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here is how its set up in my 2005 crown vic lx sport.

20170511_200735_zpsyf2srhqa.jpg

The Stetsom amp was removed(DEFECTIVE) and replaced with a RF r600.4d which is pushing my mid-range. Then theres a RF 400.4 for front speakers and tweeters and the RF 1200.1 then cap.

Amps are hidden by the box like so

20170502_213410_zpsb0wvzsit.jpg

 

That's my old set up. I'm now running the FI X-series

 

 

 

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http://skyhighcaraudio.com/taramp-hd3000/

What size ports in that box? If you throw more power at those subs in that box, you may need more port to avoid port compression and chuffing.

25d9cf71-fff8-4b67-a8f5-28c80d5ea859_zps7d3fe7f6-90c4-4939-b709-43f0e5812212_zps

2018 Honda Civic Sport Hatchback (build in progress)

NVX Sound Deadener (Front Doors)
Stinger FAST Rings

Stock Electrical

SSA Evil 6.5's Front Speakers
Stock rear speakers

MB Quart ONX4.80 speaker amp
Rockford Fosgate T-1500bdcp
DC Level 4 12" D1 @ 2-ohm
Box In Design Stage
Stock Radio
My Build Log

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You could look into the skar rp series. The rp 2k is only 220 bucks on ebay and does over rated power. It should fit where the rockford is too or at least b close.

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1 hour ago, crownvictoria31 said:

here is how its set up in my 2005 crown vic lx sport.

20170511_200735_zpsyf2srhqa.jpg

The Stetsom amp was removed(DEFECTIVE) and replaced with a RF r600.4d which is pushing my mid-range. Then theres a RF 400.4 for front speakers and tweeters and the RF 1200.1 then cap.

Amps are hidden by the box like so

20170502_213410_zpsb0wvzsit.jpg

 

That's my old set up. I'm not running the FI X-series

 

 

 

You aren't really gonna swap some idmax's for some x's right? 

 

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If you throw 2250 watts (750 per sub) at those subs in that current box, you will not have enough port area to produce the results you are looking for, and will most likely cause a chuffing noise from the ports. Actually, right now you are on the low side for port area at 1200 watts, which could be causing some of your output issues.

Triticum's Port Area Calculator recommends a minimum port area of 34 square inches with Aero Ports for your current setup with 1200 watts (assuming you are tuned around 35hz) and a  minimum of 47 square inches with Aero Ports for your setup with 2250 watts being pushed to the subs. You are currently running 25.12 square inches of port area. 2 6 inch ports would get you to 56.52 square inches of port area, which would get you closer to optimum port area for that 2250 watts. The problem is that requires a length of 35 inches per port to accomplish 35hz tuning, so it is unrealistic for your box with that much power going to it. Adding a 3rd 4 inch port with your current 1200 watts would get you above the minimum 34 square inches of port area, but the ports would need to be 22 inches long each to be tuned to 35hz.

I get that those subs can handle more power, and we all love and support more power, but I just want you to take into consideration that box modifications would also help improve your performance.

25d9cf71-fff8-4b67-a8f5-28c80d5ea859_zps7d3fe7f6-90c4-4939-b709-43f0e5812212_zps

2018 Honda Civic Sport Hatchback (build in progress)

NVX Sound Deadener (Front Doors)
Stinger FAST Rings

Stock Electrical

SSA Evil 6.5's Front Speakers
Stock rear speakers

MB Quart ONX4.80 speaker amp
Rockford Fosgate T-1500bdcp
DC Level 4 12" D1 @ 2-ohm
Box In Design Stage
Stock Radio
My Build Log

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