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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





ADS L520 loudspeakers

ADS is in a unique position to answer the needs of the discriminating music lover who is also mindful of his budget.
Among the best known of ADS two-way systems are ADS  Minature Speakers. Their introduction shocked the audio world and clearly established ADS as a leader in miniaturization technology. Miniature or not, ADS speakers have consistently delivered the greatest performance for a given enclosure volume. ADS also builds some of the most sophisticated and prestgious professional monitoring system in the world. Chosen by the most critical recording and broadcast engineers in the industry. ADS speakers have gained an enviable reputation for advanced technology, superior design, uncompromising quality, and pacesetting performance.

It should come as no surprise, therefore, that ADS produces some of the best two-way bookshelf speaker systems that money can buy. The ADS L520 (L420 and L620) are results of the very same technology which has put ADS Minispeakers at the head of their class. They incorporate many elements of the largest, most expensive ADS professional Monitor. They are designed and built with the same "old-World" care, attention to detail and quality components.

Value is getting more for your money
The  L520 (L420 and L620) offer a degree of quality and performance rarely found at any price. But don't take our word for itt. Compare their specifications, quality of construction and sonic performance to the competition. Compare the  L520 (L420 and L620) not only to other speakers of comparable size and driver complement, but also to larger, costlier speakers. Buying a similarly priced speaker simply because it is bigger or has more drivers may well prove to be false economy.
The  L520 (L420 and L620) deliver tonal accuracy, wide frequency raange, low distortion, high efficiency excellent stereo imaging, fast traansient response and wide dynamic range which set new standards for two-way speaker performance. Their advanced design, lavish construction, uncompromising manufacture and extraordinary performance ensure untiring musical entertainment and uncommon long-term value.
L 520

Specifications
Frequency Response:  35 - 20,000 Hz ±3 dB (25 - 22,000 Hz ±5 dB)
Impedance:  6 Ω (nominal), 4 Ω (minimum)
Efficiency:  92 dB SPL with 2,8 V RMS ( 1 watt) pink noise input measured at 1 m in typical listening room (2000 ft²)
Driver Complement:
HF :  1" soft dome tweeter
LF :  8" Stifflite woofer
Crossover:  1,500 Hz  12 dB/octave
Power Rating:  50 watts (nominal),  100 watts (max peak program)
Recommended Amplifier Power:  15 watts (minimum), 100 watts (maximum)
Cabinet:  Selected natural walnut over extra-high-density particle board
Baffle:  piano black finish with diffraction corrected flush driver mounting
Grille:  Acoustically transparent removable frameless grill in bronze finish.
Dimensions (Hx W x D):  21-5/8" x 12-1/4" x 10-1/2"
Weight:  14 kg (30 lbs)
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