{"id":4874,"date":"2014-12-14T14:59:57","date_gmt":"2014-12-14T14:59:57","guid":{"rendered":"http:\/\/www.audioexcite.com\/?page_id=4874"},"modified":"2014-12-14T19:07:32","modified_gmt":"2014-12-14T19:07:32","slug":"scanspeak-18w8545-00","status":"publish","type":"page","link":"https:\/\/www.audioexcite.com\/?page_id=4874","title":{"rendered":"ScanSpeak 18W\/8545-00"},"content":{"rendered":"<h3><span style=\"color: #3366ff;\">Overview:<\/span><\/h3>\n<p>&nbsp;<\/p>\n<p>The 18W\/8545-00 is an 8\u03a9 mid-woofer from the ScanSpeak Classic series.<a href=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2015\/12\/18W-8545-00_Pic2.jpg\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" class=\"alignright wp-image-4877\" src=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2015\/12\/18W-8545-00_Pic2.jpg\" alt=\"18W-8545-00_Pic2\" width=\"200\" height=\"274\" srcset=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2015\/12\/18W-8545-00_Pic2.jpg 674w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2015\/12\/18W-8545-00_Pic2-219x300.jpg 219w\" sizes=\"auto, (max-width: 200px) 100vw, 200px\" \/><\/a><\/p>\n<p>It&#8217;s based on a design from the late 90ies and is still used in many commercial designs. It uses an air dried Paper\/Carbon Fibre cone which is stiff, but without the associated severe cone break-ups of the usual stiff cone drivers.<\/p>\n<p>The patented SD-1 magnet system is designed to almost eliminate modulation and dynamic distortion, whilst the low loss linear suspension and rubber surround combines dynamic linearity and low colouration.<\/p>\n<p>The 42mm voice-coil has an aluminium voice-coil former.<\/p>\n<p><strong>Key features:<\/strong><\/p>\n<ul>\n<li>Patented Symmetrical Drive Motor Design<\/li>\n<li>Air Dried Paper\/Carbon Fibre Cone<\/li>\n<li>42mm Voice Coil w. Alu foil<\/li>\n<li>Low-Loss linear suspension<\/li>\n<li>Low Damping SBR Rubber Surround<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p>The 18W\/8545-00 is about to be discontinued and is replaced by the updated 18W\/8545-01 version.<\/p>\n<p>ScanSpeak Spec sheet: <a href=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2011\/10\/18w-8545-00.pdf\">18W\/8545-00<\/a><\/p>\n<p>&nbsp;<\/p>\n<h3><span style=\"color: #3366ff;\">T\/S Parameters:<\/span><\/h3>\n<p>&nbsp;<\/p>\n<p><a href=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2015\/12\/T-S-parameters-18W8545-00.jpg\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-4880\" src=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2015\/12\/T-S-parameters-18W8545-00.jpg\" alt=\"T-S parameters 18W8545-00\" width=\"600\" height=\"472\" srcset=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2015\/12\/T-S-parameters-18W8545-00.jpg 673w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2015\/12\/T-S-parameters-18W8545-00-300x235.jpg 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/a><\/p>\n<p>Good consistency between the two tested driver unit samples. About 20% higher resonace frequency than the Manufacturer specification.<\/p>\n<h3><span style=\"color: #3366ff;\">Impedance:<\/span><\/h3>\n<p><a href=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2015\/12\/18W-8545-00-Imp-1L-vs-2R.jpg\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-4882\" src=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2015\/12\/18W-8545-00-Imp-1L-vs-2R.jpg\" alt=\"18W-8545-00 -- Imp 1L vs 2R\" width=\"720\" height=\"405\" srcset=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2015\/12\/18W-8545-00-Imp-1L-vs-2R.jpg 1366w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2015\/12\/18W-8545-00-Imp-1L-vs-2R-300x168.jpg 300w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2015\/12\/18W-8545-00-Imp-1L-vs-2R-1024x575.jpg 1024w\" sizes=\"auto, (max-width: 720px) 100vw, 720px\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<p>The two tested driver unit samples measures identical. A small wrinkle in the impedance plot can be seen around 900Hz.<\/p>\n<h3><span style=\"color: #3366ff;\">Frequency:<\/span><\/h3>\n<p>&nbsp;<\/p>\n<p><strong>Frequency measurement conditions:<\/strong><\/p>\n<p>The mid-woofer is measured mounted on a baffle in an 19 liter closed enclosure with the following conditions:<\/p>\n<p><strong>Baffle size (WxH):<\/strong> 24\u00d735cm with 18mm round-over on the baffle edges (r=18).<br \/>\n<strong>Driver position:<\/strong> Mounted on center-line with driver unit center 22,4cm from the top of the baffle.