BKOLFO4

If you add a second sub and cut your power in half, you are not going to see much gain, if any. You might get a little gain from less power compression, less heat, and you might not actually cut the amount of power you are seeing from the amp exactly in half.

Even if the gains/crossover settings are a little off, it WILL NOT hurt anything. . .

I run the MTX 12" shallows in my truck and they are awesome. Using an AQ2200 at 1 ohm and they take it like a champ! Been in the truck 33k miles now and still going strong.

Sorry - I have not been on the forum in a day or two. PM me some dimensions from your trunk and an email address. I can help you.

Recones have always taken forever for me. I just let customers know up front. It is a secondary business. As someone stated, they have been moving for 2 weeks. I would give them another week and you should be able to contact them. . .

Ha! It drives me nuts!! Every answer over there is 12-16 sqin per cube! I just like giving Mike a hard time. . .I've learned a lot from him through the years!

Haha. There you go again talking about things you know nothing about. Just visit the SMD forum - they will let you know you can't even begin to determine the amount of port area required without knowing how big the box is going to be. And don't even think about doing over 16 sqin per cuft - that is reserved for SPL applications only. Oh - and less port = better lows, more port gives you better high bass. If you can't remember these basic rules, just download everyone's favorite calculator over there - it figures all this out for you. Just keep reading my friend, you're learning.

I am going to run mine in 2.8 cuft tuned to 32 Hz with 40 sqin of port.

45-50 sqin of port would be nice for 3 of them. There really is no need to tune those 8's that low. I have not modeled them lately, but I would think you could tune a little higher without a big hump in the response. Not sure what you consider high bass, but anything over ~60 Hz will be controlled by your low pass filter, not the tuning frequency. The tuning frequency does not control the upper bass response, but what it can do is cause a peak in the response around and right above tuning that is quite a bit louder than everything else.

Man I love Mayhem subs. This one is going in 2.8 cuft tuned to 32 with 50 sqin of port. Massive Nano N4 (2000 RMS) for power.

That amp would destroy a pair of XXX 18's. Mayhems are another great choice.

Good answer helotaxi. You need both, but if I have to choose, I'll do more batts first. You just have to keep an eye on the voltage an allow the batts to replenish as the voltage drops. I ran the stock alt with 4 batts in my suburban for 2 years with 8000 watts. Did a single 250 amp alt and 9 batts with 17000 watts for another 2 years. My Astro was a single 250 amp and 15 batteries for 25000 watts. . .

Email Shawn at Fi. I am sure they will send you one for a few $$ to cover the shipping.

6.5-7 cuft tuned to 32-33 Hz with 90-110 sqin of port area. The exact design would come down to the box dimensions.

Don't forget, SP4 is not available in a 12".

Havoc was designed as a SQ woofer but can get loud, since it has decent BL force and good excursion.

SP4 would be another good choice. It is not going to be as loud as the Mayhem, but it will handle your amp without any problem and sound a lot like the Havoc. The SP4 models up as a low end monster. I have had several conversation with Scott about how it would be a VERY nice home theater sub. The Mayhem is still my favorite subwoofer. . .

Does not surprise me. Just back the gain off and enjoy the headroom. You could add a second Havoc or upgrade to a Mayhem.

It is not the best fix, but if it works, you know what the problem is. If it does not fix it, you may have a piece of faulty equipment.

That could have been just caused by the initial current the first time you connected the power/ground. Did you already have the power connected to the battery when you made the amp connections? What about while you were checking the grounds? You could try a ground loop isolator. Plugs in line between the RCAs and the amp and keeps the RCA shields from being a ground path, which it sounds like is your problem.

I would want more port area. 40 inches. And 30 Hz is fine.

I get so sick of: "make your box smaller and you will have less impedance rise" And "make your box smaller and it will handle more power" If we are going to make those suggestions, please add "but it will reduce the efficiency and change the frequency response. Low frequency output will roll off sooner, and output at X watts will be less."

Mike got schooled

If I have the correct model, you have 1500 watts at 2 ohms + punch EQ maxed (+18dB at 45 Hz) on a 1000 watt sub (maybe 1200 if you got the cooling option). And that is the thermal rating. Mechanical limits can be reached long before you thermally kill it depending on the box design. I would guess you killed the leads from too much mechanical excursion. . . Maybe you are lucky and something else happened.

What amp? Are they good hIgh quality RCA cables? Is there any noise in your main speakers?