Design Considerations

The vast majority of small near field monitors do not reproduce the low notes between 30 and 60 Hz because low frequency Inter modulation with mid range frequencies degrade clarity and imaging , therefore the low frequency range is sharply filtered out.

Most near field monitor speakers use ported enclosure to enhance bass response but the result is overhanged sustained bass transient response.

Adding a subwoofer with well designed crossover filter can eliminate these issues thus much louder SPL with low distortion can be attained.

However, most commercial subwoofers have large floor standing enclosures,  they  heavily excite room reflections and therefore poorly blend with near field monitors.

Thermoguide's small size ( 20X20X20 cm ) near field subwoofers are intended to be placed on desktop with low cost monitor speakers placed on top of them, thus perfect acoustic wave front alignment can be achieved at listener's ear height.

With desktop Near Field Subwoofers, room reflection effects are significantly mitigated. 

Our Desktop subwoofers blend well with any near field monitors by using 4th order Linkwitz Riley cross over filters at 100 or 200 Hz where the monitors are relatively flat with smooth phase shift.

By using MFB, tightly controlled bass transients can be reproduced without the over hanged  sustained response that are so common with ported enclosures.

Our Subwoofers can compliment any commercial Near Field studio monitors with the much needed bottom octave of 30-60 Hz, with superb clarity and stereo image.