<br \/>\n<strong>Mic position:<\/strong> 1m distance, on mid-woofer-axis.<br \/>\n<strong>Smoothing:<\/strong> 1\/24 octave smoothing applied.<\/p>\n<p><a href=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2015\/12\/18W-8545-00-Freq-0deg-1L-vs-2R-jpg.jpg\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-4883\" src=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2015\/12\/18W-8545-00-Freq-0deg-1L-vs-2R-jpg.jpg\" alt=\"18W-8545-00 Freq 0deg 1L vs 2R jpg\" width=\"360\" height=\"122\" srcset=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2015\/12\/18W-8545-00-Freq-0deg-1L-vs-2R-jpg.jpg 1117w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2015\/12\/18W-8545-00-Freq-0deg-1L-vs-2R-jpg-300x101.jpg 300w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2015\/12\/18W-8545-00-Freq-0deg-1L-vs-2R-jpg-1024x345.jpg 1024w\" sizes=\"auto, (max-width: 360px) 100vw, 360px\" \/><\/a><a href=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2015\/12\/18W-8545-00-Freq-15deg-1L-vs-2R.jpg\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-4884\" src=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2015\/12\/18W-8545-00-Freq-15deg-1L-vs-2R.jpg\" alt=\"18W-8545-00 Freq 15deg 1L vs 2R\" width=\"360\" height=\"122\" srcset=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2015\/12\/18W-8545-00-Freq-15deg-1L-vs-2R.jpg 1117w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2015\/12\/18W-8545-00-Freq-15deg-1L-vs-2R-300x101.jpg 300w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2015\/12\/18W-8545-00-Freq-15deg-1L-vs-2R-1024x345.jpg 1024w\" sizes=\"auto, (max-width: 360px) 100vw, 360px\" \/><\/a><\/p>\n<p>(click on picture to zoom)<\/p>\n<p><strong>Left:<\/strong> Frequency response on-axis (Blue=sample#1 Red=sample#2).<br \/>\n<strong>Right:<\/strong> Frequency response 15deg off-axis (Blue=sample#1, Red=sample#2).<\/p>\n<p>The two mid-woofer samples measures virtually the same. The broad hump between 500 and 100Hz is due to the effects of the test enclosure&#8217;s baffle step.<\/p>\n<p><a href=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2015\/12\/18W-8545-00-Freq-0-15-22.5deg.jpg\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-4886\" src=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2015\/12\/18W-8545-00-Freq-0-15-22.5deg.jpg\" alt=\"18W-8545-00 Freq 0-15-22.5deg\" width=\"720\" height=\"243\" srcset=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2015\/12\/18W-8545-00-Freq-0-15-22.5deg.jpg 1117w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2015\/12\/18W-8545-00-Freq-0-15-22.5deg-300x101.jpg 300w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2015\/12\/18W-8545-00-Freq-0-15-22.5deg-1024x345.jpg 1024w\" sizes=\"auto, (max-width: 720px) 100vw, 720px\" \/><\/a><\/p>\n<p>0deg = Blue<br \/>\n15deg = Red<br \/>\n22.5deg = Green<\/p>\n<p><a href=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2015\/12\/18W-8545-00-Freq-30-45-60deg.jpg\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-4887\" src=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2015\/12\/18W-8545-00-Freq-30-45-60deg.jpg\" alt=\"18W-8545-00 Freq 30-45-60deg\" width=\"720\" height=\"243\" srcset=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2015\/12\/18W-8545-00-Freq-30-45-60deg.jpg 1117w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2015\/12\/18W-8545-00-Freq-30-45-60deg-300x101.jpg 300w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2015\/12\/18W-8545-00-Freq-30-45-60deg-1024x345.jpg 1024w\" sizes=\"auto, (max-width: 720px) 100vw, 720px\" \/><\/a><\/p>\n<p>30deg = Blue<br \/>\n45deg = Red<br \/>\n60deg = Green<\/p>\n<p>The mid-woofer starts to roll-off at 2.5kHz and a good start for a x-over cross-over point would be somewhere around 1.8-2.2kHz.<\/p>\n<h3><span style=\"color: #3366ff;\">Distortion:<\/span><\/h3>\n<p>&nbsp;<\/p>\n<p><strong>Measurement setup:<\/strong><\/p>\n<ul>\n<li>Mid-woofer near-field measurement at 15cm<\/li>\n<li>Frequency Range Mid-woofer: 200-10000Hz<\/li>\n<li>Baffle size WxH: 24\u00d735cm<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p>The distortion measurements are done in near-field and the amplifier output level was adjusted for each driver so that the fundamental is 90dB and 95dB at 1m. This setting simulates medium-high and high listening levels.