Precision Power Music Mixer MaxxBass User Manual

MaxxBass®  
 
CONGRATULATIONS  
Thank you for choosing PrecisionPowerTM audio equipment. At  
PrecisionPowerTM we proudly design, engineer and manufacture  
audio products for aftermarket car audio. Our award winning  
engineering team utilizes innovative technology to consistently  
deliver Absolutely State of the Art performance, sound quality,  
reliability, and value. This PrecisionPowerTM product reflects our  
commitment to offer you unparalleled versatility and quality for years  
of dependable service and listening enjoyment.  
SERVICE  
Do not attempt to service PrecisionPowerTM products yourself.  
Performing exploratory surgery on your audio equipment yourself  
will void the warranty. Many parts of your PrecisionPowerTM gear are  
custom built to our specifications. Our factory parts are not made  
available to anyone else nor are they for sale. Our goal is to make  
sure that your PrecisionPowerTM will always sound as good as the  
day it was purchased. Contact your authorized PrecisionPowerTM  
dealer about obtaining any warranty service through  
PrecisionPowerTM. (See Warranty on back cover).  
(Record listing for Model, Serial Number, and Purchase Date)  
Model _____________________  
Serial Number _______________  
Purchase Date _______________  
CAUTION  
The extended use of a high-powered audio system may result in  
hearing loss or damage. While PrecisionPowerTM systems are  
capable of "Concert Level" volumes with incredible accuracy, they  
are also designed for you to enjoy more reasonable levels all of the  
sonic subtleties created by musicians. Please observe all local  
sound ordinances.  
2
 
WHY USE MAXXBASS  
PrecisionPowerTM will introduce the first MaxxBass® processor to  
the automotive market. The MaxxBass® processor is ideal for  
improving the perceived bass response in door mounted speakers  
without upgrading the speakers or amplifiers.  
MaxxBass® provides subwoofer like performance with perceived  
bass response to 30-40Hz on door mounted speakers. The  
MaxxBass® Processor is recommended in two configurations.  
(Please see Wiring Configurations for more details.)  
1) Front Stereo Configuration  
One MaxxBass® Processor is used between the front channel  
source and front speaker amplifier to increase the bass response on  
only the front speakers. This is recommended to improve bass  
imaging in high performance systems with rear mounted  
subwoofers.  
2) Dual Stereo Configurations  
For systems without rear subwoofers, the user may prefer to use two  
MaxxBass® Processors, one for the front speakers and one for the  
rear speakers. Although not nearly as good bass performance as  
using a high performance subwoofer, this configuration will provide  
close to subwoofer like performance without the space requirements  
of a high performance subwoofer. This is a practical alternative for  
bass performance where a subwoofer system can not be added.  
WHY IS MAXXBASS BETTER  
MaxxBass® is NOT a bass boost technology. Bass boost  
technologies try to compensate for lack of bass frequency range by  
equalizing or increasing the relative volume of the frequencies near  
the speaker limit.  
This increases amplifier and speaker excursion limits, which  
can damage the system at high levels.  
This destroys the intended frequency balance of music.  
3
 
MaxxBass uses psychoacoustics to extend the perceived bass  
frequency response.  
It is proven to provide up to 1.5 octaves of increased bass  
range.  
It does not change the frequency balance of the music and  
sounds more natural than large bass boosts.  
It does not require more amplifier power and speaker  
excursion.  
It has been proven over many years of use in professional  
audio recording.  
WHAT IS MAXXBASS  
MaxxBass® is a patented technology, which extends the bass  
frequency range by allowing listeners to perceive bass frequencies  
more than an octave below the physical limitations of speakers  
systems. In cars MaxxBass® allows door mounted speakers that  
typically drop off below 70-100Hz to play down another octave or  
more.  
This is accomplished using the science of psychoacoustics on how  
we perceive sound. By building audio systems optimized for how we  
hear sound, significant performance improvements can be obtained.  
This is analogous to designing and building televisions that only  
display red, green and blue dots. When we view these displays our  
visual perception combines these dots to make a full color spectrum  
without needing to reproduce all the necessary color frequencies.  
Unlike other bass technologies MaxxBass® delivers more perceived  
bass while simultaneously reducing the likelihood of damaging  
speakers and amplifiers. MaxxBass® also delivers this extended  
bass without any perceived distortion. MaxxBass® technology has  
been used for years in mastering most of the world's most popular  
music.  
4
 
