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Thermoguide Ltd is a sound engineering company focused on small Nearfield Desktop Subwoofers .
We use Motion FeedBack ( MFB) technology to create 20X20X20 cm powerful subwoofers that are flat from 30 to 300 Hz.
With our built in Linkwitz Riley crossover these subwoofers can perfectly blend with any studio monitors..
Two such subwoofers can be placed desktop with two monitors on top of them thus perfect acoustic wavefront
alignment can be achieved at listener's ear height.
Visit www.servobass.com
We use Motion FeedBack ( MFB) technology to create 20X20X20 cm powerful subwoofers that are flat from 30 to 300 Hz.
With our built in Linkwitz Riley crossover these subwoofers can perfectly blend with any studio monitors..
Two such subwoofers can be placed desktop with two monitors on top of them thus perfect acoustic wavefront
alignment can be achieved at listener's ear height.
Visit www.servobass.com
Motion Feed Back enables Small Subwoofers
Frequency response of a woofer in a small sealed enclosure is resonant. This is a simple physical fact leading to sustained, over hanged, "Slow" bass response.
No equalizer can fix that!!
However, adding an accelerometer bonded to that woofer's Voice Coil with Motion
Feed Back can suppress that resonance to yield "Fast", tightly controlled
Bass transients.
Other benefits are extended and flat frequency response, reduced distortion while using a very small enclosure.
The plots bellow were taken with a 6.5 Inch long throw driver in a sealed 20x20x20 cm enclosure (4 liters internal air volume!!)
Red plot is without Motion Feedback. Blue plot is with Motion Feedback.
Thermoguide's MFB technology was successfully implemented in our Desktop Subwoofers to add powerful base notes down to 25 Hz to small studio monitors that were placed on top of them.
By using near field subwoofers at listener's ear height, room reflection effects are minimized.
Perfect wave front match can be attained at the crossover frequency yielding superb clarity and stereo image.
This is a unique setup intended to be used in home and small recording studios.
visit ww.servobass.com for more information .
These days Thermoguide is focused on implementing our MFB technology for under the seat car subwoofers and for Home theater Sound Bars.
Thermoguide is interested in cooperation with speaker manufacturers to bring our technology to the consumer market.
visit ww.servobass.com for more information and let me know this is interesting to you.
Zami Schwartzman , CEO
Thermoguide Ltd
972-547251937
zamisch1@gmail.com
Frequency response of a woofer in a small sealed enclosure is resonant. This is a simple physical fact leading to sustained, over hanged, "Slow" bass response.
No equalizer can fix that!!
However, adding an accelerometer bonded to that woofer's Voice Coil with Motion
Feed Back can suppress that resonance to yield "Fast", tightly controlled
Bass transients.
Other benefits are extended and flat frequency response, reduced distortion while using a very small enclosure.
The plots bellow were taken with a 6.5 Inch long throw driver in a sealed 20x20x20 cm enclosure (4 liters internal air volume!!)
Red plot is without Motion Feedback. Blue plot is with Motion Feedback.
Thermoguide's MFB technology was successfully implemented in our Desktop Subwoofers to add powerful base notes down to 25 Hz to small studio monitors that were placed on top of them.
By using near field subwoofers at listener's ear height, room reflection effects are minimized.
Perfect wave front match can be attained at the crossover frequency yielding superb clarity and stereo image.
This is a unique setup intended to be used in home and small recording studios.
visit ww.servobass.com for more information .
These days Thermoguide is focused on implementing our MFB technology for under the seat car subwoofers and for Home theater Sound Bars.
Thermoguide is interested in cooperation with speaker manufacturers to bring our technology to the consumer market.
visit ww.servobass.com for more information and let me know this is interesting to you.
Zami Schwartzman , CEO
Thermoguide Ltd
972-547251937
zamisch1@gmail.com
Last edited by a moderator:
Uh? An equalizer absolutely can fix frequency response. This needs more supportive data, like GD/decay curves to show what´s up. Of course feedback is superior, but those are some vague bold statements. 🙂
Thermoguide is a one man operation ( me). Currently I do not sell anything but I plan to sell accelerometers and MFB amplifiers to individuals interested in MFB subwoofer DIY .
I will be glad to discuss technical issues related to MFB subwoofers, I have done lots of work on this subject. My first prototype was 25 years ago, it blended perfectly with my DIY Electrostatic panels.
In the last 3 years I focused on MFB for desktop subs in home studios with some very successful prototypes.
So yes, I am a DIY er for many years and yes , I will try to commercialize my protos and also help DIY ers with hardware and advice.
Well, an EQ can fix freq response for a while, but when the voice coil heats up to 125 deg C which is common with closed enclosures, it's resisrance doubles, SPL get compressed damping factor degrades and guess what this does to the freq response. Add aging of soft materials to the equation and you get to why I say by "No eq can fix that ".
A good accelerometer in the loop mitigate all these issues yielding flat freq respose down to 25 Hz or lower , fast transient decay, reduced distortion and thermal compression. All that with long term stability.
With MFB, any robust driver can be used in a small enclosure, you don't have to care about Thiel Small equations because the feedback loop parameters domonate.
In PA, that is rather mild working state. 🙂 Equaliser absolutely can solve this, as modern PA is often setup by microphone, and best after warmup or quick burst in the middle of production on breaktime. I get what you mean, it is better way. It´s just that worse ways still are workable, and it doesn´t have to be that "night and day" outcome.