Amplifier with DSP processor Nakamichi FDSK230A Pro
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Amplifier with DSP Processor Nakamichi FDSK230A Pro
Nakamichi FDSK230A Pro is a compact 4-channel amplifier with an integrated DSP processor, combining powerful analog output with extensive digital settings. It offers 4 x 35 W RMS power and supports a variety of input signals – from RCA and high-level input to AUX and optical input, as well as built-in and external Bluetooth connectivity or USB music playback. This makes the device extremely flexible and easily integrable into both factory and aftermarket systems. All channels are also output as line RCA outputs, meaning the device can also be used as a standalone DSP processor – an ideal solution when combined with external amplifiers with higher power. For more comfortable control, an external Nakamichi AC6 controller can be purchased.
Fidela - Nakamichi's Premium Line
Fidela represents the highest class from Nakamichi, combining the brand's rich history with modern technologies and precise craftsmanship. Originally associated with high-end tape recorders in the 1960s, known for their innovative mechanics and unmatched sound. Today, the Fidela brand focuses on car amplifiers and DSP processors, utilizing top components for maximum sound quality. Key features of Fidela amplifiers include, besides the use of high-quality components, perfect craftsmanship and premium design. These features make Fidela amplifiers an ideal choice for demanding users seeking high sound quality and extensive customization options in the automotive environment.
Integrated 8-Channel DSP Processor
Inside the device, we find quality components such as WIMA and ELNA capacitors, OPA1678 operational amplifiers, and Toshiba microchips operating in class AB. The DSP processor is based on the AK7735 chip from Asahi Kasei, with high-quality PCM3168 circuits handling the digital-to-analog conversion. The DSP offers a 31-band equalizer for each channel with 1 Hz resolution, time delay up to 25 ms, phase control, and a selection of professional crossover types like Butterworth, Bessel, or Linkwitz-Riley. The output signal is fully tunable, including gain and Q value settings. There is a stable and extensive software for tuning on a computer, as well as an intuitive mobile app for phone settings. With low distortion (≤0.05%) and high signal-to-noise ratio (≥98 dB), the resulting sound is precise and faithful, suitable even for demanding installations.
Main Features
- 4-channel amplifier with 4 x 35 W RMS power.
- Can be used as a standalone DSP processor thanks to line RCA outputs on all channels.
- Support for all input types: RCA, high-level, Bluetooth (internal and external), USB, AUX, optical.
- DSP processor AK7735 with DAC/ADC PCM3168, OPA1678 operational amplifiers.
- Internal components WIMA, ELNA, and Toshiba in class AB.
- 31-band EQ for each channel, time delay up to 25 ms, phase control.
- Professional crossovers: Butterworth, Bessel, Linkwitz-Riley.
- Output voltage up to 5.6 V RMS, tunable gain 0 to +6 dB.
- USB playback support: MP3, WAV, FLAC.
- Stable tuning software + mobile app for iOS/Android.
- Option to purchase an external Nakamichi AC6 controller.
- Compact dimensions 176 × 151.5 × 48 mm.
About Nakamichi
The history of the Nakamichi brand dates back to 1948 when it was founded in Japan by Etsuro Nakamichi. His journey to fulfill his dreams began with the establishment of the small research institute Nakamichi Research Corporation in Tokyo, Japan, which conducted research on sonars and magnets and developed for major brands, government entities, universities, and organizations. Since then, it has established itself as a trusted creator of high-quality products resulting from intense scientific work, a passion for sound, and a commitment to uncompromising quality and performance. In 1972, Takeshi Nakamichi joined Nakamichi Corporation, closely linked with the company's expansion and deeply involved in all legendary Nakamichi audio products sold in Asia, America, and Europe, including the first launch of the Nakamichi 1000, the world's first cassette deck. He was considered one of the world's best acoustic and sound engineers, able to combine top-notch sound with the advantages of Koza Kobayashi's brilliant audio product design, the brand's chief engineer at the time. The amplifiers, players, and car radios of that era are now considered legends, but the Nakamichi brand remains successful today, producing products in home and vehicle sound systems. The manufacturer's cleverly thought-out portfolio continues to grow, and all products catch attention with an interesting price-to-quality ratio. Particularly the higher model lines strive to build on Etsuro Nakamichi's legacy, whose name still reflects in the brand's products today.
