RS180 MTM Build in Oak - Pics

[Pete Schumacher]

Re: RS180 MTM Build in Oak - Pics

I've been wanting to do a cabinet with edges like you did with the quarter rounds. I've seen this sort of treatment done on various pieces of furniture and could never figure out how it's done.

That's what I did for the tower 3-ways I gave to my mom for Christmas.

It's really simple Paul, and very clean when finished.

[Soundslike]

Re: RS180 MTM Build in Oak - Pics

Here's the graphic pertaining to inductor placement -- doesn't directly address your situation though..

[mike price]

Re: RS180 MTM Build in Oak - Pics

The way I did my quarter rounds , I attached the cleats to the sides top and bottom leaving 1/4" for my front panel to set in , then when I glued the front panel in I left it sticking out 1/2" , which left me with the proper space to glue my quarter round in. To get the spacing just right , I used a scrap piece of my baffle material , and a scrap piece of my quarter round as a guide to how far back that front cleat needed to be set ( be sure it's from the same stick you intend to use because I've found this stuff to vary significantly in size). It takes a little time but I like the end result , and the cabinets are rock solid.

[mike price]

Re: RS180 MTM Build in Oak - Pics

Here's the graphic pertaining to inductor placement -- doesn't directly address your situation though..

Thank you for this graphic , it is the one I had seen a while back but didn't remember where. I'll be sure to keep those two air cores 20cm apart then , and it should be fine

[ThetaOne]

Re: RS180 MTM Build in Oak - Pics

Thank you Tom. They are covered , the pics just don't show it very well , I used the Bandit iron on edge veneer before assembling the panels. It isn't the best method , I know , but my skills aren't quite up to mitering the corners yet so it will have to suffice for now.

I often use a router to miter the edges. Depending on your table saw setup it can be quite sketchy mitering :eek:

[donradick]

Re: RS180 MTM Build in Oak - Pics

My white oak baffles on my Mini-Statement build. Home Depot 3/4 white oak face plywood, 3/4 inch oak quarter rounds.



detail look at edges:


my supervisor checking out my work:



The whole speaker -


Once they were finished, I was not real pleased with the oak baffle on black box look. My preference is usually the opposite - dark baffles on lighter wood grain boxes.

[mike price]

Re: RS180 MTM Build in Oak - Pics

My white oak baffles on my Mini-Statement build. Home Depot 3/4 white oak face plywood, 3/4 inch oak quarter rounds.



detail look at edges:


my supervisor checking out my work:



The whole speaker -


Once they were finished, I was not real pleased with the oak baffle on black box look. My preference is usually the opposite - dark baffles on lighter wood grain boxes.

The baffles look , great , in fact I believe they may outclass the rest of the cabinet a bit. The only thing I painted black on these is the backs and bottoms , which will rarely be seen. Ive done some econowaves that were black with stained baffles and they didn't look too bad that way.

[czag]

Re: RS180 MTM Build in Oak - Pics

Maybe someone can help me out here , I got the two small coils I was missing in today , and am about ready to build my crossover , I know there are some do's and don'ts regarding inductor placement and crossover layout in general , this is what I've got in mind as a starting point for a layout , please point out any placement issues.

I would seriously consider putting a zobel on that tweeter. When I modeled it with Jeff's xover the 28F's rising response puts it around +3db from 9khz on up. I tried a zobel with a 2.5uf cap and 1ohm resistor and that got it right back to Jeff's graph except for the 28F's natural 2.5db rise from 17khz on up.

Chris

[Jeff B.]

Re: RS180 MTM Build in Oak - Pics

I would seriously consider putting a zobel on that tweeter. When I modeled it with Jeff's xover the 28F's rising response puts it around +3db from 9khz on up. I tried a zobel with a 2.5uf cap and 1ohm resistor and that got it right back to Jeff's graph except for the 28F's natural 2.5db rise from 17khz on up.

