KResearch KR-Imager STR — Free Download

Purpose and Signal Processing

KR-Imager STR is a stereo image enhancer plugin that uses a frequency-domain engine to split the input audio into hundreds of individual frequency components. Unlike conventional time-domain designs that use a few bands, this approach enables highly detailed expansion of the stereo field. The plugin operates on the Spectral Transformation Resynthesis (STR) platform, which is full-bandwidth, alias-free, and linear, allowing effect processing without adding coloration.

The output remains spectrally neutral, meaning the original frequency balance is preserved. The plugin only widens the stereo image for a more spacious sound. It can process mono signals to create a stereo image, as well as enhance existing stereo material by further widening the soundstage. An input channel selector lets you choose left, right, or both channels for processing.

Key Capabilities: Sweep and Morph

Two stereo image animation methods are central to KR-Imager STR. The algorithmic sweep method allows the selected algorithm to change the frequency response bands over time according to a user-specified rate, creating a dynamic, evolving stereo effect. The morph method combines two different algorithms in real time, based on a user-defined rate, enabling smooth transitions between distinct spatial characteristics.

Both methods can be used individually or concurrently, providing a rich variety of stereo imaging possibilities. A freeze morph function captures a specific morph state, letting you hold a particular blend for consistent processing. Controls include primary and secondary algorithm selection, effect depth, sweep speed, morph enable, morph speed, and a morph algorithm mix for the frozen state.

Workflow and Controls

The plugin’s controls are designed for intuitive real-time adjustment. You start by selecting a primary algorithm and, if desired, a secondary algorithm for morphing. The depth control sets the overall effect intensity, while the sweep speed determines how quickly the algorithm sweeps through frequency bands. For morphing, enable the morph function, set the morph speed, and adjust the mix between the two algorithms.

The freeze morph control lets you lock a specific morph blend, useful for maintaining a consistent sound. The input selector allows you to process the left, right, or both channels, giving flexibility for mono sources or targeted enhancement. Because the engine operates in the frequency domain, changes are applied smoothly without aliasing, making it suitable for detailed audio work.

Practical Applications and Limitations

KR-Imager STR is suitable for widening mono tracks to create a stereo presence, such as for vocals, guitars, or synthesizers. It can also enhance existing stereo mixes by expanding the soundstage without introducing frequency coloration, which is beneficial for bus processing or mastering. The sweep and morph animations add movement and interest, ideal for creative sound design or ambient textures.

The plugin does not include any preset management or metering features, so you must rely on your ears for adjustment. There is no integrated bypass or A/B comparison, so external bypass or a DAW’s native feature may be needed for quick comparison. The plugin requires a host that supports the chosen plugin format, but no specific system requirements are stated in the source.

Key features

• Frequency-domain engine with hundreds of spectral components
• Full-bandwidth, alias-free, linear STR DSP platform
• Sweep and morph stereo animation methods, usable separately or together
• Freeze morph function to hold a specific algorithm blend
• Primary and secondary algorithm selection, depth, and rate controls
• Left, right, or both input channel selection
• Spectral neutral output preserving original frequency balance

Best for

Best for musicians, producers, and sound designers needing a detailed stereo widener that preserves spectral integrity. It excels at animating mono sources into dynamic stereo fields or enhancing existing stereo mixes with movement, without unwanted coloration.