Want some input from someone experienced

[xKB S10x]

Hey y'all, the other day I put in a new system in my truck. For some reason, it sounds like one of my 4x6's is making some weird sounds when I crank up the volume. It sounds like it's making a buzzing noise and is distorted at high volumes; almost like it can't handle highs.
I would like to note that I had to drill out different holes to mount them in my dash, they wouldn't line up to the original screw holes. Also I just hooked them up to the back of my head unit. I want to use my amp for my subs, which I'll install later on. It's a Crunch 1000.4 (1000 Watts.)
Did I install them wrong? Got a lemon? Need to lower highs? I don't know, but I would like some input. I doubt a brand like Hifonics would sound like this right out of the box.

My Setup:
2002 Chevrolet S10 Extended Cab
-Hifonics ZS46CX (4x6) 2-Way Speakers in the dash
-Hifonics ZS653 (6.5) 3-Way Speakers in the doors
-Sony CDX-G1200U Head Unit, 10 Band adjustable

 

[HTWillie]

I think your speakers are fine, but they aren't built to go very low, so they can be overwhelmed pretty easily with bass heavy music.

The Sony head unit has a three-setting high-pass filter. Turn this on and play with the settings to see if it cleans things up or removes the buzzing. It'll be awfully weak in the bass department, but you've got plans for subwoofers so it might be just a temporary shortcoming.

 

[loudnoises]

Depending on the speaker used, if it didn't get bolted down straight, that can cause coil rubbing and other bad behaviors.

If you unbolt the speaker from the vehicle, does it still distort? You also may need a highpass filter for them, a 4x6 shouldn't see anything under 100/80hz

 

[Ken Boyd]

Check to maker sure no metal shavings are dancing around on the cone from when you drilled the holes.

 

[HTWillie]

After checking these easy possibilities, if the troublesome sound still persists, try swapping the left and right speakers.

If the speaker is malfunctioning, it will malfunction on the other side. If the distortion or breakup remains, it's something upstream.

Does this distortion or breakup happen with all sources, (CD, mp3, FM, Bluetooth, AUX cable)?

 

[toxcrusadr]

Make sure the screws are tightened evenly, snugly but not too tight . Like lug nuts. If one is cranked down too far it can distort the metal basket, and the woofer voice coil can rub.

If it doesn't sit flat against the panel it's being mounted on, you might consider washers or better yet a gasket around the whole speaker if it doesn't have one. I use old inner tube material (free discards from a tire place) for custom gaskets.

Or, you are getting distortion from overdriving the amp.