Abstract: A loudspeaker structural arrangement enhancing frequency range and flatness of frequency response. The speaker enclosure has an aperture wall defining an aperture at a front portion of the enclosure. The aperture wall has an inclined inside surface sot that the aperture size varies as function of distance along an axis of the aperture. The speaker's transducer unit includes a frame having an outside surface that is inclined to generally match the inclinator of the aperture wall. So that the transducer can be force fit into the enclosure and pressed against it to firmly secure it without attachment to a flange of the transducer.