Question about Cdt Audio HD-53ST Car Component System

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I have brought these speakers, when i turn the headunit up above about 3 quaters of the way they distort, they are running off a 4 channel 4ohm amp with 400watt rms but they do it with the gain on the amp turned right down. i have put the amp to high pass crossovers are installed that came with speakers. the headunit settings are all set to flat no bass etc. they sound bad when the bass kicks in. any ideas. thanks

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Make sure your ohm load is at rated for the item that is powering them. they may work better at 4 or 8 ohms if you run them together. also turn the bass down on your cd player or head unit

Posted on Apr 28, 2015

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If you run the power amp at a very low setting it makes the amp subject to noise and distortion. You want around a 60% setting.

Speakers also need to have proper loading, that is in a cabinet or enclosure that is kind of matched to them. If the amp is rated at a true 400 Watts RMS then the speakers should be at least 800 Watts as they "cheat" on those SPEAKER ratings and MANY A SPEAKER IS BLOWN AS A RESULT.

Posted on Mar 21, 2011

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How to wire a crossfire vr602 2 channel amp at 4ohm and 2ohm


I would be more worried about the amp than the speakers, those subs should handle the watts with no problem. The problem will be in the amps ability to remain working with a bridged 2 ohm load. It may not even stay on without going into protect mode with a 2 ohm load. If it does stay on then it may get really hot and shut off from the heat off of the Mosfett Transistors, or it could burn the Mosfetts from driving them too hard. Basically it's your choice, run your amp hard and gain more volume or run it with slightly less sound and have a cleaner sounding more stable amp that will stay on and have less chance of being damaged. If it's not loud enough the best thing to do is buy a different amp that better suits your needs and fits the application. In your case a 2 ohm stable Mono amp is going to be your best bet or a 4 channel amp bridged into 2 channels and run with 4 ohms on each channel. Or another exact matching amp like your 2 channel amp bridge them both and have each powering 1 of your 4 ohm subs. I used two VR mono amps to power my two 12" 4 ohm subs for a few years

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now this is the important part. The bigger the load on the amp the greater the wattage output to the speakers. This sucks the wattage out of the amp. Careful not to overload you amp. The setup above is safe for any amp. The following is for 2ohm stable amps only. The lower the ohm value 2, 4, 8 and so on, the greater the load on the amp.

connect the positive of one coil to the positive of the other. connect the negative of one coil to the other negative of the other coil. then take a wire from your bridge channel on your amp and connect the positive to the the positive on one coil and connect the negative to the negative on the same coil and you will create a 2ohm load on the amp in bridged mode.

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Yes you can,,,,,BUT the output labelling on the AMP will tell you where you can connect the 4ohms or the 8ohms....please read these labels and connect the 4ohm speakers to the 4ohm terminals, and the 8ohms to the 8ohms terminals...

If you intend to connect the 4ohm and the 8ohm speakers in parallel then the output impedance terminals you use should be the 4ohm ones.

If there is no labelling showing any 4ohm output terminals then its best if you dont use the 4ohm speakers at all....just connect the 8ohm to the 8ohm terminals...you dont mention any crossover networks inside the speaker boxes or if you have tweeter speakers... so just stick to the basics above at present....

Cheers From YUBEUT

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