JBL mono amp with 2 subs

HE2s will do you just fine and I've never had a problem with them in terms of reliability.  Of course use your common sense and if you hear distortion turn down the bass.  Do this and you'll be boomin for a long time.

As for the power, that amp will put out 600 watts total RMS at 2 ohms or 1 ohm.  So if you had two subs hooked up each would be getting 300 watts RMS (150 per voice coil).  That's PLENTY of power, trust me.

If you're getting two subs, you can either get the 4 ohm voice coils HE2s, or the 2 ohm voice coil HE2s.  It's really up to you, as both models should technically allow you to maximize the power output of the amp.  With the 4 ohm ones, you'd wire each sub's voice coils in parallel, and then both subs would run from the single amp output channel via parallel wiring.  The impedence on the amp would be 1 ohm but these jbl amps can handle this just fine.  Or you can get the 2 ohm voice coil models, and wire each sub's two voice coils in series, then both subs in parallel to the amp.  This would give the amp a total impedence of 2 ohms, which should give you the same power output as the other method.  Both wiring methods are shown in those diagrams posted by other members.

I prefer parallel to series wiring just cuz it seems less complicated but it's up to you really.  If I were you though I would get the 4 ohm version.  Here's why:  although you're gonna be using the jbl amp which is 1 ohm stable, let's just say it gets stolen or bites the dust, and you can only afford to replace it with some typical class AB 2 channel amp that's only stable at 2 ohms stereo or 4 ohms bridged.  If you had the 2 ohm voice coil subs (they were not stolen, for the purposes of this example)  you'd only be able to wire them up for an 2 ohm load or an 8 ohm load to the amp, but most amps are not 2 ohm stable when bridged.  So your only other option is to go with series wiring, putting the total impedence at 8 ohms and you'd be using significantly less power than the amp is capable of putting out.

With the 4 ohm voice coils, however, you would be able to hook them up in series parallel and give the amp the 4 ohms bridged impedence that is needed to use all its available power.  I know this situation is not very likely but since the two subs are basically the same, if you needed something to make you lean towards one or the other that might be it.

The HE2s aren't really low cost, although the answer to that question kinda depends on how you define "low cost".  But they definitely do provide very good bang for the buck overall--especially when compared to subs costing two or three times as  much.

Sorry, but once again I am back.  I looked around on Yahoo and on eBay for the 600.1 fairly cheap.  When I had my heart set on the 1200.1 and I was looking on eBay I came across a few 600.1 amps.  Now the auctions are over and the cheapest 600.1s I could find through Yahoo were $183 plus about 20 shipping.  Now there are a few 1200.1s still on eBay.  One with a buy it now of 256, another with an auction starting at 375 (good luck to that seller, both are new).  Anyway, my main question is this.  Is there a great risk to hooking up a 1200.1 to my existing 4 gauge wire with an 80 amp AGU fuse and setting the gains at 1/2, or maybe even 1/4?  I mean, if I can spend roughly another 80 dollars to get an amp that is twice as powerful, with a higher resale value, and more potential in case I ever get enough money to upgrade to better subs, why shouldn't I?  Please tell me if I am thinking about this all wrong.  I understand that with the 4 gauge wire, and the 80 amp fuse I will not be able to use the amp to its full potential.  But this way I can always decide to upgrade the wire and fuse later, I'll have the ability to upgrade to more powerful subs if I can in the future, and I think I may have a better chance selling the 1200.1 in the future if I chose to do so.  Please give me any feedback.  If you think I should wait for a cheap 600.1 to come along and forget about the 1200.1, please tell me so.  I know if I get the HE2s I could potentially over power them with the 1200.1, but If I set the gains down and dont turn up the volume after the sound starts to distort it should be ok right?

Here's another curve ball.  What do you think about the MTX 6000 series in a 12 inch running off a 600.1?  They are 250 watts RMS and I'm pretty sure they don't have dual voice coils.  The 8000 are gonna cost too much for me.  A pair of the MTX 6000 will set me back about 130 plus shipping, not bad, not bad at all.  What do you think?

Always another question.  Know of any reasonably priced (preferably around 100) 6.5" component sets?  I was looking at Audiobahns, but any suggestions are welcome.  You are helping me to build the hardest hitting Volvo on my street.  (I don't want to be too boastful)

Once again, thank you to all of the people who have been helping me along the way.  Any feedback, positive and negative alike, is greatly appreciated.

-Jon

If you only have to pay 80 bucks to step up to the 1200.1 then definitely go for that.  The 2 gauge thing is not all that critical, especially if you're not gonna be pushing it very hard just yet.  As long as you make sure to not over-power the HE2s you will be good to go sticking with those as well.

I'd probably pick HE2s over thunder 6000s if I had to pick between the two.

As for $100 component sets, I like infinitys but I dunno if you could find them cheap enough.