question about 4 channel amps

[jaygeorge1979 10+ year member]

heeeey fellas

a buddy of mine has a 4 channel kenwood amp (which has two diffferent inputs, A and B).....he is running his 2 subs off 2 of the channels (actually, they are wired together, bridged off of two of the channels) and he is running speakers in the car off of the other two channels...he just has two speakers hooked up to each channel...its a slightly older kenwood amp

i had never really thought someone could run subs AND regular coax speakers off of one amplifier....since there are two inputs, A and B, are the two impedences completely seperate of one another? for exampe if the two A chanels produce, say, 200 watts bridged @ 4 ohms (which is how the subs are configured) and each of the B channels is seeing a two ohm load (two 4 ohm coax speakers in parallel) wouldnt that also mean that each of those 4 speakers is seeing 100 watts? it seems to me that 100 watts for an average dash coax speaker should be too much, while 200 watts for a pair of decent subs is too little...how is this all working together and still performing efficiently? since i think there is only one knob to adjust the gain, wouldnt you be inable to adjust the subs and speakers seperately?

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[Bake 10+ year member]

You are correct that each channel will respond to the load placed on it reguardless of what the other channels are doing. 100 watts for the coaxes probably isn't too much and there are subs that will do fine on a couple hundred watts. I have heard plenty of systems with only a few hundred watts total that sounded great. The PG four channel that I had set up like that had independent gains for each pair of channels. It was easy to match the levels for subs and components. With only one gain control it may be more difficult to even eveything out but you could use the fader on the head unit to do it.

 

[jaygeorge1979 10+ year member]

thanks for the reply bake...for some reason, i always figured you have two seperate amps, one for components and one for subs...didnt really it could allll be taken care of with a simple 4 channel amp //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[954runner 10+ year member]

the install i did on my friend's car used a four channel amp. its actually VERY loud, VERY clean, and VERY inexpensive. if you can get one that satisfies a sub and some comps just right, i think it will sound very well.