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306 Posts
Hey, I have a Kenwood KDCX911. It's 1.5 yrs old, but my unit has some of the same settings and my experience is that the internal crossover, bass boost, etc... suck. From what I've done in car stereo and seen on the competition scene, no one on the competition circuit uses the internal crossover, they always use external, either on the amp or as seperate piece.

I compared the crossover on my head unit versus the ones on my amps and I noticed that the sound was not as clean. Now that may all be perception because I didn't have an RTA to use to concur with my ears.

To that end, I can only describe the high/low crossover questions, as for the other 2 features. They sound like they are bass "enhancers". In my opinion, I wouldn't use them. To me, they "muddy" the bass, but that's just me. Everyone likes different things.

However, a quick education on sound and frequencies is in order(someone correct me if I'm wrong)--I'm also going to try and keep this really simple. Humans car hear in the fuequency range of 20HZ all the way up to 20,000HZ. Anything below 20HZ and you won't hear it, probably feel it, and anything above 20K and you won't hear it. But dogs can :).

The lower the frequency, the lower the bass, the higher the frequency, the more "treble" you'll get. It get's more technical than that, but for this explanation, you won't need it.

Now, on to the explanation of your settings:

Bass can be 60/70/80/100 Hz

What this setting does is to set the lowpass crossover point for your sub. What that means in English is that what ever number you set it to, all sound above that number will be filtered out.

This setting is used in conjunction with a specifice output on your head unit. i.e. either a set of RCA's marked subwoofer or non-fading output

The lower you set the number, the lower your crossover point.

So if you set it at 60, then all frequencies above 60HZ will be filtered out. My recommendation is that you set it to 80 or 100 (and realistically, I'd set it at 80--this is where mine is set)

Here is my explanation: If you set it to anything below 80, what you'll get is all the low bass and miss out on some of the higher bass. What that will also do, is to make the sub sound like it is not putting out enough volume. Play with the setting, and you'll see what I mean.

Anything higher than 80/100 and the bass will sound muddy or boomy. At about 120, what you'll get is some of the "boomy" sounds coming out of your sub--and quite possibly voices. I don't know if you've ever heard this or not, but when you listen to your AM/FM part of the radio and the announcer has a really deep voice, the deep part of his voice could show up in your sub and it'll sound like crap.

Also, where you put this setting will depend on where you set your "high pass" filter to. If you set this too low, and your lowpass too high, you could have a "hole" in your frequency range. Which leads me to the next point:

Treble to be 10.0/12.5/15.0/17.5 Khz

This is kind of like the lowpass setting. The difference is that this setting will filter out all frequencies below a certain number. In this case, 10K being the lowest and 17.5K being the highest.

You want to to always match your highest lowpass setting with your lowest highpass setting. In some systems, people use a 3 way crossover to seperate their sound. i.e. one setting for sub bass, something for the middle, and then another setting for the high range. The reason you want to do this is so that you don't have any "holes" in your sound. i.e. you have the entire 20 - 20K frequency range in your sound.

Are you sure the numbers that you've provided are accurate? The treble settings seem kind of high. Actually, really high. If you use the settings as they come here, you'll have a HUGE gaping hole in your sound.

I say this because, according to your numbers, the lowpass's highest setting is 100HZ, and the lowest highpass settting is 10K. That means that if you use these settings at their respective maximums, you'll have a hole in your sound from 100HZ through 10K. NOT good, and it'll probably sound like crap.

Your high pass settings should probably go all the way down to 80 and 100HZ to "match" your lowpass settings. Verify this. If your numbers are good, then DO NOT use the highpass setting, run your mids/highs in "full range".

In my system, I am using a crossover module on my amp. I have a Kicker ZR240 with a crossover module installed. My crossover is set at 80HZ with a 6db rollover (this is complicated and can go into that later, e-mail me). On my mids/highs, I am running my amp "full range". This means that I have no crossover running, just running the entire frequency range to my speaker.

I like this setup. I have ZERO distortion at a reasonable volume and the sound is terrific. I used to have my mids/highs crossed over at 80 HZ but I didn't like the sound so I started running it full range. This isn't highly recommended because you do run the risk of blowing your speakers with the lower frequencies, but I've not any problems so far and I"ve been running this way for 2 yrs now.

Anyway, sorry for the long post, and I hope I haven't confused you. If you have more questions, post here or e-mail me at [email protected]

306 Posts
Do you plan on competing in car audio? If not, then I would recommend that you play with those other settings to get to a sound that YOU like. I say this because ultimately, it's you that listens to it and have you live with it :).

Personally, I like my system the way it sounds without any equilization, but to each his own :cool:

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