Mini-Monitor Project Going On

[gary f]

Hi, I am now building a small mini-monitor of the highest quality possible. I build it for myself so it is almost a "cost is no object" project.

It is inspired in parts by the small sonus faber monitor and by the Hatt-SE by Tony Gee: HATT-SE at Humble Homemade Hi-fi

The idea is making a small 2 way speaker using the Seas W12CY woofer and a Scan-Speak 9300 tweeter. The cabinet will be a kind of round shape with multi layer of wood laminated with some Lead sheets in between for added mass.

Phase 1 is now completes, I have build the frame of the cabinets.
The shape is quite easy to build.

[gary f]

As you can see, I have cut a flower shaped hole in the front pannel for good air circulation. There will be a nice front baffle to cover that later.

[cowanrg]

looking good. your link is bad, but here is the fixed one:

http://home.hetnet.nl/~geenius/

[gary f]

This is a mess!!

I started to glue the wood sheets on the frame using epoxy glue. This is long and messy. This project is gonna be long...

I will put maybe 5 layers with a thin (2mm) lead sheet somewhere in the structure.

[gary f]

thank you for the link!

The cabinet will be approx 4.5 litres volume and the f3 can go as low as 55 hz approx. The reflex port will be under the cabinet.
See this tread:
Reflex port under the cabinet ??

I will design the filter later when the cabinet will be finished. I am thinking about a 2nd order (electrical) with a LC filter on the woofer at approx 2250-2500Hz.
Should I go higher or lower with the X-over point??

F

[rwagter]

Whouw,

do we share the same brain ?!



mine is build up bij separate cnc'd ribs but due to lousy cnc I'm stuck for now.

Will you use the same filter as tony?
Ralph

[The Paulinator]

I don't know if this is important enough to worry about at this stage of the project or not, but you might think about carrying that nice rounded effect all the way up to get rid of those corners at the sides of the drivers, that way if you flush mount the divers you will have practically no chance of edge diffraction on the speaker anywhere. And in my opinion when you build cost-no-object speakers for yourself, you can take whatever measures necessary to get rid of just about every known speaker plague.

But at the same time, if it is too late in the construction phase to factor that in, I know they will sound awesome with that drver selection you have going on.

And I would personally recommend you crossover at 2500 or even higher with that quality woofer. Don't give your tweeter too much to worry about.

[gary f]

but you might think about carrying that nice rounded effect all the way up to get rid of those corners at the sides of the drivers, that way if you flush mount the divers you will have practically no chance of edge diffraction on the speaker anywhere.

Sure I will, this is the plan, the front baffle will be round with no edges.

mine is build up bij separate cnc'd ribs but due to lousy cnc I'm stuck for now.

Cutting the layers is not so long. In 2-3 hours with a jig saw, you can cut them yourself. But there will be a lot of sanding.

I will try using Tony Gee serie filter, but the tweter is not the same and the cabinet is not the same shape. I will also try my own filter.
I have access to high quality spectrum analysers and calsod so I will design a good one later.
F

[gary f]

Hi

I work on this VERY slowly

I have now laminated 2 layers of wood and started to glue the lead. Beware, i'ts toxic!

This is going OK with not so much problems but it's long and messy. The enclosure is becoming heavier and stiffer. Good!

F

[Timn8ter]

Keep going Gary! Thanks for the updates. The payoff is coming.