Alright.. just recently bought and installed a set of the zapco i-6 component's. .. running them off a MBQuart 4125..Let me get to the problem im having..

my Volume knob can go up to 60 i believe... when i crank up the volume to say 47 my high's (the zapco components) sound as if someone put a pillow over them.. then as i turn the volume down to around 30ish it clears back up.. I at first thought maybe something internally came loose in the amp since its mounted to the box with my 18" BTL in it.. so I cut the subs out of the equation completely.. still does it at around the same volumes.. This was a problem i was having with my old 6.5" Eclipse door speakers i had before these.. I know the connections are nice and snug. I personally think the amp is a pile of garbage.. but who knows maybe something is wrong.. ground is good on that amp along with my other amp (saz1500d) all wires are ran directly to each door separately. Now i should also mention i didnt fuse that particular amp (mb quart4125).. lol ran short on fuses so this one didnt get one.. maybe my problem? hell i donno. I have a older Fosgate 600.4 in my truck im about to swap into this ones spot.. but i still would like to figure out whats goin on here, if anyone has any good idea's id appreciate it

are you running active?

still a noob with my high end.. not sure which one active is lol.. its using the crossover which comes with them. Amp + and - to crossover input, woofer and tweeter off the crossover output

still a noob with my high end.. not sure which one active is lol.. its using the crossover which comes with them. Amp + and - to crossover input, woofer and tweeter off the crossover output

Most HU's after they past the half mark they get peaker may want to check your amps tuning too. But you might need a bigger amp for those comps what HU do you have.?

amp tuning is a very good possibility, think that amp has more than enough power for these components, the deck is a pioneer premier, its very very nice.. tons and tons of settings. i dont have the model number right this minute.

amp specs..

MB Quart DSC 4125

# BRAND NEW MB Quart DSC 4125 1000W RMS, Class A/B 4-Channel Discus Series Amplifier

# Class AB Car Amplifier

# RMS Power Rating: 4 ohms: 125 watts x 4 chan.; 2 ohms: 250 watts x 4 chan.; Bridged: 4 ohms: 500 watts x 2 chan.

# PWM (Pulse Width Modulated) MOSFET power supply

# Remote bass level input (remote level control sold separately)

# LED power and protection indicators

# Tuned Bass EQ (0-9 dB bass boost at 45 Hz)

# Bridgeable operation

# Soft start sound

# Preamp RCA outputs

# DC, short, thermal, and overload protection circuitry

# Unbalanced RCA inputs

# Switchable 2-channel/4-channel input modes

# Damping Factor: >180

# Variable input level control: 0.2V-0.6V

# Variable high-pass filter (10-1200 Hz, 24 dB/octave)

# Variable low-pass filter (30-150 Hz, 24 dB/octave)

# Frequency response: 10-20000 Hz

# Dimensions: 15.75"L x 9.45"W x 2.7H

I have a Pionneer to samething happens so just browse around your amps and set your gains at like volume 30 or 32

Are you running it bridged? Can you take a pic of the settings. I have two of these. 4125 and 480. I am happy to help if I can.

hmm.. ill try that tomorrow when i get home from work. im really considering swapping this amp with my other fosgate 600.4 .. the fosgate sounds awesome in my s10, but this mb quart sounds like shit in the tahoe..

Amps don't change sound your settingS do. Amps just make power.

Sounds like power compression to be honest. Too much power = too much heat. Also known as thermal compression and a few other terms that escape me.

Your driving the speakers too damn hard. Turn your volume down.

turn the volume down? you mean the gain? these things sound like shit right now.. volume up 3/4 and there not even that noticeable. to be honest i had some cheap ass eclipse co-axial in there before these and im having trouble telling the difference.. I even added about 10 tiles from sound deadener showdown to the each door. going from a cheap 6.5 to a zapco component set i should be able to tell a difference. Its all in my settings i think.. or the amp is crap.. im gonna play with some settings i could have things wrong, i dont doubt that one bit which is why i came here with the problem. ill try to play with some settings and if all else fail's ill get a picture of my settings as they will be and hope we can go from there. appreciate everyone's response.

Are you running it bridged? Can you take a pic of the settings. I have two of these. 4125 and 480. I am happy to help if I can.

No not bridged, each door to its own channel of the amp. ill gonna play with it and if nothing else ill get a picture posted up. thanks man.