BBE SONIC MAXIMIZER 482 User manual

User Guide
and
Reference
Manual


i

1
Important Safeguards ……………………………………………………………………………………………………………i
BBE Process Explained …………………………………………………………………………………………………………1-2
Product Description ………………………………………………………………………………………………………………2
Applications ………………………………………………………………………………………………………………………2
Controls and Connections ………………………………………………………………………………………………………3
Specifications ………………………………………………………………………………………………………………………4
General Operation ………………………………………………………………………………………………………………4
Application Diagrams …………………………………………………………………………………………………………5-9
Service /Warranty / Maintenance ……………………………………………………………………………………………10
Calibration Procedures …………………………………………………………………………………………………………11
Schematic Diagrams…………………………………………………………………………………………………………12-15
Congratulations on your purchase of the BBE 482i Sonic Maximizer—a two channel signal processor
that will benefit any recording or sound reproduction system. You now own a very unique signal
processing device with no equal in the audio world. Whether you purchased the BBE 482i for your
home studio, P.A., DJ system, or instrument rack, you will find the 482i's rugged construction and
careful electronic design a welcome addition to your sonic arsenal.
Thank you for your purchase, and for the trust that you've placed in BBE. We are committed to
bringing you the finest products, with useful and unique features to serve your audio needs.
The BBE Process—"What it Is"
Loudspeakers have difficulty working with the electronic signals supplied by an amplifier. These difficulties cause such
major phase and amplitude distortion that the sound reproduced by speaker differs significantly from the sound
produced by the original source.
In the past, these problems proved unsolvable and were thus delegated to a position of secondary importance in audio
system design. However, phase and amplitude integrity is essential to accurate sound reproduction. Research shows
that the information which the listener translates into the recognizable characteristics of a live performance are
intimately tied into complex time and amplitude relationships between the fundamental and harmonic components
of a given musical note or sound. These relationships define a sound's “sound”.
When these complex relationships pass through a speaker, the proper order is lost. The higher frequencies are delayed.
A lower frequency may reach the listener's ear first or perhaps simultaneously with that of a higher frequency. In some
cases, the fundamental components may be so time-shifted that they reach the listener's ear ahead of some or all of
the harmonic components.
This change in the phase and amplitude relationship on the harmonic and fundamental frequencies is technically
called “envelope distortion.” The listener perceives this loss of sound integrity in the reproduced sound as "muddy"
and “smeared.” In the extreme, it can become difficult to tell the difference between musical instruments, for example,
an oboe and a clarinet.
BBE Sound, Inc. conducted extensive studies of numerous speaker systems over a ten year period. With this knowledge,
it became possible to identify the characteristics of an ideal speaker and to distill the corrections necessary to return
the fundamental and harmonic frequency structures to their correct order. While there are differences among various
speaker designs in the magnitude of their correction, the overall pattern of correction needed is remarkably consistent.
The BBE Process is so unique that 42 patents have been awarded by the U.S. Patent Office.
TABLE OF CONTENTS

