Started budget bookshelf crossovers today.

[johnnyrichards]

Right now, they are not soldered and the large coil is the wrong one, still waiting for my delivery from Erse.


I may stand one of the two air cores up on it's side just because, even though rationally I know that problems will be minimal, if any.

Drivers are the Dahlquist 5.5" woofer and the Atlantic Technologies 1" Dome tweeter with oval faceplate.

[johnnyrichards]

Re: Started budget bookshelf crossovers today.

Modeled FR and phase, 6 degrees off axis in the vertical and 8.5 degrees off axis in the horizontal at a listening distance of 0.75 meters. This is where I spend most of my time when listening to music at my PC.

[evilskillit]

Re: Started budget bookshelf crossovers today.

Lookin good. Looks like my first crossover, but you know... good. ;) My first time around I did through hole on plexiglass. Was pretty neat. Yours looks much nicer and cleaner tho.

[johnnyrichards]

Re: Started budget bookshelf crossovers today.

We'll see how nice they end up after the soldering iron + my shaky hand + clear plastic all meet

Thank you for the kind words.

[evilskillit]

Re: Started budget bookshelf crossovers today.

We'll see how nice they end up after the soldering iron + my shaky hand + clear plastic all meet

Thank you for the kind words.

I can tell you from experience, it gets smelly at that point. Not as bad as cutting it with a saw, but still stinky, heh.

[johnnyrichards]

Re: Started budget bookshelf crossovers today.

Well, I only melted one little spot on the Plexiglas, and they ain't so pretty as they were with no solder, wires or glue but I got it done.
Bottom view:

Top view:

[evilskillit]

Re: Started budget bookshelf crossovers today.

Looks good to me man. I tried to make my most recent crossover boards pretty. I kind of did but I'm a functional guy, eventually I just gave up and laid em out in a functional manner on pegboard and did point to point wiring on top of the pegboard. I guess when it comes to function they're a thing of beauty. Heh

[johnnyrichards]

Re: Started budget bookshelf crossovers today.

These will officially be named "Datum".

Dahlquist blue 5.5" buyout woofer
Atlantic Technology 1" buyout tweeter
X-over point ~2700
Sealed
0.3 cubic feet

They will be replacing my Speakercraft based project from last year.

Start construction Friday afternoon if all goes well.

[johnnyrichards]

Re: Started budget bookshelf crossovers today.

Thought I would post some pics of the drivers, since PE doesn't do them justice on their site
Front view of the Dahlquist woofer:


Rear view of the woofer:


The tweeter:


I brought the tweeter to work and put it on the stone to measure the radius of the left and right sides. It is ~53 mm. The thickness is 4 mm. Overall dimensions are 70mm x 54 mm. The four corners are radiused at ~ 8 mm or so.

I'll crack out the router hopefully even this weekend and do some preliminary cuts to double check.

[johnnyrichards]

Re: Started budget bookshelf crossovers today.

Started cutting today. My first attempt at flush mounting odd shaped drivers.
View from the front:

Side view:

Side view with more angle:


Sawdust covering everything. Have to do a good cleaning before I mount anything

[johnnyrichards]

Re: Started budget bookshelf crossovers today.

Those little Atlantic Technology tweeters are nice BTW

[johnnyrichards]

Re: Started budget bookshelf crossovers today.

Mock up including dowel braces:

Internal roundover of woofer cutout:

Glued and clamped!


I am thinking of a preliminary listen as early as tomorrow.

[johnnyrichards]

Re: Started budget bookshelf crossovers today.

Both cabinets assembled and waiting slightly warmer weather to give them a coat of primer so I can start sanding and find the high/low spots:

[johnnyrichards]

Re: Started budget bookshelf crossovers today.

First layer of filler along seams and nail holes. Sand, then re-apply if necessary otherwise it is off to the glazing putty stage:


Still pondering finish, although I am leaning towards either all satin black or a satin black/green two-tone job.

[johnnyrichards]

Re: Started budget bookshelf crossovers today.

OK, Boulevard Unfiltered Wheat #3 and the glaze putty is on. Tomorrow night - sand and primer :D