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Reload Thread: FI SP4 Sealed?

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    AndrewHD's Avatar
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    FI SP4 Sealed?

    Hello guys, I'm ready to upgrade from my Sundown SA-12's and am looking at the FI SP4. Do they beat hard in sealed boxes and is their SQ similar to FI Q's?



    2005 Impala
    DC Power 300 amp alt
    XS Power D3400 under hood
    Big 3 Rockford 1/0 gauge
    Eclipse AVN 726E
    Rockford T3 6.5 component set
    Rockford 1000.4-ADCP
    Rockford 2500.1-BDCP
    FI Q 15 Sealed 2.5 cu. ft




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    Re: FI SP4 Sealed?

    What are you looking for when you upgrade? The Sp4 should do very well sealed.



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    Re: FI SP4 Sealed?

    Looking to run a sealed 15 or even 2. I have a Rockford 2500bd-cp so I'm thinking that would only be enough power to run one. Would running 2 SP4's sealed on this power be ok?



    2005 Impala
    DC Power 300 amp alt
    XS Power D3400 under hood
    Big 3 Rockford 1/0 gauge
    Eclipse AVN 726E
    Rockford T3 6.5 component set
    Rockford 1000.4-ADCP
    Rockford 2500.1-BDCP
    FI Q 15 Sealed 2.5 cu. ft

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    SounDrive is offline SounDrive RCA



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    Re: FI SP4 Sealed?

    No need to run a 4 inch coil woofer on 2500w... A 3" coil woofer would be more efficient on that power



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    Re: FI SP4 Sealed?

    Quote Originally Posted by Tenacious. View Post
    No need to run a 4 inch coil woofer on 2500w... A 3" coil woofer would be more efficient on that power
    Yea that's what I am thinking. I was going to go with either 2 15 FI Q's sealed, 2 LMS-R 15's sealed or a single SP4



    2005 Impala
    DC Power 300 amp alt
    XS Power D3400 under hood
    Big 3 Rockford 1/0 gauge
    Eclipse AVN 726E
    Rockford T3 6.5 component set
    Rockford 1000.4-ADCP
    Rockford 2500.1-BDCP
    FI Q 15 Sealed 2.5 cu. ft

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    SounDrive's Avatar
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    Re: FI SP4 Sealed?

    Quote Originally Posted by AndrewHD View Post
    Yea that's what I am thinking. I was going to go with either 2 15 FI Q's sealed, 2 LMS-R 15's sealed or a single SP4
    Have you considered going ported? A properly designed (and modeled if you want to go the extra mile) enclosure will have a very flat response and give greater output.



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    Re: FI SP4 Sealed?

    Yes I have had several ported enclosures in the past but most of them blocked my access to the spare tire. I need trunk space more than audio also so this is another reason. Before I had 2 FI Q 15's sealed and still had plenty of room. I may just go back to the FI Q 15's with high qts.



    2005 Impala
    DC Power 300 amp alt
    XS Power D3400 under hood
    Big 3 Rockford 1/0 gauge
    Eclipse AVN 726E
    Rockford T3 6.5 component set
    Rockford 1000.4-ADCP
    Rockford 2500.1-BDCP
    FI Q 15 Sealed 2.5 cu. ft

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    Re: FI SP4 Sealed?

    Quote Originally Posted by AndrewHD View Post
    Yes I have had several ported enclosures in the past but most of them blocked my access to the spare tire. I need trunk space more than audio also so this is another reason. Before I had 2 FI Q 15's sealed and still had plenty of room. I may just go back to the FI Q 15's with high qts.
    2 15" Qs will take up more space than a single sp4 ported



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    Re: FI SP4 Sealed?

    Do 2 12's ported.



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