HOW DOES MAXXBASS WORK  
MaxxBass® uses advanced digital signal processing based on the  
proven psychoacoustic Phenomenon of the Missing Fundamental. A  
basic description and a MaxxBass® Signal Flow diagram are  
provided for interested users.  
MaxxBass® first implements a crossover at the MaxxBass®  
Frequency. The MaxxBass® Processor allows the choice of 60Hz,  
generally suggested for 6-6.5" drivers, and 80Hz suggested for 4-  
5.25" woofer drivers.  
The low pass filter (LPF) output of the crossover extracts the bass  
signal which is below the bass frequency response of the system.  
This is the signal to be reproduced psycho-acoustically and only this  
signal receives the MaxxBass® processing. It is significant to note  
that unlike bass boosts, MaxxBass® does not add or change the  
processing of higher frequencies that can be reproduced by the  
system. MaxxBass® does not change the artist's sound mix.  
MaxxBass® uses a patented digital signal processing algorithm to  
calculate precise harmonic content information which is added back  
into the LPF signal.The combined LPF and harmonics output is high  
pass filtered, thus removing the original bass signal. The processed  
signal is then added back into the original HPF signal and the final  
output provides a signal that sounds like the original, but no longer  
has un-reproducible low frequencies.  
5
 
MAXXBASS SIGNAL FLOW  
Cross-  
Over  
60/80 Hz  
Output  
Input  
HPF  
+
LPF  
LPF +  
Harmonics  
Input Signal Example  
MAXXBASS®  
HPF  
60/80 Hz  
Harmonics  
Processed Signal Example  
FEATURES  
Selectable MaxxBass® Frequency Setting of 60Hz and 80Hz  
Green LED clip/Red LED power indicator signal  
Gold 2 Channel in/2 channel buffered full-range out RCA  
connectors  
4-pin locking power plug  
Input connector for outboard MaxxBass® Intensity controller  
Remote and on-box intensity controls  
Intensity adjustment from 0 to full effect  
-18dB/octave high pass filter output at 60/80Hz  
Defeatable -24/dB octave low pass filter at 100Hz on the input  
6
 
SPECIFICATIONS  
Frequency  
20hz-20kHz  
Signal-to-Noise Ratio >85dB  
Separation  
65dB @ 1kHz  
Crossover Slope  
Input Impedance  
Input Sensitivity  
Output Level  
24dB/octave  
20,000 Ohms  
variable, 300mV to 3V peak to peak  
variable, 300mV to 5V peak to peak  
9 to 16 VDC  
Supply Voltage  
INSTALLATION/MOUNTING  
NOTE: As an option, before beginning, disconnect the  
negative (-) terminal of the battery to prevent an  
electrical short to ground. Reconnect the negative  
terminal only after all connections have been made.  
To prevent damage to the MaxxBass® Processor while driving,  
mount in a secure place. Choosing the appropriate location will  
depend upon your vehicle and the complexity of your system design.  
Typical mounting locations include the trunk and passenger  
compartment (floor or under seat). Never mount the MaxxBass®  
Processor in a location that would subject it to immersion or  
exposure to water.  
Once a location has been chosen, securely mount the MaxxBass®  
Processor with the four mounting screws. Be Careful! Inspect the  
area underneath to be sure you are not drilling into wires, brake or  
fuel lines, etc. that could be damaged by the drill bits or screws.  
7
 
