Hey, I'm wondering if there are some kind souls that would like to help critique a speaker design I've been putting together. I've run through old posts and done some searching and the driver combination I'm thinking about using doesn't seem to be out there so I think this is somewhat fresh and should keep me out of trouble for asking.
The particulars of this design;
I'm wanting a 2-way system using a pair of drivers to control costs and keep it a little more simple (first timer and all). The design goal is to act as the only drivers for computer / small room use without the aid of a separate subwoofer. For power I've got an older Sony that is rated at 75 watts per channel to the mains. I'd like a smaller sized enclosure as I don't have tons of space. And to make this even more complicated, I'd like to use some Morel MDT-20's I already have from a previous project idea that never happened so they're sitting new in box. I know that's not the way to start a project but my hope is that this design restriction doesn't pose much of a problem.
To start, here's a link to the MDT-20 on Parts Express for those not familiar and want to check out the graphs and other specs;
Morel MDT-20
The driver I've been looking at to match with this tweet for this project is the Dayton RS180S-8. It seems like a good compromise and can reach up to near the MDT-20 without breaking up too badly. But that's what my eyes on the graph tell me; what do those with more experience think?
Dayton Audio RS180S-8
I'm not married to this driver by any means, although I do really like the shielding (even if it's not the best shielding ever, for this application I appreciate it) and the price of $35 each is good. I'm open to suggestions, for sure.
What I've come to on my xover is a want for steep roll off to keep these drivers from breaking up, while trying to get as much useful range out of them as possible. To that end, I configured a 24db/octave Linkwitz Riley as they seem fairly straightforward and don't carry with them an overly large number of required components. I figured on having the rolloff for the woofer start at 1700Hz and the tweet should come in at 2300Hz. I figured if the power is a little weak in that notch, I'm still in better shape than having the drivers overlap too strongly with a resultant peak. Thoughts?
The crossover layout as drawn up is here;
To keep this from getting too long as a thread starting post I'll skip my selected xover component values, although I've gone through with a couple online calculators and tried to work out some values. I then went through the Parts Express online catalog of Jantzen components and, using their 18 ga. air core inductors and their line of CrossCap capacitors, found the nearest available commercial values. I think it best to go that route instead of making approximated equal values to the computed values to keep thinks more simple for both construction and signal path.
The box I have in mind, based again on some calculated volumes, is a ported box using a slot port (not sure what the best term is here, I don't want a tube type port, but rather use the box walls plus an internal wall ending in a slot to the front of the box baffle). Volume is about ~.6 cu. ft, but I'm not nearly as concerned about this right now as driver selection and xover design.
If this post itself needs rework or I missed anything (or I need to do more homework, et cetera) please let me know, I'm pretty excited about this project.
The particulars of this design;
I'm wanting a 2-way system using a pair of drivers to control costs and keep it a little more simple (first timer and all). The design goal is to act as the only drivers for computer / small room use without the aid of a separate subwoofer. For power I've got an older Sony that is rated at 75 watts per channel to the mains. I'd like a smaller sized enclosure as I don't have tons of space. And to make this even more complicated, I'd like to use some Morel MDT-20's I already have from a previous project idea that never happened so they're sitting new in box. I know that's not the way to start a project but my hope is that this design restriction doesn't pose much of a problem.
To start, here's a link to the MDT-20 on Parts Express for those not familiar and want to check out the graphs and other specs;
Morel MDT-20
The driver I've been looking at to match with this tweet for this project is the Dayton RS180S-8. It seems like a good compromise and can reach up to near the MDT-20 without breaking up too badly. But that's what my eyes on the graph tell me; what do those with more experience think?
Dayton Audio RS180S-8
I'm not married to this driver by any means, although I do really like the shielding (even if it's not the best shielding ever, for this application I appreciate it) and the price of $35 each is good. I'm open to suggestions, for sure.
What I've come to on my xover is a want for steep roll off to keep these drivers from breaking up, while trying to get as much useful range out of them as possible. To that end, I configured a 24db/octave Linkwitz Riley as they seem fairly straightforward and don't carry with them an overly large number of required components. I figured on having the rolloff for the woofer start at 1700Hz and the tweet should come in at 2300Hz. I figured if the power is a little weak in that notch, I'm still in better shape than having the drivers overlap too strongly with a resultant peak. Thoughts?
The crossover layout as drawn up is here;
To keep this from getting too long as a thread starting post I'll skip my selected xover component values, although I've gone through with a couple online calculators and tried to work out some values. I then went through the Parts Express online catalog of Jantzen components and, using their 18 ga. air core inductors and their line of CrossCap capacitors, found the nearest available commercial values. I think it best to go that route instead of making approximated equal values to the computed values to keep thinks more simple for both construction and signal path.
The box I have in mind, based again on some calculated volumes, is a ported box using a slot port (not sure what the best term is here, I don't want a tube type port, but rather use the box walls plus an internal wall ending in a slot to the front of the box baffle). Volume is about ~.6 cu. ft, but I'm not nearly as concerned about this right now as driver selection and xover design.
If this post itself needs rework or I missed anything (or I need to do more homework, et cetera) please let me know, I'm pretty excited about this project.
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