{"id":998,"date":"2025-07-27T15:47:44","date_gmt":"2025-07-27T13:47:44","guid":{"rendered":"https:\/\/invar.nl\/?page_id=998"},"modified":"2025-07-27T15:47:44","modified_gmt":"2025-07-27T13:47:44","slug":"old-speaker-projects","status":"publish","type":"page","link":"https:\/\/invar.nl\/?page_id=998","title":{"rendered":"Old speaker projects"},"content":{"rendered":"\n<p>Speaker projects from before this blog.<\/p>\n\n\n<ul class=\"wp-block-latest-posts__list has-dates wp-block-latest-posts\"><li><a class=\"wp-block-latest-posts__post-title\" href=\"https:\/\/invar.nl\/?p=1011\">THAM10 but with Mivoc AWM104<\/a><time datetime=\"2025-07-27T16:59:57+02:00\" class=\"wp-block-latest-posts__post-date\">27 July 2025<\/time><div class=\"wp-block-latest-posts__post-full-content\"><!-- wp:paragraph -->\n<p>Early 2015. 10&#8243; tapped horn &#8220;subs&#8221; to go with my 2&#215;6&#8243; &#8220;top&#8221; cabinet, for bass guitar. Also used as bass speakers for house parties at the time. Currently gathering dust, not sure what I will do with these.<\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:image {\"id\":1012,\"width\":\"428px\",\"height\":\"auto\",\"sizeSlug\":\"full\",\"linkDestination\":\"none\"} -->\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"853\" src=\"https:\/\/invar.nl\/projects\/wp-content\/uploads\/2025\/07\/P1350282.jpg\" alt=\"\" class=\"wp-image-1012\" style=\"width:428px;height:auto\" srcset=\"https:\/\/invar.nl\/projects\/wp-content\/uploads\/2025\/07\/P1350282.jpg 640w, https:\/\/invar.nl\/projects\/wp-content\/uploads\/2025\/07\/P1350282-225x300.jpg 225w, https:\/\/invar.nl\/projects\/wp-content\/uploads\/2025\/07\/P1350282-158x210.jpg 158w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><\/figure>\n<!-- \/wp:image -->\n\n<!-- wp:paragraph -->\n<p>These are copies of <a href=\"http:\/\/www.martinsson.cc\/blog\/index.php?m=03&amp;y=11&amp;entry=entry110306-224208\" target=\"_blank\" rel=\"noreferrer noopener\">THAM10 <\/a>as designed by Anders Martinsson, except with Mivoc AWM104 drivers instead of B&amp;C 10NW64. I don&#8217;t remember modifying anything besides the drivers. I went with these drivers because I think they were about a third the price, they have 9mm xmax and they were available in 4 ohm. They model okay down to 60Hz in a THAM10 enclosure &#8211; a little more peaky in the bass, but also less efficient outside of the horn response so less noise there and therefore a little easier to cross over. Hornresp modelled response and max SPL at Pmax&amp;xmax with AWM104 (black) vs original 10NW64 design (grey):<\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:image {\"id\":1013,\"width\":\"425px\",\"height\":\"auto\",\"sizeSlug\":\"full\",\"linkDestination\":\"none\"} -->\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"605\" height=\"454\" src=\"https:\/\/invar.nl\/projects\/wp-content\/uploads\/2025\/07\/THAM10-AWM104-vs-10NW64.png\" alt=\"\" class=\"wp-image-1013\" style=\"width:425px;height:auto\" srcset=\"https:\/\/invar.nl\/projects\/wp-content\/uploads\/2025\/07\/THAM10-AWM104-vs-10NW64.png 605w, https:\/\/invar.nl\/projects\/wp-content\/uploads\/2025\/07\/THAM10-AWM104-vs-10NW64-300x225.png 300w, https:\/\/invar.nl\/projects\/wp-content\/uploads\/2025\/07\/THAM10-AWM104-vs-10NW64-210x158.png 210w\" sizes=\"auto, (max-width: 605px) 100vw, 605px\" \/><\/figure>\n<!-- \/wp:image -->\n\n<!-- wp:image {\"id\":1014,\"width\":\"425px\",\"height\":\"auto\",\"sizeSlug\":\"full\",\"linkDestination\":\"none\"} -->\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"605\" height=\"454\" src=\"https:\/\/invar.nl\/projects\/wp-content\/uploads\/2025\/07\/THAM10-AWM104-vs-10NW64-max.png\" alt=\"\" class=\"wp-image-1014\" style=\"width:425px;height:auto\" srcset=\"https:\/\/invar.nl\/projects\/wp-content\/uploads\/2025\/07\/THAM10-AWM104-vs-10NW64-max.png 605w, https:\/\/invar.nl\/projects\/wp-content\/uploads\/2025\/07\/THAM10-AWM104-vs-10NW64-max-300x225.png 300w, https:\/\/invar.nl\/projects\/wp-content\/uploads\/2025\/07\/THAM10-AWM104-vs-10NW64-max-210x158.png 210w\" sizes=\"auto, (max-width: 605px) 100vw, 605px\" \/><\/figure>\n<!