{"id":82,"date":"2017-07-07T14:18:26","date_gmt":"2017-07-07T12:18:26","guid":{"rendered":"http:\/\/soundoddity.com\/blog\/?p=82"},"modified":"2023-05-05T17:03:37","modified_gmt":"2023-05-05T15:03:37","slug":"about-the-amazing-apm-66es","status":"publish","type":"post","link":"https:\/\/soundoddity.com\/blog\/about-the-amazing-apm-66es\/","title":{"rendered":"About the amazing Sony APM-66ES"},"content":{"rendered":"

Presentation<\/strong><\/h1>\n

After the Sony APM-8<\/a>, Sony APM-6<\/a>, Sony APM-4<\/a>, Sony APM-77W<\/a>, Sony APM-55W<\/a> and Sony APM-33W<\/a>, came the Sony APM-66ES<\/a> and the Sony APM-22ES<\/a>.<\/p>\n

The Sony APM-66ES are the last high-end APM speakers to have been made, the last series with all the latest technologies. You will find the ES version, the ESMKII (with black speakers and a closed, acoustic suspension box) and finally the ESG version (with regular conical midranges and dome tweeters but keeping the APM technologie for the woofers).<\/p>\n

For those who are not aware of this, APM stands for \u201cAccurate Pistonic Motion\u201d. It is linked to the way of driving a flat square diaphragm. Sony engineers wanted to think out of the box and to create something different and performing, using the new available technologies of the seventies. They found out that a flat and rigid square diaphragm drove in at least 4 points was the best design to avoid split vibration and have the breakup frequency much higher with a distortion level much lower on the whole spectrum.<\/p>\n

About the woofers :<\/strong><\/p>\n

The 66ES could be compared to the Sony APM-55W in terms of dimensions but in fact they share not much thing with them except for the same woofer\u2019s diaphragm\u2019s surface area.<\/p>\n