|Multi-Way Conventional loudspeakers with crossovers|
Please consider donating to help us continue to serve you.
Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
||Thread Tools||Search this Thread|
|8th February 2009, 12:26 AM||#1|
Join Date: Oct 2008
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,
|Thread Tools||Search this Thread|
|Thread||Thread Starter||Forum||Replies||Last Post|
|Need some Help with Unibox||LetGoMyEggo||Everything Else||3||3rd March 2009 04:10 PM|
|Help with Unibox||todd95008||Multi-Way||4||15th June 2008 03:38 PM|
|Unibox||rinx||Multi-Way||8||5th November 2007 05:38 AM|
|unibox||pkgum||Multi-Way||11||2nd July 2006 07:36 PM|
|Am I using UniBox correctly?||needtubes||Subwoofers||3||12th June 2005 03:02 AM|
|New To Site?||Need Help?|