Printer Friendly Forum Posts - fosgate hx2 &1500w amp

I'll help when I can, I've got a remote start and an alarm I'm working on right now, think I've got one licked (bad brain). Same dude that posted yesterday? With two subs? Repost the subs and amp for me so I don't have to surf too much please. Back later.

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Top Secret, I can tell you but then my wife will kill me.

If you don’t mind I can try and help you out.

RFD2212 12" HX2 DVC 1000watt sub
501s 2 chan 1500 watt Punch amp

Now your sub can only be wired to 2 ohms (parallel) or 8 ohms (series). Your sub and amp are not a very good match for one another. I would suggest you exchange your amp for one that puts out 500 watts rms X 1 @ 2 ohms. You may want to look at the Fosgate 500BD https://www.purecaraudio.com/index.asp?PageAction=VIEWPROD&ProdID=303 Or the JBL 600.1 https://www.purecaraudio.com/index.asp?PageAction=VIEWPROD&ProdID=324 If you want to use your current equipment ( not recommended) I would suggest that you wire your sub in series https://www.audiobahninc.com/tech/wiring/Series_Series_dual_4_ohm.pdf and bridge the sub to the amp for a total output of 250X 1 @ 8 ohm.

Thanks bberman, I would suggest the same thing for you, you need an amp that is 2 ohm mono stable, a Rockford 501BD or similar amp would do a great job for you if you are going to use only one sub. If you plan on running a second sub, we need to know this now to find the right amp for you in the long run.

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Top Secret, I can tell you but then my wife will kill me.

You should also look at an Alpine MRD-M500 https://www.crutchfield.com/cgi-bin/S-EL41FJeiRzg/ProdView.asp?s=0&c=3&g=130&I=500MRDM500&o=m&a=0&cc=01&avf=N

or a JL audio 500/1 https://www.jlaudio.com/amps/5001.html

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thanks guys, so i need to look for (x) watts RMS @ 2ohms right? how do i wire a DVC to make my amp put out 2ohms? im thinkin maybe Fosgate 351M 1 channel 350 watt amp, it says 350 rms @ 2ohm.

Be very careful on the amp choice, I would still highly recommend one that is a closer match to output power, unless you are not going to be playing your system long and loud. Usuallly with only one sub most people ask a little more of it though, or expect a little more, thus the smaller amp you are considering is a great way to damage your sub. The x figure should be = to that of your rms power of the sub. Now it does not have to be exact by any means and most Rockford amps are totally underrated. The smaller of the two amps would probably do most people just fine for anyone exect the hardcore bass junkie that wants to annoy the neighbourhood.

To wire in parallel is fairly easy. What you need to do is hook 1 voice coil up to the amp just like you normally would, the second coil is hooked up to the first coil, positive to positive and negative to negative.

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Top Secret, I can tell you but then my wife will kill me.

I've decided on a smaller sub, a HE2 12" 800max -400 rms, then the 501M amp is 350 rms @ 2ohms. no damage done correct? from what ive gathered that appears to me a good match, but what do i know. is that a nice match?

HE2 is a nice sub, more suited to a sealed box and sq than loud and big bass like the HX2. If you are on this path, the match is good.

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Top Secret, I can tell you but then my wife will kill me.

i called a local car audio place, they said all theyve got in stock is a 401s.. which is 2 channel, is that gonna be as loud or should i get online and go with a 501m

The 401S is a 2 channel amp that is not stable at 2ohm mono for any extended period of time, it is not a good choice for you. Make sure the amp is 2 ohm mono stable, most mono sub amps are. Lightning Audio B2.350.1 is also a really good mono sub amp to consider.

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Top Secret, I can tell you but then my wife will kill me.

thats amps what the guy at custom audio concepts, inc suggest to me, the 401s

Sounds like a commission sales person at work, it may be that this is the only amp he has left that will come close to what you need, trust us, it is not the right amp to drive one dual 4ohm HE2 or HX2 subwoofer. (dual 2ohm - different story)

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Top Secret, I can tell you but then my wife will kill me.

I'm not doubting you, it may be dual 2 ohm though. He said this is a common set up they sell, whats the case if its a dual 2 ohm?

If it is a dual 2 ohm, you are good to go. Wire the sub in series to achieve a 4 ohm mono load. This means to hook one voice coils positive to the other voice coils negative, this leaves you with one positive and one negative to go to the bridged outputs of the amp, in this case the 401s.

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Top Secret, I can tell you but then my wife will kill me.

Thanks, do you know how many watts i'd be pushin with a dual 2 ohm on the 401s??

