{"id":4121,"date":"2013-12-17T19:19:53","date_gmt":"2013-12-17T19:19:53","guid":{"rendered":"http:\/\/www.audioexcite.com\/?page_id=4121"},"modified":"2013-12-20T17:27:04","modified_gmt":"2013-12-20T17:27:04","slug":"sb-acoustics-sb15nrxc30-4","status":"publish","type":"page","link":"https:\/\/www.audioexcite.com\/?page_id=4121","title":{"rendered":"SB Acoustics SB15NRXC30-4"},"content":{"rendered":"<h3><a href=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2013\/12\/SB15NRXC30-4_1.jpg\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-4144 alignright\" alt=\"SB15NRXC30-4_1\" src=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2013\/12\/SB15NRXC30-4_1.jpg\" width=\"231\" height=\"306\" \/><\/a><span style=\"color: #3366ff;\">Overview:<\/span><\/h3>\n<p>&nbsp;<\/p>\n<p>The\u00a0 SB15NRXC30-4 is a 4\u2126\u00a0 5&#8243; mid-woofer from SB Acoustics.<\/p>\n<p>The mid-woofer has a 30.5mm voice-coil with a healthy 10mm (p-p) linear coil travel. It has a very low voice-coil inductance and is fitted with a copper sleeve on the pole piece to ensure a low distortion performance.<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Key features:<\/strong><\/p>\n<ul>\n<li>Vented cast aluminum chassis for optimum strength and low compression<\/li>\n<li>Proprietary cone material with natural fibers made in-house<\/li>\n<li>Soft low damping rubber surround for improved transient response<\/li>\n<li>Non-conducting fiber glass voice coil former for minimum damping<\/li>\n<li>Extended copper sleeve on pole piece for low inductance and low distortion<\/li>\n<li>CCAW voice coil for reduced moving mass<\/li>\n<li>Long life silver lead wires<\/li>\n<li>Vented pole piece for reduced compression<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p>Considering its features, build quality and measured performance this mid-woofer has a very high price\/performance ratio.<\/p>\n<p>SB Acoustics Spec sheet: <a href=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2013\/12\/5in-SB15NRXC30-4.pdf\">5in SB15NRXC30-4<\/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\/2013\/12\/SB15NRXC30-4_T-S_WT2.jpg\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-4149\" alt=\"SB15NRXC30-4_T-S_WT2\" src=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2013\/12\/SB15NRXC30-4_T-S_WT2.jpg\" width=\"595\" height=\"455\" srcset=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2013\/12\/SB15NRXC30-4_T-S_WT2.jpg 749w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2013\/12\/SB15NRXC30-4_T-S_WT2-300x229.jpg 300w\" sizes=\"auto, (max-width: 595px) 100vw, 595px\" \/><\/a><\/p>\n<p>Good consistency between the driver unit samples. Just about the same Fs and about 1dB lower sensitivity than official specs.<\/p>\n<p>The mid-woofer has a high mechanical Q-factor (Qms) and low mechanical loss (Rms).<\/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\/2013\/12\/SB15NRXC30-4_Imp-1L-vs-2R-WT3.jpg\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone  wp-image-4150\" alt=\"SB15NRXC30-4_Imp 1L vs 2R WT3\" src=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2013\/12\/SB15NRXC30-4_Imp-1L-vs-2R-WT3.jpg\" width=\"719\" height=\"404\" srcset=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2013\/12\/SB15NRXC30-4_Imp-1L-vs-2R-WT3.jpg 1366w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2013\/12\/SB15NRXC30-4_Imp-1L-vs-2R-WT3-300x168.jpg 300w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2013\/12\/SB15NRXC30-4_Imp-1L-vs-2R-WT3-1024x575.jpg 1024w\" sizes=\"auto, (max-width: 719px) 100vw, 719px\" \/><\/a><\/p>\n<p>Note the very low inductance. A minor wrinkle in the impedance plot at 1.2kHz.<\/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 14 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 21,5cm 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\/2013\/12\/SB15NRXC30-4_Freq-1L-vs-2R-0deg.jpg\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone  wp-image-4151\" alt=\"SB15NRXC30-4_Freq 1L vs 2R 0deg\" src=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2013\/12\/SB15NRXC30-4_Freq-1L-vs-2R-0deg.jpg\" width=\"359\" height=\"121\" srcset=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2013\/12\/SB15NRXC30-4_Freq-1L-vs-2R-0deg.jpg 1117w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2013\/12\/SB15NRXC30-4_Freq-1L-vs-2R-0deg-300x101.jpg 300w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2013\/12\/SB15NRXC30-4_Freq-1L-vs-2R-0deg-1024x345.jpg 1024w\" sizes=\"auto, (max-width: 359px) 100vw, 359px\" \/><\/a><a href=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2013\/12\/SB15NRXC30-4_Freq-1L-vs-2R-15deg.jpg\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone  wp-image-4152\" alt=\"SB15NRXC30-4_Freq 1L vs 2R 15deg\" src=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2013\/12\/SB15NRXC30-4_Freq-1L-vs-2R-15deg.jpg\" width=\"359\" height=\"121\" srcset=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2013\/12\/SB15NRXC30-4_Freq-1L-vs-2R-15deg.jpg 1117w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2013\/12\/SB15NRXC30-4_Freq-1L-vs-2R-15deg-300x101.jpg 300w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2013\/12\/SB15NRXC30-4_Freq-1L-vs-2R-15deg-1024x345.jpg 1024w\" sizes=\"auto, (max-width: 359px) 100vw, 359px\" \/><\/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. Smooth frequency response up to 4kHz.