Speakers Quartorigo Fantasia Sub
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Quartorigo Fantasia
Fantasia in musical tradition is a symbol of absolute creative freedom — a space where classical rules bend to the author’s vision and imagination becomes the main driving force of innovation. It represents the courage to cross boundaries, explore uncharted sonic territories and transform bold ideas into extraordinary reality. This very spirit of uncompromising creativity and artistic rebellion is at the heart of the Quartorigo Fantasia speakers. They are not designed merely to reproduce sound, but to unleash the full spectrum of musical expression in all its breadth and emotion. Every driver, every single component and every design decision reflects tireless effort toward acoustic perfection through unconventional thinking. Fantasia does not follow established paths — it follows inspiration as a guiding principle and constantly redefines the limits of what’s possible through a pure creative vision. As with other Quartorigo products, the Fantasia line is completely designed, developed and manufactured in Italy, certified by the internationally recognized 100% Made in Italy stamp. 
Quartorigo Fantasia Subwoofer
The Quartorigo Fantasia Sub is the bass foundation of the Fantasia range and embodies the brand’s philosophy in its most concentrated form. Its very execution clearly indicates that this is not an ordinary subwoofer aimed at showy bass, but a precise instrument intended for accurate and controlled reproduction of the lowest frequencies with maximum authority and musicality.
The subwoofer uses a 250 mm paper cone, which in deep black finish looks exceptionally clean and technical. Paper was not chosen by chance — it offers an ideal combination of low mass, internal damping and natural response, which positively affects the readability of bass structures and the natural decay of tones. A nominal power of 250 W RMS should be understood in the context of Quartorigo’s philosophy, which consistently works with real, technically honest values rather than marketing-inflated figures. The subwoofer’s construction, including a massive 75 mm voice coil, is rated for significantly higher loads, and therefore the recommended amplifier power is up to 800 W RMS. This reserve is not about extreme loudness, but primarily about absolute control, dynamic certainty and stability of performance even in demanding passages.
The use of a neodymium magnet in a subwoofer of this category is exceptional and again confirms the brand’s unconventional approach. Neodymium provides an exceptionally strong magnetic field in very compact dimensions, allowing high acoustic performance without a bulky magnet system. This makes it possible to install the Fantasia Sub in tight spaces and compact enclosures where conventional subwoofers with ferrite magnets would encounter spatial limitations. The basket design follows the minimalist, open concept applied to the Fantasia woofer. Maximized airflow significantly reduces turbulence and back pressure around the voice coil, improves cooling and contributes to lower distortion at large excursions. The subwoofer therefore preserves a calm, firm and precisely defined character even under prolonged load.
The Fantasia Subwoofer is optimized for a sealed enclosure of approximately 15 l, making it an ideal solution for high-end car installations where compact dimensions, fast response and maximum integration with other system drivers are crucial. The result is bass that is not dominant on its own, but forms a solid, deep and natural foundation for the entire musical scene.
About Quartorigo
For music Lovers. The motto of this Italian manufacturer, depicted by the conductor in its logo, also expresses Quartorigo’s fundamental principles. In a highly competitive market where brands and products quickly lose identity, Quartorigo offers a clear and solid origin. Quartorigo is proud of its heritage and in every product combines the essence of Italian design, honest craftsmanship and a passion for music through which it seeks to express its way of being, thinking and perceiving. With Quartorigo products you can instantly move from the concert hall to the seats in your car, experiencing the same emotions without losing a single note. Aligned with this concept, Quartorigo embodies a true conductor sitting in front of you, delivering a unique musical experience that remains faithful to its roots. For more than 25 years you can rely on handcrafted products born in the distant past, refined over time and lasting a lifetime.
