Contour Enthusiasts Group Archives Forums Modifications Audio Perfect sub on its way back to the factory

You shoudl watch some of the SPL drivers and their like move. My MASS moves a LOT, but I cannot imagine some of the other higher excursion subs... scary

The Eclipse Titaniums (TC Sounds High excursion subs) can move 3.5". It's a very strange thing to witness, especially considering the subs remain linear and distortion free the entire time.

My Autotek subs have 2" excursion. They kind of freak me out to watch because most speakers would fall apart doing that much movement.

------------------
'99 SE Zetec ATX
Medium Steel Blue.
Tint, Mesh Grill, Badgeless, Sidemarkers,
pre '98 sail panels
Pollo_loco69@hotmail.com

Wow! I didn't know Autotek was making anything with that kind of excursion!

What is the model number?

The model number is SX-1266. Here is a couple pics.

My brother in law is running 3 Autotek 10's. Same model as mine and he is hitting about 148 db. Sounds awesome!

Ahh...I see it is also made by TC Sounds (probably just designed by TC and MFG by someone else).

I don't believe that MTX is referring to peak/max power when rating their amps at 14.4 volts.

I think that the "dynamic" term is referring to the potential RMS rating when the amp could receive a steady 14.4 volts. With other accessories running, changes in engine rpm, etc... the amp usually won't see that steady 14.4 volts. However, it should receive a steady 12.5 volts from the battery at all times (barring mechanical difficulties of course). Hence, the rms and dynamic ratings (as I understand them).

Also, I don't think that MTX uses peak/max power ratings for their amps. BTW, I consider peak/max power to be an absolutely useless measure.

If you REALLY want to know what an MTX amp is putting out, you need to look at its birth certificate.

My PRO502 was putting out considerably more than what it was rated at with THD<.005% too.

The "birth certificate" is what I was referring to. There are two ratings, 12.5 volt RMS rating, and a dynamic 14.4 volt. Dynamic in this case most definitely refers to peak power. Basically, the circuitry remains the same in the amplifier regardless of the input power, so the power at 14.4 volts should be no more than 15% higher than the rating at 12.5v. But on cheaper amps, could potentially be less.

Please don't take my message the wrong way, i'm not saying your amp is bad, quite the opposite, it happens to be one of my favorite brands. When you posted that the power rating was 117% higher with a 15% change in voltage it didn't add up so I checked the MTX website and found out the way they came up with the ratings on the birth certificates.

Oh, and I don't doubt that it puts out more than the advertised rating.

Sorry, but I'd have to say that I disagree. I don't believe that MTX's use of "dynamic" refers to peak power (the completely useless measure that bargain bin amps tote while clipping at insane levels of distortion). It refers to continuous/rms output at 14.4 volts.

Your method of comparing percentage increases in voltage input to increases in power output doesn't really work. I'm by no means an EE or anything, but I do know that there are a lot more forces at work here. For instance, it takes 10X the power to double the volume.

Here's a link to see how MTX rates their amps:

http://www.mtxaudio.com/caraudio/products/amplifiers/certPerform.cfm

Don't worry. I'm not self-conscious about my amp.

I got into MTX stuff a few years back when they had just finally started putting out quality stuff and were still charging bargain prices. They don't do that anymore.