amp cutting off

[swangin68 10+ year member]

dont run it bridged to the amp inputs. run it stereo + - left, + - right and try that. same thing with the 6x9's. u have to lower the ohms. dont bridge it at the amp. run it straight...that should do it if u really are bridged both sets at the amp

 

[skadude016 5,000+ posts]

take a DMM to it and see the exact ohm the amp is seeing. I bet anything you have that amp running around .5-1ohm

 

[shortyg83 10+ year member]

Long story short you cant do what you are doing. A 4 channel amp is for 4 speakers not 8. you need to choose 4 speakers and run 1 of them to each channel. Bridging the amp and running those speakers is putting a 1 ohm load on each channel. thats what your problem is

 

[Stel 10+ year member]

It would help if we know what brand and model the speakers and tweeters are, or at least how many ohms they each are (it should be printed on them). Then we can figure out how they should be connected.

I'm still not sure how this is setup but I'm thinking you have it something like this:

Fronts:

Left 4x6 and 2 tweeters connected in parallel to amp channel 1

Right 4x6 and 2 tweeters connected in parallel to amp channel 2

Rears:

4 6x9's wired in parallel to amp bridged channels 3 & 4

The tweeters cannot be connected how they are (or at least how I think they are). They are receiving lower tones than they are designed and probably more power.

The rears are presenting a very low impedance to the amp, which when bridged can probably only handle a minimum of 4 ohms.

 

[Stel 10+ year member]

This site describes the difference between series and parallel (the first two diagrams):

http://www.bcae1.com/spkrmlti.htm

 

[XanderMoser 10+ year member]

You can't hook up tweeters like that. Tweeters need a capacitor, which is a basic high pass filter. The rating of the capacitor (farads) and the impedance of the speaker (ohms) determines the frequency which the tweeter would be highpassed at. The capacitor would go in series with the tweeter. Without this basic crossover, your tweeter is getting every single frequency that your 4x6 speakers are getting. Very very bad. I'm guessing your high pass filter on your amp is around 100 hz. Tweeters are rarely designed to go below 1000 hz. In car audio, usually at least 2000 hz. Your tweeters are probably blown already and sound terrible.

The way you hooked everything up, you are making a very low impedance load for your amp. Amps usually can't handle less than 1 ohm. There are exceptions though.

Please visit the site http://www.bcae1.com

This site will give you basic information on hooking up speakers and amps, as well as teach you basic electronic principles vital to proper car audio setup. You'll learn a lot and be able to make your car audio experience much easier and sound much better.

Good luck

Oh, one more thing. Why do you have 4 6x9s in the back? Bridged? If they are 4 ohms each, you just put a 1 ohm load on 2 bridged channels, giving each channel a half ohm load. Ouch.