DDMF – GrandEQ for WiN

What is it?

Of all the DDMF equalizers, GrandEQ certainly has the most advanced DSP algorithms. The goal of developing a digital equalizer is always to reduce the amount of digital artifacts introduced due to the inevitably limited sampling rate. As with everything else in life, the last few percent of optimization is the most difficult, so a lot of effort has been put into creating an equalizer that would cause the least amount of damage to your audio material.

With its minimum phase setting, GrandEQ achieves this to a greater extent than most other equalizers, both in the amplitude and phase domains, while keeping latency very low. The result is a very open and clear sound with excellent processor performance. Its linear phase setting is fully preserved in the time domain, using a carefully designed time-shifting algorithm and 2x oversampling to ensure excellent amplitude and (flat) phase response with the lowest possible amount of digital distortion.

Alternative user interface

Grande comes with two alternative interfaces, the second of which is a minimalist approach that allows you to focus even more on just the sound, without any visual distractions. You can switch between the two interfaces with a single click, and your last choice will be remembered whenever you open GrandEQ again.

Matched Amplitude and Phase Response: Comparison

To further clarify what is meant by accurate magnitude and phase response, let’s consider a bell filter (+9 dB at 10 kHz). Looking at the magnitude response of the GrandEQ (shown in red in the following figure), notice that it so closely matches the true analog response (yellow) that it is barely noticeable below 20 kHz. Both the standard digital equalizer (blue) and the digital equalizer with descrambler (green) show clear differences in the higher frequency range.

This excellent behavior also extends to the phase domain: while all software equalizers eventually show a phase response of 0 at half the sampling rate (Nyquist), GrandEQ manages to follow the analog curve completely up to >20 kHz, while the other two equalizers clearly show a different response.

Peculiarities

• Minimum Phase Algorithm: Accurate amplitude and phase matching to analog targets
  
• Linear Phase Algorithm: Forward-Reverse approach + oversampling
  
• 7 independent bands with 7 different band types: Bell, Low Shelf,
  High Shelf, Low Notch, High Notch, Band-Pass and Notch
  
• with two internal modes (A/B) for quick switching between alternative settings
  
• Left-to-right or middle control
  
• Dual-channel EQ that can be plugged in/out
  
• Two different user interface styles to choose from