FI Q 15 sealed box size?

[AndrewHD 10+ year member]

Hello everyone, I just picked up a FI Q 15 with high QTS option and wondering what the best size sealed box would be? The website says 2.0-2.6 cu.ft. so I'm guessing on the larger side. What If I were to build a 2.0 cu ft box would it not sound good?

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[Jeffdachef 5,000+ posts]

its mainly power handling, you can throw more power on a smaller box. Just cram some polyfill in there and you'd be fine with the 2500 bd cp on it. Make it 2.5 cubic feet man, 2 cubes tiny for a 15. Make sure you have bracing and account for subwoofer/bracing displacement too.

 

[AndrewHD 10+ year member]

Its D2 and I will be running it at 4 ohms so 2.5 it is. Was just wondering if a smaller box with High QTS would sound decent

 

[Jeffdachef 5,000+ posts]

It would work but you'll miss out on some lower notes. With the FI Qs man, i had a Q15 before, you'd want to wire it down to 1 ohm with that bdcp. **** thing can take power! Mines was in a ported box too.

 

[AndrewHD 10+ year member]

I may try running it at 1 ohm but I had a Q before on 1000 watts only and they sound great. I only have one battery up front so I'm trying to make it as efficient as possible running it at 4 ohms

 

[blazian87 10+ year member]

I may try running it at 1 ohm but I had a Q before on 1000 watts only and they sound great. I only have one battery up front so I'm trying to make it as efficient as possible running it at 4 ohms

I believe that's the old Q.. but the new Q is pretty power hungry because it's been beefed up.. that's why its rated at 1500.. go with the larger box.. trust.. you won't regret it... I have a 12" Fi Q ported and it barely gets going at 1000w.. Go with 1 ohm for sure

 

[AndrewHD 10+ year member]

Ok thanks for the replies guys, I have the 2500 bdcp it puts out at least 1500w at 4ohms. The birth sheet is showing just over 2,000w at 14 volts. Should I still wire to 1 ohm?

 

[Jeffdachef 5,000+ posts]

Wire to 1 ohm and be conservative with your gain settings. Use the dmm method since that amp puts out proper power.

 

[LosIsATool 5,000+ posts]

Ok thanks for the replies guys, I have the 2500 bdcp it puts out at least 1500w at 4ohms. The birth sheet is showing just over 2,000w at 14 volts. Should I still wire to 1 ohm?

You are not powering the amp on a test bench or running a resistor, or playing it as high as they do to get that misleading number. It will do rated 1500 daily

 

[bridan222]

Hey man. Glad I found this forum...tell me u still have the ts parameters > specs for the q 15. Wondering what the qts is on the high qts model as opposed to the standard qts model ??? Standard is .41 / .42. I emailed the sales team at fi andnhe said is .02 higher but I heard it was .2 which would be .61/.62 not .43/.44 to me .02 higher is not enuf to make much dif so im just hoping someone can clarify and confirm the specs for me thanks

 

[AndrewHD 10+ year member]

Hey man. Glad I found this forum...tell me u still have the ts parameters > specs for the q 15. Wondering what the qts is on the high qts model as opposed to the standard qts model ??? Standard is .41 / .42. I emailed the sales team at fi andnhe said is .02 higher but I heard it was .2 which would be .61/.62 not .43/.44 to me .02 higher is not enuf to make much dif so im just hoping someone can clarify and confirm the specs for me thanks

The specs do not ship with the woofer. I would assume the qts should be closer to .707. So I would go with .61/.62. This is just what I think, I have no specs to go by.

 

[bridan222]

The .707 you're thinking of is qtc not qts. But thanks anyway :^/

 

[Cloud77]

2.5 Cu. Ft. My Q 15 sounded oh so sexay sealed. But then I went ported..

 

[Cloud77]

Years ago I had a pre-09 Q with new parts on a mmats D300hc with stock electrical and a walmart everstart marine battery in the trunk:

 

[tc300 10+ year member]

Years ago I had a pre-09 Q with new parts on a mmats D300hc with stock electrical and a walmart everstart marine battery in the trunk:

Few years ago I ran a 18" Q with BP option sealed... Lil over 4cuft and some Pollyfil. Amp was a mmats DHCX2200.1.