Amplifier Zapco HB 501D II

Name: Amplifier Zapco HB 501D II
Brand: Zapco
Price: 269.00 EUR
Availability: InStock

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1-channel amplifier, 1 x 300 / 500 W RMS (4 / 2 Ω), class D, compact dimensions, remote control
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Amplifier Zapco HB 501D II

The Zapco HB 501D II is a single-channel amplifier from the basic Harmony series, offering an exceptional balance of performance, quality, and compact dimensions. With Class D circuitry, it impresses with high efficiency and easy installation even in limited spaces. Its high power of up to 1 × 500 W RMS makes it an ideal choice for powering powerful subwoofers. It guarantees quality sound with the characteristic signature of Zapco, a fully aluminum brushed chassis, massive connection terminals, and extensive features including bass boost and subsonic filter.

Main Features

1-channel Class D amplifier with high efficiency.
Power: 1 x 300 / 500 W RMS (4 / 2 Ω).
Compact dimensions suitable for hidden installation.
Quality sound typical for the Zapco brand.
Variable gain control.
Low-level inputs (RCA).
LPF, subsonic filter, bass boost.
Massive terminals for reliable connection.
Brushed aluminum chassis in black finish.

Harmony Blue Note Series

The Italian brand Harmony emerged in the 1980s alongside the first home speakers from the Italian high-end manufacturer ESB Audio. Production of car speakers began in the 1990s with a wide range of products that combined high sound quality with a significantly lower price than ESB Audio products. The main mission of the Harmony brand was to provide a high standard of sound quality with faithful reproduction of the entire sound spectrum, superior workmanship, all at a more affordable price. The same applies in 2023 when Zapco decided to create a new product line, Harmony. And why Blue Note? With this term, Zapco reminisces about the Blue Note Jazz era from 1930 to 1950. It is a way to connect the name of audio products with significant moments in modern music history. Harmony now returns to the market with a wide range of DSP amplifiers, which will expand in the future with more products to offer a complete line of audio equipment and meet the needs of all music enthusiasts.

About Zapco Amplifiers

Zapco is the oldest high-end car audio brand in the world, specializing in top-notch amplifiers and DSP processors for cars. The company was founded in the USA in 1974 and has since been collecting one award after another. This includes recognition from prestigious organizations that evaluate product quality and innovation, as well as at global competitions focused especially on sound quality. Zapco amplifiers represent audiophile quality without compromise, defining the standard of quality and setting criteria by which other products in this field are judged. For over 45 years, Zapco has been continuously seeking innovative ways to bring better sound to the automotive environment, and this relentless pursuit of absolute sound quality brings new technologies and high-end products. Why? Because nothing else can touch the soul and bring tears to the eyes like music. Music allows you to dance for joy... of all art forms, music 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 greatest effort from all Zapco employees. And also because music matters!

Catalog number	HB 501D II
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.	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.	1
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.	1 x 300 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.	1 x 500 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.	10 - 180 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.	> 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 - 6 V
Input impedance	22 KOhm
Low-pass filter (LPF)LPF / LP or "low pass filter" offers the possibility to adjust the amplifier using a potentiometer so that the lower band plays only the frequencies in a certain band that you need. This filter is used to adjust the frequency range for the subwoofer, so that it does not overload or distort the sound. Example: Amplifiers most often have an LPF from 20 to 300 Hz. We recommend setting this potentiometer in the range of 45-80 Hz.	30 - 80 Hz
SubsonicA subsonic filter is essentially a high-pass filter for very low frequencies, typically 45 Hz or lower. Anything below this setting is weakened. The point is that the subwoofer does not go below the subsonic filter setting and does not overload itself with very low frequencies. A useful function, if set correctly, the subwoofer is not overloaded.	20 - 50 Hz
Bass boostBass boost or bass enhancement. With this function, the bass itself can be emphasized, at a high level of bass boost, the speakers and the subwoofer can distort a lot and the sound will be worse than better. We therefore recommend using the "bass boost" function wisely. With maximum use of bass boost, there is a risk of damage to the speakers and thus to the subwoofer.	0 - 12 dB
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.	12 - 14.4 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
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	175 x 115 x 45 mm