Phoenix Gold Phorum

finally.. all the calculations were done.
all the doubts were gone.
LET'S BUILD IT!! the best audiophile home-sub?...
driver; peerless 830845 [XXLS 12] talk about x-max...with a FS of 21.5 hz.
designed for a closed cabinet of 62 litres.
will be driven by a hypex ds 4.0 amp.
front and rear; 44mm. thick mdf.
sides; 22mm thick mdf, will have a 20mm. thick marble layer glued to them [this will become the top- and bottom, since it wil be laying on it's side]. This sub will survive an earthquake.
weight will be well over 90kg.
more pics to come, it's far from finished...
nico

thats crazy (in a good way) !!!

Just as a suggestion, I think you should round off all the edges of each circle. Some of your braces really don’t have enough holes in them, and you could end up with internal airflow patterns which “chuff” and color the sound.

You would be better off building square or plus shaped braces which don’t restrict flow. Yet another great way to brace is to simply apply strips to the sides of the major sized panels.

Bracing is an often overlooked and useful measure, but if overdone, you could be worse off then without anything, depending on the situation.

Oyyy... now THAT's a box!

nico boom wrote:This sub will survive an earthquake.

With the marble covering, could always put it in the kitchen and lets GF or the Mrs. cut stuff on it, then turn on the sub and micro blend away..............or you could put it in the garage as a hell of an engine stand.

Your right, that thing could survive an earthquake!

nice

wow, now thats time. but i agree with doc, i think you could have just done some regular frame style braces and would have less restriction
on the air.

either way that box is crazy

you guys really see it all, don't you..
THANKS FOR THE COMMENTS, fraised the edges of the holes this morning,[like I planned to],they are almost completely rounded off at both sides, which gives them the final diametres. indeed without fraising, they would have been too small, and too rough at the edges!
bracing as suggested by some of you is indeed enough, but TOO EASY.
I like building things, and get easily bored when it's done, so I like to take the long way....
the marble comes from a friend of mine; he's already made several beautiful things for my speaker systems.It adds enormous weight, smooth finish, and yes, my wife can put things on it then...
I've just tested every part again for exact fitting, next step is numbering them in the right sequence for putting them all together.
building things like these,is why I also like car-audio so much; there's always someting to be done!!! nico
pic; this guy is gonna have to WORK HARD. [notice the looong voice-coil].

Wow, now that's impressive

work from today.
Fraised extra holes in the large panels for even better airflow, now it's absolute above the required area.
Interior screwed and glued together, tomorrow rest of the panels, then fraising the edges all round, to match my floorstanding speakers.
enough for today!
nico

Man, that is a rigid box.

vin78 wrote:Man, that is a rigid box.

You know, there are some women that fit that description

Earthquake, tornado? Take the sub out and climb in. Looks sweet. Time is most often overlooked when doing installs/projects of this caliber.

AND NOW; lady's and gentlemen; THE FIRST TEST..
Got time enough to assemble it, not glueing the back, since I want to measure first, if the result is OK, considering adding/ removing dampening, which will be impossible when the back is glued.
First impression; it's as dead as lead, Very tight bass, and goes down to 22 hz with a astonishing authority.[with the appropiate bass-boost engaged]. Luckily this woofer can handle an extreme excusion with ease, so even at very low freq.; the x-max is not destroying the unit.
I've had some subwoofers in the past, but this is the first down-to-the-liter-calculated CLOSED cabinet, and it sure makes a difference ,compared to bassreflex- or transmissionline ones.
I'll change nothing yet, first I'll listen to it for a week or so. If by then there are no doubts about having to make changes, I'll glue the rear panel, and start with finishing. For that purpose I fraised a mdf cover to temporarely replace the driver.
So far a really nice project! let's see if after the clouds of mdf-dust, my neighbours still agree that statement with me ,while I'm testing it's [and their] limits...
nico

awsome is the enclosure full of dacron?

Wow, those speaker towers look really awesome too. Did you make them?

thanks.
yes; the enclosure is full of BAF. it's a kind of dacron, with precise specified parametres, which makes it possible to calculate exaclty the right amount for a given enclosure with a simulation-program.
For this, I go to my friend Titus, who ownes a SPEAKER-EN-CO store.
He knows more about everything to do with speakers, enclosures, filters etc., etc.,then I will EVER know....
First , we empty his coffee-machine, eat all his biscuits,and then after brainstorming, mostly something beautiful comes to life.
The speakers you see, are build by me, and they are a exclusive design by...Titus himself again.
This was a redicilous cheap-to-build design, that to this day surprises me, and many friends who hear it. The piece of marble is from one of my other mates [am I a lucky bastard or what!]Got-to-go; dust the livingroom....before the neighbours go to bed!