MASSBASS OUTLINE AND DIMENSIONS  
5.90in  
(15cm)  
5.51in  
(14cm)  
INTENSITY  
OUTPUT  
INPUT  
POWER CLIP  
MIN MAX  
MIN MAX  
MIN MAX  
4.53in  
(11.5cm)  
2.48in  
(6.3cm)  
80Hz  
60Hz  
ON  
OFF  
FREQUENCY CROSSOVER  
GND REM +12V REM OUT  
1.18in  
(3cm)  
INPUT  
REMOTE  
OUTPUT  
POWER  
8
 
WIRING CONFIGURATIONS  
The MaxxBass® Processor is recommended in two different  
configurations.  
1. Front Stereo Configuration  
The figure below illustrates the wiring for a front stereo  
configuration. One MaxxBass® Processor is used between the front  
channel source and front speaker amplifier to increase the bass  
response only on the front speakers.  
Implementing MaxxBass® on the front speakers will increase the  
perceived bass response of these speakers down to 30-40Hz  
providing a Virtual Subwoofer. The listener will achieve better bass  
balance and imaging with a rear mounted subwoofer or trunk  
mounted speakers with sufficient bass response.  
Front speakers  
In-dash  
CD Receiver  
with Virtual  
RF  
LF  
SubwooferTM  
Front  
Rear  
Maxx  
Bass®  
LR  
RR  
Subwoofer  
Power  
Amplifiers  
9
 
2. Dual Stereo Configurations  
For systems without rear subwoofers, the user may prefer to use two  
MaxxBass® Processors, one for the front speakers and one for the  
rear speakers. The units should be wired between the in-dash CD  
Receiver and the power amplifiers as shown below.  
Front speakers  
In-dash  
with Virtual  
LF  
RF  
CD Receiver  
SubwooferTM  
Front  
Rear  
Rear speakers  
with Virtual  
Maxx  
Bass®  
Maxx  
Bass®  
RF  
RR  
SubwooferTM  
Power  
Amplifiers  
NOTE: As an option, before beginning, disconnect the  
negative (-) terminal of the battery to prevent an  
electrical short to ground. Reconnect the negative  
terminal only after all connections have been made.  
WIRING PROCEDURES  
The next step is to connect the Power, Ground, and Remote IN/OUT  
wires to your MaxxBass® Processor. The power wire should run  
from the mounting location through the vehicle to the battery or  
power distribution block. Avoid sharp corners, creases, and sharp  
body parts. When passing through any metal wall (i.e. firewall, etc.),  
a grommet must be used to prevent the wire from chafing and  
shorting to ground.  
10  
 
The ground wire should be of the same gauge wire as the power  
wire. As a rule of thumb, use as short length of wire as possible. Find  
a location near the MaxxBass® Processor that is metal ( the floor is  
ideal) and clean an area about the size of a quarter to bare metal.  
Drill a pilot hole in the middle of this area. Terminate the wire with a  
ring connector and attach it to the bare metal using a #8 sheet metal  
screw and washer (not supplied). We suggest crimping and/or  
soldering this connection. After the connection is complete, coat the  
area with silicone or some similar material to prevent rust from  
developing.  
Finally, the remote IN wire needs to connect to the "Amplifier  
Remote" lead of the head unit. This wire supplies a 12 volt signal to  
the MaxxBass® Processor when the main System is activated. The  
remote OUT wire is to be connected to the remote input of the  
source amplifier or to and "optional" relay to activate multiple  
amplifiers. Once you have routed the power, ground, and remote  
wires through the vehicle, it is time to connect the wires to the  
MaxxBass® Processor. Be sure that you have not reconnected the  
ground cable to the negative post of the battery.  
NOTE: Refer to the diagram of the system shown in  
MaxxBass® Outline and Dimensions for connection  
points.  
Cut off the excess wire and, using the wire strippers, strip the power,  
ground and remote cables about 1/8 inch. Locate the power, ground,  
and remote IN/OUT wires of the power plug (supplied). We again,  
suggest crimping and or soldering each connection separately to  
insure no damage to the unit or the audio system. Check that each  
connection is tight. If the wires are secure, the plug may be inserted  
into the MaxxBass® Processor.  
11  
 
