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Old 17th April 2003, 10:20 PM   #1
Ford_V6 is offline Ford_V6  Romania
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Default Left - SubWoofer - Right Crossover

Hy.

I want to make this kind of crossover to connect a 12" sub and two sattelites (8" mid + TW) to the power amp.

All the speakers are 8 ohm.

Now. . . i would like the crossover to cut at 150 Hz. The sub must play what's under 150 Hz and the sattelites the rest.

What values would you recommend me for C and L in this case.

I have 64uF and 1.7 mH. Are these values right ?

Do you know a better method to connect these speakers to a stereo power amp ?


Thanks,
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Old 18th April 2003, 12:18 AM   #2
moamps is offline moamps  Croatia
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Hi,

your schematic can not work; sub play only diference between L and R channel, Left MTW is out of phase.

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Old 18th April 2003, 07:14 AM   #3
Ford_V6 is offline Ford_V6  Romania
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Ok, thanks

Now how can i still connect a subwoofer and two sattelites to a stereo amp ?

A link, a schematic something ?


Regards,
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Old 18th April 2003, 10:04 AM   #4
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Hi Ford

I have never seen a passive crossover that will sum the bass from two channels .

Your options are to buy a dual voice coil sub driver, and use a circuit similar to the one below, (this crosses over 1st order 100Hz, and I would not recommend going higher for a single sub), or go active and build a PLLXO from Planet 10's site and get another amp.
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Old 18th April 2003, 01:28 PM   #5
audioPT is offline audioPT  Portugal
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Simple:

Just do this;

1- in one chanel, insert a inverter before the input of the amplifier, using a simple opamp.
2- in the output if this channel, invert the polarity of the speaker.

Here you have the 'magic of this':

connect the sub to the + outputs of both channels.
You can still use the crossovers you design.



Any comments from moamps and pinkmouse?

This is a simple configuration of car audio amplifiers

Pedro Martins
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Old 18th April 2003, 02:47 PM   #6
moamps is offline moamps  Croatia
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Quote:
Originally posted by audioPT

Any comments from moamps and pinkmouse?

Hi, Pedro

Idea is OK. But, if somebody has knowledge to install inverter between preamp and amp, I think that better idea is implementation active sub.
In passive combination anyway you have big work to do; from huge choke for sub and rest of world to adjustment levels between. Simplest way is active.IMHO

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Old 18th April 2003, 03:34 PM   #7
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Quote:
Originally posted by moamps
Idea is OK. But, if somebody has knowledge to install inverter between preamp and amp, I think that better idea is implementation active sub.
In passive combination anyway you have big work to do; from huge choke for sub and rest of world to adjustment levels between. Simplest way is active.
Seconded
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Old 18th April 2003, 03:47 PM   #8
audioPT is offline audioPT  Portugal
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Of course active is the best way.

But I'm only thinking in low cost for Ford_V6
The implementation of an opamp it's very easy, right?

If cost isn't important, go active!

Regards

Pedro Martins
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Old 20th April 2003, 01:29 PM   #9
Ford_V6 is offline Ford_V6  Romania
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Ok

Thanks, i will go active.

I was thinking in using a bridge configuration of the TDA7294 for the power stage.

Or is better a discrete amp ?

What do you think ?
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Old 20th April 2003, 03:13 PM   #10
audioPT is offline audioPT  Portugal
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Go!

The better way to don't waste time is using bridged TDA's

Pedro Martins
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