![]() The biggest impediment to having an open baffle (or dipolar) speaker perform well in a room is that the back-wave reflections (being a larger percentage of the actual sound reaching the listener) must be symmetrical from right to left. That’s why so many bipolar and dipolar speakers are designed for use with a subwoofer or are designed with specific digital signal processing designed to address bass cancellation. So, for bass frequencies, the back wave is a mixed bag. But even with the inherent frequency response issues, having the back wave in addition to the front helps cancel out some of the room resonances. ![]() This means that bass response can be very lumpy with peaks and valleys corresponding to the cancellation and reinforcement nodes. At bass frequencies, where the wavelengths are long, the front and rear waves may well cancel each other out at some frequencies and reinforce at others. However, such speakers can cause negative issues in both frequency response and in-room placement. If you’re desirous of having your music sound “bigger than the room” that you’re listening in, then these types of speakers may be for you. ![]() ![]() These back waves add perceived volume to the sound stage. With any of these designs, open-baffle, bipolar, or dipolar, there is always a front wave and a back wave, usually of equal amplitude. ![]()
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