INPUT  
To use Speaker Level Inputs (common ground head units only),  
connect RCA plugs to the front or rear speaker leads as shown.  
NOTE: It is important to connect an input signal to both  
RCA input jacks if a stereo amplifier is used, otherwise  
the connected channel receives full range and the  
disconnected channel will receive only the harmonics.  
Use a RCA female to dual male “Y” cord if mono input  
is used.  
Front speakers  
In-dash  
CD Receiver  
with Virtual  
RF  
LF  
SubwooferTM  
Front  
Rear  
Maxx  
Bass®  
LR  
RR  
Subwoofer  
Power  
Amplifiers  
WARNING: If you are using a source unit with bridged  
high powered (or "floating ground") speaker outputs, a  
suitable high to low level adapter must be used. If you  
are unsure about your head unit see your local  
PrecisionPowerTM dealer.  
12  
 
MAXXBASS PROCESSOR SETTINGS  
To achieve proper performance it is important to set or tune the  
settings on the MaxxBass® Processor to the final system. This  
section recommends initial settings and the users can then further  
adjust these for optimal listening.  
1. CROSSOVER: The CROSSOVER control implements a -  
24dB/octave low pass filter on the input. Set the CROSSOVER  
control to OFF if the amplifier and speakers after the MaxxBass®  
Processor are full range speakers or if passive crossovers are used  
in the speakers. Set the CROSSOVER control to ON, if the  
MaxxBass® Processor is only used on a woofer channel and  
separate amplifiers and speakers are provided for tweeters.  
2. FREQUENCY: The FREQUENCY control should be set to 60Hz  
for 6.5 inch door speakers and 80Hz for 5.25 to 4.0 inch door  
speakers.  
3. INPUT: The INPUT control is a signal attenuator for high voltage  
inputs. The CLIP LED can be used to help set the maximum input  
level setting prior to clipping. Start with INPUT control near MIN  
position and increase INPUT level until the Clip LED lights  
occasionally.  
4. OUTPUT: The OUTPUT control provides a linear gain on the  
output to help match signal levels to power amplifiers. Start with  
OUTPUT control near MIN position and adjust accordingly to match  
levels with other system components.  
5. INTENSITY: The INTENSITY control provides an input to the  
MaxxBass® algorithm on the level of the effect. Start with  
INTENSITY near MIN position and increase until the desired level of  
bass effect is obtained.  
The INTENSITY control on the MaxxBass® Processor and Remote  
Unit have identical functionality. At the MIN position on the  
INTENSITY control, the MaxxBass® algorithm is in bypass, so that  
no MaxxBass® processing occurs.  
13  
 
When the Remote INTENSITY control is plugged into the  
MaxxBass® Processor, the Remote INTENSITY control become  
active and the INTENSITY control on the MaxxBass® Processor is  
disabled.This allows the user to install a remote control in a location  
different than the MaxxBass® Processor and place in a more  
convenient position for the listener such as underneath the  
dashboard or in the glove compartment.  
The INTENSITY control on the MaxxBass® Processor system is  
only active when the Remote INTENSITY control is not plugged in.  
This control is provided for users, who do not wish to use the  
Remote INTENSITY control.  
TROUBLESHOOTING  
NO SOUND  
Is the POWER LED lit?  
YES  
NO  
Check Input cables for signal by Check power and remote  
Connecting them straight to the turn-on wire for voltage.  
Subwoofer amplifier.  
Make sure the ground wire is  
Secure.  
ANY SOUND NOW?  
YES  
NO  
Problem is in the Crossover.  
See your local Authorized  
PrecisionPowerTM Dealer.  
Problem is elsewhere in the  
system. Check head Unit and  
amplifiers.  
14  
 
