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

That woofer is made in China and is a chinese imitation of a TC driver. I hate to tell you this (Pollo loco) but it does not have two inches of throw either. They may tell you it does but that is just a marketing scheme.

The Eclipse Ti, is capable of 3"+ Xmax (you can push it with your hands and do it) but the magnet will never allow it to acheive this length. The woofer's Xsus (amount of throw the suspension allows) is well over 1" each way. However the Xmag (amount of the throught the magnet structure will support) is actually only 23mm (one way). Now that still is far, but not what they claim. So it is possible to move that far, but no amp will ever be able to push it that far since the magnet will not allow it.

In Reference to "gain" levels: (This is a one thing that irritates me)
Your gain IS NOT a volume knob or any sort of watt control (Someone said that to me once ...lol). If you have a 4v radio and your amps sensitivity is from 3V to 200mV your amps will produce FULL volume with the gain all the way down. Of coarse this is when the radio is producing 3V output into the amps input section. So by saying your amp was below half way means (I'll say it once) NOTHING. The gain is there to match the source unit's (radio, crossover, line driver, etc...) output with the amps input. If you have a Pryramid radio (just an example) it has 250mV output, you WOULD then have to have your gain all the way up for that amp to reach its full potential.

As for Dynamic power, most maufactures use it instead of Peak, that is just the way they are. Alpine use to be the same way, not sure what they do now though. MTX is a good amp, but remember they are a corporation trying to make money, they will tell you what they want to sell product. They do back most of there claims. Until you test the amp for yourself, how do you know the birth certificate is correct.

I'm not tryin to piss anyone off but that is how it is in the car audio biz....just my very long 2 cents.....lol

I really don't care either way. I think that they sound good and that is all that matters to me. I was just saying what I had read about them. Thanks for the info!

Yeah, whatever you say man, anyhow, my MTX amp puts out like 325 watts at 14.4 which is not its peak draw, meaning this is an average output for a given voltage just like RMS. so what i was trying to say is that the Infinity in question was probably getting a lot more that 360 watts from the ppi amp that i am assuming was rms because he probably matched the rms rating of his sub with the rms rating of an amp. I'm not an electrical engineer but i do know about car audio (certainly not everything).

If you really want to know the actual power of your amp, play pink noise (most DB drag cd's have a track with it) You will need a digital voltmeter, set it on AC. Play the track at the maximum clean output. Take a reading at the amps speaker terminals. At 4 ohm mono to get 325 rms watts that amp would have to produce 42.89V AC. Here is the formula for those calculations:

volts AC squared (times itself) / impedence of the load the amp is seeing x .707 (value of rms rating)

In your case it would be this:

42.89 x 42.89 (1839.5521)/ 4 (assuming 4ohm mono)= 459.88 Peak watts x .707 =325.14 rms watts.

Now this is just a generalization you would need an oscilliscope to actually figure out 100% dead on results. You can also do this at one dedicated frequency (20hz, 50hz...etc) these results will vary since the woofers impedence changes at differecnt frequencies and in length of testing the coil will heat up changing its impedence curve as well.

It was never mentioned which amp you do have, after checking the MTX site their new 75x2@4ohm amp does 120 x 2@14.4 and 300x1 @4ohm mono with 12.5 and then 425x1 at 14.4. (thunder 8302) So what you are saying is that your model MTX amp goes from 150 watts at 4 ohm mono to 325 mono watts with just a 2 volt difference?

Like I said before, I'm not trying to piss you off, lets be realistic though. MTX is a good amp I just think many people do not realize that real clean power will not hurt any woofer, once you add distortion ( adding the "loud" Button and turning up the bass control) that is when voice coils get fried. As long as everyone is happy with there system, that is all that matters