<\/p>\n<p><a href=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2015\/12\/18W8545-00-1L-15cm-90db.jpg\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-4889\" src=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2015\/12\/18W8545-00-1L-15cm-90db.jpg\" alt=\"18W8545-00-1L--15cm 90db\" width=\"360\" height=\"207\" srcset=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2015\/12\/18W8545-00-1L-15cm-90db.jpg 1234w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2015\/12\/18W8545-00-1L-15cm-90db-300x172.jpg 300w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2015\/12\/18W8545-00-1L-15cm-90db-1024x590.jpg 1024w\" sizes=\"auto, (max-width: 360px) 100vw, 360px\" \/><\/a><a href=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2015\/12\/18W8545-00-2R-15cm-90db.jpg\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-4890\" src=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2015\/12\/18W8545-00-2R-15cm-90db.jpg\" alt=\"18W8545-00-2R--15cm 90db\" width=\"360\" height=\"207\" srcset=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2015\/12\/18W8545-00-2R-15cm-90db.jpg 1234w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2015\/12\/18W8545-00-2R-15cm-90db-300x172.jpg 300w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2015\/12\/18W8545-00-2R-15cm-90db-1024x590.jpg 1024w\" sizes=\"auto, (max-width: 360px) 100vw, 360px\" \/><\/a><\/p>\n<p>(click on picture to zoom)<\/p>\n<p><strong>90dB @ 1m<\/strong><\/p>\n<p>Left = Sample #1<\/p>\n<p>Right = Sample #2<\/p>\n<p><a href=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2015\/12\/18W8545-00-1L-15cm-95db.jpg\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-4891\" src=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2015\/12\/18W8545-00-1L-15cm-95db.jpg\" alt=\"18W8545-00-1L--15cm 95db\" width=\"360\" height=\"207\" srcset=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2015\/12\/18W8545-00-1L-15cm-95db.jpg 1234w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2015\/12\/18W8545-00-1L-15cm-95db-300x172.jpg 300w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2015\/12\/18W8545-00-1L-15cm-95db-1024x590.jpg 1024w\" sizes=\"auto, (max-width: 360px) 100vw, 360px\" \/><\/a><a href=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2015\/12\/18W8545-00-2R-15cm-95db.jpg\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-4892\" src=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2015\/12\/18W8545-00-2R-15cm-95db.jpg\" alt=\"18W8545-00-2R--15cm 95db\" width=\"360\" height=\"207\" srcset=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2015\/12\/18W8545-00-2R-15cm-95db.jpg 1234w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2015\/12\/18W8545-00-2R-15cm-95db-300x172.jpg 300w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2015\/12\/18W8545-00-2R-15cm-95db-1024x590.jpg 1024w\" sizes=\"auto, (max-width: 360px) 100vw, 360px\" \/><\/a><\/p>\n<p>(click on picture to zoom)<\/p>\n<p><strong>95dB @ 1m<\/strong><\/p>\n<p>Left = Sample #1<\/p>\n<p>Right = Sample #2<\/p>\n<p>Overall this is a low distorting mid-woofer. We have an elevated second-order harmonics between 0-7-1.5kHz, but the odd-order distortion profile is low throughout the frequency range.<\/p>\n<p>For such an old design this is a respectable performance and it can still compete with modern mid-woofer designs.<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview: &nbsp; The 18W\/8545-00 is an 8\u03a9 mid-woofer from the ScanSpeak Classic series. It&#8217;s based on a design from the late 90ies and is still used in many commercial designs. It uses an air dried Paper\/Carbon Fibre cone which is stiff, but without the associated severe cone break-ups of the usual stiff cone drivers. The [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-4874","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.audioexcite.com\/index.php?rest_route=\/wp\/v2\/pages\/4874","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.audioexcite.com\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.audioexcite.com\/index.php?rest_route=\/wp\/v2\/types\/page"}],"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=4874"}],"version-history":[{"count":6,"href":"https:\/\/www.audioexcite.com\/index.php?rest_route=\/wp\/v2\/pages\/4874\/revisions"}],"predecessor-version":[{"id":4893,"href":"https:\/\/www.audioexcite.com\/index.php?rest_route=\/wp\/v2\/pages\/4874\/revisions\/4893"}],"wp:attachment":[{"href":"https:\/\/www.audioexcite.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=4874"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}