  
a
reducing peaks and valleys in our system response  
A system can be equalized for a flat response but in most  
cases this is a dry and flat response. The best equalization  
is the one that fits your style of music For example: a curve  
with the bass boosted would be more realistic to  
a
Rock  
and Roll type of person, where a partial boost in this section  
would be more natural to Symphonic Music  
Figures 2-5 show some typical “good-sounding” system  
response curves. Curve “2” is  
a
good general-purpose  
goal. Curve “4” with increased bass will give more impact  
on Rock-and-Roll, while “3” would sound more natural for  
Symphonic Music. Curve ”5" illustrates reduced roll-off rate  
in the mids and highs. These curves are only examples,  
and the best curve is the one that suits your listening style  
 
 
 
SPECIFICATIONS  
The MAQ-104 is deliberatdy restricted to 12 dB of boost or  
cut per band. This is meant to discourage attempts to  
correct large system response problemswith the equalizer.  
System response errors greater than about  
6
dB over  
a
span of an octave or more should be corrected elsewhere  
in the system, by correcting speaker or amplifier problems.  
Excessive use of equalization is likely to overdrive  
amplifiers, speakers, or other components.  
INPUTS  
Input Level  
=
750mV RMS  
20K Ohms  
Input Impedance  
OUTPUTS  
=
Output Level = 750 mV RMS  
ELECTRICAL  
Output Impedance =500 Ohms  
Distortion = Less than .01% THD + N  
Signal to noise ratio  
Filter Q = 2 typical  
=
over 90 dB (A-weighted)  
Power Required = less than 1 amp at 12 volts typical.  
PHYSICAL  
Dimensions = 8.000H  
Weight Ibs.  
x
10.125W  
x
1.75D.  
=
3
 
11  
 
 
 
 
 
 
WARRANTY  
From 1 year from the date of purchase (The Warranty  
Period), Hafler warrants that any unit which fails to function  
properly under normal use due to a MANUFACTURING  
DEFECT, when installed and operated according to the  
Owner’s Instruction Manual enclosed with this unit, will be  
repaired or replaced, at Hafler’s option, without charge to  
you for parts or labor for the actual repair work.  
Proof of purchase must be provided with the returned unit  
to insure full benefit of the warranty period, for if not, Hafler  
will be unable to honor the warranty, labor and pans will be  
charged to you.  
The product must be delivered within the warranty period,  
transportation prepaid, to the Hafler Factory, or an  
authorized Hafler warranty service station together with  
evidence of date and place of original retail purchase  
This warranty does not cover damage due to unauthorized  
repair, nor does it cover damage due to improper shipping  
by customer.  
Hafler will pay for the cost of returning the repaired or  
replacement product to you within the United States  
This warranty does not cover any appearance item, any  
accessories used in conjunction with the product, or any  
damage to the product resulting from the alterations, acci-  
dent, misuse or abuse.  
This warranty does not apply if the parts or labor, which  
would be otherwise provided without charge under this  
warranty, are obtained from any source other than Hafler  
or an authorized service center.  
Hafler limits its obligation under any implied warranties  
under state laws to a period not to exceed the warranty  
period.  
All product returned under warranty must be accompanied  
by a return authorization number. RA numbers may be  
obtained by phone at 602-967-3565. Defective product  
must then be sent prepaid to:  
H A F L E R  
613 South Rockford Drive  
Tempe, AZ 65261  
 
18  
Dear Hafler Owner,  
The gloss black insert on the face-plate of your new Hafler  
equipment has been packaged with a removable protec-  
tive coating. Please peel off this protective coating follow-  
ing installation.  
When cleaning the face plate, we advise a soft cotton cloth  
with a non-abrasive cleaner that is safe for Lexan and  
painted surfaces. DO NOT use paper towels or any coarse  
material to clean the face-plate as these materials may  
scratch the insert.  
We are sure you will enjoy your new Hafler product both  
sonically and cosmetically for years to come.  
The Hafler Team!  
 
19  

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