SOUND IN ONE CHANNEL ONLY  
Reverse left and right RCA outputs for one band (i.e.-subwoofers)  
SOUND IS NOW IN  
OPPOSITE CHANNEL  
SAME CHANNEL  
Reverse RCA inputs  
Problem is in the amplifier,  
Speakers, or associated  
wiring of the silent channel.  
SOUND IS NOW IN  
OPPOSITE CHANNEL  
Reverse RCAs to head unit  
(Check Balance Control)  
SAME CHANNEL  
Problem is in the Crossover.  
See your local Authorized  
PrecisionPowerTM dealer.  
SOUND IS NOW IN  
OPPOSITE CHANNEL  
SAME CHANNEL  
Problem is in the head unit.  
Problem is in the RCA cables.  
LOW OUTPUT FROM ONE BAND  
Check crossover frequencies and check gain control on the effected  
amplifier(s).  
STILL LOW OUTPUT - See your local Authorized PrecisionPowerTM  
dealer.  
15  
 
LIMITED TWO YEAR CONSUMER WARRANTY:  
Directed Electronics, Inc. promises to the original purchaser, to replace this  
product should it prove to be defective in workmanship or material under normal  
use, for a period of two years from the date of purchase by the dealer as indicated  
by the date code marking of the product PROVIDED the product was installed by  
an authorized Directed dealer. During this two-year period, there will be no charge  
for this replacement PROVIDED the unit is returned to Directed, shipping pre-  
paid. If the unit is installed by anyone other than an authorized Directed dealer,  
the warranty period will be 1 year from the date of purchase by the dealer as  
indicated by the date code marking of the product. During this 1-year period there  
will be no charge for this replacement PROVIDED the unit is returned to Directed,  
shipping pre-paid.This warranty is non-transferable and does not apply to any unit  
that has been modified or used in a manner contrary to its intended purpose, and  
does not cover damage to the unit caused by installation or removal of the unit.  
This warranty is void if the product has been damaged by accident or  
unreasonable use, neglect, improper service or other causes not arising out of  
defects in materials or construction. ALL WARRANTIES INCLUDING BUT NOT  
LIMITED TO EXPRESS WARRANTY, IMPLIED WARRANTY, WARRANTY OF  
MERCHANTABILITY, FITNESS FOR PARTICULAR PURPOSE, AND  
WARRANTY OF NON-INFRINGEMENT OF INTELLECTUAL PROPERTY ARE  
EXPRESSLY EXCLUDED TO THE MAXIMUM EXTENT ALLOWED BY LAW,  
AND DIRECTED NEITHER ASSUMES NOR AUTHORIZES ANY PERSON TO  
ASSUME FOR IT ANY LIABILITY IN CONNECTION WITH THE SALE OF THE  
PRODUCT. DIRECTED HAS ABSOLUTELY NO LIABILITY FOR ANY AND ALL  
ACTS OF THIRD PARTIES INCLUDING ITS AUTHORIZED DEALERS OR  
INSTALLERS. Unit must be returned to Directed, postage pre-paid, with:  
consumer’s name, telephone number, and address, authorized dealer’s name and  
address, and product description. IN ORDER FOR THIS WARRANTY TO BE  
VALID, YOUR UNIT MUST BE SHIPPED WITH PROOF OF INSTALLATION BY  
AN AUTHORIZED DIRECTED DEALER. ALL UNITS RECEIVED BY DIRECTED  
FOR WARRANTY REPAIR WITHOUT PROOF OF DIRECTED DEALER  
INSTALLATION WILL BE COVERED BY THE LIMITED 1-YEAR PARTS AND  
LABOR WARRANTY. Note: This warranty does not cover labor costs for the  
removal and reinstallation of the unit. BY PURCHASING THIS PRODUCT, THE  
CONSUMER AGREES AND CONSENTS THAT ALL DISPUTES BETWEEN THE  
CONSUMER AND Directed SHALL BE RESOLVED IN ACCORDANCE WITH  
CALIFORNIA LAWS IN SAN DIEGO COUNTY, CALIFORNIA.  
© 2004 Directed Electronics, Inc. All rights reserved. G41830 01-04  
 

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