-- \/wp:image -->\n\n<!-- wp:paragraph -->\n<p>They actually sound pretty good for bass guitar with just a THAM10 and the 2&#215;6&#8243; top cabinet, without any crossover. Weight is about 16kg each (10kg wood, 6kg driver). I powered them using a Behringer iNuke NU1000. Iirc, one of the cabs rattles a bit at full volume. <\/p>\n<!-- \/wp:paragraph --><\/div><\/li>\n<li><a class=\"wp-block-latest-posts__post-title\" href=\"https:\/\/invar.nl\/?p=1005\">2&#215;6&#8243; two-way horn reflex bass practice cabinet<\/a><time datetime=\"2025-07-27T16:26:49+02:00\" class=\"wp-block-latest-posts__post-date\">27 July 2025<\/time><div class=\"wp-block-latest-posts__post-full-content\"><!-- wp:paragraph -->\n<p>January 2015, text\/instructions from back then too. I&#8217;m a little sad that I mounted the tweeter up top, and not in the middle as a &#8220;nose&#8221; with little teeth as drawn as an option in the cutsheet picture. Still, I love how it sounds for bass guitar. Still a great practice amp, only thing I changed since 2015 is put little wheels under it. Might one day make it active by putting a plate amp in the back.<\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:paragraph -->\n<p><em>2x Fane Sovereign 6-100, 1x Mivoc XGH 258 ALU<br>4 ohm, 96 dB\/W, 200W RMS, -3dB @ ~75Hz<br>Passive crossover @ 2550Hz (with switch)<br>25x35x35cm, 8.4kg<\/em><br><br>For this 2&#215;6&#8243; top cab, I was mainly inspired by Arjank&#8217;s <a href=\"https:\/\/www.talkbass.com\/threads\/piccolo8-cab-build-for-piccolo-bass.1010311\/\">Piccolo8<\/a> horn reflex cab, since I really liked the clarity of bass lines on my small horn reflex bookshelf speakers. I was also inspired by <a href=\"http:\/\/greenboy.us\/\" target=\"_blank\" rel=\"noreferrer noopener\">greenboy&#8217;s<\/a> cabs that have 6&#8243; mids and a tweeter as a vital part of the sound. I was also inspired by Bill Fitzmaurice&#8217;s <a href=\"http:\/\/www.billfitzmaurice.com\/XFCabs.html\" target=\"_blank\" rel=\"noreferrer noopener\">XF guitar cabs<\/a> that mount two speakers in a cross-firing position and with a rear tilted baffle. I designed the cab using Hornresp. When I&#8217;d finished it, it was a bit peaky in the 100-300Hz region but after stuffing the driver volume it sounded a lot better.<br><br>At practice volume, the 2&#215;6&#8243; goes low enough on its own. Over ~40W, I needs a high pass filter &gt;150Hz to keep from farting out (xmax) and I add one or two of the TH cabs.<br><\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:image {\"id\":1009,\"width\":\"466px\",\"height\":\"auto\",\"sizeSlug\":\"full\",\"linkDestination\":\"none\"} -->\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"480\" src=\"https:\/\/invar.nl\/projects\/wp-content\/uploads\/2025\/07\/P1350280.jpg\" alt=\"\" class=\"wp-image-1009\" style=\"width:466px;height:auto\" srcset=\"https:\/\/invar.nl\/projects\/wp-content\/uploads\/2025\/07\/P1350280.jpg 640w, https:\/\/invar.nl\/projects\/wp-content\/uploads\/2025\/07\/P1350280-300x225.jpg 300w, https:\/\/invar.nl\/projects\/wp-content\/uploads\/2025\/07\/P1350280-210x158.jpg 210w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><\/figure>\n<!-- \/wp:image -->\n\n<!-- wp:paragraph -->\n<p>&#8212; Wood &#8212;<br>This design uses 12mm plywood. If you are REALLY careful, you can cut all but<br>the tweeter baffle from a quarter sheet (1220x610x12mm). See the cut sheet in<br>the Sketchup file.