<\/p>\n<p><a href=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2013\/12\/SB15NRXC30-4_Freq-0-15-22deg.jpg\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone  wp-image-4153\" alt=\"SB15NRXC30-4_Freq 0-15-22deg\" src=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2013\/12\/SB15NRXC30-4_Freq-0-15-22deg.jpg\" width=\"720\" height=\"242\" srcset=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2013\/12\/SB15NRXC30-4_Freq-0-15-22deg.jpg 1117w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2013\/12\/SB15NRXC30-4_Freq-0-15-22deg-300x101.jpg 300w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2013\/12\/SB15NRXC30-4_Freq-0-15-22deg-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\/2013\/12\/SB15NRXC30-4_Freq-30-45-60deg.jpg\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone  wp-image-4154\" alt=\"SB15NRXC30-4_Freq 30-45-60deg\" src=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2013\/12\/SB15NRXC30-4_Freq-30-45-60deg.jpg\" width=\"720\" height=\"242\" srcset=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2013\/12\/SB15NRXC30-4_Freq-30-45-60deg.jpg 1117w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2013\/12\/SB15NRXC30-4_Freq-30-45-60deg-300x101.jpg 300w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2013\/12\/SB15NRXC30-4_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>Due to the mid-woofers very low inductance and flat impedance response, the on-axis frequency response has an extremely linear and extended response up to about 12.5kHz.<\/p>\n<p>The broad hump between 0.5-1.5kHz is partly due to the shape of the baffle and the baffle step.\u00a0\u00a0We have a minor notch centered at 1.5kHz due to the low loss surround causing a cone edge resonance. It has a very smooth frequency response between 1.8kHz and 4kHz<\/p>\n<p>3-3.5kHz is about the highest suitable cross-over frequency for this mid-woofer.<\/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\/2013\/12\/SB15NRXC30-4-1L-15cm-90db.jpg\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone  wp-image-4155\" alt=\"SB15NRXC30-4-1L -- 15cm 90db\" src=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2013\/12\/SB15NRXC30-4-1L-15cm-90db.jpg\" width=\"360\" height=\"207\" srcset=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2013\/12\/SB15NRXC30-4-1L-15cm-90db.jpg 1234w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2013\/12\/SB15NRXC30-4-1L-15cm-90db-300x172.jpg 300w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2013\/12\/SB15NRXC30-4-1L-15cm-90db-1024x590.jpg 1024w\" sizes=\"auto, (max-width: 360px) 100vw, 360px\" \/><\/a><a href=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2013\/12\/SB15NRXC30-4-2R-15cm-90db.jpg\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone  wp-image-4156\" alt=\"SB15NRXC30-4-2R -- 15cm 90db\" src=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2013\/12\/SB15NRXC30-4-2R-15cm-90db.jpg\" width=\"360\" height=\"207\" srcset=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2013\/12\/SB15NRXC30-4-2R-15cm-90db.jpg 1234w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2013\/12\/SB15NRXC30-4-2R-15cm-90db-300x172.jpg 300w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2013\/12\/SB15NRXC30-4-2R-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\/2013\/12\/SB15NRXC30-4-1L-15cm-95db.jpg\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone  wp-image-4157\" alt=\"SB15NRXC30-4-1L -- 15cm 95db\" src=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2013\/12\/SB15NRXC30-4-1L-15cm-95db.jpg\" width=\"360\" height=\"207\" srcset=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2013\/12\/SB15NRXC30-4-1L-15cm-95db.jpg 1234w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2013\/12\/SB15NRXC30-4-1L-15cm-95db-300x172.jpg 300w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2013\/12\/SB15NRXC30-4-1L-15cm-95db-1024x590.jpg 1024w\" sizes=\"auto, (max-width: 360px) 100vw, 360px\" \/><\/a><a href=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2013\/12\/SB15NRXC30-4-2R-15cm-95db.jpg\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone  wp-image-4158\" alt=\"SB15NRXC30-4-2R -- 15cm 95db\" src=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2013\/12\/SB15NRXC30-4-2R-15cm-95db.jpg\" width=\"360\" height=\"207\" srcset=\"https:\/\/www.audioexcite.com\/wp-content\/uploads\/2013\/12\/SB15NRXC30-4-2R-15cm-95db.jpg 1234w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2013\/12\/SB15NRXC30-4-2R-15cm-95db-300x172.jpg 300w, https:\/\/www.audioexcite.com\/wp-content\/uploads\/2013\/12\/SB15NRXC30-4-2R-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 the expected relatively harmless elevated second-order harmonics due to the cone edge resonance.<\/p>\n<p>Good performance for a low priced mid-woofer<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview: &nbsp; The\u00a0 SB15NRXC30-4 is a 4\u2126\u00a0 5&#8243; mid-woofer from SB Acoustics. The mid-woofer has a 30.5mm voice-coil with a healthy 10mm (p-p) linear coil travel. It has a very low voice-coil inductance and is fitted with a copper sleeve on the pole piece to ensure a low distortion performance. &nbsp; Key features: Vented cast [&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-4121","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.audioexcite.com\/index.php?rest_route=\/wp\/v2\/pages\/4121","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=4121"}],"version-history":[{"count":4,"href":"https:\/\/www.audioexcite.com\/index.php?rest_route=\/wp\/v2\/pages\/4121\/revisions"}],"predecessor-version":[{"id":4145,"href":"https:\/\/www.audioexcite.com\/index.php?rest_route=\/wp\/v2\/pages\/4121\/revisions\/4145"}],"wp:attachment":[{"href":"https:\/\/www.audioexcite.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=4121"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}