Product Description
The BBE 482i is a dual channel, single rack space device for use in -l0dBu line level applications. For each channel there
are one pair of Lo Contour and Process knobs plus a 5 segment LED input level meter. A single function button
switches the BBE process on or off in both channels, which is useful for comparing the processed sound to the
unprocessed sound. An LED next to the function button glows green when the BBE process is on and red when the
process is off. The Lo Contour controls are for adjusting the level of phase corrected low frequencies in the program
material. The Process control is for adjusting the level of phase corrected high frequencies in the program material.
Things to Remember
The BBE 482i is designed to work with -l0dBu line levels. This is suitable for professional and semi-pro mixers, P.A.
consoles, recording studios, or D.J. equipment. The BBE 482i drives load impedances down to 1K Ohm and supplies a
maximum output level of +18dBu. Plugging a guitar or other high impedance device directly into the BBE 482i will
not work properly as its input impedance is less than 50K ohms.
Set-Up
The BBE 482i is connected into the chain in series with the signal path the same way a graphic equalizer or limiter
would be connected. The output of a mixer, pre-amp, or other sound source feeds the input of the BBE 482i. Setting
up the BBE 482i as an echo send device like a digital reverb is not recommended as the processed effect is not fully
realized when summed with the original source audio.
APPLICATIONS
Music and P.A. Systems
The BBE 482i is a welcome addition to any live sound P.A. system because the BBE circuit dramatically improves the
clarity and intelligibility of vocals and musical instruments. Night club and mobile DJ systems will also benefit greatly
from the BBE Process, with more depth, detail and punch over the entire mix. The 482i can be hooked up to any P.A.
or DJ sound system exactly like an equalizer would. When using in conjunction with an equalizer, the 482i should be
added after the equalizer in the signal chain. In the event that the equalizer is being used for drastic tone alteration,
then insert the 482i before the equalizer in the signal chain. Placement either before or after an equalizer should have
no negative effect on the 482i unit or its processing ability, however most users find they prefer more modest use of
their equalizers once the BBE 482i has been added to their sound systems.
Instrument Racks
The BBE 482i will deliver surprisingly good results in guitar, bass and keyboard rack systems. Electric guitars have added
“bite”, “chunk” and improved definition. As Guitar Player magazine said, “BBE is the most cost effective improvement
you can add to your rig”. Acoustic guitars processed with the 482i have a breathtakingly natural sparkle and presence.
Bassists will delight in the BBE 482i's ability to bring much more punch to the bottom end without muddying up the
midrange. The 482i is also great for keyboard rigs, with everything from the latest samples to a vintage Rhodes
benefiting equally from the patented BBE process.
Recording Systems
The BBE 482i can be used as an effect on individual tracks or applied overall during mixdown. The BBE process works
very well to liven up the final mix, which is why the BBE 482i and 882 models are popular for use in both recreational
and professional recording studios.
2
WWAARRNNIINNGG!!To prevent possible speaker or amplifier damage, always
power-up peripheral devices first, wait 10 seconds, and then turn on the power
amplifier. Turn off power amplifier first, then power-down peripheral devices.

1. LED DISPLAY: The LED display is used to indicate the output signal level of the BBE 482i. Each number on the
front panel corresponds to the output signal level, measured in decibels. Example: The “0” indicates a 0dBu signal
level, “-6” refers to -6dBu, and so on. Once an input signal level has been established, increasing the BBE PROCESS
and LO CONTOUR will increase the output signal and cause more LEDs to illuminate. The Clip LED monitors the
input signal level. The Clip LED will illuminate at +15dBu, giving a 3dBu warning of the impending distortion at
+18dBu, the actual clip point.
2. LO CONTOUR: Regulates the amount of phase corrected bass frequencies.
3. PROCESS: Regulates the amount of phase corrected treble frequencies.
4. BBE FUNCTION: This push button switch allows for quick comparison of processed with unprocessed sound.
When the switch is pushed in, the process is on and the indicator LED is green. When the switch is out, the process
is off and the indicator LED is red.
5. POWER: This switch controls primary power to the BBE 482i.
REAR PANEL CONNECTIONS
1. AC POWER CORD: Plugs into AC power receptacle. U.S. Model, 100-120Vac, 50/60Hz.
All other models,20~240Vac, 50/60Hz.
2. FUSE: Turn cap on fuse holder counter-clockwise to remove fuse. (Note: For U.S. Model, replace with 250Vac, 1/2A
Fastblow type fuse. For all other models, replace with 250Vac, .125A Fastblow type fuse.)
3. OUTPUT: The output of the BBE 482i can be taken from the 1/4” Phone Jack or the RCA Jack. Both are unbalanced
and are the same point electronically. This allows both outputs to be used simultaneously, eliminating the need for
a “Y” cord in the event multiple outputs are required. The recommended single load impedance is at least 10k
Ohms. If both outputs are being used, a minimum of a 22k Ohm load per device is required. (The “load” is
determined by the input impedance of the next subsequent component in the signal chain.) The maximum output
is rated at +18dBu. The output impedance of the BBE 482i is 1 k ohms. NOTE: Actual output level will vary due to
the selected position of the BBE Process, and the actual input signal level.
4. INPUT: The input of the BBE 482i is an unbalanced connection. Although is can be either a 1/4” Phone Plug or an
RCA Plug, it is recommended that only one input source is used. Both jacks are the same point electronically,
however, due to the input/output impedance characteristics of most audio devices, a loss of signal may occur and/or
damage to a component if both inputs are utilized. The input impedance of th BBE 482i is 47k Ohms. The maximum
signal level is +18dBu.
5. CHANNEL A: These connections function the same as CHANNEL B.
3
FRONT PANEL CONTROLS
1
1
2
2
3
3
4
4 5
5
CALIFORNIA USA
MODEL 482i
US PATENT
NO 4,482i,866
AND OTHERS

