L-R 12db/oct tweeters reversed or not?

[tinitus]

your impedances will be very low
and not match crossover at all
big problem

 

[balerit]

I have never experienced any 2way that shouldn't have reversed tweeter
with 3ways, it's always been reversed midrange
that said, I haver never owned or built any speaker without some kind driver offset
or else I would most likely tilt the whole speaker backwards

2-way second order filter, tweeter reversed. 3-way second order, tweeter normal midrange reversed.

 

[oszkar]

ok! Thanks allot!

 

[tinitus]

then I guess all my speakers must have had 2.order crossovers

 

[tvrgeek]

MEASURE. If you have a big notch at the crossover, then you need to switch it. This is the only sure way as the one rule if speakers is "in depends"

 

[oszkar]

So that crossover of the BRAUN L630 will work with theese drivers?! they are al 63V, that should cover it of what i know... No?!

 

[oszkar]

I mean, the caps are 63v!

 

[tinitus]

if you already have all those parts from whoknowswhere, try it
with mid drivers i series
and tweeters in series
woofers...? maybe better in paralel

but I would not recommend to buy anything to do this

 

[oszkar]

I want to make a replica of the original crossovers with cut frequencies at 1500 and 8000hz! I do not know where every thing is placed, and I would have put into them a ceramic resistor and tweeter protection aswell a PTC i would say!

 

[oszkar]

If anyone can help me with a drawing of how everything is placed, values I would apreciate it! 2nd order 3 way!

 

[Deep Throat]

There is no second order Linkwitz-Riley.
Deep Throat

 

[tinitus]

There is no second order Linkwitz-Riley.

no, so they say
I think it's originally 'transformed' from Bessel filter function
this can be handled in passive crossovers
maybe why they say it's really more like 8 or 10db than it is 12db
but will you notice the difference on a graph

but active 12db 'L/R' crossover .... yes could mean trouble
has to be 'compensated', or it could have unintentional peak in xo point

but I clearly remember a very skilled man saying....'what does it matter I don't know anything about BSC when I use measurements'
I shall not tell who said that

 

[oszkar]

HW 3/120 NG - 8 Ohm will theese work?

 

[balerit]

There is no second order Linkwitz-Riley.
Deep Throat

You got to be kidding, right!

 

[dumptruck]

L-R 12db/oct tweeters reversed or not?

Correct.

Now that I have definitively answered the six-year-old question, oszkar, please start your own thread.

 

[tvrgeek]

The L/R crossover is defined as the cascading of two second order Butterworth filters. By definition, it is 4th order. Period. Now, one can use the idea of spreading the centers and higher Q to any order filter if it works for them. Technically, the crossovers I have built that try and approximate an L/R crossover by incorporating the driver natural rolloff are not L/R crossovers. One does not have the ability to control the Q. They are "inspired by" the gentlemen.

 

[oszkar]

Threading

Ok! How do I open a new thread! I was lookint for the past 5 minutes! Thanx!

 

[tinitus]

HW 3/120 NG - 8 Ohm will theese work?

Ok! How do I open a new thread! I was lookint for the past 5 minutes! Thanx!

go to main menu, and where you want it, then top left you see 'New Thread'


moderation

 

[charlesp210]

There is no second order Linkwitz-Riley.
Deep Throat

LR2 is a well known crossover, and described by Linkwitz himself:

Crossovers

4) - 2nd order Linkwitz-Riley filter (12 dB/oct, LR2)

I believe I have seen it described in earlier writings by Linkwitz as well, along with LR4, LR6, LR8. And other authors in JAES 1979-1989. When the order is divisible by 4 the polarity of both drivers is the same, otherwise the polarity of one side must be inverted.

I'm not exactly sure what the formal definition of LR crossover is, I think a cascade of 2 maximally flat filters or cascade of 2 filters having Q of 0.707. NOT only a cascade of 2 second order butterworth.