Nakamichi NSI-CS670 speakers
More about the product
- You can return the goods to us within 14 days
Nakamichi NSI-CS670 Speakers
Nakamichi NSI-CS670 is a two-way component speaker system from the NSI line, designed to deliver a significant sound upgrade over factory systems for users seeking a clean, dynamic and musical presentation without unnecessary installation complexity. The system is built on proven design principles and quality materials that ensure a balanced sound across the entire audible band. At the heart of the set is a 165 mm mid-woofer with a glass-fiber cone. The glass fiber cone combines high rigidity with low weight, resulting in fast response, good cone control and clear reproduction of mid and lower frequencies. The mid-woofer is also fitted with a phase plug that improves midrange dispersion, supports a smoother transition to the tweeter and contributes to better soundstage and instrument localization. High frequencies are reproduced by a tweeter with a ceramic dome, which is characterized by high stiffness and very low distortion. The ceramic diaphragm enables precise, detailed and very clean high-frequency reproduction without unnecessary harshness. The tweeters also include a stylish protective grille that not only protects the dome but also underlines the aesthetic level of the entire set. The system includes separate passive crossovers that ensure the correct division of the frequency band between the mid-woofer and the tweeter. Their role is to maintain clarity of musical layers, prevent mutual band overlap and ensure a calm, balanced performance from the whole system. The Nakamichi NSI-CS670 supports Hi-Res audio playback and is suitable for installation on a factory car radio as well as for connection to a dedicated amplifier. Thanks to its sonic tuning, it is an ideal choice for users who want a noticeable step up from factory sound without having to resort to more complex three-way systems.
Key features
- Two-way component system from the Nakamichi NSI series.
- 6.5" (165 mm) mid-woofer.
- Glass-fiber cone diaphragm (glass fiber cone).
- Phase plug for improved midrange dispersion.
- Durable rubber surround for long life.
- 25 mm tweeter with a ceramic dome.
- Stylish protective grille for the tweeter.
- Separate passive crossovers.
- Suitable for Hi-Res audio.
- Designed for upgrading factory sound as well as for more advanced installations.
About Nakamichi
The history of the Nakamichi brand dates back to 1948, when it was founded in Japan by Etsuro Nakamichi. The path to realizing his dreams began with the establishment of the small Nakamichi Research Corporation in Tokyo. It focused on research into sonars and magnets and provided development solutions for leading brands, government institutions, universities and other organizations. Since then it has established itself as a trusted creator of high-quality products that are the result of intensive scientific work, a passion for sound and a commitment to deliver uncompromising quality and performance. In 1972 Takeshi Nakamichi joined Nakamichi Corporation and played a key role during its period of expansion. He was closely involved in the development of all the brand's legendary audio products sold in Asia, America and Europe — including the launch of the Nakamichi 1000, the world's first cassette deck. He was regarded as one of the world's finest acoustic and audio engineers, able to combine top-tier sound with the design virtues of Mr. Koza Kobayashi, the brand's then-chief engineer. These amplifiers, players and car stereos are today considered legends for their unrivaled quality. However, the Nakamichi brand remains successful today, producing high-quality products not only for home audio but also for vehicles. The manufacturer's cleverly conceived portfolio continues to expand and virtually all products stand out for their quality sound and excellent workmanship in their price category.
