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Beginner Audio

3.2K views 43 replies 11 participants last post by  JLTD  
#1 ·
Just bought two 10 inch mtx subs from a buddy, I need some help with what kind of amp to run them with, I have the stock HU in a 2005 kc se w/o navi and w/o the rockford fosgate package. they are both 4ohm, frequency repsonse 24Hz/200Hz, RMS 400/1000, sensitivity is 83.6db, voice coil is 2 1/2. If i need to put any more info on here let me know, thanks for any input guys.
 
#3 ·
First, you'll need a line out converter, or LOC for short; relatively cheap. Second, as mentioned before, get you a Class D mono amp, rated at about 800rms at 2ohms, run you some good 4 gauge power wire and ground, and think real hard about getting about a 2farad quick charge capacitor. You're box is going to be 80% of how good your subs sound, so don't cheap out on that; do your research and build yourself a good box.
 
#4 ·
I wouldn't even worry about a cap they are just expensive led number things. I have 2,000 watts running threw my truck and no light dim or any problems.
 
#7 ·
I know there are varied opinions on this, but having done this for a living for a few years(in the past), I pose this question: If caps were just "expensive led number things", why in the world would your major competitors, sponsored or not, be running them? The last time I checked the rule books, they have installation guidelines and so forth, going as far to say that 6 caps in series qualifies as a second battery.

There is not a battery, alternator, or combination of the two, that will charge as fast as a stereo demands. Even if you don't have light dimming, you have voltage drop, and that is just about the fastest way I know of to burn up equipment, or at the very least hurt it's efficiency and productivity. Not only will a cap make it easier on the existing battery and alternator, it will clean up the sound of a system. It is usually more apparent it the mids and highs sound than in the bass, but I have heard several systems benefit from a good cap while just running sub amps. Plus those "expensive led number things" give you a way to keep you eyes on your voltage, instead of our factory analog no number gauges that I have personally found inconsistencies and delayed readings and so forth. I mean, I know I'm a little more anal about this than most, and equipment design is better nowadays, but to me it's like insurance.

Not trying to start a debate here, but the facts are the facts. They are not "snake oil", or anything of the like, they have a certain purpose and function.
I wouldn't run over 500w without one, but like I said I'm a bit anal. Most seriously consider 1000w as a threshold of cost vs benefit.
 
#5 ·
Agreed^^^
If you have any problems, you could just upgrade the battery and you'll be fine.
 
#13 ·
No i dont build my boxes, but i just have subs now, but this summer im doing door speakers, so if your budget allows for door spear i say do it!

ps if you buy a box make sure you do your research and its good quality.
 
#16 ·
No, you would need to run 2 10's because the subs are 400 rms and the amp is 900 rms so it would most likely blow 1 sub, the door speaker amps are not very big ive seen some a little bigger that a pack of cigarettes.
 
#17 ·
ok well im gonna save myself some money and just use the bow the subs came with...which is 2 1/2 feet long and 1ftx1ft on the ends so it will stand up behind my drivers seat when i fold up the rear seat. i will sacrifice the space...o well. but my last question is, all i need now is a class d mono amp and an LOC right, am i missing anything?
 
#18 ·
If you have a aftermarket head unit you dont need the loc, but if you have the stock head unit then yes you need a loc, you will also need a wiring kit, a good wiring kit runs about 50 to 100 buck, just make sure its AWG certified and do not buy a cheap $20 one off of ebay they are not what they say they are! You should be good are you going to install it yourself?
 
#22 ·
#27 ·
disconnecting them will mean missing sound, the bass needs to be choked off of them preferably, but I ran mine full range with subs
 
#29 ·
Not the same size, but they are the same sound producing, meaning full range.
 
#43 ·
This amp would be okay with a single voice coil 4 ohm sub or 2 svcs wired in parallel for a 2 ohm load. If you run one 4 ohm sub, it will see 300 watts, if you run 2 in parallel they will see 250 watts each, so this would actually be well under their rms assuming you are still using the 10's you mentioned earlier with 400watt rms rating.