| Catalog number | FDSK230A PRO |
| Brand | Nakamichi |
| Links | Official web presentation |
| Energy class of the amplifierAmplifiers are divided into two basic classes: analog and digital . Analog amplifiers (A/B) have higher consumption requirements, but usually have a more natural sound. Digital amplifiers (D) have significantly lower consumption and higher efficiency, but the sound may not be as faithful as with classic analog amplifiers. | D |
| Number of amplifier channelsAmplifiers are divided into: - Monoblocks - 2-channel - 3-channel - 4-channel - 5-channel - 6-channel - multi-channel Each channel is used to power one speaker for the coaxial type, or one side if they are component speakers. Monoblock type amplifiers are mainly used for subwoofers. 2-channel are suitable for both subwoofers and, for example, the front pair of speakers in a car. 3-channel is used for front or rear speakers + subwoofer. 4-channel are used for front + rear speakers or 1 pair of speakers + subwoofer. 6 or 5-channel are used for 2 pairs of speakers + subwoofer, most often. Bridging means connecting the amplifier to a bridge, using the + pole from one channel and the - pole from the other channel. In most cases this is shown as "BRIDGED" on the amplifier. | 4 |
| RMS power into 4 ΩRMS power when loading speakers or subwoofer at 4 Ω. RMS power is the constant power of the amplifier and is one of the most important parameters when choosing an amplifier. | 4 x 35 W |
| Frequency rangeThe ability of the amplifier to reproduce the signal from the lowest frequency to the highest = faithfully reproduce the sound in a specific frequency band. Professionally: In the frequency range from 40 to 16,000 Hz, the vast majority of fundamental and overtones (harmonics) of all musical instruments are found. We are interested in the course of the radiated sound pressure in this range of frequencies when the loudspeaker system is supplied with constant power. We call this course the frequency characteristic, which tells us the level of radiated sound pressure in decibels (dB) depending on the frequency. The frequency characteristic of a speaker or speaker system can be expressed most succinctly with a graph. Mostly, however, the frequency characteristic is indicated by indicating the maximum tolerance of the sound pressure in the given frequency range, e.g. 50 to 15,000 Hz -+ 6 dB. Since the frequency characteristics of loudspeakers and systems in general are quite uneven, some manufacturers do not even specify this maximum tolerance of sound pressure in decibels in their catalogs for reasons of prestige. Data impoverished in this way is unfortunately worthless. What is valid is that the manufacturer offers a speaker system with a frequency range of 30 to 20,000 Hz, if he is worried about stating the maximum unevenness of the sound pressure in this range, because he can have a tolerance of, for example, +- 20 dB. The unevenness or undulation of the frequency curve in good speaker systems for high-quality music performance should not exceed +-3 dB in the 80 to 12,000 Hz band and +-6 dB in the 40 to 16,000 Hz band. Greater unevenness already depletes or emphasizes certain tonal areas, which can cause audible or even disturbing distortion. The proportion between fundamental tones and higher harmonics also changes, thereby changing the color of the sound, and individual musical instruments as well as the entire musical image sound unnatural. | 20 - 20000 Hz |
| Harmonic Distortion (THD)Total harmonic distortion indicates how much the input signal is distorted in the amplifier. Distortions appear as overtones contained in the output signal. The proportion of originally absent parts of the signal is given as a percentage, typical values are between 0.001% and 0.5%. Distortion is measured in their power band. If it exceeds the limit of 0.7% from a certain power, it is the value of the output power of the given amplifier, from which it no longer plays without distortion and from which the distortion usually increases steeply, so that no further increase in power can be counted on. The lower the value, the better. | < 0.05% |
| Signal-to-noise ratioThe signal-to-noise ratio means that the output signal always contains noise. The signal-to-noise ratio expresses how much of this noise is compared to the useful signal. The so-called A value is given, which does not take deep and very high frequencies into account. This corresponds to the characteristic of human hearing, which is not so sensitive to deep frequencies, especially below 1 kHz. The higher the value, the better the amplifier is. | > 98 dB |
| Power supply | DC 6.7 V - 18 V |
| Standby power consumption | < 0.1 W |
| High level inputsThe high-level input on the amplifier allows connection directly to the existing speakers in the car without additional purchase of an external high/low adapter. Important equipment in the case of installing an amplifier on an original car radio. | Yes |
| Automatic on and offThis function allows you to automatically switch on the amplifier. | Yes |
| Integrated DSP processor | Yes |
| Number of DSP processor channels | 8 |
| Input for wired remote controlIf the amplifier has a remote control input. | Yes - Nakamichi AC6 |
| Dimensions of the amplifier | 176 × 151.5 × 48 mm |
| Mass | 1.4 Kg |
Evaluation
- Amplifiers, processors and accessories Monoblocks and multichannel amplifiers 4-channel car amplifiers
- Amplifiers, processors and accessories Amplifiers with integrated DSP processor
- Amplifiers, processors and accessories DSP processors
- Traditional Japanese manufacturer of car radios and sound systems NAKAMICHI
