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The first 2.1 audio system from Bose was the "Lifestyle 10", which was released in 1990. The Lifestyle 10 included a single-disk CD player, an AM/FM radio and "Zone 2" RCA outputs which could be configured to output a different source to the primary speakers. A 6-disk magazine-style CD changer was introduced in 1996.
The Original 2–12 Vintage is 100 watts, whereas the 6–10 and the 1–15 are only 50 watts The original Classic was a 50 watt amp and two 12-inch speakers and a spring reverb, with two preamps for "clean" and "distortion" channels.
The 5150 was based on the Soldano SLO-100 which Eddie Van Halen was using at the time and designed to provide high gain saturation as well as a clean channel. [5]While the product was designed around a centered printed circuit board (PCB), its cascading five preamps (actually four preamplifiers and one phase inverter) and four gain stages were implemented in a very simple manner.
The relationship between perceived volume (loudness) and power output in watts of an amplifier is not a linear relationship: The human ear perceives a 50-watt amplifier as only twice as loud as a five-watt amplifier, despite a tenfold increase in power in watts. Doubling the power of an amplifier results in a "just noticeable" increase in ...
Some keyboard amps may be equipped with a compressor or limiter to protect the speaker from damage when the amplifier is being used at high volume levels. Some keyboard amps (e.g., Yorkville's 200-watt keyboard amp and Peavey's KB-4) have an extension speaker jack, which enables the amp to be connected to a second speaker cabinet for more volume.
For most audio applications more power is needed at low frequencies. This requires a high-power amplifier for low frequencies (e.g., 200 watts for 20–200 Hz band), lower power amplifier for the midrange (e.g., 50 watts for 200 to 1000 Hz), and even less the high end (e.g. 5 watts for 1000–20000 Hz).
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A genuine Signetics NE5532N in PDIP package, made in 1990, on a modem board A Texas Instruments SA5532A in SOIC package on an audio distribution amplifier board . The NE5532, also sold as SA5532, SE5532 and NG5532 (commonly called just 5532) is a dual monolithic, bipolar, internally compensated operational amplifier (op amp) for audio applications introduced by Signetics in 1979.
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