You've got a few things to look at.

First, if you're using stock Mach 460 speakers, aren't they 2 OHM? Running them through a 4 OHM amp is going to be a little hard on them.

Second, why are you using 5 1/4" speakers in the back deck? You should be running 6x8's.

How are the speakers hooked up to the amp? If they're bridged mono, it'll dump a TON of power to them, but in such a small speaker they'll be an overloaded mess.

Also, what kind of speakers are they? Are they 2 way, 3 way, or component?

If they're component speakers, which means separate highs and mid-bass, you SHOULD have a crossover module that will basically act like a traffic cop. Bass to the big speaker and highs to the tweeter.

If you can post up some pictures of the setup, it'd help us figure this out for you.

Personally, I'm in the middle of an install just like you. I GUTTED the 460 setup and I'm running a Pioneer Premier head unit with Kicker 6X8's out back, a Phoenix Gold amp and a JL Audio stealth box in the trunk.

I ran fresh wire to every speaker location since I had the interior out, and until you turn it on, it looks like a simple head unit upgrade. (I'm all about a stealthy appearance.)

I think I'm going to order some Infiniti Component 6X8's (mid-bass and separate tweeters) from Crutchfield today. They're on sale for $140, which is down from $200.

 

Not a problem let us know...

 

Its a vert....that is why he runnig 5 1/4"s, they are also in the side panels , no rear deck.

 

Welcome to the audio forum. There are a few mistakes in this post, no offence but you need to read a little more before you start giving advise.

 

Well, no offense to YOU, but maybe if you correct the mistakes, I'll see where I went wrong.

Other than the fact that I didn't realize it was a vert, and that I was ASKING if it was 2 ohm vs. 4, what's the problem?

Also, I think it should be pretty obvious when I called the amp 4 ohm, I meant the speaker.

 

Oh, and here's a great write up on some of this stuff:

http://www.flemworld.com/Mach460/Mach.html

Also, here's another bit of information I found on the subject. I'm not sure how correct it is, but it's worth looking at.

http://forums.stangnet.com/538244-so...60-1000-a.html

 

I don't normally pick apart somebody's post but since it was requested I will be happy to help....

No, they are 8 ohm, not 2.

verts don't use 5 x 7s, and if you run a componant speaker with a baffle you can put the woofer and tweeter in the same location while seperating the signal.
There are a couple of points wrong in that sentence, overloaded mess? You are more likely to blow a speaker from not enough power then you are from too much.
That part was ok. Good choice on the PG amp, which one?

 

DAMN....well ttocs you gave him what he wanted...

I liked the "overloaded mess".....never heard that one before. When I hear that I think of Biff from "back to the future" getting all the horse sh*t dumped on him, dont know why but was the first think that jumped into my head when I saw that.

 

Thanks man. I knew the ohm on the speakers and amps was wrong, so thanks for straightening the info out. I make the self-centered mistake of assuming everyone has a coupe like I do. (dumb, I know)

I've never lost a speaker due to a lack of power, but understand how it can cause problems. All my issues were with too much power to not enough speaker.

It's an older amp that I've had a while. The car's at the shop having some exhaust work done. When I get it back I'll pull the model number.

 

people blow speakers off of factory radios all the time. It is not because the speaker couldn't handle 15 watts but because a lower power signal gets pushed into clipping sooner then a high power signal. I know my 3-ways up front are not rated at 400 watts, but they love playin it. As long as you keep the signal clean and unclipped no matter what is powering it(1 watt or a 1k) you will be fine.

The old pg amps are the only ones worth having. Mine is 8 yrs old and the last of the good series before they went offshore. Even the newer stuff is better then alot of brands but it is nothing like it was in th 80s-90s...