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  2. Subwoofer - Wikipedia

    en.wikipedia.org/wiki/Subwoofer

    An unusual example of manifold subwoofer design is the Thomas Mundorf (TM) approach of having four subwoofers facing each other and sitting close together, which is used for theater in the round shows, where the audience surrounds the performers in a big circle (e.g. Metallica has used this in some concerts).

  3. Double bass array - Wikipedia

    en.wikipedia.org/wiki/Double_Bass_Array

    A DBA requires at least two subwoofers (preferably same make and model) that are placed at opposing walls in a specific layout. The signal played by the subwoofer array on the back wall is inverted and delayed based on the distance to the frontal subwoofer array. This will actively "absorb" any reflected sound.

  4. Stiefel manifold - Wikipedia

    en.wikipedia.org/wiki/Stiefel_manifold

    The Stiefel manifold can be equipped with a uniform measure, i.e. a Borel measure that is invariant under the action of the groups noted above. For example, V 1 ( R 2 ) {\displaystyle V_{1}(\mathbb {R} ^{2})} which is isomorphic to the unit circle in the Euclidean plane, has as its uniform measure the natural uniform measure ( arc length ) on ...

  5. List of manifolds - Wikipedia

    en.wikipedia.org/wiki/List_of_manifolds

    Einstein manifold. Ricci-flat manifold. G2 manifold. Kähler manifold. Calabi–Yau manifold. Hyperkähler manifold. Quaternionic Kähler manifold. Riemannian symmetric space. Spin (7) manifold.

  6. Manifold - Wikipedia

    en.wikipedia.org/wiki/Manifold

    A manifold with boundary is a manifold with an edge. For example, a sheet of paper is a 2-manifold with a 1-dimensional boundary. The boundary of an -manifold with boundary is an ()-manifold. A disk (circle plus interior) is a 2-manifold with boundary.

  7. Isobaric loudspeaker - Wikipedia

    en.wikipedia.org/wiki/Isobaric_loudspeaker

    Isobaric loudspeaker. An isobaric loudspeaker is a loudspeaker in which two or more identical woofers (bass drivers) operate simultaneously, with a common body of enclosed air adjoining one side of each diaphragm. They are most often used to improve low-end frequency response without increasing cabinet size, though at the expense of cost and ...

  8. Symplectic manifold - Wikipedia

    en.wikipedia.org/wiki/Symplectic_manifold

    Symplectic manifolds arise from classical mechanics; in particular, they are a generalization of the phase space of a closed system. [1] In the same way the Hamilton equations allow one to derive the time evolution of a system from a set of differential equations, the symplectic form should allow one to obtain a vector field describing the flow of the system from the differential of a ...

  9. Einstein manifold - Wikipedia

    en.wikipedia.org/wiki/Einstein_manifold

    The classical uniformization theorem for Riemann surfaces guarantees that there is such a metric in every conformal class on any 2-manifold. Any manifold with constant sectional curvature is an Einstein manifold—in particular: Euclidean space, which is flat, is a simple example of Ricci-flat, hence Einstein metric.

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