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Old 7th April 2005, 03:03 AM   #1
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Question Help selecting components for active PA...

I am building a self-powered PA speaker with the following plate amp:

http://www.partsexpress.com/pe/pshow...00-797&scqty=1

I want to use a 10" driver with it and was considering this one:

http://www.partsexpress.com/pe/pshow...64-332&scqty=1

...and this tweeter:

http://www.partsexpress.com/pe/pshow...64-362&scqty=1

...and this crossover (correct crossover point?):

http://www.partsexpress.com/pe/pshow...90-636&scqty=1

Will these components work well with the amp? If not, what would work better and why? Got links?

What I'm not sure of is what power handling rating for the speakers I should be seeking for this amp (I know these ratings are largely nonsense, which makes it even more confusing!)

Trying to keep total cost on Woofer, Tweeter, and Crossover below $200 (the above components come out to about $110)

thanks for your help!!!
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Old 8th April 2005, 01:18 AM   #2
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This is a sort of difficult reply due to the nature of the design.

The plate amp you suggest is fine it should work well in the application you have stated in your previous post.

I would use this eminence 10" for the bass application. It has more then twice the xmax of the driver you have selected and eminence have a excellent reputation for delivering very good performance on a budget.

http://www.partsexpress.com/pe/pshow...03&ctab=2#Tabs

Then I would use this tweeter of the same make.

http://www.partsexpress.com/pe/showd...number=290-532

Now if I were to use those two drivers I would build a box mount them in it and measure them, then design a crossover specifically to suit their individual characteristics but that is not an option, which is where we come to the difficult part.

I dont know what the xovers are like provided by eminence but they are deffinately NOT designed specifically for the drivers you use.

1st, the woofer has a nasty rising response peak into the upper half of its passband, this is a problem because its exactly where you want to cross the tweeter in. If I were to use this driver I could easily deal with this but without software to measure your pretty much stuck. For this situation I would not worry about bafflestep.

Next is the tweeter, this looks as if it is a nice driver, good sensativity and a flat frequency response. The fact is that its some 10dB more sensative then the woofer, 16db more if you do factor in bafflestep. So this will also need to be compensated for.

I was going to use SPL trace to construct frd and zma files for the drivers from the manufactures specifications but they dont supply you with impedance plots which makes it kinda hard. I will do a bit of a search for good specifications that will allow me to draw up a rough xover that will work better then the one just "off the shelf"
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