{"id":1243,"date":"2011-12-04T15:55:10","date_gmt":"2011-12-04T15:55:10","guid":{"rendered":"http:\/\/www.audioexcite.com\/?p=1243"},"modified":"2011-12-04T16:41:35","modified_gmt":"2011-12-04T16:41:35","slug":"excellence-two-%e2%80%93-mini-monitor-construction-update5","status":"publish","type":"post","link":"https:\/\/www.audioexcite.com\/?p=1243","title":{"rendered":"Excellence Two \u2013 Mini Monitor Construction Update5!"},"content":{"rendered":"

 <\/p>\n

I\u2019ve begun with the cross-over simulations based on the frequency measurements I did last weekend. So far everything is going well and it was quite easy to simulate the first prototype cross-over design, which I will build, measure and listen to.<\/p>\n

There are a couple of challenges to deal with in this design. First of all the mid-woofer cone break-up needs to be taken care of properly. I will use steep cross-over slopes (24dB\/octave acoustical) and a notch filter to reduce the 10kHz break-up mode.<\/p>\n

I\u2019m not fully satisfied with the conventional LCR notch approach, instead I will try an alternative method to deal with the break-up and to reduce the complexity of the filter. Distortion measurements and listening tests will decide which method I will use.<\/p>\n

Second, I have to deal with the tweeters rising top-end response and how much attenuation it needs in order to get a well-balanced sound that doesn\u2019t sound to bright, but still manage to present an open and airy sound.<\/p>\n

 <\/p>\n

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

Left:<\/strong> On-axis Right:<\/strong> 15deg off-axis<\/p>\n

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

Left:<\/strong> 22.5deg off-axis Right:<\/strong> Individual driver phase integration<\/p>\n

 <\/p>\n

The 1m measurement indicates that the mid-woofer relative acoustic off-set is approximately 25mm (1\u201d) compared to the tweeter.<\/p>\n

The cross-over simulation is optimized for the 15deg off-axis measurement and at a 2.5m listening distance.<\/p>\n

As can been seen I\u2019ve used almost a full baffle-step compensation and the sensitivity is about 81dB 2.83v\/1m. Not exactly a high sensitivity design, but as expected when using such a small mid-woofer for woofer duties and not only for mid-range duties.<\/p>\n

The mid-woofers cone break-up at 10kHz is well suppressed and the 13.5kHz and higher break-ups is suppressed by 45-50dB and should be off the audible radar.<\/p>\n

The cross-over frequency occurs at 2100Hz and the phase integration between the mid-woofer and the tweeter is superb.<\/p>\n

The tweeter has a rising top-end at the 0deg, on-axis frequency response and it\u2019s still visible from 15kHz at the 15deg off-axis frequency response. Listening tests will decide if the tweeter needs more attenuation.<\/p>\n

Personally I like when the on-axis response has a somewhat rising top-end, since it often contributes to a greater 3-D perspective and soundstage. However, to avoid an overly bright sound characteristic this calls for a non toe-in loudspeaker setup.<\/p>\n","protected":false},"excerpt":{"rendered":"

  I\u2019ve begun with the cross-over simulations based on the frequency measurements I did last weekend. So far everything is going well and it was quite easy to simulate the first prototype cross-over design, which I will build, measure and listen to. There are a couple of challenges to deal with in this design. First […]<\/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-1243","post","type-post","status-publish","format-standard","hentry","category-blog"],"_links":{"self":[{"href":"https:\/\/www.audioexcite.com\/index.php?rest_route=\/wp\/v2\/posts\/1243","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=1243"}],"version-history":[{"count":17,"href":"https:\/\/www.audioexcite.com\/index.php?rest_route=\/wp\/v2\/posts\/1243\/revisions"}],"predecessor-version":[{"id":1247,"href":"https:\/\/www.audioexcite.com\/index.php?rest_route=\/wp\/v2\/posts\/1243\/revisions\/1247"}],"wp:attachment":[{"href":"https:\/\/www.audioexcite.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1243"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.audioexcite.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1243"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.audioexcite.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1243"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}