{"id":6634,"date":"2017-11-19T13:16:59","date_gmt":"2017-11-19T13:16:59","guid":{"rendered":"http:\/\/www.audioexcite.com\/?page_id=6634"},"modified":"2018-01-20T09:52:09","modified_gmt":"2018-01-20T09:52:09","slug":"sb-acoustics-sb23nrxs45-8","status":"publish","type":"page","link":"https:\/\/www.audioexcite.com\/?page_id=6634","title":{"rendered":"SB Acoustics SB23NRXS45-8"},"content":{"rendered":"<h3><span style=\"color: #3366ff;\">Overview:<\/span><\/h3>\n<p><a href=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/SB23NRXCS45-8.jpg\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"alignright wp-image-6638\" src=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/SB23NRXCS45-8.jpg\" alt=\"\" width=\"230\" height=\"333\" srcset=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/SB23NRXCS45-8.jpg 419w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/SB23NRXCS45-8-207x300.jpg 207w\" sizes=\"auto, (max-width: 230px) 100vw, 230px\" \/><\/a><br \/>\nThe SB Acoustics SB23NRXS45-8 is an 8\u2126 8\u2033 woofer from SB Acoustics. The woofer has a 45.5mm voice-coil with a 13mm (p-p) linear coil travel. It&#8217;s fitted with a shorting ring in motor system for reduced distortion.<\/p>\n<p><strong>Key features:<\/strong><\/p>\n<ul>\n<li>Soft low damping rubber surround for improved transient response<\/li>\n<li>Shorting ring in motor system for reduced distortion<\/li>\n<li>Vented pole piece for reduced compression<\/li>\n<li>Vented cast aluminum chassis for optimum strength and low compression<\/li>\n<li>Shallow design<\/li>\n<li>Non-conducting fiber glass voice coil former for minimum damping<\/li>\n<li>CCAW voice coil for reduced moving mass<\/li>\n<li>Long life silver lead wires<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p>SB Acoustics Spec sheet: <a href=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/8in-SB23NRXS45-8-Rev-1.pdf\">8in SB23NRXS45-8 Rev-1<\/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\/2017\/11\/T-S-Parameters-SB23NRXS45-8.jpg\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-6647\" src=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/T-S-Parameters-SB23NRXS45-8.jpg\" alt=\"\" width=\"600\" height=\"459\" srcset=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/T-S-Parameters-SB23NRXS45-8.jpg 691w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/T-S-Parameters-SB23NRXS45-8-300x230.jpg 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/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\/2017\/11\/Imp-SB23NRXS45-8-1L-vs-2R.jpg\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-6644 size-large\" src=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/Imp-SB23NRXS45-8-1L-vs-2R-1024x531.jpg\" alt=\"\" width=\"720\" height=\"373\" srcset=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/Imp-SB23NRXS45-8-1L-vs-2R-1024x531.jpg 1024w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/Imp-SB23NRXS45-8-1L-vs-2R-300x156.jpg 300w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/Imp-SB23NRXS45-8-1L-vs-2R-768x399.jpg 768w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/Imp-SB23NRXS45-8-1L-vs-2R.jpg 1613w\" sizes=\"auto, (max-width: 720px) 100vw, 720px\" \/><\/a><\/p>\n<p>(click on picture to zoom)<\/p>\n<p><strong>Blue:<\/strong> Mid-woofer sample #1<\/p>\n<p><strong>Green:<\/strong> Mid-woofer sample #2<strong><br \/>\n<\/strong><\/p>\n<p>A small resonance issue around 1kHz<\/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 27 liter closed enclosure with the following conditions:<\/p>\n<p><strong>Baffle size (WxH):<\/strong> 26\u00d740cm with 18mm round-over on the baffle edges (r=18).<br \/>\n<strong>Driver position:<\/strong> Mounted on center-line with driver unit center 24cm from the top of the baffle.<br \/>\n<strong>Mic position:<\/strong> 1m distance, on woofer-axis. Nearfield at 1cm and 10cm from dust-cap.