component speaker distortion

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jdubicki

Copper - Posts: 58

Joined: April 11, 2008

Location: Texas, United States

Posted: April 09, 2009 at 10:31 AM / IP Logged

I have a JVC KD-R300 head unit. I wanted to hook up an old pair of MTX Thunder 6000 Convertibles to see if the still worked. Using the crossover I hooked everything up and powered on. The speakers worked but when I turned the volume up to around 30 (it maxes out at 50) both the mid and tweeter stated playing distorted and scratchy. Are the components ruined, or am I just not feeding them enough power. I will run them off an amp at 35 watts x 4 if I do put them in, but if their busted why bother. That would mean removing the door panel (again) for no reason. The rest of the speaker specs are:

Power Handling: 50w RMS/100w total

Sensitivity: 86db

2005 Honda Accord DX

DYohn

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Joined: April 22, 2003

Location: Arizona, United States

Posted: April 09, 2009 at 6:45 PM / IP Logged

I would blame the sound on clipping the HU amps before I blamed the speakers.

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icearrow6

Copper - Posts: 497

Joined: February 02, 2009

Location: California, United States

Posted: April 09, 2009 at 7:26 PM / IP Logged

The Stereo has a built in crossover. But yeah you will get better sound with the amp anyways. KD-R300 ? is the one that changes colors right? if you hold the "menu" key for 2 secs you'll get to the settings, up the HPF to lose some of the distortion.

Velocity Motors

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Joined: March 08, 2002

Location: Manitoba, Canada

Posted: April 09, 2009 at 10:39 PM / IP Logged

DYhon is right, the HU is clipping the speakers. Use an amp that has at least the RMS of the speakers and you should be fine

Jeff

Velocity Custom Home Theater

Mobile Audio/Video Specialist

Morden, Manitoba CANADA

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jdubicki

Copper - Posts: 58

Joined: April 11, 2008

Location: Texas, United States

Posted: April 10, 2009 at 7:40 AM / IP Logged

Thanks for the replies guys. I thought it was the head unit amp as well just not being powerful enough. Just to cure my curiosity, is it because the sensitivity rating is so low? Right now I have some Infinity Reference 6.5's and Alpine (not sure what model) 6x9's hooked up to the head unit and the play louder. The sensitivity ratings on those are above 90db. I was just wondering. I'm so glad the the components arn't toasted cause I'd like to put them back in. component speaker distortion -- posted image.

component speaker distortion -- posted image.

2005 Honda Accord DX

DYohn

Moderator - Posts: 10,741

Joined: April 22, 2003

Location: Arizona, United States

Posted: April 10, 2009 at 9:22 AM / IP Logged

jdubicki wrote:

No it has nothing to do with sensitivity. All that means is the rated average output with one watt of input at 1KHz (usually.) Clipping is because of low power low quality amplifier chips inside the head unit.

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Velocity Motors

Moderator - Posts: 12,488

Joined: March 08, 2002

Location: Manitoba, Canada

Posted: April 10, 2009 at 10:11 AM / IP Logged

This is taken from www.ofsoundmind.com:

< color=#ff0000>What kills speakers? The answer: Overpowering.

Let me explain. A radio, of any size is simply taking information, be it from the radio waves, a cassette tape or the D/A converter of a CD player, Minidisc or DAT, and then proceeds to amplify this signals voltage and current levels to a point where it will cause a speaker to move. In a typical in-dash CD player, there is a small Integrated Circuit which does all the final amplification (after volume, bass, treble, etc.). The best of these chips make a real world 13-18 Watts of true properly rated power. Any claims beyond that contain high levels of distortion, noise, and are in a limited frequency range.
We call upon our CD player to drive 4 or so speakers in a car. Each should get this max of 13 or so watts before distortion sets in. Lets look carefully at this distortion.
< color=#ff0000>CLIPPING
Clipping is the result of asking an amplifier to try and amplify a signal to a point higher than it is capable of. We know speakers move back and forth. The amount by which they move is determined by how much voltage we apply to the speakers voice coil. If we can't increase the voltage, then the speaker will move no further. The problem is that which we are listening to music and suddenly a deep bass line kicks in, the speakers are asked to move much further to reproduce these low frequencies. All amplifiers have a maximum output voltage (one positive, one negative). An amplifier can not put out more than this voltage. Any signal that tries to go beyond this voltage level simply stops there. The output voltage stays at the maximum until it drops back into the standard operating range. The motion of a speaker cone attempts to follow the output voltage of an amplifier. Once the speaker has extended to the point that equates to the maximum output voltage of the amp, it will go no further. The speaker cone sits still until the output voltage comes back into the operating range of the amp.

Jeff

Velocity Custom Home Theater

Mobile Audio/Video Specialist

Morden, Manitoba CANADA

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component speaker distortion

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