{"version":"1.0","provider_name":"Hatena Blog","author_url":"https://blog.hatena.ne.jp/web123/","title":"Graetz Siemens Telefunken","blog_url":"https://blog123.hatenablog.jp/","author_name":"web123","url":"https://blog123.hatenablog.jp/entry/2019/01/08/165816","description":"My best loud speaker so far, Telefunken 18x26 oval unit, circa mid 1950, in open back cabinet. Baffle size is 45cm x 25cm. My initial trial was using Graetz 21x32 unit (Isophon P2132 equiv.) as full range, and I found, though it claims response up to 8kHz, I need to cut higher than 2.5kHz. Firstly, \u2026","type":"rich","categories":["Speaker"],"published":"2019-01-08 16:58:16","provider_url":"https://hatena.blog","image_url":"https://cdn-ak.f.st-hatena.com/images/fotolife/w/web123/20190108/20190108162546.jpg","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fblog123.hatenablog.jp%2Fentry%2F2019%2F01%2F08%2F165816\" title=\"Graetz Siemens Telefunken - blog123\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","height":"190","width":"100%","blog_title":"blog123"}