Crossovers..

[miker 5,000+ posts]

I'm curious to what exactly they do.. I mean the only thing that I can adjust on them is some little switch for the tweeter that says "0db" or "+2db" ...

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[UCF52 10+ year member]

In short, they filter out the signal from the amp to give the mid bass/tweeter a predetermined (passive) frequency response range.

 

[jco1385 5,000+ posts]

they filter out everything but the freq the speaker can use

 

[miker 5,000+ posts]

In short, they filter out the signal from the amp to give the mid bass/tweeter a predetermined (passive) frequency response range.

What about the freq. adjustment on the amp? What do you do with that then?

 

[Thedeadly1 10+ year member]

+1 miker good question i dont know that answer either

 

[UCF52 10+ year member]

they filter out everything but the freq the speaker can use

Isn't that statement false? Or I guess it could be. I would be pretty confident in saying that most factory passive crossovers do not expose the driver(s) to their limits or very close to them. For example, let's say the factory RSd crossover sends 4k and above to the tweeter, that doesn't mean that is the limit of the tweeter. It just means that is what PG has chosen for crossover points.

What about the freq. adjustment on the amp? What do you do with that then?

If you are running passive leave the adjustment to full range... the factory passives will filter out the signal.

 

[miker 5,000+ posts]

Isn't that statement false? Or I guess it could be. I would be pretty confident in saying that most factory passive crossovers do not expose the driver(s) to their limits or very close to them. For example, let's say the factory RSd crossover sends 4k and above to the tweeter, that doesn't mean that is the limit of the tweeter. It just means that is what PG has chosen for crossover points.


If you are running passive leave the adjustment to full range... the factory passives will filter out the signal.

So full range, and what frequency? Or does the freq. adj. not matter when it's on full range?

Thanks.

 

[jco1385 5,000+ posts]

Isn't that statement false? Or I guess it could be. I would be pretty confident in saying that most factory passive crossovers do not expose the driver(s) to their limits or very close to them. For example, let's say the factory RSd crossover sends 4k and above to the tweeter, that doesn't mean that is the limit of the tweeter. It just means that is what PG has chosen for crossover points.


If you are running passive leave the adjustment to full range... the factory passives will filter out the signal.

my answer was vague, but correct. you send a 50hz signal to a tweeter and it can't use it, hence my post.

i didnt want to write a book explaining it

 

[UCF52 10+ year member]

So full range, and what frequency? Or does the freq. adj. not matter when it's on full range?
Thanks.

You can just use your HPF and leave the freq. knob as high as it will go. That's how I have mine.

 

[miker 5,000+ posts]

You can just use your HPF and leave the freq. knob as high as it will go. That's how I have mine.

I was told that the freq. on your speaker amp, and sub amp should match?

EDIT: right now I am using the HPF, and both amps are at ABOUT 80hz.

 

[helotaxi 5,000+ posts]

You need the HPF on the amp. The passive crossover typically doesn't keep the lows out of the mid, it only divides the freqs between the mid and the tweet. There is no hard and fast rule on where the filter on the amp should be set, though. Every system, car and install will need a different freq. There is no reason to set the sub amp and high amp to the same freq. In fact that will usually result in a peak in the frequency response at that point. A bit of underlap is usually best.

 

[miker 5,000+ posts]

So how it is now SHOULD be around where it should be? Just tweak it around a bit, and see how it sounds?

 

[helotaxi 5,000+ posts]

Yep.

 

[UCF52 10+ year member]

my answer was vague, but correct. you send a 50hz signal to a tweeter and it can't use it, hence my post.
i didnt want to write a book explaining it

That's what I figured. Lazy *** //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

The passive crossover typically doesn't keep the lows out of the mid, it only divides the freqs between the mid and the tweet.

Never knew that. I learn something new everyday.

 

[MiniVanMan 10+ year member]

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