LC line level X-over

[slowmotion]

Hi all

Anyone using line level LC X-overs instead of
active X-overs ? How do you like them ?

Have tried making various op-amp and valve active filters,
but they are not for me so far.
I am using 2. order RC filters at the moment,
but want to go 3. order.

Rescaled to 600-700 ohms the inductors get pretty big.
What type of inductors to use ?

Is there any threads on this allready?


Thanks 🙂

 

[kelticwizard]

Rescaled to 600-700 ohms the inductors get pretty big.
What type of inductors to use ?

Is there any threads on this allready?


Thanks 🙂

http://www.diyaudio.com/forums/showthread.php?threadid=14449

 

[slowmotion]

Thanks kelticwizard,

I've seen the link to the T-Line site too, used the info there
when I made the RC filters for my own system

cheers 😉

 

[ThorstenL]

Koinichiwa,

Anyone using line level LC X-overs instead of
active X-overs ? How do you like them ?

Like this?

http://www.marchandelec.com/xm46.htm

Have tried making various op-amp and valve active filters,
but they are not for me so far.

I would suspect the reason actually to be simply the fact that most textbook active crossovers do not work with real world drivers, which invariably require equalisation.

It is almost impossible to correctly "activate" commercial loudspeakers using textbook active crossovers. You need to design the active crossover specifically tailored to the Speaker you are using or add an equaliser ahead of the active crossover.

Or you could just buy a good digital crossover and use that, they usually include equalisation.

Sayonara

 

[planet10]

Re: Re: LC line level X-over

Like this?

http://www.marchandelec.com/xm46.htm

Thanx for pointing that out T.

Where would one go looking for chokes for a DIY version of this beast?

dave

 

[ThorstenL]

Re: Re: Re: LC line level X-over

Koinichiwa,

Thanx for pointing that out T.

Where would one go looking for chokes for a DIY version of this beast?

dave

Hammond has pretty large value chokes in the program, otherwise it's the trusty old winding machine. Can be made from a simple sewing machine motor, speed pedal, clamping mechanism for bobbins and a resettable counter for turns....

😉

Sayonara

 

[slowmotion]

Re: Re: LC line level X-over

Hi Kuei Yang Wang

Koinichiwa,

Like this?

http://www.marchandelec.com/xm46.htm

Yes, like that 🙂
But DIY , of course

I would suspect the reason actually to be simply the fact that most textbook active crossovers do not work with real world drivers, which invariably require equalisation.

Yes, but still I like the passive line-level RC crossovers I use at the moment better than the active X-overs I've tried.

It is almost impossible to correctly "activate" commercial loudspeakers using textbook active crossovers. You need to design the active crossover specifically tailored to the Speaker you are using or add an equaliser ahead of the active crossover.

Haven't used a commercial loudspeaker since '85 or something,
I'm still having problems making good crossovers 😉

Or you could just buy a good digital crossover and use that, they usually include equalisation.

That would probably be ideal, don't have that kind of money,tho

Hammond has pretty large value chokes in the program, otherwise it's the trusty old winding machine. Can be made from a simple sewing machine motor, speed pedal, clamping mechanism for bobbins and a resettable counter for turns....

Hmm, probably the best way to do it, but what kind of core?
150-200 mH would be far to big if air-cored.

cheers

 

[ThorstenL]

Re: Re: Re: LC line level X-over

Koinichiwa,

Yes, like that 🙂
But DIY , of course

Last time I looked Marchand WAS DIY Stuff, if in a kit....

Yes, but still I like the passive line-level RC crossovers I use at the moment better than the active X-overs I've tried.

Slopes are much lower order on that if you implemented 4th order filters active....

That would probably be ideal, don't have that kind of money,tho

Well, while it has yet to materialise from Vapour ware into reality, Behringer in Germany will soon have a suitable unit:

http://www.behringer.com/02_products/prodindex.cfm?id=DCX2496&lang=ger

US retail is set at $ 440. Okay, not as cheap as some handwound chokes and a handfull of capacitors, but still hardly expensive. Similarly priced units with similar specs are available from dbx (Driverack) and LEM, to NAIM those that immediatly come to mind.

Hmm, probably the best way to do it, but what kind of core?
150-200 mH would be far to big if air-cored.

I would say Mu-Metal. But it is not easy to make chokes that have a defined inductance on these and they cost a lot of money. Not for the fainthearted. Ferrite Potcores are easier to use and have a better linearity but tend to sound not as good subjectively as a suitably designed choke with Mu-Metal or Permalloy (at least in RIAA EQ circuits I found that the case).

Sayonara

 

[slowmotion]

Hi

Slopes are much lower order on that if you implemented 4th order filters active....

Tried 2nd and 3rd order active, liked 3rd better than 2nd in my room.
Very subjective, I know.

Well, while it has yet to materialise from Vapour ware into reality, Behringer in Germany will soon have a suitable unit: http://www.behringer.com/02_product...CX2496?=ger

Thanks for the tip , I'll go have a look 🙂

I would say Mu-Metal. But it is not easy to make chokes that have a defined inductance on these and they cost a lot of money. Not for the fainthearted. Ferrite Potcores are easier to use and have a better linearity but tend to sound not as good subjectively as a suitably designed choke with Mu-Metal or Permalloy (at least in RIAA EQ circuits I found that the case).

Ok , " a lot of money" is out,😉 , I'll have a look at ferrite, then.
Thanks

cheers