hey, i just got an amp, usamps 1000x, gives out the following power.

300 Watts x 2 into 4 Ohms
400 Watts x 2 into 3 Ohms
500 Watts x 2 into 2 Ohms
1000 Watts Bridged into 4 Ohms

now, i'm debating wether feeding 500 watts a piece between 2 12's, or feeding 1000 watts to a 15....what are the pros and cons of doing each?? i wanna get a real nice BOOM out of the subs, something i really feel. whatever i get, i plan to put in a ported box.

any advice appreciated.

 

do 1000 watts on two 12's. What 12s are u gonna be using. I have couple of suggestions. I also like my music load after I got my w7 ported I would never go back to sealed, only if I had to.

Kicker L5 or L7s
Rockford power stage 1
JL 13W6v2 (not really 12s)


What gen TL do u have

 

i got a 2nd gen, 02

damn bro, i bet that w7 bumps, i've heard only good things about it.

well, the two things i was comparing were one 15" resonant engineering xxx vs. two 12" treo ssi subs. getting the one 15 would be cheaper, but i was wondering if its worth an extra 60-80 bucks to get 2 12's.

 

o yeah, why would you say to go with 2 12's??
this is what everyone is saying, but i'm not really sure why they say....

 

15's really dont make very good sound quality. a term thrown around is a smaller sub 12 or 10 is "faster" and is quicker to respond to the music. This is more of a visual term because the smaller sub has less surface area so it can be in more control of itself. Honesly, you should go with 2 12's over 1 15 anytime, unless you are in some competition that goes by number of subs. 2 12's will actually go louder than the 1 15...in most situations, and you they will sound better.

 

I would also go with two 12"s. Do, however, pay close attention to the impedence of the subs you are considering.

 

actually, now that you bring it up, i am kinda confused on this one.

ok, if i go with the two 12's, i can get them with either dual 2 ohm or dual 4 ohm voice coils.
the amp puts out 500X2 watts into 2 ohms.

now, would i go with the dual 4 ohm voice coils, and just wire each seperately (as in +L into + of left sub and -L into - of left sub, then same with the right) ?? cuz i know sometimes you gotta do wierd shit like +L into + of right sub......etc.

 

If you decide on 2 12's, then you are correct. Get dual 4 ohm subs. Then just wire both subs in parallel, + to +, - to -, and run them 500 x 2. That is actually a little better than running them both at 1000 bridged because being bridged, if one sub was to blow, the other sub would then be presenting a 2 ohm load bridged to the amp and that could cause a problem.

I too, would say go with the 12's. I have never been a fan of anything larger than that. I use a single 10 in both my vehicles but, I am not really into loud as much as SQ.

 

Actually AcuraX2, that is incorrect.

The only way to wire two dual 4 ohms is a 1 ohm load or a 4 ohm load. Since his amp is 500x2 at 2 ohms you need to get two dual 2 ohms and wiring them like so:



Since it is 1000 watts bridged at 4 ohms you could also run it like this:



Really doesn't matter, you can either run it at 2 or 4 ohm load and your subs will each get 500 watts. Just make sure with whatever you get, that it is wired correctly.

 

I am sorry, where was I incorrect? If you have two dual 4 ohm subs, wire them in parallel, each sub is now at 2 ohm. This is 500 x 2 @ 2 ohms. If you take the same subs wire them in parallel and then wire them to each other in series, you are back at 4 ohm. This is 1,000 x 1 @ 4ohms.

 

Hey Uncleb,

I'd probably go the 2-12's in your case too. That US Amp is nice but the XXX would be really underpowered with only 1000 watts, They are really power hungry. Typically you need to have atleast 1200W at the very minimum but more like 1400w and a big ported box.

The SSi12's ar 750 Watts RMS power handling each so these will be slightly underpowered as well, but I think you will get better results. And I'm sure the US Amp is a little under rated as well, probably more like 1100 watts or so. Did it come with a Birth sheet?

If you want some RE subs I would look into the RE SE's. Nice SQ and they are 600 watts RMS, good match with that amp.

If you really want to do the 1 sub set up, I would look into a Brahma, even though they can handle a lot, they also sound amazing with less wattage, You can make a Brahma sound incredible at 800 watts. If you do something like this, it would give you room to upgrade in the feature by getting another amp say at 2000 watts and feed it to the Brahma, now that would just be rediculous.

And don't let people confuse you by saying 15's don't make for good sound quality, I can easily disprove that statement. If a sub is made for SQ then it will be able to reproduce the music with sound Quality no matter what the cone area is. My 15" XXX or an 18" or a 13" W7 or a 15" Brahma etc. sounds better then 99.9% of the subs out there.

 

Because you said to run them 500x2 which is a 2 ohm load for that amp. And the only way that would work is if you get two 2 ohm DVC's not 4 ohm.

If you want two 4 ohm DVC's you have to Bridge the amp and it will be running at 1000x1 at 4 ohms.

 

If you have a two channel amp, capable of running 500 watts into each channel at a 2 ohm load, then you can run two dual 4 ohm subs, wired in parallel. You wire each sub in parallel, which makes each sub 2 ohm and you run one sub to each channel. 500 watts into each sub @ 2ohm. If you have 2 ohm voice coils, you are going to be running at 1 ohm or 4 ohm per sub. I am saying run one sub per channel 500 watts x 2 @ 2ohm

 

You can't man.....

See the diagrams I posted. The only way to run (2) 4 ohm DVC's are like this:

http://www.rockfordfosgate.com/rftec...=14&image.y=10

You have to Bridge that amp if you want 4 ohm DVC's which would be 1000x1 @ 4 ohms not 500x2 @ 2 ohms.

