Question about Alpine PDX-1.1000 1000W x 1 Car Amplifier Car Audio Amplifier

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I just purchased and had installed an alpine pdx-1.1000 amp. powering 2 12" jbl's. while the owner was demonstrating this to me, we had it going loud, and it blew its 4 fuses. once he replaced the fuses, it worked fine again. my question is, are there some performance fuses or more powerful ones that i can use to prevent the fuses from blowing. the ones he put in, were fuses that had the number 25 on them, and there was 4 of them. any help is appreciated. dave.

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  • bigconanman Mar 18, 2008

    i have dual 12 inch jbl's. i beleive they are 6 ohm. and the place that did the work, are very well known, theyve won numerous awards, and world championships. so, i know they know what they are doing. not a doubt in my mind about that.

  • bigconanman Mar 19, 2008

    ok, the name of my sub woofers are JBL W12GTI they are Dual 6-ohm voice coils Power handling Peak: 4,000 watts
    Power handling RMS: 700 watts

    i got this info from the website for the woofers. maybe this info helps.



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Technically, the manual says the amp should have 20A fuses, so by putting 25A fuses in, you've allowed more current to get to the amp before the fuses blow than recommended. I'd be more concerned about why the amp is blowing fuses.

If the subs are single 4 ohm voice coils and wired in parallel, you're fine. If they're dual 4 ohm voice coils, and everything (subs and voice coils) are in parallel, you're putting a 1 ohm load on the amp, which it's not rated for.

Posted on Mar 18, 2008

  • Tygh Duval
    Tygh Duval Mar 19, 2008

    I'm not doubting the installers capabilities. I'm just brainstorming reasons why the amp might be blowing fuses. In my opinion, swapping fuses for higher rated fuses is not a safe thing to do, but hey, to each his own. I guess I'm just more "by the book".

    Sometimes there are "slow blow" versions of some fuses that take longer to blow at their rated current. This allows some spikes to occur without blowing the fuses immediately. Unfortunately, I'm not sure I've seen the type of fuses used on amps in the "slow blow" flavor.

    I'd be interested in knowing if the subs are dual 6 ohm.

  • Tygh Duval
    Tygh Duval Mar 19, 2008

    Thanks. Nice subs, btw. The only problem I see is if the DVCs and subs are paralleled. If so, that's a load of 1.5 ohms on the amp. Since the amp is rated for 2 ohms, 1.5 ohms could overdrive the amp, causing the input fuses to blow. I'm sure there are amps out there that are rated for 2 ohms but still have a little "headroom" for lower impedances, but others get real unhappy, real quick.

    If the installers wired the subs DVCs in parallel and the subs themselves in series, that'd total 6 ohms, which the amp could do (although you might not get full power from the amp).



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