<br>The entire driver enclosure is tilted backward 9 degrees compared to the horn<br>port. The two 6&#8243; drivers are crossed inward at 20 degrees each. NOTE: the two<br>baffle pieces, the piece at the top of the baffle and the top part of the cab<br>therefore have a few 9 or 20 degree cut angles that you should not overlook!<\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:image {\"id\":1006,\"width\":\"477px\",\"height\":\"auto\",\"sizeSlug\":\"full\",\"linkDestination\":\"none\"} -->\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"832\" height=\"606\" src=\"https:\/\/invar.nl\/projects\/wp-content\/uploads\/2025\/07\/2x6-horn-reflex.png\" alt=\"\" class=\"wp-image-1006\" style=\"width:477px;height:auto\" srcset=\"https:\/\/invar.nl\/projects\/wp-content\/uploads\/2025\/07\/2x6-horn-reflex.png 832w, https:\/\/invar.nl\/projects\/wp-content\/uploads\/2025\/07\/2x6-horn-reflex-300x219.png 300w, https:\/\/invar.nl\/projects\/wp-content\/uploads\/2025\/07\/2x6-horn-reflex-768x559.png 768w, https:\/\/invar.nl\/projects\/wp-content\/uploads\/2025\/07\/2x6-horn-reflex-210x153.png 210w\" sizes=\"auto, (max-width: 832px) 100vw, 832px\" \/><\/figure>\n<!-- \/wp:image -->\n\n<!-- wp:paragraph -->\n<p>&#8212; Drivers &#8212;<br>This design uses two Fane Sovereign 6-100 6&#8243; drivers. The volume behind the<br>drivers and the length of the horn are based on Hornresp simulations of the<br>frequency response of the cab with these particular drivers in it. Using<br>different drivers will have a very big impact on the frequency response of<br>the cab; you will probably get a big thump around 150Hz and not much response<br>in the frequencies below that. At the bottom of this file, you will find the<br>Hornresp values that I used if you wish to try modelling different drivers.<br>That said, the tweeter (Mivoc XGH 258 ALU) could be replaced by a different<br>model or even omitted. If you go for a different model tweeter, you may need<br>to change the crossover.<br>My cab benefitted a lot from stuffing the volume behind the drivers with the<br>insides of a pillow. You could also use actual BAF wadding or wool, and\/or<br>line the inside with felt. This will help dampen unwanted sound reflections.<\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:image {\"id\":1007,\"width\":\"473px\",\"height\":\"auto\",\"sizeSlug\":\"full\",\"linkDestination\":\"none\"} -->\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"438\" src=\"https:\/\/invar.nl\/projects\/wp-content\/uploads\/2025\/07\/HR2x6.png\" alt=\"\" class=\"wp-image-1007\" style=\"width:473px;height:auto\" srcset=\"https:\/\/invar.nl\/projects\/wp-content\/uploads\/2025\/07\/HR2x6.png 640w, https:\/\/invar.nl\/projects\/wp-content\/uploads\/2025\/07\/HR2x6-300x205.png 300w, https:\/\/invar.nl\/projects\/wp-content\/uploads\/2025\/07\/HR2x6-210x144.png 210w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><\/figure>\n<!-- \/wp:image -->\n\n<!-- wp:paragraph -->\n<p>&#8212; Crossover &#8212;<br>The crossover that I used is a simple passive second order crossover around<br>2550Hz. The woofers have a combined impedance of 16 ohms around this<br>frequency and the tweeter as well. I used a 3.9uF capacitor and a 1.0mH<br>inductor for both the low pass and the high pass sieds. Make sure the<br>capacitor is bipolar and the inductor is of reasonably low resistance. I am<br>new to crossover design though so I&#8217;m sure there are better ways to go about<br>it.<\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:paragraph -->\n<p>&#8212; Crossover switch &#8212;<br>If you want to be able to switch between running the 6&#8243; drivers full range,<br>or adding the tweeter via the crossover, use a rotary switch. I&#8217;ve used a<br>4P3T rotary switch that in the third switch position adds an 8 ohm resistor<br>in series with the tweeter. This pads the tweeter a bit, but it also changes<br>the crossover point slightly so this is not the best way to pad the tweeter.