# blew my amp lol need to know why?

#### mkskate35678

Joined May 12, 2006
5
ok this is what i did...............connected my 2 12's kicker L7's(750 watts RMS each) and then bridged it into my kenwood 7252 amp(170x2 at 4 ohms)

i know that it blew because i bridge it but can u explain to me how in a mathamatical way because i am really confused at how the whole Amps, volts, and watt system works

#### thingmaker3

Joined May 16, 2005
5,084
By bridging the amp, you made it's load half as much. Since E=I*R, I=E/R. You cut R in half wihtout changing E, so you doubled I. This means you doubled power out, since power = I*I*R = E*E/R. The components which were designed to dissipate only 170 watts were forced to dissipate 340 watts. The extra 170 watts generated 170 joules of heat per second (a watt is one joule per second, after all). The heat caused the temperature of said components to rapidly increase. This is why we say we "fried" the components.

#### mkskate35678

Joined May 12, 2006
5
Originally posted by thingmaker3@May 13 2006, 07:10 PM
By bridging the amp, you made it's load half as much. Since E=I*R, I=E/R. You cut R in half wihtout changing E, so you doubled I. This means you doubled power out, since power = I*I*R = E*E/R. The components which were designed to dissipate only 170 watts were forced to dissipate 340 watts. The extra 170 watts generated 170 joules of heat per second (a watt is one joule per second, after all). The heat caused the temperature of said components to rapidly increase. This is why we say we "fried" the components.
[post=17061]Quoted post[/post]​

lol screw it i think ill just still with the mono amps........but now in order to prevent the amp from frying would it be better to have a more powerful amp then the sub? so that i can know at what volume i can keep it on because the subs usually sound distorted after they go over their RMS while a amp i wouldnt know when im going overboard?????

#### mkskate35678

Joined May 12, 2006
5
Originally posted by thingmaker3@May 13 2006, 07:10 PM
By bridging the amp, you made it's load half as much. Since E=I*R, I=E/R. You cut R in half wihtout changing E, so you doubled I. This means you doubled power out, since power = I*I*R = E*E/R. The components which were designed to dissipate only 170 watts were forced to dissipate 340 watts. The extra 170 watts generated 170 joules of heat per second (a watt is one joule per second, after all). The heat caused the temperature of said components to rapidly increase. This is why we say we "fried" the components.
[post=17061]Quoted post[/post]​
like lets say i have my 2 subs(750RMS each)

should i buy two 1000 x 1 RMS amps

should i buy two 500 x 1 RMS amps

or should i buy two 750RMS amps JUST LIKE MY SUBS?

#### Papabravo

Joined Feb 24, 2006
13,741
Originally posted by mkskate35678@May 14 2006, 11:48 AM
like lets say i have my 2 subs(750RMS each)

should i buy two 1000 x 1 RMS amps

should i buy two 500 x 1 RMS amps

or should i buy two 750RMS amps JUST LIKE MY SUBS?
[post=17071]Quoted post[/post]​
like do 'em all dude, u surely have more money than knowledge or experience

#### alim

Joined Dec 27, 2005
113
Originally posted by mkskate35678@May 14 2006, 11:48 AM
like lets say i have my 2 subs(750RMS each)

should i buy two 1000 x 1 RMS amps

should i buy two 500 x 1 RMS amps

or should i buy two 750RMS amps JUST LIKE MY SUBS?
[post=17071]Quoted post[/post]​
Hi depends on what you are using the amp for, 1000 watts may prove to be insufficient for you.

#### mkskate35678

Joined May 12, 2006
5
like do 'em all dude, u surely have more money than knowledge or experience
[post=17072]Quoted post[/post]​
[/quot

man i dont know what ur problem is but u need to relax

#### mkskate35678

Joined May 12, 2006
5
Originally posted by alim@May 14 2006, 01:25 PM
Hi depends on what you are using the amp for, 1000 watts may prove to be insufficient for you.
[post=17073]Quoted post[/post]​

well i would like a loud bass but i also want it to sound good in the car like with the speakers and all but im also worried about my windshield if it can handle the bass because when i had that other amp my windshield was going nuts ( would dynamat help)????

#### Papabravo

Joined Feb 24, 2006
13,741
I'm relaxed. I can write coherent sentences and paragraphs.

#### windoze killa

Joined Feb 23, 2006
605
Originally posted by mkskate35678@May 15 2006, 05:44 AM
well i would like a loud bass but i also want it to sound good in the car like with the speakers and all but im also worried about my windshield if it can handle the bass because when i had that other amp my windshield was going nuts ( would dynamat help)????
[post=17075]Quoted post[/post]​
So this is in a car???? Reminds me of a friend who once put a $12000 system in his$800 car. Nearly blew the doors off. One plus was he ultrasoniclly removed all the rust.

2 x 750WRMS speakers in a car and you are worried about your windshield. Personally I would be more worried about me eardrums.

Joined Jan 10, 2006
614
WHAT..??????

#### kubeek

Joined Sep 20, 2005
5,724
Originally posted by Gadget@May 15 2006, 09:52 AM
WHAT..??????
[post=17111]Quoted post[/post]​
Everything depends on the sensitivity of the speaker. 50W in speaker with 103db sensitivity equals to the loudness of 800W into a speaker with 91dB sensitivity...
+3dB = two times the power

The power is NOT the main factor, but many people (especially connected with car-audio) forget about this simple equation.

And about blowing the amp... You should not be able to blow the amp, if you use right impedance of the speaker. Most amps are designed in the way that they are capable of delivering the max RMS power for infinite time, provided the load has right impedance.

But sub-bass amps are a bit different, because with very low frequencies like 10Hz the impedance of the speaker decreases rapidly, so the amp is more loaded.

#### windoze killa

Joined Feb 23, 2006
605
Originally posted by Gadget@May 15 2006, 06:52 PM
WHAT..??????
[post=17111]Quoted post[/post]​
Is a measure of power.

Joined Jan 10, 2006
614
I.C.

#### windoze killa

Joined Feb 23, 2006
605
Originally posted by Gadget@May 17 2006, 07:03 PM
I.C.
[post=17176]Quoted post[/post]​

#### thingmaker3

Joined May 16, 2005
5,084
Hey Gaget, can you have a "look" at this amp that we're planning on bridging?

Joined Jan 10, 2006
614
Eye prefer to "look" at the Waves cycling while Eye Stand on the Bridge (& no, Ey'm not a Square).....

& BTW, who's Gaget..??

(Sorry mkskate, hope ya got your problem sorted now...)

#### thingmaker3

Joined May 16, 2005
5,084
Originally posted by Gadget@May 19 2006, 01:48 AM
& BTW, who's Gaget..??
[post=17214]Quoted post[/post]​
Hmm... dere seems to be one of d's missing. Has any body seen one of d's? Dere must be more of d's around somplace...