{"id":2362,"date":"2012-06-18T17:32:15","date_gmt":"2012-06-18T17:32:15","guid":{"rendered":"http:\/\/www.audioexcite.com\/?p=2362"},"modified":"2012-08-05T15:48:17","modified_gmt":"2012-08-05T15:48:17","slug":"sequence-three-grand-reference-construction","status":"publish","type":"post","link":"https:\/\/www.audioexcite.com\/?p=2362","title":{"rendered":"Sequence Three – Grand Reference Construction!"},"content":{"rendered":"

 <\/p>\n

Finally the driver units for the \u201cReference<\/strong>\u201d build has been chosen and delivered to me. \ud83d\ude42<\/p>\n

This is a construction which I will build in parallel with other smaller projects and I think it will take some considerable time to finish it. I have no rush into getting this \u201cReference<\/strong>\u201d loudspeaker up and running, but I will publish measurements and design thoughts here in my construction blog, along the way the design project progresses and develops.<\/p>\n

 <\/p>\n

The driver units used in the \u201cSequence Three – Grand Referenc<\/strong><\/span><\/strong>e<\/strong><\/span>\u201d 3-way loudspeaker:<\/p>\n

Tweeter:<\/strong>
\nHere I will use the RAAL 140-15D<\/strong> Ribbon Tweeter. This is a ribbon tweeter that many people regards to be one of the best ribbon tweeters on the market and it\u2019s supposed to have very low distortion compared to other ribbon tweeters. Time will tell if it\u2019s true or not and I will release extensive measurements to evaluate the claims.<\/p>\n

Mid-range:<\/strong>
\nHere I will use the AudioTechnology C-Quenze 15H-52-12-06-SDKM<\/strong>. This is the mid-range version of the 15H 5\u201d mid-woofer and it has a special rubber mid-range surround. This is the \u201cover-hung\u201d version with a Kapton voice-coil former. According to AudioTechnology the \u201cover-hung\u201d version of the mid-range has a bit more detailed mids and \u201cmonitor\u201d characteristics as well as higher sensitivity compared to the \u201cunder-hung\u201d version.<\/p>\n

Woofer:<\/strong>
\nHere I will use the AudioTechnology Flex-Units 10C-77-25-10-KAP<\/strong>. This is a 10\u201d driver with a woofer cone made from two thin carbon reinforced paper cones. The result is an extremely rigid and stiff cone. The kapton voice-coil former is laminated with aluminium foil and presents a very low mechanical resistance, which allows the driver to play bass with authority, even at low levels.<\/p>\n

 <\/p>\n

For further details see manufacturers website:
\nRAAL 140-15D Ribbon Tweeter<\/a>
\nAudioTechnology C-Quenze 15H-52-12-06-SDKM<\/a>
\nAudioTechnology Flex-Units 10C-77-25-10-KAP<\/a><\/p>\n

 <\/p>\n

Driver unit picture gallery:<\/strong><\/p>\n

\"\"<\/a>\"\"<\/a><\/p>\n

\"\"<\/a>\"\"<\/a><\/p>\n

The woofer weighs about 8.5kg and is very robustly built. It has a large ventilation hole through the centre pole piece allowing for a compression free ventilation of the voice-coil. The ventilation hole is covered by foam.<\/p>\n

 <\/p>\n

\"\"<\/a>\"\"<\/a><\/p>\n

\"\"<\/a>\"\"<\/a><\/p>\n

The mid-range has the special rubber mid-range surround with an unusual looking shape. The mid-range also has a similar ventilation of the voice-coil, as the woofer.<\/p>\n

 <\/p>\n

\"\"<\/a>\"\"<\/a><\/p>\n

All the \u201cSequence Three – Grand Reference<\/strong><\/span>” driver units showed together. Note! the huge magnet size on the woofer compared to the mid-range, which also have large magnet considering its size.<\/p>\n

Regards<\/p>\n

\/G\u00f6ran<\/p>\n","protected":false},"excerpt":{"rendered":"

  Finally the driver units for the \u201cReference\u201d build has been chosen and delivered to me. \ud83d\ude42 This is a construction which I will build in parallel with other smaller projects and I think it will take some considerable time to finish it. I have no rush into getting this \u201cReference\u201d loudspeaker up and running, […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[],"class_list":["post-2362","post","type-post","status-publish","format-standard","hentry","category-blog"],"_links":{"self":[{"href":"https:\/\/www.audioexcite.com\/index.php?rest_route=\/wp\/v2\/posts\/2362","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.audioexcite.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.audioexcite.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.audioexcite.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.audioexcite.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2362"}],"version-history":[{"count":13,"href":"https:\/\/www.audioexcite.com\/index.php?rest_route=\/wp\/v2\/posts\/2362\/revisions"}],"predecessor-version":[{"id":2378,"href":"https:\/\/www.audioexcite.com\/index.php?rest_route=\/wp\/v2\/posts\/2362\/revisions\/2378"}],"wp:attachment":[{"href":"https:\/\/www.audioexcite.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2362"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.audioexcite.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2362"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.audioexcite.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2362"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}