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Voltage vs. time of sine waves at reference and line levels, with V RMS, V PK, and V PP marked for the +4dBu line level. A line level describes a line's nominal signal level as a ratio, expressed in decibels, against a standard reference voltage. The nominal level and the reference voltage against which it is expressed depend on the line level ...
The sound company Tycobrahe, known for supporting large rock festivals such as California Jam, offered an active direct box for sale in 1977 capable of +9 dBm line level output with a built-in attenuator to compensate for various input levels. [4] [5]
A microphone preamplifier increases that level by up to 70 dB, to anywhere up to 10 volts. This stronger signal is used to drive equalization circuitry within an audio mixer , to drive external audio effects, and to sum with other signals to create an audio mix for audio recording or for live sound .
In an audio system, they are typically used to amplify signals from analog sensors to line level. The second amplifier is typically a power amplifier (power amp). The preamplifier provides voltage gain (e.g., from 10 mV to 1 V) but no significant current gain. The power amplifier provides the higher current necessary to drive loudspeakers.
NAD 3020 integrated amplifier. The NAD 3020 is a stereo integrated amplifier by NAD Electronics, considered to be one of the most important components in the history of high fidelity audio. [1]
SB-10000 Loudspeaker: Top of the line Technics speaker at a cost of US$12,000. They featured a tweeter made of boron. A used pair sold for US$32,050 around 2010 in Germany. SE-A1 Amp: Top of the line Technics amp at a cost of US$6,000. SU-A2 Pre-Amp: Top of the line for Technics at a cost of US$8,000.
As more modern designs omitted the phonograph inputs, add-on phono preamplifiers with the RIAA equalization curve have become available. These adapt a magnetic phono cartridge to an unbalanced −10 dBv consumer line-level RCA input. Some modern turntables feature built-in preamplification to the RIAA standard.
Phase Linear 700 Amplifier, Phase Linear 350 Amplifier, C4000 Preamp Phase Linear was an audio equipment manufacturer founded by Bob Carver and Steve Johnston in 1970. While primarily known as a power amplifier company it also produced several innovative preamplifiers, tuners and the Andromeda loudspeaker.