I have Sony cdx-gt525U head unit. Which are the best component speakers work with this unit without Amp or amp is necessary?
Vibe EDGE 6"
Focal Performance R-165 S2
JBL-CS-760CSI
or any other? Please inform me

 

Sivan, selecting speakers is very subjective in what is the best speaker. Doing car install and design for more years than I care to admit to, the best advice I can tell you is to go to a local stereo store that sells all of the speakers that you are looking for. Bring in some music like what you normally listen to. Using the same head unit (brand or model doesn't really matter), play all 3 sets of speakers, standing in the same relative spot as it relates to where the speakers are mounted (centered between the speakers, say 3 meters back). You will hear a difference between the speakers (some will be more tinny sounding or may lack bass or not have a good mid range, etc). Once you know the manufacturer, picking the size is easy. From there, you need to know the RMS (not peak) power output of the radio. You want the speaker that has a power rating that is somewhere between 1X and 2X the output of the radio. This will not allow the radio to overpower the speaker and damage it while keeping the speaker free enough to be able to reproduce the sound adequately at lower volumes (higher wattage speakers tend to have stiffer cones which causes more power to be needed just to make the speaker move).

Another rating that I tend to look at is the "sensitivity" rating of the speakers. In short, this is a measure of how much sound the speaker can make for each watt of power input. The higher the number, the more sound the speaker is going to make for a given amount of power being inputted. As you look at speaker ratings, the higher the rated power of the speaker, the lower the sensitivity is going to be.

Not to add confusion to things, but you can't just go off of a manufacturer and a speaker size. They are continually making changes to the design and this results in differences in speakers year to year. So, what is a good speaker one year may not be the next. Focal and JBL tend to make quality speakers and just going off of a name, you probably will not go wrong. But this is where a stereo store with 10 different manufacturers is going to be your best bet as you can listen to all the different manufacturers and see what sounds best to you. What sounds good to me may sound like crap to you.

Granted, i have also figured out how to match up various speakers to get a surround sound effect inside of vehicles. It takes a careful ear when in the stores, but if you know what to listen for, with proper balancing of the radio, you can get some pretty neat effects going on. I used to have a car with a pretty high end system that I could get a guitarist off to either side of me, the drummer in front of me and the lead singer behind me. Used to make people wonder what kind of system I had in my car. But, it was all in selecting the components that work well with each other.

As for amp or no amp, really that comes down to how loud do you need the stereo to be. Most radios will be able to output enough power that with quality speakers, will result in your ears ringing (ie, starting to cause hearing damage). But, for some, this is not enough and they must have more power than that (guilty as charged). Granted, I found that a 300W RMS (35W to each corner and 150 W to the sub(s)) system was more than enough power to make it so you could not talk with the person in the passenger seat at full volume.

Like I have mentioned a few times, I am talking only in RMS power. Think of this as average or long term power. Many components can make an extremely loud sound for a very short period of power. This is great if you are wanting just a rim shot from a snare and then waiting a second before you get the next rim shot. Last time I checked, music goes continuously. So, peak power (ie, the quick rim shot sound) is a useless rating other than convincing a customer that they are getting a ton of power for some small price. Peak power is all a marketing ploy.