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Old 1st February 2004, 12:14 AM   #1
rchua77 is offline rchua77  Singapore
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Default 2 channel in, 4 channel out

Hello guys

Anyone knows how to do this? Using 2 x RCA jacks for input and having 4 speaker outputs. Am trying to avoid using active cross-overs.

Regards
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Old 1st February 2004, 01:04 AM   #2
sss is offline sss  Israel
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Old 1st February 2004, 03:35 AM   #3
rchua77 is offline rchua77  Singapore
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my apologies for the confusion, the 4 channel out isnt for surround sound. Its for bi-amping where i'm trying to avoid the use of active crossovers.

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Old 1st February 2004, 04:14 AM   #4
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well if it's not an external box...then it would have to be a crossover inside the amp itself...if u aren't going active I suppose u're trying to go passive??
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Old 1st February 2004, 05:17 AM   #5
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buffer the 2 speaker outputs and feed another amplifier
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Old 1st February 2004, 05:58 AM   #6
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Quote:
Originally posted by rchua77
my apologies for the confusion, the 4 channel out isnt for surround sound. Its for bi-amping where i'm trying to avoid the use of active crossovers.

Regards

Why avoid using active, there really not that hard...actually just as simple as a buffer circuit, plus you can use those real expensive caps that you would have used in passives, because you only need like 0.1uF caps, which are cheap no matter what brand (compared to 7+uF) and you 1% or 0.1% resistors are justs cents.
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Old 1st February 2004, 07:26 AM   #7
rchua77 is offline rchua77  Singapore
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Hi All,

If I go active crossover, I would have to remove the passive components in the loudspeakers. And the removal might damage the loudspeakers. I'm an elephant in a china shop, so I wouldnt want to damage the speakers.

So I was wondering if I can just parallel the 2 RCA inputs into 4 different amplifiers to get 4 speaker channels out.

I understand I can leave the passive crossovers in the loudspeakers and still use activer crossovers. But wouldn't generate more losses?

Thanks
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Old 1st February 2004, 07:35 AM   #8
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I dun get u...how do plan to Bi-Amp if u still leave the xover inside the speaker?? And if u have 4 outputs...how do u plan to rig them up to just 2 speakers?? Unless u're talking about bridging...
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Old 1st February 2004, 10:54 AM   #9
sreten is offline sreten  United Kingdom
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Quote:
Originally posted by rchua77
Hi All,

If I go active crossover, I would have to remove the passive components in the loudspeakers. And the removal might damage the loudspeakers. I'm an elephant in a china shop, so I wouldnt want to damage the speakers.

So I was wondering if I can just parallel the 2 RCA inputs into 4 different amplifiers to get 4 speaker channels out.

I understand I can leave the passive crossovers in the loudspeakers and still use activer crossovers. But wouldn't generate more losses?

Thanks
You can easily parrallel each output to two amplifiers.

For passive bi-amping as the above the power amplifiers
must have the same gain.

Alternatively there are more intelligent approaches :

Use a lower power amplifier for the treble units (same gain
though) but change the input coupling capacitor to roll off
response below ~ 500Hz.
Or use a higher gain amplifier as above for treble with a level control.

Using active crossovers and the speakers crossover is not
a good idea.

sreten.
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Old 1st February 2004, 12:15 PM   #10
hacknet is offline hacknet  Singapore
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well, it seems you are looking for another connection for the 2nd pair of speakers... if this is the case, all you need to do is add another pair of binding post to "add" another pair of speakers terminals...


channel 1 -> RCA of AMP Channel 1 -> output 1a and 1b. all you need is another pair of binding post....


is this what you are looking for...?
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