Check out what I just won on ebay.. DIY Sub Here I come! (1 Viewer)

[Pete Mazz]

The X-Max of this driver isn't that large (9.5mm) and Brian
said in either ported or sealed @ roughly 70Hz I will in fact
push the driver past it's X-Max.

You must have misunderstood. Excursion rises as freq drops, if sealed, and if vented, excursion rises above and below tuning.

Pete

 

[Brian Bunge]

Pete is correct. You hit Xmax at 70Hz and the lower you go the higher the excursion will go. I saved your driver in Unibox so I was able to go back and check excursion. At 40Hz at the rated 500W excursion will be 23mm. Even at only 250W excursion will be 16mm. Also, is the amp rated to handle a 2 ohm load? I predict it's only a matter of time...

 

[Brett DiMichele]

Brian,

I don't know if it's rated to handle 2Ohm I am not keeping
it at that load I was just testing it, though I did ask AR
in the email what the stability figures are (if they ever
get back to me it would be nice) I would just email Carver
if they posted an email address..

Was that 23mm Excursion at 40Hz in the sealed 50 or so
Liter enclosure? If so, I am most definatly going to be
sending chunks of speaker out to you....

What software are you using to figure this out? I am
using WinISD Pro and it doesn't give me all of that info.
I would like to download whatever program you use and try
that out for the next sub enclosure and try some different
driver specs out.

Thanks!

 

[Brett DiMichele]

Brian,

Nevermind.. I aparently can't read too good... Unibox!
Hey when I am on Midnight shift my brain is fried!

 

[ColinM]

I ran into trouble quickly with the sealed 10" Titanic rather quickly in the deep regions - - It was fantastic with loud rock, but movies absolutely overworked it.

Nothing a 12" couldn't cure...

I wish you luck and hope it comes out good!

 

[Michael R Price]

"Nothing a 12" couldn't cure."

Or a 15, or 18. Or multiple drivers. Crazy, eh?

Seriously Brett, I think you should try the AV15, you'll need a bit larger box but it will take advantage of the power quite well.

 

[Brett DiMichele]

I guess this would all be quite easy if I did just go with
a Titanic 12 or AV 12 or HE12 or any of the same in 15"
with a much larger ported or sealed box.

But I don't want a big box.

What 10's are out there that can handle 500 watts rms and
work in a small enclosure? I just checked the specs of the
Titanic MKII 10" and it really isn't going to do any better
than the MB-Q 10... It has more excursion but it still
doesn't handle the power that the larger drivers do.

Who makes the driver that carver uses in his small cube
subs? I mean, he says he feeds 2700 watts into the 13" x 13"
Cube and gets 110+ DB all the way down into the 20's. That
must be a serious driver...

 

[Brian Bunge]

Brett,
An AV12 in the exact same enclosure that you are building for the Quart 10" would be a much better sub than what you're throwing together.
Why try to "clone" a commercial sub when you can far outgun it for a lot less money? When your goal is super small enclosures you have no choice but to throw 5-10x as much power as normally required for a more reasonably sized enclosure and use tons of EQ to get somewhat flat response.
If that's what you want then you'll need something like a Brahma 10", shitloads of power, and an LT circuit. In other words, you'll have to spend around $1K anyway. But it'll be a better option than the Carver/Sunfire.
And here I thought my 18" cube with a Tumult was on the small side!

 

[Brett DiMichele]

Brian,

an 18" cube isn't bad I guess I could live with something
that size.

So what type of enclosure are you going to use with your
tumult and what power source?

 

[Brian Bunge]

It'll be an 18" sealed enclosure with 1.5" thick MDF walls. I'll be using a Crown K2 for power and will also be using an LT circuit to flatten out response down low. Fb will be 18Hz with a Qtc=.6 and an anechoic F3 around 22Hz.

EDIT: BTW, the enclosure alone is 65 lbs. With the Tumult installed I should be looking at 115 lbs. before adding legs and a table top.

 

[Brett DiMichele]

Niiiiiice
Perhaps you should just add a door and a combination lock
and call it a safe!
That is going to be one wicked sub.. Are you going to take
lots of pics for us to drool over?

 

[Brian Bunge]

I'll take a few pictures along the way. Nothing Pat Sun or Ronnie Ferrell style though. I'm building 3 of these and have the enclosures done already. Nothing special, just 18" cubes with a hole cut out of the middle of one side panel.

 

[Dan Hine]

Brian,
No fancy finish or anything either? Say that isn't so.

 

[Brett DiMichele]

I gotta say, 18" Cubed is really what I want!
But I don't want to have to buy a Crown K1 either
It's bad enough having to run this Sunfire amp off a 220V
line (but at least it won't overtax my 120v lines any lord
knows my living room circuit can't handle any more.. It's
bad when the bass hits and your mains and receiver cause
the lights to dim..

 

[Michael R Price]

"I mean, he says he feeds 2700 watts into the 13" x 13"
Cube and gets 110+ DB all the way down into the 20's. "
He doesn't. Not without a ton of distortion, at least
Brett, if you want big performance in a small box, you want an LT or PR Tumult. I'm not sure if that would fit into your budget though given the cost of the driver, and amplifier requirements. At a lower price point I'd recommend an AV12 (small PR box, maybe a 20" cube tuned to 25Hz or something).

 

[Brian Bunge]

Dan,

A nice figured cherry similar to my A/V-1+'s.

Brett,

The K1/K2 does not need a special line. You can run them off of a normal household line.

I imagine a Tumult with dual 18" PR's would be all the sub you'd ever need. But I think you're looking at something more along the lines of a 22" cube for that.

 

[Brett DiMichele]

What would be my options in the 10" driver range with
dual PR's. Could a Titanic MKII and 2 10" PR's work?

 

[Geoff L]

Brett
My man, you definitly were right when you said to not try to figure out your thinking/thought process....
You do make for interesting reading though!
Cheers
Geoff

 

[Brian Bunge]

Brett,

In general, you want the PR's to have 2-4x the displacement as the driver itself, with 2x being the minimum. You'd have to know the specific specs on the PR in order to design the enclosure.

 

[Brett DiMichele]

Geoff,
Glad I can be of entertainment to ya
Brian,
I will look at some of the PR's out there check the specs
and plot something with them and some of the better 10"
drivers available. I don't believe that my room dictates
the need for a tumult with dual PR's I think that would be
more than I ever needed as you said (too much so)
I know I sound like a broken record but there has to be
a solution available where I can make use of something in
the 10" range that will produce more than adequate output
for my room.