Roland 115 - Manual (Page 8)

8
Main Features
The D-BASS 210 and 115 are powerful yet lightweight professional bass amps, which utilize Roland’s FFP technology
incorporating new Active Speaker Control. The D-BASS 115X is a powered extension speaker.
Stacking the D-BASS 210/115 and the D-BASS 115X lets you create an even more powerful system.
D-BASS 210/115/115X Shared Features
■ High-Power, Multi-Amp Configuration................................................................
The D-BASS features a multi-amp arrangement with each speaker unit driven by its own dedicated power amp. Combined with
signal processing optimized for each unit’s particular frequency response, this drives each of the speakers in the ideal manner.
■ Thorough Weight Reduction ...............................................................................
• Newly developed custom speakers make use of new
materials, succeeding in cutting the weight of previous
models by half for the 10” speaker and one-third for the
15” speaker (as compared with previous Roland
products). Moreover, stronger magnetic force ensures
quick response with effective damping in the lower
frequencies.
• Use of D-Class power amps and switching power
supplies for high energy conversion efficiency reduces
generation of unnecessary heat. This permits use of
smaller, lighter power transformers and heat sinks.
• New cabinet designs make use of new materials and
reduce unwanted vibration, resulting in cabinets that are
lighter overall, yet still ensure ample ruggedness.
■ Advanced FFP Technology Incorporating Active Speaker Control.........................
• These units employ Roland’s proprietary FFP amp
technology for dynamic, powerful sound that exceeds
specs, while D-BASS’s incorporation of Active Speaker
Control technology realizes even higher quality sound.
• Active Speaker Control uses an optical sensor to monitor
the movement of the speaker and correct discrepancies
between the original sound and the speaker motion. This
results in faithful reproduction of the Instrument's
original sound characteristics and the nuances produced
in performance.
FFP (Feed Forward Processing) is system control
technology that optimizes the performance of the amp,
speakers, and cabinet characteristics according to the signals
being input, based on the results of analyses of the operation
and behavior of each section of existing amp systems.
D-BASS 210 D-BASS 115 D-BASS 115X
Speaker Configuration 25 cm (10 inches) x 2 + Tweeter 38 cm (15 inches) + Tweeter 38 cm (15 inches) + Tweeter
Power Amp Configuration 160 W x 2 + 80 W (Tweeter) 250 W + 80 W (Tweeter) 250 W + 80 W (Tweeter)
Total Output Power 400 W 330 W 330 W
Conceptual Diagram of Active Speaker Control
Preamp
Speaker
Power Amp
Optical Sensor
Control
Input
FFP
Speaker motion
monitored
● Conventional Bass Amps
With conventional bass amps, input signals are amplified by the
power amp, and then the sound is output by means of the
vibration of the speaker, but discrepancies occur between the
signals output from the power amp and the actual vibration of
the speaker. Observations of speaker motion when bass sounds
are played reveal delayed response in the attack and release and
superfluous vibration. Such discrepancies stem from the basic
mechanical properties of the cone speaker construction, and are
especially noticeable in the low-frequency range. These
discrepancies result in a loss of clarity and definition in the bass
sound.
● How Active Speaker Control Works
With Active Speaker Control, the speaker movement is
monitored in real time with an optical sensor to detect any
deviation from the input signal. Any such discrepancies are
corrected by a digital signal processor, thus controlling speaker
motion to reproduce the input signal as closely as possible.
● Effect of Active Speaker Control
Active Speaker Control affects the actual bass sound in the
following ways.
• Speaker amplitude linearity is improved, producing a
tight, powerful sound with better contour. In particular,
this technology provides faithful reproduction of the low
end for basses with Low-B string.
• This allows the range of frequencies reproduced to be
extended further in the low end, expanding the frequency
range of the bass sound.
• The speakers are drives in a way that creates a sound truer
to the input signal, providing with greater responsiveness.
Active Speaker Control
115X
210/115