what is this 14.4v input ?

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bassam_zaman

Member - Posts: 23

Joined: October 02, 2003

Posted: November 19, 2003 at 5:23 PM / IP Logged

Hi everone, i want to buy this mtx 801d amplifier, and in the specs it says 500w x1 @ 2 ohm(12.5 v input) and

800 w x1 @2ohm(14.4V input)/ No i understand this means when the supply voltage is at 14.4 there is 800 watts. I have a 2002 chevy trailblazer, and on the battery gauge in the instrument panel, it is always at 14.0V-14.5V when te car is on, does this mean that the amp will run at 800 watts or what??? I nee to know as i have to purchase within the nest few days, thanks, Bassam.

nedgeworth

Silver - Posts: 264

Joined: November 03, 2002

Location: Australia

Posted: November 19, 2003 at 5:35 PM / IP Logged

Yeap your thinking there is pretty right. As the current increases the power output does. But yes roughly your amp will put out 800watts MAX.

What subs are you hoping to run off this amp?

forbidden

Platinum - Posts: 5,352

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Joined: November 01, 2003

Location: Alberta, Canada

Posted: November 19, 2003 at 6:37 PM / IP Logged

If this is a big amp with fusing to boot, over time I would expect the battery voltage to drop. As your vehicle is fairly new, so is it's battery, you really have not begun to put a constant drain on it. A high power stereo system is certainly a constant drain. Much like when you wear out a tire, your traction goes to sh*t, a battery loses it's capacity to maintain a constant charge level. This is a generalization, not gospel for the true battery / alternator person. A good rule of thumb is to look at the 12volt rating and match your subs properly to the amp at that rating. This does not mean that your amp always and only puts out 500w rms, music is dynamic and goes up and down independant of the volume control. If you have more power available above 12volts, great, awesome, the amp will provide even more power. Before I chose this amp, post up what subs you have so someone can see if it is a good match.

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

bassam_zaman

Member - Posts: 23

Joined: October 02, 2003

Posted: November 20, 2003 at 6:43 PM / IP Logged

Hi everone , ok i see that what im thinking is right.. Hey forbidden, if your battery starts becoming sh*tty the way you said, you can always change it right? Also, im running one audiobahn aw1200q sub, dvc(4ohm)(so 2 ohm, or 8 ohm operation), 700 watts rms, 1440 watts peak(ppl say these numbers are underrated, also the mtx numbers are underated), 12inch 120 oz. magnet. Its in a band pass box. I was thnking the MTX , cuz i could get a good deal , or the audiobahn a8000t amp , specs :

400 watts RMS x 1 at 4 ohms 800 watts RMS x 1 at 2 ohms MOSFET power supply requires 4-gauge power and ground leads — wiring and hardware not included with amplifier two 30-amp fuses 50-120 Hz low-pass crossover, 18 dB/octave variable bass boost (0-18 dB at 50 Hz) variable (20-50 Hz) subsonic filter preamp outputs cooling fan cobalt blue illumination phase shift (0-180 degrees)

The power input of the audiobahn is 800 watts rms at 2 ohm, which is already way more than i need and, also this i way underrated. Anyone have any better suggestions?? Thanks, Bassam.

bassam_zaman

Member - Posts: 23

Joined: October 02, 2003

Posted: November 20, 2003 at 6:44 PM / IP Logged

aorry i mean the power input at 12.5 volts gives you 800 watts at 2ohm

forbidden

Platinum - Posts: 5,352

Joined: November 01, 2003

Location: Alberta, Canada

Posted: November 20, 2003 at 8:16 PM / IP Logged

A look at the amp on the site shows power output of 500w rms at 12.5v at 2ohm mono. Yes this amp will work OK for you, I would shop for something a little bigger myself if I had your sub but this is a good amp for you. Yes if the battery voltage stays higher the amp will make a little more power but the dynamic or peak ratings are just that, they are what the amp may produce for a brief (instant) burst of power, not a sustained output level. If you want a sustained, really loud output I would look for a bigger amp, otherwise go for it, if it's in your price range it's a good buy.

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

bassam_zaman

Member - Posts: 23

Joined: October 02, 2003

Posted: November 20, 2003 at 10:20 PM / IP Logged

ok thanks forbidden, you said you own a shop with audiobahn amps or somthing, are the A8000T's a good choice just incase? Or will it be too powerfull for my sub? thanks alot for you help, btw where in canada are u located?

si90lude

Member - Posts: 24

Joined: October 27, 2003

Location: United States

Posted: November 21, 2003 at 2:21 PM / IP Logged

Hey, it is always better to overpower than underpower speakers, as long as you don't get carried away what is this 14.4v input ? -- posted image.

forbidden

Platinum - Posts: 5,352

Joined: November 01, 2003

Location: Alberta, Canada

Posted: November 21, 2003 at 9:02 PM / IP Logged

The audiobarn amp is not stable to a 2ohm mono load according to the book, I am a dealer of Audiobahn but do not expect to continue with the line. si90lude is bang on with his reply, a little too much power is never a bad thing, have a look at a slightly bigger amp, stretch that budget some, buy it right the first time. In Canada I can found lounging in the real honest to god home of most peoples poster girl from years gone by, Pamela Anderson, Courtenay, B.C. (for the sake of arguement she is from Comox, a whole 2minute drive away. My main store is located in Courtenay B.C. on Vancouver Island, our second store is located in Naniamo, BC also on the rock. Current weather conditions are below freezing, clear with wind off of the ocean, snow is expected, hopefully tons of it.

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

freakystyley990

Member - Posts: 33

Joined: September 25, 2002

Location: United States

Posted: November 22, 2003 at 2:13 AM / IP Logged

The MTX 801D will put out 400 watts at 4 ohms and 800 watts at 2 ohms CONTINUOUS. That power rating is at 12.5 volts. However, your power output will be more than that becase as your battery power increases, so does the amp's power rating since that rating is measured at a voltage equivalent to the engine being off. Your battery will put out somewhere between 13.3 and 14.4 volts with the engine running. The PEAK power rating is going to be much higher than that regardless but an amp's ability should never be measured by its peak output anyways. In my opinion, that happens to be a very good amp. I have always been a fan of MTX mono amplifiers.

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