what will happen ?
 

if i run a 1200.1pg amp (1554w amp) to a 27kx focal sub (600w max sub) http://www.focal.tm.fr/accueil_en.htm
ftp://208.187.38.55/Phoenix_Gold/Man...00.1manual.pdf

what will happen ?

this is sq set up

well it all depends on the gains, and the volume knob... if those 2 things are used correctly then nothing bad will happen...

Mark

Exactly what sq said...you don't have to set the amp to use all 1200 watts, just set the gain in proportion to what the woofer can handle...even better with an sq setup set gain on sub to blend perfectly with your fronts.

Don't agree with the above but maybe I am picky. An amp makes the same amount of power regardless of where the gain is set. The amp is going to make it's power into the load as determined by the sub. It should be fine provided you allow the voicecoils to cool. If you keep any sub pinned or even close to it's thermal limits with any amount of power and it cannot dissipate the heat, that sub is going to fail. As this sub appears to be a 4 ohm driver with a recommended power handing of 300w rms, it may be a good match depending on the 4 ohm rating of the amplifier to be used.

Here is a great link on a similar discussion.
http://www.the12volt.com/installbay/...TID=74226&PN=1

That I don't agree with 100%. the gain knob isn't a volume control. but I was getting at the fact that it needed to be level matched to the other amps for best results... I agree with you on that it doesn't directly affect how much power the amp is putting out since it is only amplifying the input signal, but where I tend to disagree is that the volume that the deck is set to, directly affect how much power the amp is putting out... number one, the amp doesn't put out the same amount of power as volume level 5, as it does at volume 35 for starters, so that plays a big part... you might run into problems using an amp that large because you will have to set the volume lower than you might like so that you don't over power the sub, which will result in possibly not having your speakers as loud as you'd like them, but still...


Mark

and as far as how much power the sub will be seeing... as per the manual, hooked up into a 4 ohm load, @ 12.5 VDC, it's putting out 250 watts, so even if you get double that because of a little higher voltage, I'm sure it will be fine, if the volume is kept in check...

Mark

i think that if you grab a test tone.....1khz and have the gains al lhte way down......and put your leads from a DMM onto the speaker output.....you will get a reading.....and if you raise the gain.......you will see an increase.....how much of an increase is depends on a few things......but i know that it will increase.

so i dont think it puts the same power output with min gains as with gains higher.

but you can also achive the same output on the speaker side with gains pinned and gains low with a line driver......but how much of a difference in sound i do not know.

any one know the answer to that one?which is better sq

high gains/no line driver = x output

low gains/linerdriver = same x output

according to our tests for spl i know what we encountered. but im curious as to what you sq'ers have found.

^ generally its best to have as much signal, and have the amp gains as low as possible.. This ensures system noise/noise floor is at its lowest, in theory.

a 4vRMS source is usually enough.

ok how / why can this be 12vds = 250x1 then 14.4vds=1200x1 and and 14.4vds=1400(dynamic power)

what # do i need to look at 250/1200/1400?

If you increase the voltage, you increase the power output. If you lower the impedence, you increase the power output. The 250w x 1 rating is a 4 ohm rating at 12 volts. The 1200 w x 1 may be a 1 ohm rating at 14.4 volts.

The 12v ratings on all pg amps are totally inaccurate, and should be disregarded, dont even look at them.
Unless your trying to determine what class to compete in IASCA :smilie_da

If you're giving the amp proper voltage and not producing a clipped signal (gains, etc.) you should have no problems. Now the life of the sub will depend on the length of time you are playing it. If it's a long time, then the woofer will likely fail.

And no, the T1200.1 puts out a healthy 1200RMS + @ 4ohms. When i had mine, the birthsheet rated it at 1594@4ohms. These little amps are highly underrated.

what is a long time?1/2hr 1hr 12hrs 24hrs 2 mins

if my setup is at low how long be for i kill the sub ?

This is a amp like the JL / series? If it is, you are going to kill the sub with this much power.

thank you

but haw long would it last ?

Depends on how the subs voicecoils can dissipate heat. Totally unknown.

you are asking a question like.....how long will my dog live.....or how many licks does it take to get to the center of a tootsie roll.....its hard to figure that out cause sound is first of all dynamic, second your headunit is a factor. third voltage is a factor. and so on and so on.
having the car on of off is a factor as well and there are way too many factors to predict how long it will last.

any woofer will last a life time if you take care of it.....or if can last 1 min playing full boar and it might last a split second playing a clipped signal...it might last 10 sec......too many factors to predict. you either need to give a tonne of specifics and then ask this one again or just take care of your equipment by not over powering. and taking it easy on those poor woofers/.

sorrey my Xwife sold my dog you need to lick 1-2 times befor you get there (center of a tootsie roll)

i was told to over power not under power so what is too much over power ?

a 600w sub fed 1554w run low to mid will die fast/slow



ps. and pat i can see a coffey come up just to get in your head

When people say it's best overpower, rather than underpower, they aren't talking about 5 times the RMS wattage of the sub. having a little more power on tap than you need is a good thing, the headroom is nice so that you don't have to have everything cranked to get a satisfactory output from the sub....

Mark