X-over points on PA amps???

Vital

Anyone know exact x-over points on PA amps??

FLAT is obvious
LPF - i'm assuming would be somewhere in 250-500Hz area
HPF - ???

arun1963

LP / HP depends on what you have connected to the channels. For a sub you would LP and for a mid you'd HP. Typically, this xover point is in the 40-80hz range. If you set it at the hu you can either bypass at the amps or set it at the same point as on the hu.

kawizx9r

arun1963 wrote: »

If you set it at the hu you can either bypass at the amps or set it at the same point as on the hu.

This would be a bad thing when applied to home theater, the same wouldn't be said for car audio?

I've heard some nasty 'humps' in the frequency range when both a sub's crossover and processor's crossover were both being used to filter out frequencies at the same time. It's usually one or the other that's being used.

I haven't done that for car audio though so correct me if I'm wrong. I just like to use the one on my amp since I can dial it precisely where I want it at.

arun1963

kawizx9r wrote: »

I've heard some nasty 'humps' in the frequency range when both a sub's crossover and processor's crossover were both being used to filter out frequencies at the same time. It's usually one or the other that's being used.

Yes and no. Will come back to this tmrw morn. It's 2 am here.

Vital

Just spoke to Briana who prosimed to find out on exact cut-off points and call me back. I'll keep u guys posted.

btw - while i was on hold they had Queen's "We are the champions" song playing which make me think of momo's "championship performace" marketing. Wonder if that was just a coincidance there

arun1963

DSkip wrote: »

Excuses excuses

:p:p

kawizx9r wrote: »

I've heard some nasty 'humps' in the frequency range when both a sub's crossover and processor's crossover were both being used

I'm not a big fan of cascading or staggered xovers. But I also know that mindsets limit your progress here. I've learnt that, far too often with car audio. I guess it's finally sunk in.

The fact is, that in a car both can be made to work and yes, while avoiding 'humps' or 'dips' in the overall sound. They would be used for different purposes and yes they would be band aids at best, but they would work.

Cascading xovers is setting them at both the hu and the amp. In a car you would do this to prevent sub localisation, since most subs in a car are behind you. Your ears locate 'source' above about 70hz. Cascading gives you the 12dbs or so of extra slope. The catch here is to set the point on the amp slightly higher than on the hu. Apologies to Dskip cause I told him the opposite in another post. Got to stop these late night posts.

Eg - you set a xover at 50hz on your hu on a 24 db slope and 70 hz will only be about 12 db down from 50hz. Typically the sub plays the 50+ range much louder than 20-40hz range.

Cascading and setting the amp to 60hz would remove the range you want eliminated anyways and its already down 12db without messing with the original slope set at the hu. The 'humps' would appear if you set the amp lower than that at the hu. That would cause a hump. You'd hear one range then a dip and then the next range.

Car audio and home audio are two very different animals. You're aiming for the same goal but the paths taken are very different.

kawizx9r

It's why I asked, and you just explained why it'd work. Thanks