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D-Bass Amplifier

Q.What new technologies were incorporated into the D-BASS amplifier series to obtain high-quality sound?

A.The D-BASS series amplifiers incorporate the following circuit structures and new technologies to obtain high-quality bass sound.

  1. High-power, multi-amp configuration
    The D-BASS features a multi-amp configuration, with each speaker driven by its own dedicated power amp (the D-BASS 210 is a three-amp system, and the D-BASS 115/115X is a two-amp system). Digital signal processing is used to optimize the frequency response, allowing each amp to drive its speaker in the optimal frequency range.

  2. D-Class power engine and switching power supply
    A new D-Class power engine (developed specifically for bass) provides stable performance under any condition. In addition to delivering ideal bass sound, use of D-Class amp circuitry and switching power supplies provide high-efficiency energy conversion that reduces the generation of unnecessary heat. This allows for the use of small, lightweight power transformers and heat sinks, thus reducing the total amplifier weight.

  3. Newly designed lightweight speakers
    Roland has developed custom speakers with new materials for the D-BASS amplifiers, overturning the conventional wisdom that bass speakers have to be heavy to produce quality sound. The new design cuts the weight of previous models by one-half for the 10" speakers (D-BASS 210) and one-third for the 15" speaker (D-BASS 115). In addition, the new speakers incorporate stronger magnets than previous designs, resulting in quick response and effective low-frequency damping.

  4. Advanced FFP technology with Active Speaker Control
    D-BASS amplifiers incorporate Roland's proprietary FFP (Feed Forward Processing) technology. This system control technology optimizes the performance of the amp, speakers, and cabinet characteristics according to the signals being input, allowing for dynamic and powerful sound quality.

    Active Speaker Control uses an infrared sensor (built into the low frequency speaker unit) to monitor the actual movement of the speaker in realtime. Based upon this data, digital signal processing is applied to adjust for any discrepancy between the incoming bass sound and the operation of the speaker. This cancels unwanted speaker vibrations, ensuring faithful reproduction of the input signal.

    Active Speaker Control provides the following benefits for achieving superior bass sound:
    • Speaker amplitude linearity is improved, sharpening the sound and improving the response and "feel" of the amp. In particular, the lowest strings on extended-range basses are reproduced with great clarity.
    • The speaker's frequency range is extended to lower frequencies, expanding the number of extra-low notes you can play.

      Related FAQ: What is the FFP technology used in Roland's bass amps?

  5. Newly developed COSM preamps
    The D-BASS incorporates three types of newly developed COSM preamps: MODERN, VINTAGE, and SUPER FLAT.


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