Amplifier with DSP processor Nakamichi NDSE600A
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Amplifier with DSP processor Nakamichi NDSE500A
Nakamichi NDSE600A is an advanced 10-channel digital sound processor with an integrated 8-channel class AB amplifier, designed for building larger active audio systems. The configuration of eight input and ten output channels allows implementation of, for example, a fully active three-way front system, rear speakers and a separately amplified subwoofer. Compared to common DSP amplifiers operating in class D, the NDSE600A uses an analog class AB concept that focuses on a more natural sound character, richer vocal reproduction and a high level of detail. The built-in eight-channel amplifier provides a nominal power of 4 × 25 W + 4 × 100 W. The differing power of the individual channel groups enables efficient powering of speakers with different requirements – the less powerful channels can be used, for example, for tweeters or midrange speakers, while the more powerful quartet is suitable for mid-woofers or other more demanding components. Thanks to this, even a more complex active system can be built with a minimal number of external amplifiers.
The digital section uses the AKM7735 sound processor and offers a dynamic range of up to 117 dB. A 31-band equalizer and extensive system tuning options are available for each of the ten output channels. Six separate sound presets can be stored in memory and switched between according to the type of music or vehicle occupancy. Configuration is done via computer software or a mobile app. The NDSE600A offers eight high-level inputs for easy connection to the factory head unit and ten low-level outputs for connecting additional external amplifiers. It also supports wireless music playback via Bluetooth, lossless playback from USB storage and connection of an optional external controller with an LCD display. The Nakamichi NDSE600A thus represents an interesting solution for advanced installations that require a large number of channels, high power, flexible configuration and the sonic character of class AB amplifiers.
Main features
- 10-channel digital sound processor.
- Integrated 8-channel class AB amplifier.
- Eight input and ten output channels.
- Nominal power 4 × 25 W + 4 × 100 W.
- Four more powerful channels suitable for mid-woofers or more demanding speakers.
- Four less powerful channels suitable for tweeters and midrange speakers.
- Capability to create a fully active three-way system.
- Eight high-level inputs for connection to the factory head unit.
- Ten low-level outputs for connecting external amplifiers.
- Option to combine the built-in and external amplifiers.
- AKM7735 sound processor.
- Dynamic range up to 117 dB.
- 31-band equalizer.
- Independent adjustment of the ten output channels.
- Ability to save six sound presets.
- Built-in Bluetooth for wireless music playback.
- Support for lossless music playback from USB storage.
- Configuration via computer software.
- Control via mobile app.
- Support for an optional external controller with LCD display.
- Bluetooth playback frequency range 20 Hz to 20 kHz.
About the brand
The history of the Nakamichi brand dates 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 was built on a scientific approach, a deep understanding of sound and an emphasis on technical precision. A decisive 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, models such as the Nakamichi 1000 were created, the first cassette tape recorder in the world. Thanks to the combination of top-tier sound and timeless design, to which the brand's chief engineer Kozo Kobayashi also contributed, Nakamichi products became icons of their time. The Nakamichi brand 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 | NDSE600A |
| 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. | AB |
| 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. | 8 |
| 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 25 + 4 x 100 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 |
| Inputs | 2 x RCA, 8 x high-level |
| Outputs | 10 x RCA |
| Standby power consumption | < 0.005 A |
| On-board voltage rangeThe ability of the amplifier to operate at a specified voltage. As the voltage decreases, so does the power of the amplifier. The ideal voltage in a car is between 13.8 and 14.4 V. | 9 – 16 V |
| 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 | 10 |
| Output equalizer | 31 bands |
| Filters | HPF, LPF |
| Filter types and slope | Butterworth, Bessel and Linkwitz-Riley (from 6 to 48 dB/oct) |
| Input for wired remote controlIf the amplifier has a remote control input. | Yes |
| Dimensions of the amplifier | 270 × 213 × 49 mm |
| Mass | 2.8 Kg |