The sharp suckout at 390 hz is the response with the woofer phase reversed showing good phase correlation between the woofer and midrange drivers.
Floor bounce speakers.
All bookshelf speakers suffer from this because the woofer is placed high.
Another way to look at this.
Depth can vary from about nine inches to two feet.
As the name implies floorstanding speakers also referred to as tower speakers sit on the floor or an attached outrigger type stand.
The mid network is a 1st order hp followed by a 2nd.
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Maybe you hate the way audio speaker stands look.
The dip in response at 300 hz is floor bounce and can be for the most part disregarded.
Whatever the reason plenty of people place their audio speakers on the floor.
When is floor bounce a problem.
Normally they will be three feet or taller and seven inches and up in width.
The dual 5 5 inch aluminum cone woofers are low mounted to produce thundering bass while reducing floor bounce and the folded motion tweeter ensures the high frequency sounds are clear.
However for large speakers with a low cut off frequency like active 3 way main monitoring systems the distance needed to bump the cancellation frequencies below the lf cut off simply becomes too big for most listening rooms and control rooms.
But at least for me i have decided to live with my horizontal 3 way for my center channel that does not address floor bounce.
In the listening room the floor bounce overlays the entire orchestra and again the physical size of the speaker controls how diffuse the floor reflection is going to be.
Or maybe you re going for a college chic aesthetic with everything from your mattress to your tv on the floor.
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Here s why you might want to reconsider.
Floor bounce is caused by the sound that bounces off the floor between the listener and the speakers being out of phase at certain frequencies usually between 100 and 300 hz and partially canceling the direct sound causing a dip in the frequency response at those frequencies.
Speakers are described as two way three way four way etc.
With horns it gets interesting since the vertical dispersion can be quite different for different horns covering different frequency ranges leading to a floor reflection.
A 3 way gives you the opportunity to avoid the interference as mayhem13 mentioned.
The dual 5 5 inch aluminum cone woofers are low mounted to produce thundering bass while reducing floor bounce and the folded motion tweeter ensures the high frequency sounds are clear.