Reply to thread

Message

<blockquote data-quote="squeak9798" data-source="post: 2490323" data-attributes="member: 555320">That&#039;s a great idea for a 3-way frontstage.&nbsp; Completely agreed there.However, you can&#039;t inherently take those same concepts and transpose them down to a large-midwoofer based 2-way system.&nbsp; For one beaming issues will begin taking affect sooner; that driver is -5db down at 3khz at 30* off-axis and nearly -10db down @ 3khz @ 60* off-axis....and being in a vehicle you can bet they&#039;ll be aimed off-axis....in doors being 60* off-axis isn&#039;t an unreasonable assumption.&nbsp; Obviously this doesn&#039;t take vehicle acoustics into account.....but based simply on physics beaming for a 7&quot; driver is going be an issue in the 3khz and above region.Likewise, running higher is going to push you closer or into the drivers breakup nodes (given most larger diameter mids will begin to break up at a much lower frequency than a 3&quot; mid), increasing distortion and frequency response anomolies.Given the tweeters FS of 1170hz, and the &quot;rule of thumb&quot; to keep the xover for the tweeter 1 octave above.....I would start highpassing the tweeter/lowpassing the mid around 2.3-2.5khz @ 18db-24db/oct and go from there.If you have access to an RTA, it would do wonders for you aswell.</blockquote>

[QUOTE="squeak9798, post: 2490323, member: 555320"] That's a great idea for a 3-way frontstage. Completely agreed there. However, you can't inherently take those same concepts and transpose them down to a large-midwoofer based 2-way system. For one beaming issues will begin taking affect sooner; that driver is -5db down at 3khz at 30* off-axis and nearly -10db down @ 3khz @ 60* off-axis....and being in a vehicle you can bet they'll be aimed off-axis....in doors being 60* off-axis isn't an unreasonable assumption. Obviously this doesn't take vehicle acoustics into account.....but based simply on physics beaming for a 7" driver is going be an issue in the 3khz and above region. Likewise, running higher is going to push you closer or into the drivers breakup nodes (given most larger diameter mids will begin to break up at a much lower frequency than a 3" mid), increasing distortion and frequency response anomolies. Given the tweeters FS of 1170hz, and the "rule of thumb" to keep the xover for the tweeter 1 octave above.....I would start highpassing the tweeter/lowpassing the mid around 2.3-2.5khz @ 18db-24db/oct and go from there. If you have access to an RTA, it would do wonders for you aswell. [/QUOTE]

Verification