Polk Audio DB6500

MacLeod

98thumpin wrote:

you all said that the tweeters were to high but on this website polk audio says the higher the better.

Two different things. It is better for a tweeter to be able to reproduce higher frequencies. A speakers response is kinda like a curve, so say a tweeter can reproduce 15 KHz, that means itll start fading around say 8 KHz and continue dropping off until it reaches 15 KHz, thats called a roll off. Most people cant hear anything above 18 KHz (+/-) so if a tweeter's response goes all the way to 30 KHz, that means that its natural roll off will be beyond your hearing and so the tweeter will have a much flatter response curve which is what you want. You dont want 10 KHZ to be louder than 15 KHz. So in this case, higher is better.

What we're talking about is overall harshness of the sound which also includes the midrange. Take the Infinitys, those things make Rush's Test For Echo CD sound like the guitar player is playing a kazoo and the guitar solos are very screechy. Now the Polk SR's are smooth as silk with a warmer overall sound to them and the guitar is now much fatter sounding.

Did that make sense? I am horible at explaining these things.

1996blackmax

You made perfect sense Mac .

By the way the tweets on my system are very smooooth as well . My Rainbow components now sound even better. I've had them in there for a few weeks now, and they are pretty much broken in. Looking for any excuse to go driving now .

98thumpin

true true

cam5860

I have always wanted to hear how a set of focals sound.

1996blackmax

I have...

I am still very happy with my choice

98thumpin

some one told me about eye level for the tweets and where i sit thats about in the middle of the a pillar.

1996blackmax

Have you played around with different locations for the tweeter? I just re-read the manual for my speakers, and it said that if the tweeters are too far apart from the mid it may create a void in the frequency response. Sometimes this may be alleviated by reversing the phase on the tweeter.

The thing is that if it sounds good to you, that is all that matters.

98thumpin

yeah thats true what is meant by reversing the phase?

1996blackmax

You just connect the (+) wire of the tweeter to the (-) terminal of the crossover, and the (-) wire of the tweeter to the (+) terminal of the crossover.

98thumpin

oh really thats pretty simple but cant that mess them up some i dont know anything about that.

MacLeod

Having speakers out of phase wont hurt anything other than your SQ. It can cause some issues with cancellation and some imaging issues but it wont hurt any of your components. It can also be used to improve your SQ sometimes, like wiring the drivers midrange out of phase to pull the center image off the door and things like that. However, Ive never found this to help so all my stuff stays in phase. But it wouldnt be a bad idea to experiment with it some, you might find a combination that sounds better to you.

98thumpin

ok thats cool. ive decided to go with thw mmc650, and the mmc690 speakers instead of the components just beaucause when i get rid of the car i dont want any holes in the a pillars, unless i just leave the tweeters in the car and get new tweeters. what do you think. about the mmc speakers?

1996blackmax

I have read test reports when the components are quite a distance apart where this causes a dip in the sound. Switching the phase on the tweeters actually alleviated that issue. You will have to play around with the settings to see what works best for you.

I know what Mac is talking about, but I was talking about just the tweeters being reversed.

98thumpin

98thumpin wrote:

ok thats cool. ive decided to go with thw mmc650, and the mmc690 speakers instead of the components just beaucause when i get rid of the car i dont want any holes in the a pillars, unless i just leave the tweeters in the car and get new tweeters. what do you think. about the mmc speakers?

so what do you think about the mmc speakers

MacLeod

Cant beat em for the money.

cam5860

Hey mac have you got a picture of your tweeter install? I just want to get a idea of where the stage should be at.

MacLeod

Here ya go! Post #71.

I dont have a digital camera anymore so these are all I can get ya.

cam5860

I gotcha you have them mounted at the bottom of the A pillars. The only problem is it's going to be hard for me to put mine there because of the way my A pillars are made.

They don't have a flat surface. I would put them by the door handles in the door panel but they will not be in line with mids. They will be offset.

1996blackmax

I had to go with the doors as this offered the best mounting location, as well as good sound. Had these darn things come with a surface mounting cup they would have gone on my window sales. Rainbow makes great speakers, just not great mounting hardware, at least not for my set . I had to glue the cups to the door as they did not even give me that metal bracket thing that holds it in place. The sound they produce more than makes up for it though .

98thumpin

looks good .to me clean install

MacLeod

Ya know Max, that is an excellent install. That looks factory. Well done my brother!

1996blackmax

Thanks guys .

cam5860

I will take the DB components over momo coaxials anyday. The momo coaxials sound good but the DB components are much clearer.

The tweeters sound a hell of a lot better. Now where you will hear the difference is with the momo component set. Now that sounds better than the DB series.

MacLeod

The Momo coaxials have both a better midrange and tweeter. They also have the same crossover network that the DB's have.

The DB's do have the advantage of being able to mount the tweeter better.

And there is no more cleaner or detailed speaker than the Momos!

cam5860

But at the same time a lot of things factor in on how good a set of speakers will sound. Just about any set of speakers are going to sound good on a C400.4.

MacLeod

I think we're in the wrong thread Cam! LMAO!!!

I thought something looked weird!

cam5860

Yeah I agree Mac no doubt the momo's are built better. The mid woofer is much better than the DB mid woofer.

But far as the tweeter the only difference in the momo tweeter and the DB tweeter is on the momo tweeter you can swivel it 15 degree's for better imaging.

cam5860

LOL yeah I just noticed we have two threads fussing about the same freakin stuff.:D

MacLeod

cam5860 wrote:

But far as the tweeter the only difference in the momo tweeter and the DB tweeter is on the momo tweeter you can swivel it 15 degree's for better imaging.

But its a better tweeter!

Maybe Im biased because I had my MMC690's for a long time and absolutely loved them. I seriously thought about just buying a set of Momo tweeters and keeping the 6x9's to use as midrange.