Zapco ST-4X DSP amplifier - used goods
More about the product
- You can return the goods to us within 14 days
- The amplifier is in 100% condition and fully functional.
- Original box slightly damaged.
- Minor marks from installation.
- Missing cable (USB-A to USB-B).
Zapco ST-4X DSP Amplifier
Zapco's Studio-X amplifier series was designed specifically for today's car audio market. The compact Studio-X chassis allows easy installation in any vehicle, and thanks to the modern, angular black design the amplifiers look great in every installation. The second-generation four-channel amplifier with a DSP processor was engineered to deliver Zapco's unmistakable quality in a compact, elegant black chassis. Thanks to top internal components and innovative design, the Zapco ST-DSP amplifiers boast world-leading sound quality in their price range. For 2019 Zapco offers two amplifiers with integrated DSP processors that let you fine-tune the sound to the last detail. They feature high-pass and low-pass filters, phase adjustment, time correction, and even a 15-band parametric equalizer on each channel. To make tuning effortless, Zapco developed a highly functional and easy-to-use PC program. With the ST-4X DSP and ST-6X DSP amplifiers you get stunning Class A/B sound in a compact chassis with amazing tuning capability.
Main features of the Zapco ST-4X DSP
- 4-channel Class A/B amplifier
- Integrated DSP processor
- Stable down to 2 Ω; bridged to 4 Ω
- RCA and OEM high-level inputs
- Stepless input level control
- Removable terminal block input connectors
- Optical digital input
- Bluetooth music streaming capability
Key features of the Zapco Studio-X series
The Studio-X series includes fourteen amplifiers in total — ten Class A/B units and four Class D monoblocks. All of these amplifiers use the same bipolar output devices, op-amps, and premium capacitors found in Zapco's higher-end models. Common features of Studio-X amplifiers include variable electronic crossovers (HP/LP/Full Range), variable bass boost, selectable channel-pair gain, high-level speaker inputs, robust terminal blocks, and preamp outputs for connecting an additional amplifier without needing extra RCA cables. Durability and reliability are also strengths. It's not uncommon to see Zapco amplifiers moved from car to car and passed down from generation to generation. Zapco amplifiers made in the 1990s are still bought and sold online by sound-quality enthusiasts around the world. The Studio-X line will be no different. And of course the most important feature shared by all ST-X amplifiers is Zapco's legendary sound quality, developed over more than 40 years of experience.
About Zapco
Zapco is the oldest high-end car audio brand in the world, specializing in premium amplifiers and in-car DSP processors. The company was founded in the USA in 1974 and has been collecting award after award ever since. These accolades have come from prestigious organizations that assess product quality and innovation, as well as from global competitions focused on sound quality. Zapco amplifiers represent uncompromising audiophile quality, defining the standard of excellence and setting the benchmarks by which other products in the industry are judged. For over 45 years, Zapco has continuously sought innovative ways to bring better sound to the automotive environment, and this tireless pursuit of absolute sound quality has produced ongoing technological advances and high-end products. Why? Because nothing else can capture the soul and bring tears to the eyes like music. Music lets you dance for joy; of all the arts, it has the strongest and most immediate impact on your body and mind. The reproduction of music in all its beauty and subtlety deserves nothing less than the utmost effort of everyone at Zapco. And also because music matters!
| Catalog number | ST-4X DSP-P1 |
| Brand | Zapco |
| Links | Official web presentation (English) |
| 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. | A/B |
| 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 65 / 2 x 180 W |
| RMS power into 2 ΩRMS power when loading speakers or subwoofer at 2 Ω. RMS power is the constant power of the amplifier and is one of the most important parameters when choosing an amplifier. | 4 x 90 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. | 15 - 30000 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. | < 0.2% |
| 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. | > 90 dB |
| Input sensitivityIn order for the amplifier to perform its function correctly, it requires an input signal of a certain level, which is different for car radios. It is measured in "Volts" (e.g. 2 V, 4 V, etc.) The higher the value at the output of the pre-amplifier, or car radio, the less demands are placed on the power of the amplifier. However, the amplifier must allow this input sensitivity, and for that reason this value is also given for the amplifier. | 0.25 - 5 V |
| The value of the fuses on the amplifierFrom the value of the fuses on the amplifier, you can get a true picture of the real performance of the amplifier. | 2 x 30 A |
| 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 |
| Socket input terminalsFerrule terminals allow better wiring contact to the amplifier. It is also a more secure form of terminals. If you are tightening the sleeve terminals, we recommend retightening them after 1 day, as the connected cable gradually compresses. | Yes |
| Dimensions of the amplifier | 160 x 52 x 282 mm |
