Discuss Need advice Mal-X 21" EP4000 build in the DIY Subwoofers forum.
As I said before I have two 15 cu ft (net) subs in my 17 x 17 foot living room. ...

**gperkins_1973** · **02-16-11, 02:37 PM**

As I said before I have two 15 cu ft (net) subs in my 17 x 17 foot living room. Dimensions are 48" high by 24" wide by 30" deep and they dont look that big I don't think. The malx is a big driver and will need at least a 20 cu ft box to make it work to its most efficency.

He could go sealed but I think he will be loosing out on alot off spl down low.

This is why the sonosub is so favourable.

cheers

Graham

**Zeitgeist** · **02-16-11, 02:47 PM**

Compared sealed vs ported - on the low end... I agree.

Large, low tuning definitely gives you A LOT more.

I was surprised.

**gperkins_1973** · **02-16-11, 02:53 PM**

Its pretty amazing what you can do with that 21" driver it really is.

2 21" malx's with an EP4000 on each sub =

**1hagop** · **02-16-11, 04:05 PM**

You guys are great you are giving me tons to think about. I already have 2 sonosubs they are 15" CSS SDX in 16" sonotubes 4 feet high. I am wondering maybe I could do 30" or 36" sonosub and 4 feet high to match the SDX's.
That would be 18.7 for the 30" and 27.3 for the 36". I have the floor space, keep encouraging me and we shall see what I decide. Also is there a volume that you all would think would be the best? Let me know and I will see if I can make it work.

Thanks again for all your support on this!!!!!

BTW 30^3ft would be 53" high. I think I could pull that off!

**vann_d** · **02-16-11, 11:53 PM**

Dude, the bigger and lower tuned on this driver the better.

I have not seen (virtually via internet) anyone build a LLT with the Mal-X 21. This would kick serious bass.

People building large sealed enclosures with this driver are blown away. Think of what a large ported sub will do for you.

**gperkins_1973** · **02-17-11, 01:29 AM**

Dito, do it you know you want to!

**1hagop** · **02-17-11, 11:39 AM**

Quote:

gperkins_1973 wrote:

Dito, do it you know you want to!

Yes I do. So I do not know anything about a ported build.
Where do I buy the ports?
Can I do more than on port, a 30^3ft build would be too long of a port could I do 2 shorter ports, or 3?
I am leaning toward a 36" sonotube 53" tall. If it is tuned to 16hz it looks like a pretty good line on winisd, but then again I do not know what I am doing in that program. Here is what I played with.

**gperkins_1973** · **02-17-11, 11:55 AM**

I wouldn't bother with a 16hz tune on that sized sub. Here's a winisd file for you.
30 cu ft
Tune - 14hz
12" round port 42.84" long
Input power 1500 watts
Port velocity - 22 m/s
1st port resonance - 158hz

You could go with a 10" round port but it raises the port velocity up to about 32 m/s and if you decided to throw more power at it over the 1500 watts it would go higher.

cheers

Graham

**Zeitgeist** · **02-17-11, 12:41 PM**

I'm going to go ahead and move this into the Ported Build projects - since it seems to be a better fit now..

**1hagop** · **02-17-11, 01:16 PM**

Quote:

gperkins_1973 wrote:

I wouldn't bother with a 16hz tune on that sized sub. Here's a winisd file for you.
30 cu ft
Tune - 14hz
12" round port 42.84" long
Input power 1500 watts
Port velocity - 22 m/s
1st port resonance - 158hz

You could go with a 10" round port but it raises the port velocity up to about 32 m/s and if you decided to throw more power at it over the 1500 watts it would go higher.

cheers

Graham

Okay so I likes what I sees!

What do I do about the port. 12" PVC??? Do I center the port on the opposite side of the sonotube as the speaker or same side offset? I have never built a ported sub. Does the port tube stay straight or do I put a 90 in it.... I do not know
Thanks!