<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\/2017\/11\/Freq-SB23NRXS45-8-NF-1cm-1L-vs-2R.jpg\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-6654\" src=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/Freq-SB23NRXS45-8-NF-1cm-1L-vs-2R.jpg\" alt=\"\" width=\"360\" height=\"114\" srcset=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/Freq-SB23NRXS45-8-NF-1cm-1L-vs-2R.jpg 1287w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/Freq-SB23NRXS45-8-NF-1cm-1L-vs-2R-300x95.jpg 300w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/Freq-SB23NRXS45-8-NF-1cm-1L-vs-2R-768x244.jpg 768w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/Freq-SB23NRXS45-8-NF-1cm-1L-vs-2R-1024x325.jpg 1024w\" sizes=\"auto, (max-width: 360px) 100vw, 360px\" \/><\/a><a href=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/Freq-SB23NRXS45-8-NF-10cm-1L-vs-2R.jpg\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-6655\" src=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/Freq-SB23NRXS45-8-NF-10cm-1L-vs-2R.jpg\" alt=\"\" width=\"360\" height=\"114\" srcset=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/Freq-SB23NRXS45-8-NF-10cm-1L-vs-2R.jpg 1287w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/Freq-SB23NRXS45-8-NF-10cm-1L-vs-2R-300x95.jpg 300w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/Freq-SB23NRXS45-8-NF-10cm-1L-vs-2R-768x244.jpg 768w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/Freq-SB23NRXS45-8-NF-10cm-1L-vs-2R-1024x325.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 near-field 1cm from dust-cap (Blue=sample#1 Red=sample#2).<br \/>\n<strong>Right:<\/strong> Frequency response on-axis\u00a0near-field 10cm from dust-cap (Blue=sample#1, Red=sample#2).<\/p>\n<p>&nbsp;<\/p>\n<p><a href=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/Freq-SB23NRXS45-8-0deg-1L-vs-2R.jpg\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-6651\" src=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/Freq-SB23NRXS45-8-0deg-1L-vs-2R.jpg\" alt=\"\" width=\"360\" height=\"114\" srcset=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/Freq-SB23NRXS45-8-0deg-1L-vs-2R.jpg 1287w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/Freq-SB23NRXS45-8-0deg-1L-vs-2R-300x95.jpg 300w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/Freq-SB23NRXS45-8-0deg-1L-vs-2R-768x244.jpg 768w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/Freq-SB23NRXS45-8-0deg-1L-vs-2R-1024x325.jpg 1024w\" sizes=\"auto, (max-width: 360px) 100vw, 360px\" \/><\/a><a href=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/Freq-SB23NRXS45-8-15deg-1L-vs-2R.jpg\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-6652\" src=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/Freq-SB23NRXS45-8-15deg-1L-vs-2R.jpg\" alt=\"\" width=\"360\" height=\"114\" srcset=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/Freq-SB23NRXS45-8-15deg-1L-vs-2R.jpg 1287w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/Freq-SB23NRXS45-8-15deg-1L-vs-2R-300x95.jpg 300w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/Freq-SB23NRXS45-8-15deg-1L-vs-2R-768x244.jpg 768w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/Freq-SB23NRXS45-8-15deg-1L-vs-2R-1024x325.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>&nbsp;<\/p>\n<p><a href=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/Freq-SB23NRXS45-8-0-15-22deg.jpg\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-6649 size-large\" src=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/Freq-SB23NRXS45-8-0-15-22deg-1024x325.jpg\" alt=\"\" width=\"720\" height=\"229\" srcset=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/Freq-SB23NRXS45-8-0-15-22deg-1024x325.jpg 1024w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/Freq-SB23NRXS45-8-0-15-22deg-300x95.jpg 300w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/Freq-SB23NRXS45-8-0-15-22deg-768x244.jpg 768w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/Freq-SB23NRXS45-8-0-15-22deg.jpg 1287w\" sizes=\"auto, (max-width: 720px) 100vw, 720px\" \/><\/a><\/p>\n<p>0deg = Blue<br \/>\n15deg = Red<br \/>\n22.5deg = Green<\/p>\n<p>&nbsp;<\/p>\n<p><a href=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/Freq-SB23NRXS45-8-30-45-60deg.jpg\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-6650 size-large\" src=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/Freq-SB23NRXS45-8-30-45-60deg-1024x325.jpg\" alt=\"\" width=\"720\" height=\"229\" srcset=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/Freq-SB23NRXS45-8-30-45-60deg-1024x325.jpg 1024w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/Freq-SB23NRXS45-8-30-45-60deg-300x95.jpg 300w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/Freq-SB23NRXS45-8-30-45-60deg-768x244.jpg 768w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/Freq-SB23NRXS45-8-30-45-60deg.jpg 1287w\" sizes=\"auto, (max-width: 720px) 100vw, 720px\" \/><\/a><\/p>\n<p>30deg = Blue<br \/>\n45deg = Red<br \/>\n60deg = Green<\/p>\n<p>The SB23NRXS45-8woofer has a very smooth frequency response up to about 