Crossovers needed?
 

:icon_shrug:On my son's 1998 Blazer LS 4 Door 4WD he has factory tweeters in the dash, 6 1/2" speakers in the front doors and about the same size in the rear doors. (I have included pictures of the front & rear speakers). My question is : Does this mean that the original Delco HU has "built-in" crossovers because I want to replace all six speakers but am confused by the need to add external crossovers if I go with components. The tweeters are 4 ohm, the fronts are 4 ohm and the rears are 9.5 ohm by the way. I just want to get some sound in the vehicle - not looking for anything fancy but in the front 2 sets of 2-ways might be just as expensive as 1 set of components. I'd also like to keep the install as simple as possible so I didn't want to replace the HU or do any more wiring than I have to. Any suggestions/hints would be greatly appreciated.:icon_shrug:

Attachment 736

Attachment 737

Attachment 740

Attachment 741

Attachment 742

It probably does not have a built in crossover. Most OEM speaker systems have a capacitor in line with the tweeter (majority right at the tweeter) to filter out the lower frequencies. This is called a passive crossover, it's quite simple to do, just get a value of capacitor to achieve the freq. you want. I can't recall the formula, but readily available by searching the net.

*EDIT*

If you really wanted to, you could use the caps that are on the factory tweeters to get the same sound from the aftermarkets. Although, if you buy a component set most come with passive crossover, so you would be set either way.

Thanks for the info
 

O.K., thanks midnight. That is good to know. Based on that info and my current budget I decided to go with speakers in the front & rear doors only for now and see how that sounds first. Thanks again.