Question about Hifonics BX1500D Car Audio Amplifier

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General question I have two alpine swr-1242d in a ported box. any suggestions on how to tune my amplifier to go get the best results with my set-up? Tony

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  • tonytran813 Oct 28, 2008

    I'm Sorry, I should have been more specific... any suggestions on how to adjust crossover frequency, bass boost, etc.

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You could bridge the speaker wires going to the amp to get maximum power out of the amp to the subs

Posted on Oct 27, 2008

  • matt Stahulak Oct 28, 2008

    oh there isn't just those like black nobs that u can turn left and right to increase and decrease the amplification?

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What amp would be better to use with what speakers/sub? I have a KAC-7202 kenwood 920W maximum power (150wX2 RMS, 4ohms) (230wX2 RMS 2ohms) and then the other amp I have is a Alpine MRP-M500 mono power...


I'm using that Alpine right now for 2-12" subs and I have compared it to 6 or 7 other amps this month and most were 4 channel 150Watt/Channel Bridged to 300Watts x 2 and found the Alpine to be superior in both sound quality and loudness. The Alpine has also not turned off even with full volume for hours at a time, Very solid amp I was very surprised due to it's size!

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Pdx1-1000 keeps blowing fuses


It sounds like you have either shorted output transistors or switching transistors. You would need a multimeter and knowledge of transistors to be able to check them.

Mar 26, 2012 | Alpine Car Audio & Video

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Amplifier wont move subs


I dont know if this will help you but start at the deck and make sure that the outputs(RCA) arent crossed over to highpass and do the same at the amp make sure that its set for lowpass- set half gain -bass boost half gain- subsonic minimum - If that doesnt help try using an i pod with an adaptor that you can play it right into the amp this is to see if you are getting signal from the deck to the amp if it doesnt work with an i pod or mp3 plugged directly into it then you may have got you a blown amp going on- good luck with that

May 29, 2009 | Alpine MRP-M1000 Car Audio Amplifier

1 Answer

Have kenwood mono amp 4,2,1 ohm capabilitie. What is the best sub to run. The amp is 1600 watts, howmany ohms and 1 or 2 voice coils.


Hello pelikant75,

The best answer depends on your budget for the sub(s) and exactly what kind of sound you are looking to get. Your amps RMS output at 4 ohms is 200 watts and at 2 ohms, it's 400 watts. I could not find that it was 1 ohm stable.

If you are looking for the absolute best bang for your buck, I would highly recommend a pair of entry level MTX 10" subs, model 4501-04, currently priced by Crutchfield at $49.99. And if you buy a pair, they throw in a free Bass Slammer BS210S sealed enclosure. The MTX's power range is 112.5 to 225 watts each, right in there with your amps output. 2 of them in parallel give you a 2 ohm load, just right for your amps best power. And they sound great. You simply can't find a better deal for $100 bucks!

If you want a little better SQ, a pair of Rockford-Fosgate P1S410's should be considered. Again, going to Crutchfield, they currently have this one "BOGO" (buy one get one) for $99.99. You will have to provide your own box, though, no free one with these.

Finally, if you want the best SQ, and your budget allows, consider a set of Alpine SWR-1022D's for $179.99 each. These have dual 2 ohm voice coils, allowing you to series the coils and parallel the subs, resulting in a 2 ohm load to you amp just like the MTX's and RF's recommended above. You will probably want a somewhat larger enclosure for the Alpines as well as a fatter wallet. Your amp is right at the lower end for powering them, so they probably will not be as loud. But they will sound good.

One thing we haven't discussed is the box. The enclosure is just as important, perhaps even more important than the sub(s). More accurate bass is generally produced from a sealed enclosure. A ported enclosure will be louder, but at the expense of sound quality. And whether it's sealed or ported, the enclosure needs to have enough internal volume for the particular sub you are planning to use. A sealed box in the range of .75 to 1 cu/ft will be OK for any of the recommended subs. Add about 15-20% more volume for a ported box and keep in mind that the port needs to be specifically sized for the frequency for which it is tuned.

Hope this helps.

Apr 12, 2009 | Kenwood KAC-8101D Car Audio Amplifier

2 Answers

Alpine subs not hitting hard


could it be as simple as bass boost??? maybe you have the subs hooked up wrong... have to have the ohms right.....hopefully this helped

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Just wondering ..


square port (slot loaded) vented box tuned at 33 - 38 hz is the loudest deepest bass you can get

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Bying new set


i would try to keep everything matching for best clarity and product life...i wouldpersonally suggest alpine car audio...or if cost is a factor try to go with a pioneed amplifier and subwoofer combo.

Sep 02, 2007 | Alpine PDX-1.1000 1000W x 1 Car Amplifier...

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