speakerstuff

DONE!  Crossovers, dampening and drivers installed, sounds amazing!

Listening impressions: I’m afraid I can’t really give these speakers a fair audition.  Not only am I novice with this, I also have an absolute horrible room for acoustics: laminate flooring and the couch is on the back wall.  Building these sealed, I have to augment them with a sub, so bass from my Dayton Reference 12″ is boomy (extension is impressive, but this room is making it boomy).  As for the flooring, I have a rug, but it’s not positioned to catch that first reflection point.  For the side wall first reflections, I have another couch (good) and a stone fireplace (bad).  I’m planning on treating the wall behind the speakers, behind the couch, and building a couple of bass traps, but right now the room is really hurting things.  In addition, the speakers are not positioned as wide as I’d like, so the sound stage feels kinda narrow.

All that considered, these things still sound awesome.  They feel very balanced and accurate.  I’m hearing things in music I didn’t know were there.  It gives me a whole new appreciation for the music I’m listening to.  I find myself saying, “Ohhh, that’s what it’s supposed to sound like, that sounds good!”  The tweeters are so smooth and don’t offend me at all, even with crappy recordings with no dynamic range.  I’m not a fan of metal tweeters (I probably haven’t heard any good ones), so these tweeters are welcome here.  The RS150s seem to blend well with the 27TDFCs.  CJD, whatever you did to design this crossover, I AM SOLD.  Midbass is tight and punchy and transitions well with the sub.  Well I’ll say it SHOULD transition well once I get my sub from sounding like I’m underwater and a whale is talking.  I was really worried about the low speaker height until I heard them and I can now comfortably say it’s a non-issue.  Anyway, as a novice audiophile that’s the best way I can explain what I’m hearing.

Now for some speaker porn…

I know I owe you guys some sexy pics but this will have to do for now.  I’m just waiting for some parts that will be here on Friday, and I should be done this weekend, woohoo!

I finished up the center channel which will be hidden in the entertainment center behind grill cloth.  Here’s some snaps of the partial BSC crossovers for the RS150s and the 27TDFC.  They’re on MDF, 16 gauge wire between components mounted with hot glue.

The crossovers are mounted with velcro connected with 12 gauge speaker wire (monoprice).  The box has the dampening on the walls with a little bit of acoutica-stuff/polyfill/whatever it’s called in the enclosure.

I’m still waiting on the inductors for the RS150 crossovers for the mains, but I went ahead and put everything together.  Both the front and rear baffles are floated with screws through oversized holes and washers to allow for expansion.  Here’s a pic of the gasket before attaching the rear baffle.

The stands were finished separately: primer, black paint, polycrylic for the MDF and sealer with polycrylic for the BB ply.  After finishing, the pieces in the center of the stand were glued together with wood glue to make one piece.  It was then attached to the bottom and top pieces using screws.  I didn’t want to use any glue on that part in case I wish to make the stands taller later on.  The stands are attached to the speaker with 1/4″ socket cap screws threaded through the hurricane nuts already in the bottom of the speaker (see previous posts), with rubber grommets to create a small gap.  Rubber feet on the bottom of the stands for the wooden floors.

The front baffle is attached with wood screws that are screwed in from the rear by reaching my hand through the driver cutouts.

As for the rear baffle, I would have done the same as the front baffle if I could do this over.  Instead, I used socket cap screws visible from the back, but they weren’t very nice to the surrounding paint.  One of the bolts has a large standoff that I was planning to use to anchor the speakers to the wall or the entertainment center.  Now I’m not confident I’ll even use them, so that was a mistake.

Here they are in room.  They’ll be a little farther apart than this when all is done.

And here’s with the pull-down projector screen.  The center channel is behind all that grill cloth in the entertainment center.

With all this work I’ve decided to ditch the Tritrix and upgrade to the MTM.  Considering the time and money already spent, the cost difference is pretty minimal.  The enclosure and baffle are identical.

Progress has been slow but steady as the weather hasn’t been great for working in the garage.  Here I drilled some holes for dowels using a drill press and template.

For the bottoms, I drilled holes all the way through and used hurricane nuts so I can use these later to bolt the box to the stand.

And the next layer from the bottom is the brace, so the holes will be covered…

It’s been so cold outside I had to bring everything inside for gluing.  I did two layers at a time and clamped.  I tried three at a time but I couldn’t get enough clamp pressure to close everything.  Two layers was just fine with about 30 minutes clamp pressure.  The dowels help a lot with gluing.  Despite using a drill press and template to make holes for the dowels, it still wasn’t perfectly aligned.

Here are both enclosures glued with one sanded.  For sanding I started with 100 grit because it was the roughest I had on hand.  After 20 minutes of little progress and an arm that was about to fall off, I ran to the store and got some 60 grit which went MUCH faster.  The finished off with some 220 grit.  I applied one coat of Zinsser sanding sealer (sealcoat) on the inside before applying the acoustic foam.

This is the 3/4″ Parts Express sonic barrier.  Feels stiff and heavy duty, I like it!

I dumped the sawdust from the sander and mixed it with PVA glue to fill the voids.

That’s it for now!