filter values

hello everybody
i am very interested in the filter setup and values that you use and with the
Oris Reference Ultra
i am playing with it and i think it is very room dependend
and taste of course
the filter that i have now is
input 2,5k/1,5uf/3k/0,39uf/pot100k out
but thats only at this moment, i wil try different values
what it jour favorite filter??

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Hey robert
Filters is a subject that needs more open discussion here.
I'm pretty close to what Bert has suggested, except I have two different filters on either side, the first resistor values are different and I think the second cap also differs. got to fix this. its been about 18 months with the BD3/200/BD15, and if this photo shows up, you can see my very first attempt at the filter, actually works good now, so no big impetus to make changes
rodney

http://basaudio.net/diyhosting/rodneyseth/slides/index_004.html

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thanks Rodney
that looks very nice i see a double 2a3 and a 45 tube wich tube do you prefer?
what are the valeus in the filters ?
and is there a side that sounds and integrate better ?

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Hi Robert
the 45 tube SET on the MD3/Oris is very musical, recently with Mundorf 3.3uF silver and oil output coupling caps...luscious...Despite my filter disparities, both channels are well integrated, seemless between Oris and BD15. one filter has a 0.47 cap in second position, and the other filter has a 0.080uF. first R is 1.8k and 2.0 respectively.
The push-pull 2A3 amp drives the BD15. listening to Charlie Haden on bass, Paul Motion on piano,Paul Bley on drums..The Montreal Tapes
r

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Hi Robert,

I know the feeling of limited responses from other Oris owners out there...

I will soon make some real-time acoustical measurements showing the differences when changing values. This should give you something to look at when you work on the filter.

Hold in there, help is on the way!

Ciao,

Bert

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Hi Robert,

I know the feeling of limited responses from other Oris owners out
there...

I will soon make some real-time acoustical measurements showing the
differences when changing values. This should give you something to look
at when you work on the filter.

Hold in there, help is on the way!

Ciao,

Bert

thanks Bert
i think that wil make it more easy
and i can see then what i am doing
where is everybody ???
this is a very interesting topic!
its the only thing that one can do with the Oris the rest is perfect.
fine tuning is very important

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I am working with this Second Order Low Pass filter but I overlap the 'reference' BD15s with Hedlunds so figures are not really relevant to you.
This is my take on tuning the filter - I'm sure Bert will correct any errors as I am no expert.

Have a look at this link http://www.t-linespeakers.org/tech/filters/passiveHLxo.html

Turning to the Second Order Lowpass filter, construct this with the values that Bert supplies. The first R1/C1 section gives you the notional crossover frequency. Mine with 1K2 and 2.7uF calculates at about 50Hz. Leave R1 alone and adjust C1. Highering C1 lowers the frequency.

Now move to the second stage where R2 and C2 set the filter slope which is the amount of overlap with the FR driver. Leave R2 alone and adjust C2. Highering C2 lowers the overlap.

Hope this helps to clarify.

Cheers Chris

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Hi Chris,

Thanks for the link.

I am working with this Second Order Low Pass filter but I overlap the
'reference' BD15s with Hedlunds so figures are not really relevant to
you.

I've been curious why Bert and others don't use 3rd order LPF which produces in-phase operation.
I'm about to add a simple R/C, 4.7k/15n by this the simulation shows all most the same curve adding only the 3rd order.

Kohjin

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Hi Kohjin,

I've been curious why Bert and others don't use 3rd order LPF which
produces in-phase operation.

I've been always curious why people rely more on theory and simulations than listening to what they hear... although, you never know if things improve.

So, do try and if it sounds better then report back.

Ciao,

Bert

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o no!!! more components :swoon:
first the simpel filter its not easy to get this one right
and i can not have more components
i heard the second order filter at Berts place
and it was just amazing very very fine and good sound the best i ever heard!!
i now this is the right way but the values don't work in my room.

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Hi again,

I'm about to add a simple R/C, 4.7k/15n by this the simulation shows all
most the same curve adding only the 3rd order.

Same curve but what about the change of phase around the crossover frequency range? In simulations you will have to use all data as input. Not just the electrical parts of the filter.

With all respect, here is some more info about loudspeakers:

In the bass there is more happening then just thinking that it simulates like a simple resistor without any phase and time changes.

A reflex port or just a simple impedance peak already changes the phase (time) of the acoustical signal, the coil of the driver works like a coil (not like a resistor), adding a horn in front of the bass driver changes the phase, the placement of the driver (time or acoustical phase)....

With the Oris systems you're filtering at frequencies where the mentioned acoustical behaviour is certainly not behaving like a simple resistor so if you don't add this specific data to the simulation then all calculations or results are useless.

I won't explain too deeply about the specific behaviour of bass systems, in general this data will always be different depending of the room and placement in that room.

Don't theorize too much. Play with values as I usally suggest and listen if these changes make it better in your room.

Ciao,

Bert

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hello everybody
i am very interested in the filter setup and values that you use and with
the
Oris Reference Ultra
i am playing with it and i think it is very room dependend
and taste of course
the filter that i have now is
input 2,5k/1,5uf/3k/0,39uf/pot100k out
but thats only at this moment, i wil try different values
what it jour favorite filter??

Hi everyone, I have been using so far a first order filter
with a system bass BD30 / AER.
I do not like too much the overlap with the fullrange
- sounds cloudy-muddy - moreover the woofer goes too high
where i want to hear the set amp and that creates a + in db
where the two speakers overlap (a minus if i reverse the
phase of the BD30).
So far I got something rather balanced by multiplying by 2 the resistor
value in the original filter (that Bert sent me). I think that it just decreases the Xover freq by 2.
- sorry Bert I just do not remember the value of the capa -
Since all of you are using 2nd order filter I am starting thinking that
the adjunction of a R2/C2 stage might be the way of removing the upper sounds from the woofer that is moreover out of phase, with a sharpest slope.

My questions to the knowledgeable assembly:
1/ Would anyone give me some starting values for a "second
order" filter?
2/ Is there any sonic interest in using good components
(capa and resitor)

Thanks,
cheers.
Vincent

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