![]() ![]() We finally tested "KEANE - Hopes And Fears" CD Track #1 called "Somewhere Only We Know". That's 37.5% lower than its rated output! ![]() Fig 2 shows the average output was only 1.25V RMS with peaks up to 1.9V for the entire duration of the song. We then tested our "VOLUME - Under Pressure" CD Track #3 called "Let It Drop". After we determine the volume level needed to produce an unclipped signal, we'll retain this position for the next two tests. Fig 1 shows the radio's maximum unclipped output (measured with a 1kHz 0dB test tone) was 2.1V RMS, so it exceeded its specification. We tested a Panasonic CQ-RX400U rated at 2.0V RMS at the preamp outputs (RCA jacks). Say for example, if you have a 4V source unit - the myth is - the radio produces 4V all the time. A common misconception is that source units always produce their rated output voltage as printed on their specification page. Many quality units provide 2 Volts or more at the RCA outputs. Since a source unit is the starting point of our audio signal, it's important to select a model that has a good preamplifier output, most importantly low "output impedance" and solid "output voltage". Adjusting the throttle so our hot-rod idles at the proper RPM will - in effect - optimize the "dynamic range" of your gas pedal. Where the carburetor is "set" doesn't affect how much horsepower the engine can generate, just the effort needed to drive the engine to its full potential. Conversely, if our carburetor adjustment is decreased, the engine will "idle" low and it will take maximum gas pedal travel to get the engine up to its 300 HP potential. If our carburetor adjustment is increased, the engine will "idle" high and it will take minimal gas pedal travel to get the engine up to its 300 HP potential. Let's also assume our hot-rod can produce up to 300 horsepower (HP). In a metaphor, let's equate the gain control to the throttle adjustment on a carburetor, and the source unit's volume knob to a gas pedal. A gain adjustment's primary purpose is to match the output voltage of the source unit to the input circuit of the amplifier. Gain adjustments are typically found on amplifiers that control the sensitivity of the input circuit (signal processors use a level adjustment that controls the amplitude of the output circuit). By definition, "Dynamic Range" is the ratio of the loudest to faintest sounds reproduced without significant distortion, expressed in decibels (dB). Set of 12 Gain Overlap Tracks Above (*.wav)Ī car audio system can have its dynamic range greatly improved by simply adjusting system gains. Set of 12 Gain Overlap Tracks Above (*.mp3) Set of 12 Gain Overlap Tracks Above (*.m4a) If you are burning a CD-ROM, be sure to burn the disc at the highest quality available.ĤkHz with 0 dB gain overlap for use with tweetersġkHz with 0 dB gain overlap for use with midrangeĤ0Hz with 0 dB gain overlap for use with woofersĤkHz with 5 dB gain overlap for use with tweetersġkHz with 5 dB gain overlap for use with midrangeĤ0Hz with 5 dB gain overlap for use with woofersĤkHz with 10 dB gain overlap for use with tweetersġkHz with 10 dB gain overlap for use with midrangeĤ0Hz with 10 dB gain overlap for use with woofersĤkHz with 15 dB gain overlap for use with tweetersġkHz with 15 dB gain overlap for use with midrangeĤ0 Hz with 15 dB gain overlap for use with woofersĢ At 0dB there is no clipping distortion and therefore THD will fallback on the amplifeir's rated THD specification. You can play these tracks directly from a laptop or mobile device if your source unit has an Auxiliary (AUX) Input. When downloading/importing these tracks, be sure to use the highest quality encoding possible. The tracks used to properly set gain overlap are available for download below. NOTE: This article is a companion to " DIY Distortion Meter". It sounds good, but are you getting the most out of your system? By properly adjusting your system gains, the Sound Quality (SQ) and/or Sound Pressure Level (SPL) can be greatly optimized. You meticulously selected the right products for your car audio system, installed them, and finally connected them together. ![]()
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