{"id":4948,"date":"2015-01-11T19:46:51","date_gmt":"2015-01-11T19:46:51","guid":{"rendered":"http:\/\/www.audioexcite.com\/?page_id=4948"},"modified":"2015-01-25T16:25:06","modified_gmt":"2015-01-25T16:25:06","slug":"scanspeak-18w4531-g01","status":"publish","type":"page","link":"https:\/\/www.audioexcite.com\/?page_id=4948","title":{"rendered":"ScanSpeak 18W4531-G01"},"content":{"rendered":"<h3><span style=\"color: #3366ff;\">Overview:<\/span><\/h3>\n<p><a href=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2016\/01\/18W4531-G01_Pic2.jpg\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" class=\" wp-image-4967 alignright\" src=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2016\/01\/18W4531-G01_Pic2.jpg\" alt=\"18W4531-G01_Pic2\" width=\"200\" height=\"315\" srcset=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2016\/01\/18W4531-G01_Pic2.jpg 686w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2016\/01\/18W4531-G01_Pic2-190x300.jpg 190w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2016\/01\/18W4531-G01_Pic2-649x1024.jpg 649w\" sizes=\"auto, (max-width: 200px) 100vw, 200px\" \/><\/a><\/p>\n<p>The 18W\/4531-G01 is a 4\u03a9 mid-woofer from the ScanSpeak\u00a0Revelator series.<\/p>\n<p>It uses a sliced wood fibre cone technology. The slices are filled with damping glue, which dramatically reduces breakup modes in the diaphragm. In combination with Scan-Speaks low-loss linear suspension and the patented Symmetrical Drive (SD-1) it represented a break through in midrange clarity and overall smooth frequency response characteristics.<\/p>\n<p>The 38mm voice-coil has a glass fiber voice-coil former.<\/p>\n<p><strong>Key features:<\/strong><\/p>\n<ul>\n<li>\u0097Patented Symmetrical Drive Motor Design<\/li>\n<li>Wood fibre cone<\/li>\n<li>\u0097Low-Loss linear suspension<\/li>\n<li>Die cast Alu Chassis vented below spider<\/li>\n<li>Sliced Cone (Controls Cone Breakups)<\/li>\n<li>Low Damping SBR Rubber Surround<\/li>\n<li>Large Ferrite Magnet System<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p>ScanSpeak Spec sheet: <a href=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2011\/10\/18w-4531g01.pdf\">18W\/4531G-01<\/a><\/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\/2016\/01\/18W4531G01-TS-parameters.jpg\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-4968\" src=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2016\/01\/18W4531G01-TS-parameters.jpg\" alt=\"18W4531G01 - TS parameters\" width=\"600\" height=\"472\" srcset=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2016\/01\/18W4531G01-TS-parameters.jpg 673w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2016\/01\/18W4531G01-TS-parameters-300x236.jpg 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/a><\/p>\n<p>Higher sensitivity, resonance frequency and Qts compared to the official specification. This is unfortunately common with many Scanspeak mid-woofers.<\/p>\n<p><strong>Note!<\/strong> The cone area differs from the official specification.<\/p>\n<h3><span style=\"color: #3366ff;\">Impedance:<\/span><\/h3>\n<p>&nbsp;<\/p>\n<p><a href=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2016\/01\/18W4531G01-Imp.jpg\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-4970\" src=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2016\/01\/18W4531G01-Imp.jpg\" alt=\"18W4531G01 - Imp\" width=\"720\" height=\"405\" srcset=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2016\/01\/18W4531G01-Imp.jpg 1366w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2016\/01\/18W4531G01-Imp-300x169.jpg 300w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2016\/01\/18W4531G01-Imp-1024x576.jpg 1024w\" sizes=\"auto, (max-width: 720px) 100vw, 720px\" \/><\/a><\/p>\n<p>Minor differences between the two tested driver unit samples. A small wrinkle in the impedance plot can be seen around 800Hz.<\/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 23,7cm 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>&nbsp;<\/p>\n<p><a href=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2016\/01\/18W4531-G01-Freq-0deg-1L-vs-2R-tw-axis.jpg\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-4971\" src=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2016\/01\/18W4531-G01-Freq-0deg-1L-vs-2R-tw-axis.jpg\" alt=\"18W4531-G01 Freq 0deg 1L vs 2R tw-axis\" width=\"360\" height=\"122\" srcset=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2016\/01\/18W4531-G01-Freq-0deg-1L-vs-2R-tw-axis.jpg 1117w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2016\/01\/18W4531-G01-Freq-0deg-1L-vs-2R-tw-axis-300x101.jpg 300w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2016\/01\/18W4531-G01-Freq-0deg-1L-vs-2R-tw-axis-1024x346.jpg 1024w\" sizes=\"auto, (max-width: 360px) 100vw, 360px\" \/><\/a><a href=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2016\/01\/18W4531-G01-Freq-15deg-1L-vs-2R.jpg\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-4972\" src=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2016\/01\/18W4531-G01-Freq-15deg-1L-vs-2R.jpg\" alt=\"18W4531-G01 Freq 15deg 1L vs 2R\" width=\"360\" height=\"122\" srcset=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2016\/01\/18W4531-G01-Freq-15deg-1L-vs-2R.jpg 1117w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2016\/01\/18W4531-G01-Freq-15deg-1L-vs-2R-300x101.jpg 300w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2016\/01\/18W4531-G01-Freq-15deg-1L-vs-2R-1024x346.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.