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
PA Top with AMT
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="Moritz Bachmann" data-source="post: 213796" data-attributes="member: 13680"><p>time to update this thread, since we did a lot of development during this quarantine time.</p><p>We finished our final Protoype. MTM alignment, made of 15mm poplar, braced with an Carbon- Epoxy layer outside. We desided to go with the 12in but lower the Volume to ~18L and to build the enclosure without any parallel Walls.</p><p></p><p>Unfortunately we had to move into a room for testing, so we did only neafield measurements, 1-2cm from the cone to the mic.</p><p></p><p>The first pic shows the frequenzy response with different EQ Points.: 1. without EQ, 2. with a 8dB high shelf at780Hz and a 10dB Bell at 87.5Hz. the 3.-5 show always one more EQ point to minimize those breakins in the higher frequencies.</p><p></p><p>Of course we would like to prevent them without EQ:</p><p>The second pic shows some of our stuffing tests with sheep wool and hemp, but we also tested classics like Sonofil or Bondum stuffing with only the 2 main EQ pointsactive.</p><p>we couldn´t measure big differences between them, they dont even look that much better than the unstuffed box... maybe because the enclosure design has no parallel walls and reflections are already minimized? Of course except those big break downs at 750Hz, 1160Hz and so on... what are your explainations/ preventing tips for them?</p><p>-We tried to solve them with an internal diffusor out of MDF on the back, but it seems that it doesn´t function the way we would like it, so tomorrow we will try it with another diffusor on the paces in the enclosure.</p><p></p><p>What are your thought about our design and testing results, do you know better stuffings or how to place them?</p><p></p><p>hope you all stay healthy!</p></blockquote><p></p>
[QUOTE="Moritz Bachmann, post: 213796, member: 13680"] time to update this thread, since we did a lot of development during this quarantine time. We finished our final Protoype. MTM alignment, made of 15mm poplar, braced with an Carbon- Epoxy layer outside. We desided to go with the 12in but lower the Volume to ~18L and to build the enclosure without any parallel Walls. Unfortunately we had to move into a room for testing, so we did only neafield measurements, 1-2cm from the cone to the mic. The first pic shows the frequenzy response with different EQ Points.: 1. without EQ, 2. with a 8dB high shelf at780Hz and a 10dB Bell at 87.5Hz. the 3.-5 show always one more EQ point to minimize those breakins in the higher frequencies. Of course we would like to prevent them without EQ: The second pic shows some of our stuffing tests with sheep wool and hemp, but we also tested classics like Sonofil or Bondum stuffing with only the 2 main EQ pointsactive. we couldn´t measure big differences between them, they dont even look that much better than the unstuffed box... maybe because the enclosure design has no parallel walls and reflections are already minimized? Of course except those big break downs at 750Hz, 1160Hz and so on... what are your explainations/ preventing tips for them? -We tried to solve them with an internal diffusor out of MDF on the back, but it seems that it doesn´t function the way we would like it, so tomorrow we will try it with another diffusor on the paces in the enclosure. What are your thought about our design and testing results, do you know better stuffings or how to place them? hope you all stay healthy! [/QUOTE]
Insert quotes…
Verification
Post reply
Home
Forums
Low Earth Orbit
DIY Audio
PA Top with AMT
Top
Bottom
Sign-up
or
log in
to join the discussion today!