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Low Earth Orbit
DIY Audio
New DIY Mid High (90deg) - AKA PM90
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<blockquote data-quote="Peter Morris" data-source="post: 139011" data-attributes="member: 652"><p>Re: New DIY Mid High</p><p></p><p></p><p></p><p><span style="font-size: 15px">[SUB]<span style="font-family: 'tahoma'"><span style="color: #000000">This is what I used - </span><a href="http://www.plyco.com.au/index.php?main_page=product_info&cPath=48_49&products_id=142" target="_blank"><span style="color: #0000ff">http://www.plyco.com.au/index.php?main_page=product_info&cPath=48_49&products_id=142</span></a></span></span></p><p><span style="font-size: 15px"><span style="font-family: 'tahoma'"></span></span></p><p><span style="font-size: 15px"><span style="font-family: 'tahoma'"><span style="color: #000000">It’s not good timber, but it was cheap, light and reasonably thick and I was building a prototype. To get this project to work you need to keep the weight down.</span></span></span></p><p><span style="font-size: 15px"><span style="font-family: 'tahoma'"></span></span></p><p><span style="font-size: 15px"><span style="font-family: 'tahoma'"><span style="color: #000000">19mm would make it too heavy; I think you could get away with 15mm everywhere with some careful bracing. I would not use 12mm. Can you get 5/8 of an inch ply (16mm) ?</span></span></span></p><p><span style="font-size: 15px"><span style="font-family: 'tahoma'"><span style="color: #000000"></span></span></span></p><p><span style="font-size: 15px"><span style="font-family: 'tahoma'"><span style="color: #000000">I used some pieces of pine 19mm x 40mm on edge to brace the sides.</span></span></span></p><p><span style="font-size: 15px"><span style="font-family: 'tahoma'"><span style="color: #000000"></span></span></span></p><p><span style="font-size: 15px"><span style="font-family: 'tahoma'"><span style="color: #000000">What I do as a crude test is tap or knock on all parts of the box (like you knock on a door). It should make a dull thud; if you feel or hear some resonance then you need to add bracing. </span></span></span></p><p><span style="font-size: 15px"><span style="font-family: 'tahoma'"><span style="color: #000000"></span></span></span></p><p><span style="font-size: 15px"><span style="font-family: 'tahoma'"><span style="color: #000000">The box volume is not particularly critical in terms of handles and bracing. </span></span></span></p><p><span style="font-size: 15px"><span style="font-family: 'tahoma'"><span style="color: #000000"></span></span></span></p><p><span style="font-size: 15px"><span style="font-family: 'tahoma'"><span style="color: #000000">Just double check the compression driver will fit between the two 12" drivers before you glue it together -- its very close in there.</span></span></span></p><p><span style="font-size: 15px"><span style="font-family: 'tahoma'"><span style="color: #000000"></span></span></span></p><p><span style="font-size: 15px"><span style="font-family: 'tahoma'"><span style="color: #000000">@ Don ... the HF950 is shown 50 x 90 ... not 90 x 50 - no need to change it ... the horn mouth is square <img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f642.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=":)" title="Smile :)" data-smilie="1"data-shortname=":)" />~<img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f642.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=":-)" title="Smile :-)" data-smilie="1"data-shortname=":-)" />~:smile:</span></span>[/SUB]</span></p></blockquote><p></p>
[QUOTE="Peter Morris, post: 139011, member: 652"] Re: New DIY Mid High [SIZE=4][SUB][FONT=tahoma][COLOR=#000000]This is what I used - [/COLOR][URL="http://www.plyco.com.au/index.php?main_page=product_info&cPath=48_49&products_id=142"][COLOR=#0000ff]http://www.plyco.com.au/index.php?main_page=product_info&cPath=48_49&products_id=142[/COLOR][/URL] [COLOR=#000000]It’s not good timber, but it was cheap, light and reasonably thick and I was building a prototype. To get this project to work you need to keep the weight down.[/COLOR] [COLOR=#000000]19mm would make it too heavy; I think you could get away with 15mm everywhere with some careful bracing. I would not use 12mm. Can you get 5/8 of an inch ply (16mm) ?[/COLOR] [COLOR=#000000] I used some pieces of pine 19mm x 40mm on edge to brace the sides. [/COLOR] [COLOR=#000000]What I do as a crude test is tap or knock on all parts of the box (like you knock on a door). It should make a dull thud; if you feel or hear some resonance then you need to add bracing. [/COLOR] [COLOR=#000000] The box volume is not particularly critical in terms of handles and bracing. Just double check the compression driver will fit between the two 12" drivers before you glue it together -- its very close in there. @ Don ... the HF950 is shown 50 x 90 ... not 90 x 50 - no need to change it ... the horn mouth is square :)~:-)~:smile:[/COLOR][/FONT][/SUB][/SIZE] [/QUOTE]
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