Chris

Remember, my crossover was for the RS28a. The top ocatve response is different between these two tweeters.

[donradick]

Re: RS180 MTM Build in Oak - Pics

The baffles look , great , in fact I believe they may outclass the rest of the cabinet a bit. The only thing I painted black on these is the backs and bottoms , which will rarely be seen. Ive done some econowaves that were black with stained baffles and they didn't look too bad that way.

Thanks Mike - without a working table saw I figured all I could make was baffles, so I modified old Boston Acoustics towers for the build.

[[email protected]]

Re: RS180 MTM Build in Oak - Pics

Those baffles are beautiful. I've got two coats of thinned poly on the cabinets right now , and will probably put one more coat of thinned before I start with the full strength stuff. I have found in the past it get gets less bubbles in it that way. When you say a paste wax , do you mean like an automotive wax? or something specifically designed for woodworking? Forgive me for what may seem like dumb questions , but I have very little experience in woodworking.

johnsons paste wax is what i use, but there are other brands at woodworking supply houses.
i use a grey pad on the random orbit sander to get rid of any glossy spots. put some wax in the toe of a sock. a childs sock works great. the wax will melt through the sock so no chunks. then the white pad for buffing.

[mike price]

Re: RS180 MTM Build in Oak - Pics

I would seriously consider putting a zobel on that tweeter. When I modeled it with Jeff's xover the 28F's rising response puts it around +3db from 9khz on up. I tried a zobel with a 2.5uf cap and 1ohm resistor and that got it right back to Jeff's graph except for the 28F's natural 2.5db rise from 17khz on up.

Chris

I am aware the crossover may need some minor alterations to work properly with the RS28-F. When I get the speakers assembled , which should be today , I will take measurements and post the results. Adjustments should be minor , and I will certainly be seeking advice on how to deal with them.

EDIT: If you still happen to have those models with and without the zobel , would you mind posting them? I havent figured out how to use PCD as of yet , I actually just got Excel installed on my PC , and when I loaded up PCD it freezes up when I try to scroll the page up and down. Not sure if I need an update for Excel or what.......

[mike price]

Re: RS180 MTM Build in Oak - Pics

johnsons paste wax is what i use, but there are other brands at woodworking supply houses.
i use a grey pad on the random orbit sander to get rid of any glossy spots. put some wax in the toe of a sock. a childs sock works great. the wax will melt through the sock so no chunks. then the white pad for buffing.

I've actually got some of that Johnsons wax in the shop. I figured out what you were talking about after googling wood wax. I've got 4 coats of poly on the cabinets now , and I'm stopping there. In a week or two I will buff them out with the Johnsons paste wax. I don't want to go any further with the poly because it's already pretty thick , and I don't want it to get that "plastic" look.

[czag]

Re: RS180 MTM Build in Oak - Pics

Remember, my crossover was for the RS28a. The top ocatve response is different between these two tweeters.

Sorry, that was my point. These are two different tweeters and although the xover works great with the 28A it might need the zobel to get it to play nice with the 28F because of the difference in top end response. I should have been more clear.

Chris

[donradick]

Re: RS180 MTM Build in Oak - Pics

I am aware the crossover may need some minor alterations to work properly with the RS28-F. When I get the speakers assembled , which should be today , I will take measurements and post the results. Adjustments should be minor , and I will certainly be seeking advice on how to deal with them.

EDIT: If you still happen to have those models with and without the zobel , would you mind posting them? I havent figured out how to use PCD as of yet , I actually just got Excel installed on my PC , and when I loaded up PCD it freezes up when I try to scroll the page up and down. Not sure if I need an update for Excel or what.......

Make sure you have the "analysis" add in loaded in Excel for PCD. If you are using Response Modeler (strongly suggested for baffle difraction modeling), you will need the fft.dll included in the RM package. Since you have a working measurement setup, that will be very useful for overall frequency balance, but PCD is invaluable for phase matching through the crossover region.