Specifications
Frequency Response,
process mode:……………………………Program controlled
bypass mode: ……………………………10Hz to 50kHz +/-0.5dBu, -10dBu input
THD, process mode:……………………………less than 0.025% at -10dBu input, 20-20kHz
bypass mode: ……………………………less than 0.002% at -l0dBu input, 20-20kHz
Maximum Output: ………………………………+18dBu (may vary due to control settings)
Input Impedance: ………………………………47k Ohms, unbalanced 1/4
" phone jack or RCA jack
Output Impedance: ……………………………1 k Ohms, unbalanced 1/4
" phone jack or RCA jack
Sensitivity: …………………………………………-45dBu for maximum process
Maximum Process: ………………………………+12dBu boost at 5kHz, -l0dBu input
Lo Contour: ………………………………………+12dBu boost at 50Hz, -l0dBu input
* 0dBu = 0.775Vrms
Power Requirements: ……………………………U.S., Canada 8 Japan models: 120VAC, 50/60Hz, 8 WATTS
Standard model: 220VAC, 50/60Hz, 8 WATTS
Fuse: ………………………………………………Replace with the same type FASTBLOW fuse
U.S., Canada & Japan models: 250Vac, 1 /2A Fast blow type fuse.
Standard model: 250Vac, .125A Fastblow type fuse
Dimensions: …………………………………...... 19
" (W) x 5.5 " (D) x 1.7 " (H)
Shipping Weight: ………………………………6.5 lbs.
Note: Due to continuing product improvement, specifications and design are subject to change without notice.
General Operation
THE BBE 482i IS A LINE LEVEL SIGNAL PROCESSOR AND IS TO BE CONNECTED PRIOR TO
THE POWER AMP IN ANY AUDIO SYSTEM. SIGNIFICANT DAMAGE MAY BE INFLICTED TO
THE BBE 482i OR ANY SUBSEQUENT COMPONENT IN THE SYSTEM IN THE EVENT THE
OUTPUT OF A POWER AMP IS CONNECTED DIRECTLY TO THE INPUT OF THE BBE 482i.
In order to reduce the risk of damage to any equipment, properly connect all cables and power cables before
turning on any components in the system. Most important of all, ALWAYS TURN ON THE POWER AMPLIFIER
LAST TO AVOID DAMAGING THE SPEAKERS OR THE AMP.
The BBE 482i may be utilized in a number of different environments and its results may vary accordingly.
Because both channels are completely independent from each other, only one channel of the BBE 482i may be
used, or each channel processing a different signal source. The effects loop is the ideal placement in the signal
chain of a guitar application. In a pre-amp, keyboard or P.A. application, the BBE 482i works best as the last
component in the signal chain, just before the crossover or power amp. Important: In a P.A. application, never
connect the BBE 482i into the effects loop. The inherent phase shift of the BBE Process will cause phase
cancellation resulting in a partial loss of signal.
BBE and Equalization
The most common question asked of the BBE Sound, Inc. service department is: “Where does the BBE Processor
connect in the signal chain, before or after the equalizer?” Many people find that the same amount of
equalization is no longer needed, if at all, when a BBE processor is used. Additionally, the amount of equalization
used will help determine the BBE 482i’s proper location in the signal chain: If the EQ is being set to give the
room a flat response as determined by a spectrum analyzer, the BBE 482i will work properly before or after the
EQ. (Placing the BBE 482i after the EQ is recommended.) If the EQ is being used for drastic tone alteration, the
recommended placement would be before the EQ. Neither of these configurations will harm the BBE 482i.
4

LIVE APPLICATION: NON-POWERED MIXER
5
Connect the BBE 482i to the output of the mixing console. The output of the BBE will drive
either a crossover or a power amplifier directly.
MICROPHONES
PA CABINET PA CABINET
POWER
AMPLIFIER
KEYBOARD
MIXING CONSOLE
BBE 482i SONIC MAXIMIZER
CASSETTE DECK
CALIFORNIA USA
MODEL 482i
US PATENT
NO 4,482i,866
AND OTHERS

