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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





Showing posts with label ADVENT. Show all posts
Showing posts with label ADVENT. Show all posts

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

Advent 2002 loudspeakers

 

The 2002 is Advent's least expensive loudspeaker system. It supplies, at low cost, the wide frequency range, critically adjusted tonal balance and broad dispersion that make the performance of inexpensive systems far better than most people expect.

Three faactors make the 2002 remarkable:

When compared to many like-priced speakers, the 2002 delivers up to entire additional octave of bass. No one who has heard this level of bass performance is likely to settle for less.

It can be driven by virtually any amplifier. The efficiency of the 2002 solves system matching problems; even small amplifiers caan produce satisfying sound levels.

The 2002 cabinet is scaled to take up minimum space. Like all Advent loudspeakers,, the colors and textures of the 2002 are at home anywhere.

 

The Advent High Efficiency Tweeter

This Advent driver is similar in appearance to many others, but there's more than meets the eye. The smoothness of this tweeter puts it in the class of top notch speaker systems. The engineering behind the high efficiency tweeter takes full advantage of the best understood design approaches and uses new materials to more closely approach theoretical ideals. In particular, the surround, because of the unusual suppleness its composition provides, damps out cone resonances that color the sound. The offset placement (mirror image) of the driver on the baffle board allows pinpoit stereo imaging in close quarters and insures smoother response in a wide variety of placement locations.

 


Low Frequency Driver

This Advent designed low frequency driver develops deeper bass response than competitively sized loudspeakers. The special cone construction and flexible urethane surround are responsible for the smooth response throughout its operating raange. This woofer is remarkable in its linearity to beyond 3200 Hz. The carefully calculated balance of cone diameter, cabinet volume, and magnet strength contribute substantially to the power handling ability and uncommonly good bass response shown by the system using this woofer.

 

The crossover

The crossover network is often an underestimated consideration in the design of a loudspeaker system; however the crossover network chosen for the 2002 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 ground up (as Advent does) is the "fit" of the crossover to the driver. This complementary relationship, maximized in the 2002, 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.

The proportions and crisp styling of the cabinet are in keeping with the Advent philosophy that a value-oriented loudspeaker system can be attractive; appearance is another important way a loudspeaker can give ongoing satisfaction.

 

Specifications:

Frequency Response:  50 Hz - 23 kHz ±3 dB (on axis)

Impedance:  8 Ω nominal, 6 Ω minium

Resonance:  62 Hz ±2 Hz

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

Crossover Frequency:  3,200 Hz

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

Frequency Range: 

Low Frequency :  42 Hz - dB

High Frequency :  22 kHz - 3 dB

Dimensions (H x W x D):  18-1/2" x 11" x 8"

Weight;  16,5 lbs

Finish:  Walnut grain vinyl over high density composition board


Advent 2

 Advent 2
If your budgett for stereo equipment is limited, and you would like the highest possible quality for what you spend, we believe a stereo system built around the Advent/2 loudspeaker may well be the best buy you can make.
We make that statment out of a conviction that the Advent/2 is a genuinely new kind of low-cost loudspeaker. Its sound quality is very close to that of the best speakers available at any price. It can fill a big living room with more than enough low-distortion sound to satisfy most people's greatest demands. And the bargain it represents is further increased by its efficiency, which is high enough to provide satisfying performance in average use with low-cost, low-power amplifiers and receivers.
The Advent/2 is the product of many years' experience in the design of speakers intended to offer better and better performance at lower and lower cost. Its overall design is based on evertything we have learned about talking the most simple and direct route to high performance, and we have put everything we can into it - including far more expensive basic loudspeaker components than ever before used in a system of its cost. Because it is intended to be first-quality in every sense, we have given as much attention to its appearance as to its performance, replacing the usual low-cost imitation wood cabinet with a distinctive  molded enclosure that we believe will look fresh and appealing for years to come.
The Advent/2 represents our best effort to provide absolutely eveything we believe important in a speaker for the lowest possible cost - and to bring genuine component stereo of very high quality to many people who otherwise might have to settle for something that only looks like the real thing.


Advent Model 201 Cassette Recorder


The Advent model 201 Tape deck is, to our way of thinking, the ideal source for playing music in the home. It combines the important characteristics of a high-performance open-reel tape recorder  with the convenience of cassettes. The Advent Model 201 will make recordings that are indistinguishable from most source material, including the best stereo records and FM broadcasts.
Of equal importance, the Model 201 realizes the full potential of the new "Dolbyized" commercially recorded cassettes, the most significant source of recorded music since the introduction of the stereo disc.  The best of the "Dolbyized" pre-recorded cassettes are easily the equivalent of the best disc recordings, and the number of releases will be continually in creasing.

The Model 201 has the ruggedness and day-to-day operating dependability of the best home recorders, and will maintain its original performance over long and constant use.

Intro
The Advent Model 201 is a high performance cassette tape deck incorporating many recent advances in home entertainment electronics. The most significant of these is the Dolby System, a patented electronic circuit that greatly reduces the amount of noise added by the tape during the recording process. In addition the Model 201 incorporates the circuitry to take full advantage of the new DuPont-developed chromium dioxide tape sold by Advant under the ADVOCATE Crolyn label.
The Model 210 incorporates more than the usual number of user-accessible adjustments to permit the serious recordist to achieve the recording quality that, just a short time ago, was thought possible only with the best and most expensive open reel recorders.

Specifications
The Model 201 is the synthesis of the various elements required for high fidelity cassette performance; a heavy duty transport mechanism with stable mechanical characteristics; low-distortion, low-noise electronics; a high performance head; the proper use of Crolyn tape, and the Dolby System. A separate low noise microphone preamplifier is available as an accessory for those interested in professional quality live recording.
The transport uses a high-torque AC motor coupled through an intermediate rubber idler to an oversized, balanced capstan flywheel. In addition to low wow and flutter, the transport provides very fast wind speeds and an extremely accurate tape counter for easy indexing of recorded material. At the end of cassette, the pinch roller and heads are automatically disengaged.
The electronics, completely designed and manufactured by Advent, adapt many of the features found previously only in expensive reel to reel tape decks to cassette circuitry. The dynamic range and Signal-to-Noise ratio in all electronic stages exceed by a significant margin those of any known tape so that the electronics in no way limit performance. In fact, the ultimate performance, like that of the very good open reel recorders, is limited by the tape itself.

Speed:  1,875 ips
Wow and Flutter:  less than 0,15% DIN weighted
High Speed Wind Times:  45 seconds for a C-60
End of Tape Shut Off:  Fully automatic. Disengages pinch roller and heads from the cassette
Input Sensitivity/Impedance:  35 mV (0 VU)/ 50 k Ω (nominally)
Input Impedance varies with setting of Input and record Level controls from 25 k Ω to 100 k Ω
Output Level:  580 mV (at maximum, from 0 VU tape level)
Minimum Recommended Load Impedance:  2 k Ω
Distortion (tape dependent):  less than 0,1% ( up to and beyond tape saturaation)
Frequency Response: 
With Crolyn Tape :  35 - 15,000 Hz ±2 dB
With Regular Tape :  35 - 14,000 Hz ±2 dB
Signal-to-Noise Ratio (referenced to 0 VU, Dolby system off):
With Crolyn Tape :  better than 54 dB
With Regular Tape :  48 dB
Noise reduction (with Dolby system On):
10 dB at 4,000 Hz and above
9 dB at 2,400 Hz
6 dB at 1,200 Hz
3 dB at 600 Hz
Bias Frequency:  110 kHz
Power Requirements:  120 V AC, 60 Hz
Power Consumption:  25 watts