AutoVelocity™ Dynamics and the dbx 160SL

Many audio compressors employ an “Auto” mode to set the attack and release of the VCA so that the compressor will be well behaved when used in a variety of situations such as compressing vocals, piano, or program material. “Well behaved” means that pumping and breathing are minimized and that dynamic distortion, caused by low frequencies modulating the control line feeding the VCA, is not audible. The “Auto” mode works beautifully for most compression needs, however, we often need to compress signals that require a quicker attack time to catch leading edge transients such as a snare drum hit.

Many compressors on the market have manually adjustable attack and release controls to give the engineer greater creative control over how the compressor reacts to a signal. dbx compressors having manual controls include the 266/266XL, 1066, 165/165A, the MC6, and new dbx 160S/160SL. If we look at the markings around the dbx 1066 attack and release controls, we find the attack range is 3 to .04 dB/msec and the release range is 250 to 5 dB/sec. These markings may seem cryptic at first but, upon further investi- gation, we find that an attack setting of 3 dB/msec means that the VCA will reduce its gain at a rate of 3 dB for every millisecond (0.001 second) of time, or 3000 dB for every second of time. Whereas a release rate of 250 dB/sec means that the VCA will release its gain reduction at a rate of 250 dB for every second of time. These attack and release times may seem incredibly fast, but believe it or not, they are not fast enough for all compression needs. So, why not just speed up the range of the attack and release controls?

Well, let’s examine the dbx 165/165A. Her attack and release times ranges are 400 to 1 dB/msec and 4000 to 10 dB/sec respectively. Anyone who has used the 165/165A in the manual attack/release mode knows that it has an extremely wide range of control and how effective it is for compressing fast transients by dialing in a fast attack time. However, they also know how easy it is to get a “bad” sound out of the 165A if the attack and release controls are

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AutoVelocityª Dynamics and the dbx 160SL White Paper - November 1998

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dbx Pro AUTOVELOCITY DYNAMICS AND THE DBX 160SL manual AutoVelocity Dynamics and the dbx 160SL
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AUTOVELOCITY DYNAMICS AND THE DBX 160SL specifications

The dbx Pro Autovelocity Dynamics system, particularly known for its incorporation in the dbx 160SL compressor/limiter, represents a significant advancement in audio processing technology. The dbx 160SL is renowned for its ability to provide transparent dynamics control that enhances audio recordings while preserving the natural characteristics of the sound.

A standout feature of the dbx 160SL is its patented Autovelocity technology. This innovative approach allows for real-time adjustments to the threshold and ratio based on the incoming audio signal’s dynamics, providing musicians and audio engineers with unparalleled control over their sound. The result is a compression effect that responds naturally, ensuring that softer sounds are brought up without squashing the peaks, maintaining clarity and punch in the mix.

Another critical aspect of the 160SL is its comprehensive metering capabilities. Users can monitor gain reduction and input/output levels through precise LED meters that provide quick visual feedback. This feature is vital during live performances and studio sessions, as it allows for immediate adjustments to maintain optimal audio quality.

The dbx 160SL features selectable attack and release times that cater to different musical genres and preferences. Additionally, the compressor supports a range of sidechain filtering options, enabling users to emphasize or de-emphasize certain frequency ranges in the compression process. This is particularly beneficial for bass-heavy tracks or vocal recordings, where clarity is essential.

Built with durability in mind, the dbx 160SL features a robust chassis that stands up to the rigors of both studio and live environments. Its user-friendly interface makes it accessible for both novices and seasoned professionals, ensuring that anyone can achieve high-quality sound with minimal effort.

Furthermore, the 160SL's legendary dbx sound is attributed to its brilliant signal path design, which employs high-quality components that ensure low noise and high performance. The versatility of the dbx 160SL makes it a staple in both analog and digital recording setups, cementing its status as an industry-standard tool for dynamics processing.

In conclusion, the dbx Pro Autovelocity Dynamics and the dbx 160SL represent a powerful combination of innovative technology and classic audio processing techniques. Their features not only enhance audio quality but also streamline the recording and mixing process, making it easier to achieve professional sound results. With its reputation for excellence, the dbx 160SL continues to be a trusted choice for audio professionals around the world.
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