 

Your diagrams are showing both subs hooked together. You do not have to hook both subs together. You can run subs in stereo. 500 x 2 is 500 watts into 2 channels @ 2ohms each channel. All you do is hook up one sub to each channel. One dual 4 ohm voice coil sub wired in parallel to each channel. This presents a 2 ohm load and each 500 watt channel has its own 2 ohm final load sub.


You are doing the same thing if you wire both subs together as splitting them into two seperate channels. 1,000 x 1 @ 4 ohm is the same thing as 500 x 2 @ 2 ohm. You are just not hooking both subs together. If you have both subs wired together to achieve the final 4 ohm load and one sub was to blow, the other sub would cause the amp to see a 2 ohm load and probably go into protection mode.

 

Oh, I see what you are saying. You're right, It can be wired that way as well. I wasn't thinking of wiring them seperately.

I stand corrected.

 

No problem. You had me thinking I was going crazy for a moment.

 

hey, thanks for the help guys

lightbeing, i actually did order a brahma 15, but that damn thing is taking waaaayy too long, apparently they're out of cones or something. you mentioned the re se's, never heard too much about them....have you ever heard them?

 

15" RE XXX subs are amazing, Orion makes a good 15" sub, Brahma makes 15" subs...

all of you who stated previously that you avoid 15" subs is because you are shopping at circuit city/good guys/tweeter.

there is a lot more out there

=/

 

well, definately i've heard that re's and adire 15's are awsome.... what i want to know is what is the difference i will hear between the two options??
i'm assuming that the 12's will play louder, but the 15's have the potential (HAVE THE POTENTIAL, it also depends on box, i know) to give the deeper lower cleaner bass.....i could be wrong though....anyone?
i'm not planning to upgrade this system, so being able to add another 15 if i go with a 15 now is not a factor.

 

no not really. I have heard my share of subs...from 8 inch to the freaking huge Kicker XSolo. I know that a 15 inch sub is just not necessary for music in a car unless you want to listen to Bass tests all day or go to competitions were max SPL is key.

A 15 is way heavy and it requires a huge ass heavy box. While a 10 or 12 inch sub will play plenty loud and low for %98 of all music and is lighter and smaller for your trunk. 2 12's are even better because they can play very loud and low. My subs arent top of the line by anymeans...XMax of 13 mm isnt bad but nothing like some and they are in a sealed box. I was skeptical that they would satisfy my occational "bass head" times, and they do. Plus I dont think my car could have taken much more for this amount of time.

I just cannot justify a big time 15 in our trunk. If I could do it again, I may get 2 10's or maybe 1 12 is a good ported box.

 

Actually, I meant that you could get a 15" Brahma now and feed it like 800 watts now and it will sound awesome, then in the feature upgrade your amp and give it like 2000 watts and it will sound rediculous!!!!

 

Actually the 15" XXX and 12" XXX weigh almost the same. i think the 15 is like 10 pounds heavier, the magnet is where all the weight is and I think they use the same one. 15 just has more cone area. More cone area= more output at all frequencies, not just the lower frequencies.

 

True, but the extra mass/surface area of the cone, generally at least, limits slightly the SQ of the sub. They tend to "hang" on notes more, due to the inherent slower repsonse.

 

go with one XXX 12 ported with a 1000 to 1500 watt amp and call it a day.

 

yes, not just as simple as more cone area = more SPL A good 10 or 12 inch sub will produce the same output as a lesser 15...Basically I just think 15's remind me of a rap video, or what was needed 5 years ago to get any good SPL. just arent needed in a trunk. Now in a large home theater...a 15 is almost a must to hit the very low notes in some movies, but for music, isnt needed.

 

Actually, I was agreeing with what you are saying.

 

I know...I was agreeing with you also ( I thought this smile was too funny to pass up)

 

Guys, Bigger subs=more output. a 15" XXX does not respond any slower than a 12" XXX. It has nothing to do with being able to hit the lower frequencies. A 12xxx will get just as low as a 15xxx. Why would clubs and concerts etc use bigger subs like 18" 20"? Because they want the most output you can get from a single sub. Not because they are interested in hitting lower frequencies.

It's not about the lower frequencies, it's about every frequency. That's why I chose a 15xxx.

 

The new Kicker 2500.1 and the XXX 15 and call it a day ok......

 

haha no shit...might as well bolt your trunk down while your at it, because its going to rattle like a BIATCH!!!! mine does pretty bad now...and I dont have near that kind of air movement in my trunk!

I went to a Kicker show right when the SOLOX came out and they had 4 of the biggest Kicker amps all wired to it (10,000 watts RMS) and it was in their 18 wheeler truck trailer. It was really amazing how much air that thing was moving...felt like I was in front of an industrial fan or something!

 

Well, most of that is true. The larger the woofer, though, the lower frenquencies it can hit. Look at any manufacturer's specs for a line, generally, the larger the speaker the lower their frequency response. Yes, the larger the sub, the larger the potential output for a sub. Clubs and concerts, however, are not foremost concerned about sound quality, they are concerned about output. Look at most SQ competition vehicles, a vast majority of them use 10-12" subs. A few use 15s, but it is rare for them to use an 18" sub.

 

Jayhawk,

All of that is true regarding the XXX. Like I said a 12xxx can hit the same low frequencies as 15xxx. They can both go down to 20 hz. Anything below that is inaudible to the human ear.

Ofcourse, clubs and concerts don't care about SQ, my point was they use the larger subs for output. But in regards to a sub like an XXX, the SQL is not effected by the diameter of the cone area, nothing is lost going bigger, only gained..

H ell you can get an 18 XXX, in the right install i.e box, power/watts and the SQ will remain the same top notch that RE stand by.

 

While this maybe true for the XXX line of subs, it isn't necessarily true for all. XXX are baddass subs, BTW.