| Catalog number | FANTASIA SUB |
| Brand | Quartorigo |
| Links | Official web presentation |
| RMS powerThe RMS power of the subwoofer is the constant power of continuous use of the subwoofer. If the power is exceeded for a longer period of time, irreversible damage may occur, or to burn out the voice coil of the subwoofer. | 250 W |
| Sensitivity (SPL 2.83V/1m)Subwoofer sensitivity or efficiency. The sensitivity of the subwoofer is given in decibels (dB) and, in simple terms, means that the higher the value, the lower the demands on the power of the amplifier. This is a de facto rating of how a subwoofer converts watts to sound. Sensitivity ratings are in noise level measured at 1 meter from the subwoofer using 1 W (watt of power) or using 2.83 volts at the source at 1 meter. A higher decibel level means the subwoofer is louder with less power. For every 3 dB increase in sensitivity, the subwoofer requires half the power to reproduce the same volume. For example, if an 88 dB subwoofer needs 300 Watts to produce a certain volume, then a subwoofer with 91 dB sensitivity needs only 150 Watts to reach the same efficiency. | 87.9 dB |
| ImpedanceImpedance - measurement of electrical resistance. When buying a subwoofer, it is very important that everyone make sure that the impedance matches the amplifier that you are connecting to it. For subwoofers with a double voice coil, we recommend following the information in the advice center! Example: A 2 Ohm subwoofer cannot be connected to an amplifier that is only stable up to 4 Ohms. A 4 Ohm subwoofer can easily be used on an amplifier that is stable up to 2 Ohms. Connecting a 4 Ohm subwoofer to an amplifier that is stable up to 4 Ohms also without problems. The most common subwoofer impedance is 4 Ohm. | 4 Ω |
| Frequency rangeThe ability of the subwoofer to play a signal from the lowest frequency to the highest, or the ability of a subwoofer to faithfully reproduce sound in a specific frequency band. Subwoofers ideally play from 20 - 150 Hz. 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 indicate this maximum tolerance of sound pressure in decibels in their catalogs for tactical reasons. 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. | 28 - 500 Hz |
| Subwoofer diameterThe diameter of the subwoofer is indicated on the screw holes. The overall outer diameter of the subwoofer is usually 1-2 cm wider, depending on the size category of the subwoofer. For a 30 cm subwoofer, the outer diameter incl. protective rubber 31.8 cm and in the 25 cm subwoofer it is 26.5 cm incl. protective rubbers. | 250 mm (10\") |
| Recommended enclosure volumeThe closed enclosure is characterized by a simple construction. Closed enclosures are usually smaller than bass-reflex enclosures, and a special damping fleece is used for their damping. A closed baffle has the advantage of preventing an acoustic short between the front and back radiation of the subwoofer diaphragm. The disadvantage is that the closed enclosure raises the natural resonance frequency of the used subwoofer and thereby also increases the lower limit frequency. This is because the back side of the diaphragm is forced to compress and dilute the air inside the enclosure when the subwoofer is radiating in a closed enclosure. This adds to the inherent stiffness of the subwoofer's oscillation system the stiffness of the air in the closed enclosure. This causes an increase in the stiffness of the oscillating system and thus an increase in the resonant frequency of the entire system: subwoofer -> loudspeaker. The increase in resonant frequency for a given subwoofer is greater, the smaller the volume of air in the closed enclosure. The relatively small volume of air in the closed enclosure acts on the subwoofer as an acoustic spring when radiating the back side of the membrane into the enclosed enclosure. USE: Mainly for quality bass listening in the entire band with an emphasis on detail and accurate reproduction in the lower band. Pros and cons: + pure reproduction + small closets + easier tuning - low level of efficiency in deep bass - loudness only at the cost of enormous deflection of the membrane - a significant acoustic pressure cannot be expected | 15 l |
| Fs - resonant frequencyFs - is the lower resonant frequency. This parameter is the de facto free air resonant frequency of the subwoofer. Simply put, it is the point at which the weight of the subwoofer's moving parts equals the force of the subwoofer's suspension while it is in motion. If you've ever seen a piece of string start to hum uncontrollably in the wind, you've seen the effect of reaching a resonant frequency. The weight of the moving parts and the stiffness of the suspension (surround and spider) are key elements that affect the resonant frequency. As a general rule, a lower Fs indicates a subwoofer that would be better at reproducing low frequencies than a subwoofer with a higher Fs. However, this is not always the case, as other important parameters of the subwoofer also enter the resulting sound. | 60.15 Hz |
| Subwoofer voice coil diameterThe larger the diameter of the voice coil, the more load capacity the subwoofer has, in layman's terms. | 75 mm (3\") |
| Subwoofer diaphragm materialThe specific material from which the subwoofer membrane is made. | Paper |