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Introduction
Main Features
FFP Technology ..................................
Equipped with a digital signal processor (DSP), the DB-900 is
a bass amp that utilizes FFP technology for both superior
performance and high power.
The entire amp systems acoustic dynamic range is
expanded, providing dynamic, powerful sound with
output power exceeding spec figures.
The cabinets acoustic characteristics are improved for a
flat response extending into the low end, enhancing the
sound quality of the bass amp system as a whole.
Speaker amplitude linearity is improved, resulting in
superb fidelity to input for clean, clear sound.
COSM Technology ..............................
The amplifier section models a variety of amps sonic
characteristics, with different tones based on differences in
amp configuration and circuitry, providing a range of
sounds, from a high-response, wide-range sound to tube-
amp overdrive.
Passive Radiator ................................
By combining the use of FFP technology with passive
radiators at both left and right sides, the DB-900 is able to
provide sound covering the full bass range, including the
critical ultra-low frequency rangewithout super-woofers!
D-Chorus............................................
This amp features a newly developed D-chorus that has been
specially tuned for bass. Dynamic band-division processing
is performed as appropriate for the input signal, to produce a
great chorus effect that does not impair the low-frequency
response even when you use slap playing techniques or
when you play harmonics.
Memory Storage Feature....................
You can store the settings for controls in memory A or
memory B (Memory feature). Its also possible to call up the
contents of memory with a foot switch. This means you can
also change amp settings quickly during live performances.
3-Band Equalizer................................
The DB-900 is equipped with a three-band equalizer
featuring a parametric MIDDLE equalizer, which allows you
to create a wide variety of different sounds. Moreover, when
combined with the Shape switch, even more tonal variations
are possible.
Broad Expandability ..........................
The input and output connectors include a headphones jack
with optimized tonal correction, a high-performance XLR-
type DI connector, two types of Line Out jacks (an XLR type
and a balanced phone jack), and convenient Insert jacks for
connecting external effects units or other equipment, thus
providing support for a wide variety of applications.
MEMO
What’s FFP (Feed Forward Processing) Technology?
FFP is system control technology that optimizes the
performance of the amp, speakers, and cabinet characteristics
according to the signals being input, based on results of
analyses of the operation and behavior of each section of
existing amp systems.
MEMO
What’s COSM (Composite Object Sound Modeling)
Technology?
Technology that uses different means to create a virtual
reconstruction of physical structures, materials, and so on
that actually exist is called modeling technology. COSM is
proprietary technology from Roland that combines several
kinds of sound-modeling technology to create even newer
sounds.
Before You Use the DB-900
The factory-default control settings are stored in memory A and
memory B (p. 14). When you switch on the power for the first
time after purchase, the sounds play according to the settings in
memory A, regardless of the present control settings.
After that, starting with the next time you turn on the
power, sounds are played with the settings in effect
when the power was last switched off. For instance, if
you turn off the power while the settings in memory A
are in effect, sounds are played using the settings in
memory A the next time you turn on the power.
To Use the DB-900 Like a
Conventional Bass Amp
When you want to operate the DB-900 like a regular bass
amp, whereby settings are controlled directly with the knobs,
press the
MANUAL
button, illuminating its indicator.
NOTE
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