| Catalog number | NSI-CS670 |
| Brand | Nakamichi |
| Links | Official web presentation |
| Speaker typeCoaxial speakers: Coaxial speakers are characterized by a so-called all-in-one design. The tweeter and mid-bass speaker are in one basket. The advantage is simpler assembly, but thanks to the connection or proximity of the bands in one speaker, the sound quality will usually be reduced. As a rule, in the middle of the mid-bass speaker, there is a tweeter whose voice coil works in the second air gap of the common magnetic circuit. The three-way coaxial speaker consists of a mid-bass speaker, a center speaker and a separate tweeter in the front on a special beam. Component Speakers: Component speakers are characterized by a division into individual frequency bands, treble + mid-bass + or. bass band. The individual speakers can be placed completely separately, which results in a better sound and acoustic performance. In the vast majority of cases of component speakers, an external crossover is also supplied, which divides the treble, middle / mid-bass, and into the three-band the bass band or allows setting the decibel level of the tweeter (e.g. +2 dB, 0 dB, -2 dB), steepness (e.g. 6dB/Oct. 12dB/Oct.) or active or bi-amp connection. | 2-way component |
| RMS powerRMS speaker power is the constant power of the entire system, not just one speaker or one side. This is also the performance of continuous use of the speakers. If the RMS power is exceeded for a long time, the speakers may be irreversibly damaged! | 150 W |
| Max. (maximum performancePeak performance , which the speaker can play for a moment (approx. 0.5 s), for example when hitting drums in a song. If the max power is exceeded, the speakers will usually be damaged! | 1050 W |
| Sensitivity (SPL 2.83V/1m)Sensitivity, sensitivity or efficiency of the speaker. Speaker sensitivity is given in decibels (dB) and simply put, the higher the value, the lower the demands on the amplifier's power. This is a defacto rating of how a speaker converts watts to sound. Sensitivity ratings are in noise level measured at 1 meter from the speaker using 1 W (watt of power) or using 2.83 volts at the source at 1 meter. A higher decibel level means the speaker is louder with less power. For every 3 dB increase in sensitivity, the speaker requires half the power to reproduce the same volume. For example, if an 88 dB speaker needs 100 Watts to produce a certain volume, then a speaker with a sensitivity of 91 dB needs only 50 Watts to reach the same volume. | 91 dB |
| Sensitivity (SPL 1W/1m)Sensitivity, sensitivity or efficiency of the speaker. Speaker sensitivity is given in decibels (dB) and simply put, the higher the value, the lower the demands on the amplifier's power. This is a defacto rating of how a speaker converts watts to sound. Sensitivity ratings are in noise level measured at 1 meter from the speaker using 1 W (watt of power) or using 2.83 volts at the source at 1 meter. A higher decibel level means the speaker is louder with less power. For every 3 dB increase in sensitivity, the speaker requires half the power to reproduce the same volume. For example, if an 88 dB speaker needs 100 Watts to produce a certain volume, then a speaker with a sensitivity of 91 dB needs only 50 Watts to reach the same volume. | 88 dB |
| ImpedanceImpedance - measurement of electrical resistance. When buying speakers, it is important to make sure that the impedance matches the amplifier or car stereo you are using. Example: A 2 Ohm speaker cannot be connected to an amplifier that is only stable up to 4 Ohms! A 4 Ohm speaker can easily be used with an amplifier that is stable up to 2 Ohms. The most common speaker impedance today is 3 - 4 Ohm. | 3 Ω |
| Frequency rangeThe ability of the speakers to play a signal from the lowest frequency to the highest, or the speaker's ability to faithfully reproduce 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. | 55 - 20000 Hz |
| The diameter of the mid-bass speakerWe state the diameter of the speaker as the diameter of the entire speaker, not including the mounts, when smaller speakers (87, 100, 130 mm) have extra mounts. Some speakers are oval and there the dimension is given in inches, always the shortest side to the longest side. One inch is approx. 2.5 cm. | 165 mm |
| Installation depth of the mid-bass speakerThe installation depth of the speaker is measured from the bottom edge of the magnet to the bottom edge of the tin, plastic or cast speaker basket, or speaker bearing surfaces. | 74 mm |
| Mid-woofer diaphragm materialThe material that was used for the speaker diaphragm. Don't be afraid of the paper, it surprisingly has a very natural and high-quality sound and, thanks to the surface treatment, it can withstand moisture without any problems. | Glass fibers |
| Tweeter dome diameterThe net diameter of the dome (diaphragm) of the tweeter. | 25 mm |
| Tweeter dome materialThe shell material that was used in the manufacture of the tweeter. | Ceramic |
| Frequency crossover included in the packageThe crossover is an important part of defacto all loudspeakers. A crossover usually contains different resistor values, coil sizes, and capacitor types that fundamentally modify the sound. We describe below what the turnouts are for. Component Speakers: A crossover is part of every quality component speaker system. Its task is to ensure the distribution of frequencies that the amplifier produces in the entire acoustic spectrum of frequencies so that each of the speakers receives only that part of the band that it can optimally play in terms of efficiency and minimal distortion. Coaxial speakers: In most cases, coaxial loudspeakers have a simple crossover (6dB/Oct.) formed by a capacitor at the tweeter. | Yes |
| Options for setting the frequency crossoverThe unwritten rule is that the more expensive the speakers, the more options the crossover has for adjusting the sound. The most common way to adjust the crossover is attenuation on the tweeter. More advanced crossovers also offer the option of setting the steepness on the mid-bass and tweeter or adjusting the frequency range. | Yes |
| Cover grids included in the packageOriginal cover grilles in speaker packaging. | Yes |
| Price forIf the price is for a pair, the package always includes 2 pieces of everything, e.g. 2x mid-bass, 2x tweeter and 2x crossover. | Pair |