2 channel in, 4 channel out

[rchua77]

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

 

[sss]

check out Rods page



http://sound.westhost.com/project18.htm

 

[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

 

[li_gangyi]

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??

 

[JOE DIRT®]

buffer the 2 speaker outputs and feed another amplifier

 

[Hybrid fourdoor]

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.

 

[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

 

[li_gangyi]

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...

 

[sreten]

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.

 

[hacknet]

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...?

 

[mb]

rchua,

you are getting all sorts of answers because your question is very unclear. i sense you're asking how to connect a stereo input (L+R) to two pairs of amps. in this case, as long as your source or preamp have reasonable output impedance, and the two sets of amps have high(ish) input impedance, then you're in business. either a 'Y" cable or parallel cabling.

re: hacknet's suggestion: fine, provided the speakers are not so low impedance that they cause problems. your reference to "avoiding active xo" is puzzling though...