Fi Audio

**Sonnie** · **01-25-09, 11:28 PM**

Here's the scenario...

Dual 18's using an LLT design in a home theater (dedicated room) of approximately 3500 cubic feet.

Approximately 120ft^3 (3400 liters) to work with for an enclosure... maximum port diameter is 8"... no length restrictions.

I want to use two 18's. They can either be combined in one enclosure or two individual enclosures.

Power will be one Behringer EP2500 bridged 4 ohm, so drivers need to be setup for a 4 ohm load.

Figure using about 1800-1900 watts max (EP2500 tested at about 1950 watts).

What 18's would you use... what size enclosure or enclosures... what tune, etc... ???

I will only consider using drivers from one of our sponsors.

**atledreier** · **01-25-09, 11:36 PM**

And you're at it again!

Told you a single 15 was too small for you!

**Sonnie** · **01-25-09, 11:54 PM**

Well...

... this is for my new HT room. No way I can have just one sub in there... you know that.

I am going to open this up to sealed recommendations as well. With 120ft^3, I could do a sealed that would almost be an IB.

**atledreier** · **01-26-09, 12:48 AM**

Why sacrifice the headroom and extension when you can slap a pipe in the box and have ultimate bliss?

**Sonnie** · **01-26-09, 12:57 AM**

Just a thought... for those that might come up with a good reason to go sealed.

**atledreier** · **01-26-09, 02:12 AM**

Good luck with that..

**Mike P.** · **01-26-09, 07:15 AM**

Quote:

Power will be one Behringer EP2500 bridged 4 ohm, so drivers need to be setup for a 4 ohm load.

Then you only have 2 choices. Fi Q18-D1 or SoundSplinter RL-p18-D4. Here is A SPL model of one of each. Input power is 900 watts for both. Porting needs to be 10 inch diameter to keep the air speed acceptable.

Name: Sonnie1.JPG
Views: 1209
Size: 82.3 KB

Name: Sonnie1.JPG
Views: 1209
Size: 82.3 KB

**looneybomber** · **01-26-09, 08:04 AM**

With that huge amount of space available, I vote for the Q18's

**Mike P.** · **01-26-09, 08:19 AM**

I do too. In a LLT application the Fi Q18 is the closest match to a Maelstrom-X.

**Sonnie** · **01-26-09, 09:44 AM**

I wish Kevin had those Maelstrom-X drivers in a single 2 ohm or dual 4. It looks like they are dual 6 ohm.

I can actually open up this area that I have available to gain another 3-400ft^3 for a total of about 500-600 cubic feet. The opening into that other space would only be about 10" x 24". Not sure if that would restrict it too much or not, but that would give me the possibility of an IB system, would it not? Of course I might want to consider 4 drivers instead of 2.

Advertisement