LIVE APPLICATION: POWERED MIXER
6
There are a couple of ways to configure the BBE 482i into a powered mixer. The ideal method
would be into “Pre-Amp Out/Power Amp In” section of the console. If your console does not
have this option, use the main or channel insert points.
PA CABINET
PA CABINET
MIXING CONSOLE
MIXING CONSOLE
BBE 482i SONIC MAXIMIZER
BBE 482i SONIC MAXIMIZER
CALIFORNIA USA
MODEL 482i
US PATENT
NO 4,482i,866
AND OTHERS
CALIFORNIA USA
MODEL 482i
US PATENT
NO 4,482i,866
AND OTHERS

RECORDING
MASTERING OR DUBBING
7
Use the BBE 482i for mastering the recording. Even if the BBE Process has been used on individual
tracks, an improvement on the total mix will be noticed.
The BBE 482i can be utilized in the recording studio on individual instruments of on groups on
instruments to improve the sound quality.
MIXING CONSOLE
MIXING CONSOLE
BBE 482i SONIC MAXIMIZER
MULTITRACK RECORDER
MULTITRACK RECORDER
MASTERING DECK
BBE 482i SONIC MAXIMIZER
KEYBOARD
CALIFORNIA USA
MODEL 482i
US PATENT
NO 4,482i,866
AND OTHERS
CALIFORNIA USA
MODEL 482i
US PATENT
NO 4,482i,866
AND OTHERS

INDIVIDUAL INSTRUMENTS
8
Use the BBE 482i in the effects loop or the main output of a guitar preamp. For keyboards, the
output of the sub-mixer will be the ideal location.
POWER AMP
4 X 12” CAB 4 X 12” CAB
BBE 482i SONIC MAXIMIZER
GUITAR PREAMP
CALIFORNIA USA
MODEL 482i
US PATENT
NO 4,482i,866
AND OTHERS

9
SOUND CONTRACTORS
DJ APPLICATION
Connect the BBE 482i into the processor loop of a pre-amplifier/mixer and hear the music come alive!
The BBE 482i will accept the output level of most sound contractor type mixers.
SPEAKERS
SPEAKERS
POWER AMPLIFIER
POWER AMPLIFIER
MIC AMPLIFIER
BBE 482i SONIC MAXIMIZER
BBE 482i SONIC MAXIMIZER
DJ MIXER
MAIN
OUT
PROCESSOR OUT
PROCESSOR IN
CALIFORNIA USA
MODEL 482i
US PATENT
NO 4,482i,866
AND OTHERS
CALIFORNIA USA
MODEL 482i
US PATENT
NO 4,482i,866
AND OTHERS

Service
We recommend that if at all possible, a BBE 482i which requires service be sent to our facility in Huntington Beach,
California. We request that a “RETURN AUTHORIZATION” be issued by the dealer from whom you purchased the unit.
If this is not possible, call BBE Sound, Inc. directly at [phone], extension 116 to obtain a “RETURN
AUTHORIZATION”. Include a copy of the bill of sale with the unit when it is shipped to BBE Sound, Inc. so that the
service can be expedited.
As the repair turnaround time is minimal, we request that the unit be sent to BBE Sound, Inc. We also need to add
reliability data to our files so that future revision may be undertaken, if necessary, to improve the product. If unit has
been purchased outside the US, please contact your national distributor.
Warranty
Warranty registration of the unit to BBE Sound, Inc. is not necessary. It is strongly recommended that you retain a copy
of the bill of sale for future reference.
IT IS THE SOLE RESPONSIBILITY OF THE END USER TO PROVIDE THE BILL OF SALE OR
OTHER MEANS OF PROOF OF PURCHASE TO VALIDATE THE WARRANTY IF WARRANTY
SERVICE IS REQUESTED.
The BBE 482i is warranted against defects in material and workmanship for a period of five (5) years from date of
purchase from BBE Sound Inc. or from an authorized dealer. During this period, we will repair units free of charge
providing that they are shipped prepaid to BBE Sound, Inc., 5381 Production Drive, Huntington Beach, CA 92649. We
will pay return UPS shipping charges within the USA. All charges related to non-UPS shipping, including customs
clearance, will be billed. The warranty will be honored for the longer of either 90 days from the date of any service or
the remainder of the original 5 Year factory warranty.
This warranty will be consider null and void by BBE Sound, Inc. if any of the following is found:
1. The equipment has been physically damaged.
2. The equipment shows signs of abuse.
3. The equipment has been electrically damaged by improper connection or attempted repair
by the customer or a third party.
4. The equipment has been modified without authorization.
5. The bill of sales indicates that the purchase date of the equipment is not within the warranty period.
All non-warranty repairs are warranted for a period of 90 days from the date of service.
BBE Sound, Inc. is NOT LIABLE FOR CONSEQUENTIAL DAMAGES. Should the unit fail to operate for any reason, our
sole obligation is to repair it as described above. DO NOT RETURN ANY PRODUCT TO THE ABOVE ADDRESS
WITHOUT INSTRUCTIONS AND AUTHORIZATION ISSUED BY THE ABOVE LOCATION.
Maintenance
Maintenance of the BBE 482i is limited to proper cleaning of the unit with mild household cleaner such as Formula
409™ or Windex™. The chassis and cover are steel finished with a durable polyurethane paint, while the front panel
is an anodized aluminum extrusion.
There are no user replaceable parts and the unit should not be opened for any reason unless you are a qualified
technician. Calibration should be performed if parts are replaced or if a performance check-out indicates a problem
with calibration. Long term use has shown that over the life of this unit there is little or no drift of the components
in the BBE 482i which would cause a change in calibration. A very conservative design philosophy has resulted in a
piece of equipment which runs very cool and should give years of trouble-free service.
10

