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="Uwe Riemer" data-source="post: 213481" data-attributes="member: 394"><p>The far field measurement will differ from the near field, the job is to learn how to use both.</p><p></p><p>Re ports:</p><p>Larger port area will contribute more SPL, one can see this in Hornresponse Sim by using the backloaded horn to simulate the vented design.</p><p>Larger ports will become longer for the same tuning, port resonances go lower. </p><p>As always there is no free lunch:</p><p>If the vented enclosure is used for mid range also, long ports are not a good idea IMO.</p><p>The chuffing of the small port is not as important, if the mid range device will be high passed above tuning when using a dedicated subwoofer.</p><p></p><p>For the smallish port I found, that there is less gain in reality than some SIM programs suggest, so it´s easy to overdo the tuning in the quest for more effect.</p><p>Tuning too high will make the box sound boomy.</p><p></p><p>Re the drop in SPL around 900 Hz:</p><p>Measure under a lot of different angles ( always a good idea ) and see what happens.</p></blockquote><p></p>
[QUOTE="Uwe Riemer, post: 213481, member: 394"] The far field measurement will differ from the near field, the job is to learn how to use both. Re ports: Larger port area will contribute more SPL, one can see this in Hornresponse Sim by using the backloaded horn to simulate the vented design. Larger ports will become longer for the same tuning, port resonances go lower. As always there is no free lunch: If the vented enclosure is used for mid range also, long ports are not a good idea IMO. The chuffing of the small port is not as important, if the mid range device will be high passed above tuning when using a dedicated subwoofer. For the smallish port I found, that there is less gain in reality than some SIM programs suggest, so it´s easy to overdo the tuning in the quest for more effect. Tuning too high will make the box sound boomy. Re the drop in SPL around 900 Hz: Measure under a lot of different angles ( always a good idea ) and see what happens. [/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!