<\/p>\n<p><a href=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2016\/01\/18W4531-G01-Freq-0-15-22.5deg-1L.jpg\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-4973\" src=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2016\/01\/18W4531-G01-Freq-0-15-22.5deg-1L.jpg\" alt=\"18W4531-G01 Freq 0-15-22.5deg 1L\" width=\"720\" height=\"243\" srcset=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2016\/01\/18W4531-G01-Freq-0-15-22.5deg-1L.jpg 1117w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2016\/01\/18W4531-G01-Freq-0-15-22.5deg-1L-300x101.jpg 300w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2016\/01\/18W4531-G01-Freq-0-15-22.5deg-1L-1024x346.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\/2016\/01\/18W4531-G01-Freq-30-45-60deg-1L.jpg\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-4974\" src=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2016\/01\/18W4531-G01-Freq-30-45-60deg-1L.jpg\" alt=\"18W4531-G01 Freq 30-45-60deg 1L\" width=\"720\" height=\"243\" srcset=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2016\/01\/18W4531-G01-Freq-30-45-60deg-1L.jpg 1117w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2016\/01\/18W4531-G01-Freq-30-45-60deg-1L-300x101.jpg 300w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2016\/01\/18W4531-G01-Freq-30-45-60deg-1L-1024x346.jpg 1024w\" sizes=\"auto, (max-width: 720px) 100vw, 720px\" \/><\/a><\/p>\n<p>30deg = Blue<br \/>\n45deg = Red<br \/>\n60deg = Green<\/p>\n<p>Very smooth frequency response. The mid-woofer starts to roll-off at 2kHz 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>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\/2016\/01\/18W4531G-01_58032-5-1L-15cm-90db.jpg\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-4976\" src=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2016\/01\/18W4531G-01_58032-5-1L-15cm-90db.jpg\" alt=\"18W4531G-01_58032-5-1L--15cm 90db\" width=\"360\" height=\"207\" srcset=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2016\/01\/18W4531G-01_58032-5-1L-15cm-90db.jpg 1234w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2016\/01\/18W4531G-01_58032-5-1L-15cm-90db-300x173.jpg 300w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2016\/01\/18W4531G-01_58032-5-1L-15cm-90db-1024x590.jpg 1024w\" sizes=\"auto, (max-width: 360px) 100vw, 360px\" \/><\/a><a href=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2016\/01\/18W4531G-01_58032-15-2R-15cm-90db.jpg\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-4977\" src=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2016\/01\/18W4531G-01_58032-15-2R-15cm-90db.jpg\" alt=\"18W4531G-01_58032-15-2R--15cm 90db\" width=\"360\" height=\"207\" srcset=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2016\/01\/18W4531G-01_58032-15-2R-15cm-90db.jpg 1234w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2016\/01\/18W4531G-01_58032-15-2R-15cm-90db-300x173.jpg 300w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2016\/01\/18W4531G-01_58032-15-2R-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\/2016\/01\/18W4531G-01_58032-5-1L-15cm-95db.jpg\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-4978\" src=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2016\/01\/18W4531G-01_58032-5-1L-15cm-95db.jpg\" alt=\"18W4531G-01_58032-5-1L--15cm 95db\" width=\"360\" height=\"207\" srcset=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2016\/01\/18W4531G-01_58032-5-1L-15cm-95db.jpg 1234w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2016\/01\/18W4531G-01_58032-5-1L-15cm-95db-300x173.jpg 300w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2016\/01\/18W4531G-01_58032-5-1L-15cm-95db-1024x590.jpg 1024w\" sizes=\"auto, (max-width: 360px) 100vw, 360px\" \/><\/a><a href=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2016\/01\/18W4531G-01_58032-15-2R-15cm-95db.jpg\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-4979\" src=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2016\/01\/18W4531G-01_58032-15-2R-15cm-95db.jpg\" alt=\"18W4531G-01_58032-15-2R--15cm 95db\" width=\"360\" height=\"207\" srcset=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2016\/01\/18W4531G-01_58032-15-2R-15cm-95db.jpg 1234w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2016\/01\/18W4531G-01_58032-15-2R-15cm-95db-300x173.jpg 300w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2016\/01\/18W4531G-01_58032-15-2R-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>Elevated second-order harmonics between 0.4-1kHz, but the odd-order distortion profile is very low throughout the frequency range.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview: The 18W\/4531-G01 is a 4\u03a9 mid-woofer from the ScanSpeak\u00a0Revelator series. It uses a sliced wood fibre cone technology. The slices are filled with damping glue, which dramatically reduces breakup modes in the diaphragm. In combination with Scan-Speaks low-loss linear suspension and the patented Symmetrical Drive (SD-1) it represented a break through in midrange clarity [&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-4948","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.audioexcite.com\/index.php?rest_route=\/wp\/v2\/pages\/4948","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=4948"}],"version-history":[{"count":5,"href":"https:\/\/www.audioexcite.com\/index.php?rest_route=\/wp\/v2\/pages\/4948\/revisions"}],"predecessor-version":[{"id":4966,"href":"https:\/\/www.audioexcite.com\/index.php?rest_route=\/wp\/v2\/pages\/4948\/revisions\/4966"}],"wp:attachment":[{"href":"https:\/\/www.audioexcite.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=4948"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}