hey guys i have a question about my crossovers and ive drawn a little (awesome) picture, basically i want to know which one of the 3 negative ports..(6bd, 3db, 0db) i should i should use and why are there three and what do they mean

thanx

They are usually the tweeter attenuation. I would start with the 0db and work your way from there, use whichever sounds best, usually if u have dash mounted tweets you may want to drop the level a tad. If they are in the kicks you may want to raise it a tad.

Change them listen, if you cant hear anything leave it at 0db

Strange that they only let you attenuate the tweeter in +db, usually they are +2, 0, -2db or 0, -2, -4db. You must have focals or something :D

Strange that they only let you attenuate the tweeter in +db, usually they are +2, 0, -2db or 0, -2, -4db. You must have focals or something :D
they are soundstream and yeah tim, the fronts are dash mounted and are abit over-powering, so is 3db quieter than 0

lol sorry dude. Yeah 0db is neutral, 3db is +3db etc... so it is louder

Nooooooooo!!!!! Yes you are right in saying +3dB, +6dB is louder, but passive crossovers don't work like that...

A passive crossover can only possibly LOWER the dB level..., so the 3dB and 6dB on the passive crossover is refering to a 3dB cut (-3dB), and a 6dB cut (- 6dB)...

I'd definately use some attenuation if you plan to use the tweets on the dash, as it will reflect of the glass and sound harsh if left at the 0dB setting...

Predominantlty, the 0 dB setting is usually intended for a reasonably flat response from the driver in a broad range of applications in off-axis setups, or an on-axis setup from a further distance than the norm, free from reflections....

The -3dB helps combat problematic reflections causing a harsh response, as well as setups which have the tweeter mounted in a location that's closer to the listener than the mibass.

The -6dB setting would be for an even smoother response, also aiming at helping the tweeter blend into the soundstage, as well as enabling the midbass to play at higher amplitudes without listener fatigue...

Of course, these are my personal opinions only, and can only really be considered as a guide..

Please explain why my bro's HSK have -2db, 0db and +2db?

How they do it is through adding more resistance. In his xover it has the following:
1ohm = +2db
2.7ohm = 0db
4.7ohm = -2db.

It doesn't make it louder, but more a comparison between the woofer and tweeter. Sorry should have mentioned that :D

My old Boston splits are the same, they have 0db, 2db, 4db.

It doesn't make it louder, but more a comparison between the woofer and tweeter. Sorry should have mentioned that :D

My old Boston splits are the same, they have 0db, 2db, 4db.

HeeHeeeHeee... Always takes an a$$hole like me to catch ppl up on a technical error. lol

Yeah, your right in the above statement... The tweeter that is used (in the bostons anyway) has a natural tendancy to be 4dB higher than the mid, due to the characteristics of the tweeter in comparison to the midwoofer with respect to thier efficiency.

So.. the mid is (for eg.) say 92dB/W/M, and the tweeter is more efficient being 96dB/W/M. The crossover settings try to simplify the "tweeking" process by displaying the efficiency relationship of the mid to the tweeter, as opposed to the amount of "filter attenuation".

That would mean that (using the above eg.) a tweeter setting of +4dB would equate to no filtering, a tweeter setting of +2 would equate to 2dB tweeter attenuation, and a 0dB setting is actually a 4dB attenuation on the tweeter.

The focals (well the K2 series anyways) use a tweeter that is around 4dB more efficient than the midwoofer. The crossover has got +2dB, 0dB, -2dB, and -4dB... What you don't immediatley notice until closer inspection of the crossover unit is that the tweeter is attenuated 2dB by a ceramic 1ohm resistor even before it reaches the filter switching network. So the 0dB setting is actually attenuating the tweeter by 4dBs.

http://www.lavendergreenooaks.com/BEN/bostonZ6crossover.jpg

Boston Z6 crossover...

pffft its good that you did otherwise there may have been some people thinking there xover has like a booster or something in it for there tweeters :bowrofl:

Overboost anyone?? :D

Stock passives suck majorly. Just go active, and pick the exact amount of DB you wanna lower the tweeter :)

So if I understand correctly. A dash or delta pillar mounted tweeter would be best put on, if you have a crossover that has the following settings -2db, 0db and +2db, on the -2db setting?
As this is the least harsh setting?
And would it matter much if you would mount it either on the delta pillar or dash?