<br>I mounted the rotary switch in the horn mouth, where you can easily access<br>it.<\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:image {\"id\":1008,\"width\":\"422px\",\"height\":\"auto\",\"sizeSlug\":\"full\",\"linkDestination\":\"none\"} -->\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"867\" height=\"1000\" src=\"https:\/\/invar.nl\/projects\/wp-content\/uploads\/2025\/07\/2x6-filter-switch.png\" alt=\"\" class=\"wp-image-1008\" style=\"width:422px;height:auto\" srcset=\"https:\/\/invar.nl\/projects\/wp-content\/uploads\/2025\/07\/2x6-filter-switch.png 867w, https:\/\/invar.nl\/projects\/wp-content\/uploads\/2025\/07\/2x6-filter-switch-260x300.png 260w, https:\/\/invar.nl\/projects\/wp-content\/uploads\/2025\/07\/2x6-filter-switch-768x886.png 768w, https:\/\/invar.nl\/projects\/wp-content\/uploads\/2025\/07\/2x6-filter-switch-182x210.png 182w\" sizes=\"auto, (max-width: 867px) 100vw, 867px\" \/><\/figure>\n<!-- \/wp:image -->\n\n<!-- wp:paragraph -->\n<p>&#8212; Using the cab &#8212;<br>If you use the cab on its own, note that it will fart out if you push more<br>than approx. 40W into it. If you wish to get more output, you can add a high<br>pass filter and cross over the lower frequencies to a different cab. That<br>way, the cab can handle about 200W. I use a tapped horn cab crossed over to<br>the 2&#215;6&#8243; cab around 175Hz. The TH design that I used (THAM10) is freely<br>available on the website of Anders Martinsson, the designer, at<br>http:\/\/www.martinsson.cc\/<\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:paragraph -->\n<p>&#8212; A suitable amplifier &#8212;<br>If you wish to make the cab into a combo, or just want to have a small amp<br>for it, I recommend looking into the TPA3116D2 amplifier. You can order a<br>board cheaply from China (&lt;$20) and its output is perfect for this cab. If<br>you use a 19V laptop power supply, it can push about 35W into the cab at<br>below 0.1% distortion. With a 24V power supply you could get about 60W out<br>of it. If you run in PBTL mode, it is 2 ohm stable and you could get up to<br>100W if you add another cab.<br>You can set the gain at either 20, 26, 32 or 36 dB. With both pickups at<br>100% on my jazz bass, I found that the gain was enough to practice without a<br>preamp, but I recommend setting the gain to 32 if you have a passive bass<br>and will not be using a separate preamp. More on this amp at diyAudio here:<br>http:\/\/www.diyaudio.com\/wiki\/TPA3116D2_Boards<\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:paragraph -->\n<p>&#8212; Hornresp input data &#8212;<br>Ang 2.0 x Pi<br>Eg 2.00<br>S1 70.00 S2 280.00 Con 47.00<\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:paragraph -->\n<p>Sd 139.20 Cms 8.00E-05 Mmd 23.94 Re 6.90<br>Bl 13.25 Rms 1.35 Le 1.15 Nd 2P<\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:paragraph -->\n<p>Vrc 0.00 Ap 255.00 Vtc 8500.00<br>Lrc 0.00 Lpt 0.00 Atc 500.00<\/p>\n<!-- \/wp:paragraph --><\/div><\/li>\n<li><a class=\"wp-block-latest-posts__post-title\" href=\"https:\/\/invar.nl\/?p=1000\">FRS8 horn reflex<\/a><time datetime=\"2025-07-27T16:09:39+02:00\" class=\"wp-block-latest-posts__post-date\">27 July 2025<\/time><div class=\"wp-block-latest-posts__post-full-content\"><!-- wp:paragraph -->\n<p>I think I built these in 2014. They&#8217;re a copy of the &#8220;<a href=\"https:\/\/zelfbouwaudio.nl\/forum\/viewtopic.php?t=15342\">Leuk &amp; simpel hoorn reflex monitortje met FRS8<\/a>&#8221; project by meiborg on zelfbouwaudio.nl forum. I first wanted to modify it into a triangular shape because of my room at the time, but decided against it because I didn&#8217;t have the woodworking tools or skills required.