Amplifier with DSP processor Nakamichi FDSK730A
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Amplifier with DSP processor Nakamichi FDSK730A
FIDELA FDSK730A is a powerful Hi-Res DSP processor with ten input and twelve output channels, complemented by an integrated ten-channel amplifier. Compared to the FDSK630A model it offers two additional input, output and amplified channels, making it suitable for larger active audio systems with tweeters, midrange and midbass speakers, a center channel, rear speakers and a subwoofer. For connecting a signal source it provides ten high-level inputs, two low-level RCA inputs and digital optical and coaxial inputs.
The integrated ten-channel amplifier offers a nominal output of 4 × 25 W + 4 × 50 W + 2 × 100 W. The 25 W channels are especially suitable for tweeters or less demanding auxiliary channels, while the four 50 W channels can be used for midrange, rear speakers or less demanding midbasses. The pair of most powerful channels provides 2 × 100 W and can be bridged to 1 × 200 W for direct subwoofer power. Twelve independently adjustable RCA outputs also allow connection of external amplifiers or using the unit as a standalone DSP processor.
The DSP offers individual adjustment of all twelve output channels via a 31-band equalizer, active crossovers, time corrections, polarity, signal level and input channel mixing. High-pass and low-pass filters allow selection of Butterworth, Bessel or Linkwitz-Riley filters with slopes up to 48 dB/oct. By combining both filters a band-pass filter can also be created. Time corrections offer a range up to 25 ms or 850 cm with an accuracy of 0.01 ms. Individual sensitivity adjustment of high-level inputs and saving of sound presets are also available.
Music can be played via built-in Bluetooth 5.1, USB storage or digitally from a mobile phone via USB OTG. The optional external Bluetooth module FIDELA FDS05B adds higher-quality wireless transmission with aptX HD and LDAC codecs. The processor can be configured via computer software or the Nakamichi FDSK mobile app. An optional Nakamichi AC6 controller with a 2" display, master and subwoofer volume control, preset selection and playback control is also supported. The FDSK730A also supports steering wheel control buttons and automatic mute or volume reduction when reverse gear is engaged. Power-on can be controlled by the signal from the first two high-level inputs or the ACC wire and the REM output is used to switch external amplifiers.
Fidela - Nakamichi's top line
Fidela represents Nakamichi's top tier, combining the brand's rich history with modern technologies and precise workmanship. Originally, the Fidela name was associated with high-end tape recorders in the 1960s, known for their innovative mechanisms and unmistakable sound. Today the Fidela brand focuses on car amplifiers and DSP processors that use top-quality components for maximum sound quality. Key features of Fidela amplifiers include, besides the use of high-quality components, excellent build quality and premium design. Thanks to these attributes, Fidela amplifiers are an ideal choice for demanding users seeking high sound quality and broad customization options in automotive environments.
Integrated 12-channel DSP processor
Inside the unit you will find quality components such as WIMA and ELNA capacitors, OPA1678 operational amplifiers and Toshiba chips operating in class AB. The DSP processor is built on the AK7735 chip from Asahi Kasei and high-quality PCM3168 circuits provide digital-to-analog conversion. The DSP offers a 31-band equalizer for each channel with 1 Hz resolution, time delay capability up to 25 ms, phase control and a choice of professional crossover types such as Butterworth, Bessel or Linkwitz-Riley. The output signal is fully tunable including gain and Q value settings. A stable and comprehensive PC tuning software and an intuitive mobile app for phone-based configuration are standard. Thanks to 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
- Hi-Res DSP processor with integrated 10-channel amplifier.
- Configuration of ten input and twelve output channels.
- Ten high-level inputs.
- Two low-level RCA inputs.
- Digital optical input.
- Digital coaxial input.
- Ten amplified high-level outputs.
- Twelve low-level RCA outputs.
- Nominal power of four channels 4 × 25 W.
- Nominal power of four channels 4 × 50 W.
- Nominal power of two channels 2 × 100 W.
- Total nominal power of the built-in amplifier 500 W.
- Bridgeable to 1 × 200 W.
- Possibility to directly power a subwoofer.
- Can be used as a standalone 12-channel DSP processor.
- Ability to combine built-in and external amplifiers.
- Frequency range 20 Hz to 40 kHz.
- Hi-Res Audio support.
- 31-band equalizer for individual output channels.
- EQ adjustment range from −12 to +12 dB.
- Adjustable Q value from 0.3 to 50.
- High-pass and low-pass for individual output channels.
- Ability to create a band-pass by combining HPF and LPF.
- Butterworth, Bessel and Linkwitz-Riley filters.
- Adjustable filter slope up to 48 dB/oct.
- Time corrections up to 25 ms or 850 cm.
- Time correction accuracy 0.01 ms or 0.34 cm.
- Individual channel polarity adjustment.
- Adjustable sensitivity of high-level inputs.
- Built-in Bluetooth 5.1.
- Wireless music playback via Bluetooth.
- Support for optional FIDELA FDS05B module with aptX HD and LDAC.
- Lossless music playback from USB storage.
- Digital music playback from phone via USB OTG.
- Support for USB storages up to 256 GB.
- Configuration via PC software.
- Control via Nakamichi FDSK mobile app.
- Support for optional Nakamichi AC6 controller with 2" display.
- Support for steering wheel control buttons.
- Configurable mute or volume reduction when reverse gear is engaged.
- Automatic power-on via high-level signal or ACC.
- Adjustable power-on delay up to 10 seconds.
- REM output for switching external amplifiers.
About the brand
The history of the Nakamichi brand goes back to 1948, when it was founded in Japan by Etsuro Nakamichi. His journey began with the establishment of the Nakamichi Research Corporation in Tokyo, focused on research of sonars, magnets and development solutions for leading brands, government institutions and universities. From the beginning the brand built on a scientific approach, deep understanding of sound and emphasis on technical precision. A key period of expansion came in 1972 when Takeshi Nakamichi joined the company and significantly contributed to the development of legendary audio products sold worldwide. Under his leadership, for example, the Nakamichi 1000 model was created, the world's first cassette deck. Thanks to the combination of top-notch sound and timeless design, to which the brand's chief engineer Kozo Kobayashi also contributed, Nakamichi products became icons of their time. Nakamichi remains successful today. Its portfolio offers high-quality products for home and car audio that stand out for thoughtful construction, quality workmanship and excellent sound within their price category.
| Catalog number | FDSK730A |
| 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. | 10 |
| 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 × 25 W + 4 × 50 W + 2 × 100 W (1 x 200 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 - 40000 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 |
| Inputs | 2 x RCA, 10 x high-level, optical, coaxial |
| Outputs | 12 x RCA |
| 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 | 12 |
| Input for wired remote controlIf the amplifier has a remote control input. | Yes - Nakamichi AC6 |
| Dimensions of the amplifier | 210 × 188 × 48 mm |
| Mass | 2.1 Kg |