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Old 9th January 2004, 12:03 AM   #91
BDP is offline BDP  United States
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Yes,
The question for me is do I need gain to equalize the drivers or if the amplifier gains are not the same. Do I want the ability to change x-over points with out effecting each of the filters. If you build another amp this kind of versitility/ adjustability would be nice.

See what happens when you build too many amps??
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Old 26th January 2004, 06:20 PM   #92
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Default My idear for an active xover

Hi all,

I have made a plan for an active xover, but I need to make sure that I have included all I need for a flexible filter.

Please see the pic and comment on it.

It's a 4 way filter using 2 global EQ's and some EQ's in sub, bass, and midrange.

Thanks for any input.

Jens
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Old 26th January 2004, 06:46 PM   #93
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Default Re: My idear for an active xover

Quote:
Originally posted by JensRasmussen
Please see the pic and comment on it.
Complete -- except maybe for time delay -- but very complex... you are going to have a little city of op-amps (or other active devices).

dave
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Old 26th January 2004, 09:55 PM   #94
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Default Delayline

Well, I hope to make a digital version when I get my hands on a DSP eval board.

Here it would be easy to make the delayline.

The transformation to DSP is not to bad once all the analog math is done.

Is it ok to use dual opamps? or even quad?

\Jens
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Old 26th January 2004, 10:41 PM   #95
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You could also add a sub-sonic filter. Your amplifier will thank you.
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Old 28th January 2004, 11:39 AM   #96
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Default SMD or normal resistors

Hi,

What would be best, SMD resistors or normal ones that need drilling?

SMD gives a smaller layout, but are difficult for most DIY folks to get. Normal resistors are alot bigger and more easy to come by.

Is there any difference in sound?

Are PP caps ok for sound?

What about OPamps, what do you prefer?

Thanks

\Jens
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Old 4th May 2004, 02:13 PM   #97
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Default 3 way stereo Active Crossover summarize

Hi,

Can anyone summarize things about building/buying active crossover of 3way-stereo (including performance and costs).

I want to upgrade my hi-end speakers (which I build and designed) with such a crossver and amps.
The crossover should have flexibility (freq, slopes, att) to support future use in other speakers design as I will want to use it for speaker designs (for my personal use).

Thanks!
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Old 4th May 2004, 02:22 PM   #98
tiroth is offline tiroth  United States
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Jens' active thread on analog crossover is here:
Analog active xover

There is also moamps' project, which is a different take on the same basic idea:
MOX - active crossover

I must admit that I am currently organizing a group buy on a design that arose out of moamps' project. I think it is excellant in terms of tweaking/forward compatibility.
MOX-like crossover and discrete opamp group buy
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Old 4th May 2004, 07:48 PM   #99
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Tiroth, Thanks.
I understand that your project is as same as the mox (just pcbs).
Do you have an estimation of the total costs?
If I'll use, as a a start, op-amps, the final sound will be much less?
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Old 4th May 2004, 11:09 PM   #100
tiroth is offline tiroth  United States
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Boaz, why don't you shoot me an email or post in the group buy thread and we can discuss. I don't want to threadjack this one. Thanks.
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