Porting My Fi Qs

[Chrispy 10+ year member]

The plan is to port 3 of my 4 Fi Q 15s. Only three because I want to be able to build the box outside of my car and still want room for my mids and highs which will also be in the wall. This will be my first ported setup so my question is how does 8.4ft @ 32hz with 110 inches of port area sound? I really dont want to go much bigger than that. Subs will be ran by a RF T4000 at 1.34 ohm. I'm currently running the 4 sealed in 8ft.

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[RAM_Designs 5,000+ posts]

A little small, I'm thinking 10ft^3, minimum.

 

[Spooney 10+ year member]

8.4 cubes is too small for three. I have one 15 inch Fi Q in just over 3 cubes and it sounds great but the lows aren't as loud as I expected. If I could I would have made the box 4 cubes at least just for the one. I think it would do a little better on the low lows.

 

[mlstrass 5,000+ posts]

build 2 ported boxes outside the vehicle and connect them once inside the car. around 7cubes net per box @ 32Hz with 84^2 of port area...

 

[Wildbillpb 10+ year member]

Fi Q 15" Ported box: 2.8-4 cuft @ 28-33Hz so he is running the minimum for 3. I'd give them more space if you can afford to, they will sound a lot better

 

[PrestigeSounds 10+ year member]

agreed^^ make the box bigger and if you dont have enough room, you may want to change from 3 to 2...just a suggestion...

 

[Chrispy 10+ year member]

How would the three ported in 8.4ft sound compared to 8ft sealed? What about a couple Xcon or BTLs 15s in 8.4 ft @ 32hz?

I'm thinking I would like more of an SPL sub. BTW I'll be running all pro audio mids/highs with this setup.

 

[mlstrass 5,000+ posts]

what car do you have? Those subs would do well in around 14cubes net and you should have room for that and your PA stuff in the trim panels unless you have a tiny *** car.

 

[Chrispy 10+ year member]

Cadillac Seville but I want to be able to build the box out of the car and a little over 11cuft is as big as I want to go. I came up with a design of 8.4cuft @ 32hz. I'm really starting to consider two BTL 15s if they're be louder in that box than 2 or 3 Qs would. Pretty sure the BTLs would be alot louder and make up for maybe not sounding as clean as the Qs.