Ask the Doctors

The UAD 4K Channel Strip and Buss Compressor

Posted by Dr. Dave Berners on April 22, 2009 11:11:11 AM PDT

The UAD 4K is an emulation of the SSL 4000 channel strip, which comprises high and low cut filters, four-band EQ, compression, and expansion/gating. The buss compressor is modeled after the SSL 4000 buss compressor. It features feedback topology, VCA-controlled gain, a wide range of attack and release times, and an “Auto” release mode with program dependence. Compression ratios are also selectable.

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33609 Warmth

Posted by Dr. Dave Berners on March 25, 2009 11:11:11 AM PDT

Q: Does the Neve 33609 plug-in include a model for saturation in the circuit, or is the signal distorted only due to the action of the compressor?

A: There has been much debate among users on this topic. The 33609 plug-in does model distortion in the audio path separately from distortion caused by gain modulation.

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Total Harmonic Distortion

Posted by Dave Berners on January 21, 2009 8:00:00 PM PST

Q: What is THD and how is it measured?

THD stands for Total Harmonic Distortion and can be used to estimate the degree to which a system is nonlinear. A THD measurement can be made by applying a sine wave as an input to a system, and measuring the total energy which appears at the output of the system at harmonics of the input frequency.

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Flangers and Phasers

Posted by Dr. Dave Berners on December 24, 2008 11:11:11 AM PST

Q: What is the difference between a flanger and a phaser?

A: Flangers and phasers are fundamentally the same thing: an element that creates time-varying phase delay, surrounded by feedback. Figure 1, below, shows a block diagram for a flanger or phaser. The phase-delay element can be viewed generically as an all-pass filter; this element is a linear system that has unity gain at all frequencies.

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Allpass Filters

Posted by Dave Berners on November 19, 2008 11:11:11 AM PST

Q: What are allpass filters and what are they used for?

A: Allpass filters are filters that have what we call a flat frequency response; they neither emphasize nor de-emphasize any part of the spectrum. Rather, they displace signals in time as a function of frequency. The time displacement accomplished by an allpass filter is specified by its phase response. 

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Circuit Emulation in Software

Posted by Dr. Dave Berners on September 24, 2008 11:12:11 AM PDT

Emulation of continuous-time systems can be broken into two distinct problems. First, a model must be constructed that characterizes the system suitably; second, a discrete-time implementation must be created that will faithfully represent the model. Depending on the system to be emulated, either the first or second part of the process can be the more challenging. We will treat the two parts separately here.

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Cut Filters

Posted by Dr. Dave Berners on August 20, 2008 11:11:11 AM PDT

Q: What is the difference between the cut-filter types in the Cambridge EQ?


A: Cambridge includes the following cut-filter types: coincident-pole, Bessel, Butterworth, and Elliptic. Let's examine each of these types.

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Inside the 710 Twin-Finity

Posted by Si Moorehead on July 23, 2008 4:01:00 PM PDT

The 710 Twin-Finity is an all-new preamp design featuring both tube and solid-state preamps and the ability to blend between the two. The solid-state section is all new and uses the latest technology available, resulting in an audio image with exceptional clarity and transient response. It is very open and true to the source audio.

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