...Afterall, most of my speakers are made of flimsy foam core. When needed, I add a layer of latex caulk and another layer foam core for constrained layer damping (CKd) and they actually sound very good (and measure well too).
Look at this speaker for example - all 3/16in Dollar Store foam core with double layer face on front with cardboard and caulking for CLD.
http://www.diyaudio.com/forums/multi-way/281778-low-cost-pmc-inspired-tl-monitor-dc130a-dc28f.html
That is really cool, and very clever. Have you ever made an exterior wooden box to go around your foam core cab, for added mass and better looks? That would stiffen up the walls, and maybe the glue between the foam core walls and the exterior wood walls would act as a sort of constrained layer as well.
I can see how this foam core construction method would be a great way for non-woodworkers to learn how to put cabinets together. Get your chops together fitting the foam core cabs, and progress to making sawdust when you're confident about it.
Thanks for that!
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If you want more foam core projects look here in post 1 is an index:
http://www.diyaudio.com/forums/full-range/223313-foam-core-board-speaker-enclosures.html
Yes, no sawdust. No power tools. Kitchen table projects.
http://www.diyaudio.com/forums/full-range/223313-foam-core-board-speaker-enclosures.html
Yes, no sawdust. No power tools. Kitchen table projects.
I can't believe I already received my tweeters and woofers today in the mail. Gr-research is really fast!
Wow, these crossovers are huge!
Also the speakers might fit in my existing infinity rs2001 enclosures -- I'll have to check. If they do, is it okay to use them temporarily? They might have a bit less volume than what was recommended. Plus there is no port.. sealed.
Tempted to make some temporary enclosure with criss-crossed cardboard or foam board & hot glue
Criss-crossed cardboard would be much more rigid. Say 3 layers.
Wow, these crossovers are huge!
Also the speakers might fit in my existing infinity rs2001 enclosures -- I'll have to check. If they do, is it okay to use them temporarily? They might have a bit less volume than what was recommended. Plus there is no port.. sealed.
Tempted to make some temporary enclosure with criss-crossed cardboard or foam board & hot glue
Criss-crossed cardboard would be much more rigid. Say 3 layers.Hi Jennifer G,
Check dimensions and mechanical drawings for screw locations for the drivers in the GR-Research kit - it is likely to be different vs what you have in the RS2001.
The front baffle width and box tuning (cabinet volume, port length) are integral parts of the design.
Getting a well designed kit and putting it into a sub-optimal box - not a good idea.
Check dimensions and mechanical drawings for screw locations for the drivers in the GR-Research kit - it is likely to be different vs what you have in the RS2001.
The front baffle width and box tuning (cabinet volume, port length) are integral parts of the design.
Getting a well designed kit and putting it into a sub-optimal box - not a good idea.
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Noted.
Everything look okay ? :
Everything look okay ? :
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Lookin' good from here.
Time to make some sawdust?
I wish, the speaker cabinets won't be here for like a week. Parts express is much slower than gr research evidently
Unless I want to make temporary enclosure with cardboard or foamboard.Jasper jig: Jasper 200J Model 200 Circle Cutting Jig for Plunge Router - - Amazon.com
There's a 400J model also, but model listed above can cut bigger circular holes (might come in handy).
The jig makes cutting circles (including countersunk driver ones) easy.
There's a 400J model also, but model listed above can cut bigger circular holes (might come in handy).
The jig makes cutting circles (including countersunk driver ones) easy.
Looking real good. I told you those XO's were impressive - a lot of copper there.
In would wait for the boxes to arrive. If it happens to fit your current boxes perfectly then no harm in listening. Even sealed will have some nice bass to say 80Hz I would guess.
Not that I know of. Appears to be basic second order LR. We could ask Jennifer G to flip PCB upside down and take photo. We have all the values from photo except inductor values. I would have to cut a window in my speaker to get at the XO board to measure the inductors with my DATS. If someone else has done so already they could post the measurement.
I have the classic which has same inductors but different caps and resistors.
I have the classic which has same inductors but different caps and resistors.
I might try and make a circle jig for the cheap $20 handheld router from harbor freight -- since we already own that one. Using OpenSCAD and 3D printer. I have a 3D printer so why not try and make use of it right? If I do succeed I'll share the jig 3d file on Thingiverse. (free).
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Got the parts-express MDF speaker cabinets today in the mail. Quick shipment.
Turned out to be only one speaker not two. I was expecting two for the $40.
I am pissed and want my money back. No way in heck would I pay $80 for a few pieces of cut MDF.
EDIT: I went back to the web page and realize I guess it's just for one. I think they should of put a note in there and said "THIS IS JUST FOR ONE SPEAKER" so I would of caught that. I would of never paid $80 for them though. I can buy a 4x8 foot sheet of 3/4 MDF for $25 and that'd be enough to make much more than two speakers. The price threw me off I think.. If they had been priced appropriately..like $25 to 30 I might of caught on it was only for one.
Turned out to be only one speaker not two. I was expecting two for the $40.
I am pissed and want my money back. No way in heck would I pay $80 for a few pieces of cut MDF.
EDIT: I went back to the web page and realize I guess it's just for one. I think they should of put a note in there and said "THIS IS JUST FOR ONE SPEAKER" so I would of caught that. I would of never paid $80 for them though. I can buy a 4x8 foot sheet of 3/4 MDF for $25 and that'd be enough to make much more than two speakers. The price threw me off I think.. If they had been priced appropriately..like $25 to 30 I might of caught on it was only for one.
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Sorry you did not catch that. To be fair - those are precision CNC'd pieces that will go together perfectly in like 1hr. How much is your time worth and dealing with breathing MDF dust. If you cut your own I would spend a bit more and get the sheet of 3/4in birch plywood at HD or Lowes.
Keeping one as a pattern for making a second one is not a bad idea. You could even make the second one out of plywood if you wanted.
Certainly building one up will get you to first sound faster than starting from scratch.
Keeping one as a pattern for making a second one is not a bad idea. You could even make the second one out of plywood if you wanted.
Certainly building one up will get you to first sound faster than starting from scratch.
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Not real sure of how to work with this cabinet as the dimensions don't match the cabinet build plans GR Research suggests.
They suggest a cabinet 13.5" tall on the exterior... these are 16" tall.
I regret buying this cabinet because not only did I only get one, I could of just built them to exact dimensions. Affraid to buy another one of these for $40 because they aren't even the right dimensions. I agree they are machined well.
The height doesn't matter as long as the width is about the same and the volume is about the same. Too large a volume is not an issue as you can either add material inside or shorten the port to keep tuning frequency the same. The width affects the diffraction which is accounted for in the crossover design.
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