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justin justin justin... u name on thing out of how many? u go to maxxsonics and you try to get on there team call md and give it a shot! its not easy if it was everyone would have one... i talk to ryan and i talk to kiki online thats it! and yes i do ask them questions and i ask them there opinion on things so what im still learing i never claimed not to be. GO CHECK THE FING SCORES!!! I LOST DECIBLES AT FIRST YES! but i regained them in tuning and i figured out what was wrong. THATS CALLED TESTING AND TUNING AND LEARING!!! all this sh*t justin and you still havent proved to me y a line driver wouldnt help? or y it would automaticly cause clipping! and the alternator thread was bs anyways it was my supplier not specifally me so whats the diffrence! what did you do justin how many times have you competeted? ur turning this into a pissing contest about who knows more about what when in actuallyity its total bullsh*t. u go ahead think your far superiour than me and everyone else. stroke your ego all you want. i dont really give a sh*t and i dont think anyone else does. i checked some old posts when you were new at this so what if you have 2 more years on me its called learning!!! and again i never claimed to know everything like you stated... im an spl guy your an sq guy i know my forte you know yours! your the algrate car audio god justin i should bow down and take it like a man because you are so much better than me! congrats you happy now? now leave me alone and go about your buisness. all you have is personal attacks and credibilty attacks no real facts like i stated in the begining untill you have hard facts i dont want to hear it. im done with this thread because u have made it a pissing contest of whose better than who. and that aint what this is about. its about helping people not acting like asses. im done with this bullsh*t.

I realy don't care to check the scores. Even if, you only gained .6 with a second 15" and 3000 watts.

woah, calm down guys..

i am calm like i said im done with this bullsh*t ego trip. i learned from my testing there is no point in not trying its called testing justin...

alright we both got out of hand... im sorry justin just dont like when people attack my credibility. u are a good guy and were both straigt shooters which is y we clash so much... and we both come off like asses... guess were just to much alike... either way im sorry for my outbursts. we should be learing from each other not killing eachother... lol

Whoa, don't give me credibility. SPL isn't my bag, baby!

Typically you'll gain a decibels by clipping the crap out of your amps, though. Pretty common in SPL comps :) Line drivers allow you to further do so.

Same here, lets just let it die.

ok, firstly let's all step back and take a breath.
I'll theorize a little herebased on fact, and maybe it'll make some sense of all this.

first, let's realize that even with all things being the same, you can do three passes on a mic and get three different scores. Anyone who's been through the lanes, for any type of event knows that. We'll take that as a given, and say 1dB could be attributed to a change in the weather, or a butterfly in Malaysia flapping it's wings. Whatever.
That not being the case, let's consider some other possibilities:

we know a 4 volt pre-out on a head unit is only 4V at full volume with a test tone (clean sine wave, 0dB reference) so since most head units produce distortion at that volume, we tend to use lower volume points on the knob as our referenced "full" volume point. This means your signal voltage may only be, say, 2 volts, or 3 volts.

This affects the input sensitivity setting on your amps, in that instead of setting them for 4 volts, you'd want to make the input stage of the amp more sensitive and set it for about 2 to 3 volts to get a clean, full power signal at what you use as a typical listening volume. (This doesn't make your amp clip if you stay under full volume, since you essentially just chose to use a lower voltage as your reference "peak.")

Now, we get to Bill's situation.
a line driver can further overdrive the input stage of an amplifier with higher voltage (although using a line driver is like interpolating an image. it adds amplitude, but no resolution to the signal, so you're basically just boosting a weak signal, and boosting the noise floor along with it.) If he did indeed get a boost in SPL from the line driver, it would have been the same result as increasing the sensitivity of the amp input stage..
remember your source signal only really consists of two factors (X and Y) amplitude, and frequency. a line driver increases amplitude. The frequency is a factor of the source material.

There are limits or a max and minimum to how much you can adjust the sensitivity though, so if you have your amp set naer it's limit already due to a weak source voltage, the line driver gives you more range in voltage, and thus more room to play with the amp's "gain" or input sensitivity adjustment, which may be Bill's case here.

Ideally you want a sttrong line voltage from the had unit itself though, as that would hopefully mean a strong DAC and output stage for the line driver, and a good clean high resolution signal for the amp to work with. garbage in = garbage out, so the stronger the source signal, the better the end result.
keep in mind that all you're really doing here is taking a very small signal and making it bigger, so the more cleanly you can do this, the better it will sound.

really line drivers are meant to help clean up a signal, or keep it clean with longer interconnect runs. They aren't made to increase volume, and higher line voltages don't equate to a louder system as was initially asked.
While Bill may have gotten an extra dB in a competition at full blast, burping the system, that isn't a difference you'll notice for daily driving.
The best way to get a louder system is still more power (and this has it's limits), or better/more speakers (this brings it's own problems if you ad speakers, or higher cost for better ones), or better system design in regards to things like speaker positioning, enclosure design, and so forth.

just a few random thoughts and observations. take them as you will.

thanks kiki i apologize for my misbehavior ruff few days... got out of hand and it looks asthough me and just have valid points

only one who should appologize is justin, imo.

he kind of lashed out on you... or so it seemed to me.