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
Coaxial Wedge Collaboration
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="Michael John" data-source="post: 39017" data-attributes="member: 830"><p>Re: Coaxial Wedge Collaboration</p><p></p><p>Whilst waiting for the BMS driver, I thought I'd drop in an old 8 ohm 12" woofer and try some impedance sweeps. (After installing handles, dishes and some polyester filling.)</p><p></p><p>Can anyone help me interpret what I'm seeing from the sweeps? (Peak, Trough, Peak)</p><ul> <li data-xf-list-type="ul">A (as per v1.1 CAD design): 23.5 Hz, 46.6 Hz, 116 Hz</li> <li data-xf-list-type="ul">B (internal volume reduced by about 1.5 litres, to match the larger displacement of the BMS): 23.5Hz, 46 Hz, 116.8 Hz</li> <li data-xf-list-type="ul">C (A with port area reduced by about 23%): 21.3 Hz, 45.7 Hz, 113 Hz</li> <li data-xf-list-type="ul">D (A with port length reduced by 50mm): 25 Hz, 47 Hz, 115 Hz</li> </ul><p>(The impedance phase crosses 0 deg at these frequencies.)</p><p></p><p>I presume the 46 to 47 Hz is the port tuning?</p><p></p><p>I'd like to get it closer to 57 Hz and it did rise a little in D but this is still within my margin of error. Also, the original port length in A is consistent with a number of online bass reflex calculators.</p><p></p><p>Any ideas where I should go from here? Is this old driver inappropriate for this testing and should I just waiting until I have the BMS?</p><p></p><p>Many thanks,</p></blockquote><p></p>
[QUOTE="Michael John, post: 39017, member: 830"] Re: Coaxial Wedge Collaboration Whilst waiting for the BMS driver, I thought I'd drop in an old 8 ohm 12" woofer and try some impedance sweeps. (After installing handles, dishes and some polyester filling.) Can anyone help me interpret what I'm seeing from the sweeps? (Peak, Trough, Peak) [LIST] [*]A (as per v1.1 CAD design): 23.5 Hz, 46.6 Hz, 116 Hz [*]B (internal volume reduced by about 1.5 litres, to match the larger displacement of the BMS): 23.5Hz, 46 Hz, 116.8 Hz [*]C (A with port area reduced by about 23%): 21.3 Hz, 45.7 Hz, 113 Hz [*]D (A with port length reduced by 50mm): 25 Hz, 47 Hz, 115 Hz [/LIST](The impedance phase crosses 0 deg at these frequencies.) I presume the 46 to 47 Hz is the port tuning? I'd like to get it closer to 57 Hz and it did rise a little in D but this is still within my margin of error. Also, the original port length in A is consistent with a number of online bass reflex calculators. Any ideas where I should go from here? Is this old driver inappropriate for this testing and should I just waiting until I have the BMS? Many thanks, [/QUOTE]
Insert quotes…
Verification
Post reply
Home
Forums
Low Earth Orbit
DIY Audio
Coaxial Wedge Collaboration
Top
Bottom
Sign-up
or
log in
to join the discussion today!