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>Woofer near-field measurement at 20cm<\/li>\n<li>Frequency range woofer: 100-10000Hz<\/li>\n<li>Baffle size WxH: 26\u00d740cm<\/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>&nbsp;<\/p>\n<p><a href=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/SB23NRXCS45-8-1-20cm-90db.jpg\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-6640\" src=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/SB23NRXCS45-8-1-20cm-90db.jpg\" alt=\"\" width=\"360\" height=\"196\" srcset=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/SB23NRXCS45-8-1-20cm-90db.jpg 1404w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/SB23NRXCS45-8-1-20cm-90db-300x164.jpg 300w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/SB23NRXCS45-8-1-20cm-90db-768x419.jpg 768w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/SB23NRXCS45-8-1-20cm-90db-1024x559.jpg 1024w\" sizes=\"auto, (max-width: 360px) 100vw, 360px\" \/><\/a><a href=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/SB23NRXCS45-8-2-20cm-90db.jpg\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-6641\" src=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/SB23NRXCS45-8-2-20cm-90db.jpg\" alt=\"\" width=\"360\" height=\"196\" srcset=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/SB23NRXCS45-8-2-20cm-90db.jpg 1404w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/SB23NRXCS45-8-2-20cm-90db-300x164.jpg 300w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/SB23NRXCS45-8-2-20cm-90db-768x419.jpg 768w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/SB23NRXCS45-8-2-20cm-90db-1024x559.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\/2017\/11\/SB23NRXCS45-8-1-20cm-95db.jpg\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-6642\" src=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/SB23NRXCS45-8-1-20cm-95db.jpg\" alt=\"\" width=\"360\" height=\"196\" srcset=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/SB23NRXCS45-8-1-20cm-95db.jpg 1404w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/SB23NRXCS45-8-1-20cm-95db-300x164.jpg 300w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/SB23NRXCS45-8-1-20cm-95db-768x419.jpg 768w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/SB23NRXCS45-8-1-20cm-95db-1024x559.jpg 1024w\" sizes=\"auto, (max-width: 360px) 100vw, 360px\" \/><\/a><a href=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/SB23NRXCS45-8-2-20cm-95db.jpg\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-6643\" src=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/SB23NRXCS45-8-2-20cm-95db.jpg\" alt=\"\" width=\"360\" height=\"196\" srcset=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/SB23NRXCS45-8-2-20cm-95db.jpg 1404w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/SB23NRXCS45-8-2-20cm-95db-300x164.jpg 300w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/SB23NRXCS45-8-2-20cm-95db-768x419.jpg 768w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2017\/11\/SB23NRXCS45-8-2-20cm-95db-1024x559.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>The SB23NRXS45-8\u00a0 woofer is overall a low distortion driver. The resonance issue shown in the impedance plot around 1kHz is shown here as a slightly elevated odd order distortion.\u00a0 The woofer&#8217;s odd-order distortion is low below 0.6kHz and it has a slightly increasing odd-order distortion above 0.6kHz.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview: The SB Acoustics SB23NRXS45-8 is an 8\u2126 8\u2033 woofer from SB Acoustics. The woofer has a 45.5mm voice-coil with a 13mm (p-p) linear coil travel. It&#8217;s fitted with a shorting ring in motor system for reduced distortion. Key features: Soft low damping rubber surround for improved transient response Shorting ring in motor system for [&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-6634","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.audioexcite.com\/index.php?rest_route=\/wp\/v2\/pages\/6634","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=6634"}],"version-history":[{"count":15,"href":"https:\/\/www.audioexcite.com\/index.php?rest_route=\/wp\/v2\/pages\/6634\/revisions"}],"predecessor-version":[{"id":6693,"href":"https:\/\/www.audioexcite.com\/index.php?rest_route=\/wp\/v2\/pages\/6634\/revisions\/6693"}],"wp:attachment":[{"href":"https:\/\/www.audioexcite.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=6634"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}