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Reload Thread: Fi Audio 18BL warranty issue - failed after an hour of use

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    keep_hope_alive's Avatar
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    Fi Audio 18BL warranty issue - failed after an hour of use

    I purchased a Fi 18BL dual 1 ohm. built a box for it and installed in a silverado. the silverado had two Massive Audio N4 amplifiers. The end goal was one on each coil and we started with that. did some testing, and it was stupid loud. resulted in my neighbor coming out to yell at me because we were shaking things off his walls during some initial testing.

    For break-in we wired it up on one amp with coils in series for a 2 ohm load, 1kw per coil. End goal was 2kW RMS per coil (4kW Peak).

    the sub lasted for 3 hours total (install to failure), maybe 60 minutes of actual use. all but a few seconds of it was on music at a reasonable volume. even the sine wave signals were well controlled. the output was 139.7dB on TL shortly before it failed, a few seconds at a time looking for frequency peak, not being pushed very hard. Gains set with a scope. good excursion but nothing extreme.

    coil unwound from the former. that is what is wrong.

    spent 2 weeks with Fi going back and forth, they asked all sorts of questions (typical stuff i would ask). finally gave me an RMA.

    they reviewed the sub and said the suspension was still stiff and the sub looked new. no damage or issue other than the coil off the former. they said that because the sub was still stiff, i must have wired the coils out of phase. that is their way of getting out of a valid warranty claim.

    i say the sub would not be possible of 140dB of output if the coils were out of phase. i know how to wire coils correctly. i say the sub looks and feels new because it only had an hour of use. of course it's stiff.

    i measured the coils after the issue and one was 1 ohm and the other was 2 ohm. i didn't measure them before. neither coil was open, the glue just let loose. i know coil resistance can change when a sub has issues, but i suspect mismatched coils is what caused the issue in the first place. i see this as a clear instance of a mfr defect.

    we are still negotiating.

    other's have experience with this?

    i have pics...



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    Re: Fi Audio 18BL warranty issue - failed after an hour of use

    thats jacked... and sorry, but 139 is not stupid loud




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    Re: Fi Audio 18BL warranty issue - failed after an hour of use

    are you sure that you gain matched? I dont know why you didnt just strap the amps, unless they arent strappable...




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    Re: Fi Audio 18BL warranty issue - failed after an hour of use

    Quote Originally Posted by RLDriverv2 View Post
    I mean what do you want us to say? we cant effect the outcome. or are you wanting us to join you in vilifying fi? sounds like you need to work this out with them. with all the good **** fi has done for me and many others for GRATIS,im having a hard time believing they are trying to screw you out of $10 of recone parts.
    recones are far more expensive than $10




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    Re: Fi Audio 18BL warranty issue - failed after an hour of use

    Quote Originally Posted by DbDesigns View Post
    recones are far more expensive than $10
    Not to fi they arent ...the customer yes




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    Re: Fi Audio 18BL warranty issue - failed after an hour of use

    And idk if id be more pissed that it failed so quick or only did a 139




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    Re: Fi Audio 18BL warranty issue - failed after an hour of use

    Quote Originally Posted by NASTY08IMPALA View Post
    Not to fi they arent ...the customer yes
    trust me, it costs fi more than $10 in parts for a recone. just the coil is about $10




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    Re: Fi Audio 18BL warranty issue - failed after an hour of use

    Quote Originally Posted by RLDriverv2 View Post
    I mean what do you want us to say? we cant effect the outcome. or are you wanting us to join you in vilifying fi? sounds like you need to work this out with them. with all the good **** fi has done for me and many others for GRATIS,im having a hard time believing they are trying to screw you out of $10 of recone parts.
    i am curious if anyone else has had a coil let loose from the former, and what the circumstances were/are.

    i have worked on two other vehicles this month with the same sub and no issues. at this time, Fi and I are still discussing it.



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    Re: Fi Audio 18BL warranty issue - failed after an hour of use

    Quote Originally Posted by DbDesigns View Post
    thats jacked... and sorry, but 139 is not stupid loud
    i know. we weren't pushing it, just looking for a vehicle peak. unclipped tones between 45-55Hz.

    the point is, if the coils were out of phase, would 139 even be possible? i think not.



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    Re: Fi Audio 18BL warranty issue - failed after an hour of use

    Quote Originally Posted by DbDesigns View Post
    trust me, it costs fi more than $10 in parts for a recone. just the coil is about $10
    Meh if so not much more ....still disappointing on the meter




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    Re: Fi Audio 18BL warranty issue - failed after an hour of use

    Quote Originally Posted by keep_hope_alive View Post
    i know. we weren't pushing it, just looking for a vehicle peak. unclipped tones between 45-55Hz.

    the point is, if the coils were out of phase, would 139 even be possible? i think not.
    I dont think that the coils were out of phase, but I do think that you may have gain matched incorrectly, I know you are a great installer richard, but we all make mistakes.




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    Re: Fi Audio 18BL warranty issue - failed after an hour of use

    Quote Originally Posted by keep_hope_alive View Post
    i am curious if anyone else has had a coil let loose from the former, and what the circumstances are.
    Sounds like a lemon to me ....ive seen lots of spider issues but no coils lettig loose..esp on that power..and i kno this is far from ur first rodeo so id say they are just jewing u around ....every company no matter how reputable has issues like this..just ***** fi chose to go about it this way




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    Re: Fi Audio 18BL warranty issue - failed after an hour of use

    Quote Originally Posted by NASTY08IMPALA View Post
    Meh if so not much more ....still disappointing on the meter
    when we measured 139 the vehicle was silent. during higher output testing the roof was letting go from the supports and the entire truck was vibrating loudly. we know it'll do a lot more, but we weren't out to break the thing, just look for a peak (which was around 50Hz).


    when wired to both, i used a scope and DMM to verify both were equal (within 10mV). i know how to set multiple amps. no, they aren't strappable.

    since then, an Alphasonic Mahem 12" is wired to the exact same setup and doing just fine a month later, nothing was changed on the amp. i had to build a 3-layer adapter to mount in the same enclosure (which is a bit oversized for the 12").



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    Re: Fi Audio 18BL warranty issue - failed after an hour of use

    •Massive Audio N4 Nano Block Series Monoblock Car Amplifier
    •RMS Power Rating (14.4V): ◦4 ohms: 650 watts x 1 chan.
    ◦2 ohms: 1000 watts x 1 chan.
    ◦1 ohm: 2000 watts x 1 chan.



    Q18 - Fi Car Audio Store

    sub says 1500 rms

    maybe you just heated that coil up and it unwound



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    Re: Fi Audio 18BL warranty issue - failed after an hour of use

    Maybe Fi is backed up and subs are getting rushed. If you set with a DMM for 1000 per coil I doubt you where getting over RMS. to me it sounds like they skimped on assembly.



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