Log in
Register
Home
Forums
New posts
Search forums
What's new
New posts
New profile posts
Latest activity
News
Members
Current visitors
New profile posts
Search profile posts
Features
Log in
Register
Search
Search titles only
By:
Search titles only
By:
New posts
Search forums
Menu
Install the app
Install
Reply to thread
Home
Forums
Low Earth Orbit
DIY Audio
60 Degree DIY Mid Hi - AKA PM60
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Message
<blockquote data-quote="Peter Morris" data-source="post: 12390" data-attributes="member: 652"><p><span style="font-family: 'Calibri'"><span style="font-size: 12px"><span style="color: #000000">Hi Everyone,</span></span></span></p><p><span style="font-family: 'Calibri'"><span style="font-size: 12px"><span style="color: #000000"></span></span></span></p><p><span style="font-family: 'Calibri'"><span style="font-size: 12px"><span style="color: #000000">I have started work on the 60 degree version. Don has helped once again and provided some preliminary CAD drawings. A bit of work is still needed to simplify the construction and finalize the dimensions.</span></span></span></p><p><span style="font-family: 'Calibri'"><span style="font-size: 12px"><span style="color: #000000"></span></span></span></p><p><span style="font-family: 'Calibri'"><span style="font-size: 12px"><span style="color: #000000">The original DIY was a prototype designed to test the design and concept; this time I’m planning to make a “proper box” and provide some more construction details and drawings from the start.</span></span></span></p><p><span style="font-family: 'Calibri'"><span style="font-size: 12px"><span style="color: #000000"></span></span></span></p><p><span style="font-family: 'Calibri'"><span style="font-size: 12px"><span style="color: #000000">The 60 degree version will be about 20mm deeper than the 90 degree version because of the extra depth of the Eighteen Sound XT1464 horn. I may also have to make the box about 8mm wider. To offset the slight increase in size I plan to cut the back corners off. This is mostly cosmetic a should make the box look smaller from most angles.</span></span></span></p><p><span style="font-family: 'Calibri'"><span style="font-size: 12px"><span style="color: #000000"></span></span></span></p><p><span style="font-family: 'Calibri'"><span style="font-size: 12px"><span style="color: #000000">It’s likely that the 60 degree version will be used in pairs, accordingly I have done a SIM for two boxes at the AES peak power (+6 dB on the RMS rating). To do this I modelled one box in half space.</span></span></span></p><p><span style="font-family: 'Calibri'"><span style="font-size: 12px"><span style="color: #000000"></span></span></span></p><p><span style="font-family: 'Calibri'"><span style="font-size: 12px"><span style="color: #000000">I thought it would be appropriate to start a new thread which is more focused on the construction of the box unlike the original DIY Mid Hi thread – Bennett I hope that’s OK.</span></span></span></p><p><span style="font-family: 'Calibri'"><span style="font-size: 12px"><span style="color: #000000"></span></span></span></p><p><span style="font-size: 12px"><span style="color: #000000"><span style="font-family: 'Calibri'">I have provided some SIM’s using the RCF and the B&C's 12NDL76. It shows the power response (dark line) and the the SPL corrected for directivity (grey line).</span></span></span></p><p><span style="font-size: 12px"><span style="color: #000000"><span style="font-family: 'Calibri'"></span></span></span></p><p><span style="font-size: 12px"><span style="color: #000000"><span style="font-family: 'Calibri'"><em>Note: the low frequency section of SPL curve is my best guess; Horn Response can not model the directive of the reflex ports </em></span></span></span></p><p><span style="font-size: 12px"><span style="color: #000000"><span style="font-family: 'Calibri'"><em></em></span></span></span></p><p><span style="font-size: 12px"><span style="color: #000000"><span style="font-family: 'Calibri'">Peter</span></span></span></p></blockquote><p></p>
[QUOTE="Peter Morris, post: 12390, member: 652"] [FONT=Calibri][SIZE=3][COLOR=#000000]Hi Everyone, I have started work on the 60 degree version. Don has helped once again and provided some preliminary CAD drawings. A bit of work is still needed to simplify the construction and finalize the dimensions. [/COLOR][/SIZE][/FONT] [FONT=Calibri][SIZE=3][COLOR=#000000]The original DIY was a prototype designed to test the design and concept; this time I’m planning to make a “proper box” and provide some more construction details and drawings from the start. [/COLOR][/SIZE][/FONT] [FONT=Calibri][SIZE=3][COLOR=#000000]The 60 degree version will be about 20mm deeper than the 90 degree version because of the extra depth of the Eighteen Sound XT1464 horn. I may also have to make the box about 8mm wider. To offset the slight increase in size I plan to cut the back corners off. This is mostly cosmetic a should make the box look smaller from most angles. [/COLOR][/SIZE][/FONT] [FONT=Calibri][SIZE=3][COLOR=#000000]It’s likely that the 60 degree version will be used in pairs, accordingly I have done a SIM for two boxes at the AES peak power (+6 dB on the RMS rating). To do this I modelled one box in half space. [/COLOR][/SIZE][/FONT] [FONT=Calibri][SIZE=3][COLOR=#000000]I thought it would be appropriate to start a new thread which is more focused on the construction of the box unlike the original DIY Mid Hi thread – Bennett I hope that’s OK. [/COLOR][/SIZE][/FONT] [SIZE=3][COLOR=#000000][FONT=Calibri]I have provided some SIM’s using the RCF and the B&C's 12NDL76. It shows the power response (dark line) and the the SPL corrected for directivity (grey line). [I]Note: the low frequency section of SPL curve is my best guess; Horn Response can not model the directive of the reflex ports [/I] Peter[/FONT][/COLOR][/SIZE] [/QUOTE]
Insert quotes…
Verification
Post reply
Home
Forums
Low Earth Orbit
DIY Audio
60 Degree DIY Mid Hi - AKA PM60
Top
Bottom
Sign-up
or
log in
to join the discussion today!