What is stereo?




There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.




H.H. Scott '59





Advent 3002 loudspeakers

 The Advent 3002 and 2002 are Advent's smallest loudspeakers. Since "big"-is a word sometimes used to describe sound quality (not just cabinet size0, it's worth taking a minute to look at just exactly how size does affect what you hear. Up to a point, cabinet volume will determine how much bass a loudspeaker system can reproduce. All Advent loudspeakers are acoustic suspension  designs, this approach yields the lowest bass possible for a given size - other designs of similar size don't come close to giving you the bass response that Advent loudspeakers do.

However, the sound qualities that make a loudspeaker satisfying - smooth frequency-to-frequency balance, wide dispersion, and the power handling necessary for your listening room - are not limited by the size of the loudspeaker. Thorough engineering and good design endow a speaker system with the ability to sound 'big" or to give you your music life size.

In designing the models 3002 and 2002, Advent have traded some of the lowest frequency response for smaller, more convenient cabinet sizes and the lower cost that allows.  Advent haven't traded any of the quality aspects that make a loudspeaker a pleasure.

Ample Power Handling Capacity.

The device which excites the air, whether piano or speaker, must have the force to move all the air between itself and your ear. This is not to say you need a concert grand in a studio apartment, but you do need enough clout to do the job without strain. Advent loudspeakers can fill home-sized rooms with deep bass and smooth, balanced stereo at levels that recall the first time you heard live music.

 

The 3002 delivers startling performance for its price and size. The "Direct Report" tweeter brings the listening advantage of solid, focused stereo imaging and the power handling capacity to fill all but barnsized rooms. A smaller Advent woofer designed to offer deep bass in small enclosures adds an important degree of usable low frequency output when compared to like prieced competitors. The 3002 in combination with a receiver of modest power makes a system that clearly outshines others using speakers of similar size and price.

 


The new "Direct Report" tweeter

Advent's new "Direct Report" tweeter is exceptionally smooth and has outstanding high and mid frequency dispersion.

Three factors differentiate the "Direct Report" tweeter from conventional dome tweeter s. first, the geometry of the phase plate places a carefully calculated air mass at the perimeter of the dome. The linearity of the driver through its range is the result of putting the mass to work. Second, the taper of the phase plate and countersunk mounting hardware form an acoustically neutral environment. Third, the shape of the dome is parabolic, not hemispheric -  a geometric difference that places the vertex of the dome forward of the phase plate. This accounts for the system's outstanding dispersion characteristics and, in stereo pairs, produces sharply focused imaging.

The Classic Advent Woofer

The 3002 utilizes the classic Advent low frequency driver. This acoustic suspension woofer is renowned for awesome deep bass capability and prodigious power handling capacity. By careful choice and integration of the cone material, the cone diameter, and the excursion capability, this woofer not only radiates high acoustic output at low frequencies, but also offers wide dispersion at the upper end of its range.

The Crossover

The crossover network is often an underestimated consideration in the design of a loudspeaker system; however, the crossover network chosen for the 3002 is the product of as much development time as any element of the system. It is the reason for the audibly seamless transition between drivers. One important advantage of designing and building drivers from the gound up (as Advent does) is the "fit" of the crossover to the driver. This complementary relationship, maximized in the 3002, makes for a system that can be driven easily by any amplifier or receiver.

The Cabinet

The cabinet is constructed of a dense, non-resonant composite board ideal for acoustic application. The careful placement of the drivers on the baffle board minimizes cabinet diffraction and the resulting response aberrations.

 


Specifications:

Frequency Response:  48 Hz - 23 kHz ±3 dB (on axis)

Impedance:  8 Ω nominal, 7 Ω minium

Resonance:  58 Hz ±2 Hz

Harmonic Distortion:  less than 1% over 80 Hz (1 watt)

Dispersion:  less than ±1 dB variance 30°V or H to 13 kHz

Crossover Frequency:  2,800 Hz

Sensitivity:  88 dB ( at 1 W/1 m on axis)

Frequency Range: 

Low Frequency :  40 Hz - dB

High Frequency :  23 kHz - 3 dB

Dimensions (H x W x D):  20" x 12" x 8-1/2"

Weight;  21,5 lbs

Finish:  Walnut grain vinyl over high density composition board

Nessun commento:

Posta un commento