Your talking front and back loaded horn.A lowther or fostex in proper cabinet can make for a wonderfuly musical loudspeaker. They can be a bit weak at frequincy extremes but the vintage front horns you listed klipsch altec etc all sufer from this. 2 watts might not be enofe for a vintage front horn. If you have DIY skills maybe a lowther fostex would work for you. Keep in mind hi-eff just not fullranges and front horns, hi-eff ribbon loudspeakers are availible as are medium eff dynamics like audio note.
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