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Multi-Way Conventional loudspeakers with crossovers

Am I using Unibox correctly?
Am I using Unibox correctly?
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Old 7th February 2009, 11:26 PM   #1
zimjj is offline zimjj  United States
diyAudio Member
Join Date: Oct 2008
Default Am I using Unibox correctly?

Iím looking at mating my center channel design (51/4Ē Revelator / Hiquphon tweeter) with a woofer to make a pair of mains. I figured I could cross over around 200 Hz. I wanted to try the ScanSpeak 9Ē 23W / 4557T00. The Madisound website suggests pairing it with its passive radiator the ScanSpeak 23W / 0-00-00 in a 1 cf box.

I modeled it in unibox and got an F3 of 26.5hz with 140 watts / walls covered / no leaks. That looked pretty good but I got cone excursion problems at 35 Hz. I played with the mass of the pr and if I took it down to 200gm (half the spec ) it looked pretty good, but I have no idea how much weight you can remove, if any, from that pr.

I then tried reducing the volume and at 20L it looked pretty good (F3 of 28.3hz), but when I started sizing the box, getting two 9Ē speakers to fit seemed pretty sporty. I wanted them to both point forward, I definitely donít want one in the side wall. If I put the pr in the back Iím afraid the box might be too shallow.

I donít have permission from my Chancellor of the Exchequer to start a new project at all, let alone an expensive one! So right know I just want to learn the process.

So, any comments on those two designs?

Then I have some general unibox questions-

First and foremost Ė am I even running unibox correctly?
What does the impedance curve tell me about the design?
What do the Step Response and Power Amplifier peak voltage tell me?

Lastly - looking at the spl curve where all contributors are plotted I was surprised to see the excursion drop off rapidly at the low frequencies and more surprised that the contribution of the pr added to make the total spl respectable. I wouldn't have thought the pr would add, since I assumed it was out of phase.

Iíve pasted the T/S parameters into an attached text doc.

I will certainly appreciate any advice,

Attached Files
File Type: txt unibox_inputs.txt (504 Bytes, 10 views)
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