<\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:image {\"id\":1001,\"width\":\"325px\",\"height\":\"auto\",\"sizeSlug\":\"full\",\"linkDestination\":\"none\"} -->\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"450\" height=\"369\" src=\"https:\/\/invar.nl\/projects\/wp-content\/uploads\/2025\/07\/driehoek-1.png\" alt=\"\" class=\"wp-image-1001\" style=\"width:325px;height:auto\" srcset=\"https:\/\/invar.nl\/projects\/wp-content\/uploads\/2025\/07\/driehoek-1.png 450w, https:\/\/invar.nl\/projects\/wp-content\/uploads\/2025\/07\/driehoek-1-300x246.png 300w, https:\/\/invar.nl\/projects\/wp-content\/uploads\/2025\/07\/driehoek-1-210x172.png 210w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/figure>\n<!-- \/wp:image -->\n\n<!-- wp:paragraph -->\n<p>They use a Visaton FRS8 full range driver, and a horn reflex port to bring the response down to about 100Hz. I like how they sound, I even built someone a second set as a gift.<\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:image {\"id\":1002,\"width\":\"446px\",\"height\":\"auto\",\"sizeSlug\":\"full\",\"linkDestination\":\"none\"} -->\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"667\" src=\"https:\/\/invar.nl\/projects\/wp-content\/uploads\/2025\/07\/P1340117.jpg\" alt=\"\" class=\"wp-image-1002\" style=\"width:446px;height:auto\" srcset=\"https:\/\/invar.nl\/projects\/wp-content\/uploads\/2025\/07\/P1340117.jpg 1000w, https:\/\/invar.nl\/projects\/wp-content\/uploads\/2025\/07\/P1340117-300x200.jpg 300w, https:\/\/invar.nl\/projects\/wp-content\/uploads\/2025\/07\/P1340117-768x512.jpg 768w, https:\/\/invar.nl\/projects\/wp-content\/uploads\/2025\/07\/P1340117-210x140.jpg 210w\" sizes=\"auto, (max-width: 980px) 100vw, 980px\" \/><\/figure>\n<!-- \/wp:image -->\n\n<!-- wp:image {\"id\":1003,\"width\":\"448px\",\"height\":\"auto\",\"sizeSlug\":\"full\",\"linkDestination\":\"none\"} -->\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"667\" src=\"https:\/\/invar.nl\/projects\/wp-content\/uploads\/2025\/07\/P1340121.jpg\" alt=\"\" class=\"wp-image-1003\" style=\"width:448px;height:auto\" srcset=\"https:\/\/invar.nl\/projects\/wp-content\/uploads\/2025\/07\/P1340121.jpg 1000w, https:\/\/invar.nl\/projects\/wp-content\/uploads\/2025\/07\/P1340121-300x200.jpg 300w, https:\/\/invar.nl\/projects\/wp-content\/uploads\/2025\/07\/P1340121-768x512.jpg 768w, https:\/\/invar.nl\/projects\/wp-content\/uploads\/2025\/07\/P1340121-210x140.jpg 210w\" sizes=\"auto, (max-width: 980px) 100vw, 980px\" \/><\/figure>\n<!-- \/wp:image -->\n\n<!-- wp:paragraph -->\n<p><\/p>\n<!-- \/wp:paragraph --><\/div><\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>Speaker projects from before this blog.<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":26,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-998","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/invar.nl\/index.php?rest_route=\/wp\/v2\/pages\/998","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/invar.nl\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/invar.nl\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/invar.nl\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/invar.nl\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=998"}],"version-history":[{"count":1,"href":"https:\/\/invar.nl\/index.php?rest_route=\/wp\/v2\/pages\/998\/revisions"}],"predecessor-version":[{"id":999,"href":"https:\/\/invar.nl\/index.php?rest_route=\/wp\/v2\/pages\/998\/revisions\/999"}],"up":[{"embeddable":true,"href":"https:\/\/invar.nl\/index.php?rest_route=\/wp\/v2\/pages\/26"}],"wp:attachment":[{"href":"https:\/\/invar.nl\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=998"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}