The HE2 is usually stamped as a 400w rms sub and the amp as a 400w rms @ 4 ohm mono amp. Count on the amp producing more power than it states and the sub can handle more than it states, how much more, well it really depends on a lot of factors. How loud though, this depends on the efficiency of the amp, the input voltage the amp sees from the cd player, the source material being played, the type of sub box used.... there are a lot of factors that can make it sound good and sound loud.

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Top Secret, I can tell you but then my wife will kill me.

Alright, I may have missed something, but I don't remember seeing if you originally wanted (1) Power HX2 or (1) Punch HX2. The Power HX2's only come in 2ohm DVC (RFR31xx), while the Punch HX2 comes in both 2ohm (RFD21xx) and 4ohm DVC models (RFD22xx).

I saw Beberman reference the RFD (Punch series).

You could run (1) 4ohm DVC Punch HX2 from an RF Power 500bd or Power 501bd at a 2ohm total load (wired in parallel). The sub is 500 RMS, and the amps are both 500 x 1 @ 2ohms. It's a perfect match.

You would be A LOT happier with 1 Punch HX2 versus 1 Punch HE2.

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Squirrel
"No more Cpt. Kirk chit chat"
If its too loud, then you're too old
Donate to the12volt.com

BTW, for 10's and 12's...
Power HX2 is 1000 RMS 2000 Peak
Punch HX2 is 500 RMS 1000 Peak
Punch HE2 is 400 RMS 800 Peak

The specs for 8's, 15's and 18's are a little different

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Squirrel
"No more Cpt. Kirk chit chat"
If its too loud, then you're too old
Donate to the12volt.com

Here's the Rockford DVC Manual that covers the Punch HE2's, Punch HX2's, and Power HX2's for more info

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Squirrel
"No more Cpt. Kirk chit chat"
If its too loud, then you're too old
Donate to the12volt.com

I'm buying a 12" HE2 2ohm DVC and a 401s amp. I'm building a custom box, should i port it or make it sealed? The head units a Pioneer Premier deh-p360, mids& highs are 3.5" kickers and 4x10" kickers, im runnin the sub straight off the amps SW RCA output. I am putting it into an 83 Cutlass/HurstOlds. Is this current set up going to have any spl? I want to be heard coming from a good half-block or so, will i be able to achieve this with this set up?

If you want to be heard (SPL) then you would be better off running a 12" Punch HX2 (RFD2212) with a Power 501bd Mono amp. Why waste the money on a Class A/B 2-channel amp when you could get a Class D Mono amp that is designed specifically to run subs.

As for ported vs sealed...

Sealed is easier to build, more forgiving if you make mistakes, and smaller in size. They give above average performance at most frequencies

Ported is harder to build, less forgiving if you make volume mistakes, you have to incorporate port volume, you run the risk of having port noise, and are larger in size. They give excellent response at the tuned frequency, but poorer response the farther away from that frequency you go.

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Squirrel
"No more Cpt. Kirk chit chat"
If its too loud, then you're too old
Donate to the12volt.com

The HE2 is more of a sq sub that prefers a sealed box for best results. It can be made to operate quite good in a ported enclosure and provide a good spl with the tradeoff of a lower power handling and not quite as nice sq. I have no doubt that it will play to near or above the 130db mark, but it is a far cry from a HX2 in a ported enclosure powered by a bd501. If you have it in your budget to go bigger, I would, based on your last comments. Either way you go, it should sound fine. Good to hear that you are going to tackle your own box.

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Top Secret, I can tell you but then my wife will kill me.

wvsquirrel, just noticed your comments after I posted, nice to see two people bang on with recommendations.

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Top Secret, I can tell you but then my wife will kill me.

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Squirrel
"No more Cpt. Kirk chit chat"
If its too loud, then you're too old
Donate to the12volt.com

My cousin has two HE2s in a ported box and they sound great and really really loud. But the HX2s are definitely better.

I'm running (2) RFD2112's (2 ohm DVC Punch HX2's) with an RF Power 1000bd in my '97 Explorer Sport and it quakes.

Walty220 we wouldn't steer you wrong ;) The HE2's are RF's entry level DVC sub. The Punch HX2's are mid/high level, and the Power HX2's are part of their high line. If you've got the money in your budget to go up now, then I would. I've changed subs about once a year for the last 3 years, and am saving for my next upgrade (two Eclipse Titanium 12's and a second RF Power 1000bd).

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Squirrel
"No more Cpt. Kirk chit chat"
If its too loud, then you're too old
Donate to the12volt.com