Atlas 15s, jbl 1200.1 and an SQL/L box

Mithrandir · Post by **Mithrandir** » Thu Apr 21, 2005 5:12 pm

guess I will be too then hehehehe. I know u love me and my setup fishy

Mithrandir · Post by **Mithrandir** » Thu Apr 21, 2005 5:16 pm

oh yeah, and about sub soundquality, once i turn em up loud enough a lot of my car rattles so yeah, that takes away from the sq a lot hehehe

chinny · Post by **chinny** » Thu Apr 21, 2005 5:21 pm

Let your car rattle! LET PEOPLE KNOW WHAT YOUR MADE OF!! And if a thives tries something, peak our your window and shoot him in the leg. WEEEE

:excited:

Post by **GlassWolf** » Fri Apr 22, 2005 4:32 am

if I catch one more person who should know better by now mention using amplifier sensitivity input adjustment as a means of controlling amplifier power, or anything else that isn't specifically setting teh "gain" to match the line voltage, I'm going to drive to somebody's house and replace all of his or her stereo equipment with Soundstorm gear.

gain settings on an amp have literally zero effect on the amplifier's power output.
too much gain, and your amp will clip.
too little gain and the amp will just use the same amount of power to amplify a weaker, noisier signal (thus the volume decrease.)
this is going in the faq section one of these days when my sinus infection goes away and I can hear again, and don't have a headache anymore.

Fishy · Post by **Fishy** » Fri Apr 22, 2005 8:23 am

I don't understand that.

I know its not a good idea to use the gains as a volume control but if reducing them means the amp provides less voltage(output voltage = input voltage * gain) doesn't that also mean it is producing less power?

P = V^2/R

I'd think if there was a limit to a h/u's voltage output and you set the gains low enough you could limit an amplifier's output as well. I guess if you sent the h/u into clipping by maxing the volume control and/or playing a CD recorded at unusually high levels there might be a problem however.

I thought it was pretty simple, but maybe I don't fully understand how a voltage amplifier works.

-Fishy

subfanatic · Post by **subfanatic** » Fri Apr 22, 2005 9:36 am

Fishy

subfanatic · Post by **subfanatic** » Fri Apr 22, 2005 9:37 am

is his jbl 1200.1 still for sale, im looking for a second one for my second ti

chinny · Post by **chinny** » Fri Apr 22, 2005 9:45 am

Whats the real RMS in an Atlas 12', it says 350WRMS but people say they are under rated, that they will take up to 500rms? What do you guys think?

Mithrandir · Post by **Mithrandir** » Fri Apr 22, 2005 10:10 am

yes my jbl 1200.1 is for sale ill let it go for 300 + shipping, if I could afford to go lower I would but sadly I cannot, its still a great amp for that price. Id be very happy to sell it too you, ill test in on my subs to make sure it works if you decide to buy it because I havent had it hooked up in a long time. Im sure it works though.

Post by **GlassWolf** » Fri Apr 22, 2005 10:34 am

well the input sensitivity setting on an amp (gain is actually a misnomer) simply applies variable impedance to the input line voltage to attenuate the voltage to the ideal level for the input stage of the amplifier.
if you over-attenuate the input voltage, you'll have a very weak signal, which the output stage of the amp is still going to produce the same amount of power trying to amplify. the result is a lower volume (due to the overly attenuated input voltage) being amplified with the same amount of output power. you'll also have a higher noise floor, more distortion, and yes less peak volume.
if the "gin" is set too high, then you get clipping and flattened peaks and troughs on the sine wave input signal, which results in an amplified version of the same thing.. which means DC voltage sent to the speakers.