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Old Today, 10:15 AM   #641
Mazza is offline Mazza  Australia
diyAudio Member
Join Date: Jul 2013
Default Designing for dual woofers?

Dear Mr Waslo and all,

I have a very nice pair of Klipsch KG 5.5's that I want to improve. These are a TWW system; horn loaded dome tweeter with a pair of 10"woofers in a two way arrangement.

I understand that dual woofers in a two way means lobing in the vertical axis.

My question then is; is it possible to improve the system keeping the 2 way configuration through the crossover?

Some data attached to show my approach:

Measured the woofers look like this:

XSim free crossover designer-kg-woofer-comparison-jpg

The both woofers running simultaneously have a big dip between 1.5 and 2k that is affecting speaker with the original crossover:

XSim free crossover designer-kg-5-5-xsim-original-crossover-graph-jpg

And yes, these are way HOT to my ears!

Here's the original crossover:

XSim free crossover designer-kg-5-5-xsim-original-crossover-schematic-jpg

My solution to this is as follows:

XSim free crossover designer-kg-5-5-xsim-crossover-schematic-jpg

The result is much improved:

XSim free crossover designer-kg-5-5-xsim-crossover-graph-jpg

What I am keen to know then is if the woofer lobing can be effectively fixed with this crossover or am I just optimising at the measured distance? Put another way, is the dual woofer arrangement still causing problems that may not be evident in my crossover simulated response?

DXO attached for reference.

Attached Images
File Type: jpg KG woofer comparison.jpg (121.4 KB, 37 views)
File Type: jpg KG 5.5 XSim new crossover graph.jpg (109.6 KB, 36 views)
File Type: jpg KG 5.5 XSim new crossover schematic.jpg (59.3 KB, 37 views)
File Type: jpg KG 5.5 XSim original crossover schematic.jpg (44.7 KB, 37 views)
File Type: jpg KG 5.5 XSim original crossover graph.jpg (106.6 KB, 29 views)
Attached Files
File Type: dxo 2 Way Crossover.dxo (113.0 KB, 0 views)

Last edited by Mazza; Today at 10:24 AM.
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Old Today, 03:52 PM   #642
mwmkravchenko is offline mwmkravchenko  Canada
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Join Date: Jan 2002
Location: Perth Canada
Hello Mazza.

Just throwing out an idea. Any problem with turning the system into a 2.5 way? Second woofer closer to the floor gets a low pass?
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Old Today, 04:03 PM   #643
perceval is online now perceval  Taiwan
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Join Date: Feb 2014
Location: Taiwan
your new XO looks a 1000 times better than the old, in the FR department.

How about the step response and the impulse with the new XO, how does that look?
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