Calibration Procedure for the BBE 482i (REV/S/ON 1.1)
NOTE: THIS UNIT WAS TESTED AND CALIBRATED AT THE FACTORY.
THIS PROCEDURE IS FOR QUALIFIED PERSONNEL ONLY.
INITIAL SETTINGS:
1. BBE Process controls VR1 and VR3 to minimum.(C.C.W.)
2. Lo Contour controls VR2 and VR4 to minimum.(C.C.W.)
3. Power switch “ON” and BBE function switch “IN”.
POWER SUPPLY TEST:
1. With DVM set to DC volts, measure the positive end of C27. You should read less than +30vdc.
2. With DVM set to DC volts, measure the negative end of C29. You should read less than -30vdc.
3. With DVM set to DC volts, measure the voltage on JMP5. Reading should be +15vdc, (+/-0.5vdc).
4. With DVM set to DC volts, measure the voltage on JMP4. Reading should be -15vdc, (+/-0.5vdc).
BBE PROCESS TEST:
1. Input a 5khz signal @ -l0dBu into channel A [B] input.
2. With DVM set to AC volts, measure the channel A [B] output.
3. With Process control at minimum (C.C.W.) DVM should read -11.5dBu (+/-1dBu).
4. With Process control at maximum (C.W.) DVM should read +2dBu (+/-1dBu).
LO CONTOUR TEST:
1. Input a 50hz signal @ -l0dBu into channel A [B] input.
2. With DVM set to AC volts, measure the channel A [B] output.
3. With Lo Contour control at minimum (C.C.W.) DVM should read -11dBu (+/-1dBu).
4. With Lo Contour control at maximum (C.W.) DVM should read +3dBu (+/-1dBu).
BYPASS TEST:
1. Input a 500hz signal @ -l0dBu into channel A [B] input.
2. With DVM set to AC volts, measure the channel A [B] output.
3. With the process “IN”, DVM should read -9dBu (+/-1dBu) and the Process “IN” LED should be on.
4. With the Process “OUT”, DVM should read -11dBu (+/-1dBu) and the Process “OUT” LED should be on.
LED TEST:
1. Input a 5khz signal @ -20dBu into the channel A [B] input. The yellow -20 LED should light.
2. Change input level to -l0dBu. The yellow -12dBu LED should light.
3. Change input level to -5dBu. The green -6dBu LED should light.
4. Change input level to 0dBu. The green 0 LED should light.
5. Change input level to +18dBu. The red clip LED should light.
END TEST.
5381 Production Drive
Huntington Beach, CA 92649
[phone]
11

12

13

14

15

5381 Production Drive
Huntington Beach, CA 92649
714-897-6766 • FAX [phone]
www.bbesound.com
covered by U.S. Patent 4,482,866 and other U.S. and foreign patents pending.
BBE is the registered trademark of BBE Sound, Inc.

rev. 1 5/02