Passive subwoofer driving through speaker B

[koushik]

Hi Friends,

I have Sonodyne SIA which has bind posts for 2 pair of speakers. Can I use the Speaker B to connect a DIY passive subwoofer and drive all the four channels at a time?
-Will I get desired result
-Will there be any danger for Amp?

See the image below for the schema.

View attachment 5987

 

[Santy]

If the amp has option to play both A and B together, then it will work for sure. But how much difference you will get can be understood only by playing it (since the speakers are floor standers already). Note that in your schema you have shorted both left and right terminals (+ with + and - with -) which is NOT to be done! It will damage the amp. Only one channel you can connect to the sub, as far as I know.

Hope your DIY includes crossover components otherwise you will hear all frequencies from the sub which is undesired.

 

[captrajesh]

You are bridging speaker 'B' terminals to drive the subwoofer. This would definitely put additional load on the amp. Whether it can damage the amp or not is a hypothetical question; it would depend on the driver's impedance and the amp's specs.

 

[koushik]

Driver's spec is 8 ohm. In the amp's manual recommended connections are:
Only A - 4 ohm or more
Only B - 4 ohm or more
A + B - 8 ohm or more.

No mention about bridging. Which spec to look at in amp for this connection?

@Santy - Yes there will be passive crossover.

 

[koushik]

Sorry guys, just checked an online spec from Sonodyne, it says we can't bridge in this Amp.

 

[Santy]

Koushik
If they have mentioned about recommended load for A+B connection in the manual then both can be played simultaneously if I am not wrong?
Did you test it? Connect one FS to A and another one to B and check? If it works, may be just left or right of output B can be used for the sub?

Also, why do we need bridging, I am not very clear (pardon me I am also learning).
I was thinking that the amp should support "Bi-amping" rather?
Most of the integrated amps like this Sonodyne having two outputs A and B would allow Bi-amping?
As long as FS and Sub have a 8 ohm impedance, we can connect them to A and B outputs respectively?
The problem however is that the sub can be connected only to left or right channel of output B

Only when you need the power of both left and right channels of B into one output (making it mono) we need bridging, ie to double the power. Again, it needs another amp.
Can Capt. or someone confirm If I make sense

 

[koushik]

Certainly it can play both A and B at the same time. But I wanted to Bridge so that the lows from both channel get played through the Sub.

As you have "The problem however is that the sub can be connected only to left or right channel of output B". This is the problem. I don't want to miss either left or right.

 

[Tanoj]

IMO if we use diode for both the channels, it will not harm the AMP

not very sure, as far as i know it will help the power to flow to the sub and stops revers flow, so channel A and Channel B , both can be used

this is just my assumption, you may check with a electronic savy people

:thumbsup: best wishes to you


Cheers

Tanoj

 

[anuragn]

IMO if we use diode for both the channels, it will not harm the AMP

not very sure, as far as i know it will help the power to flow to the sub and stops revers flow, so channel A and Channel B , both can be used

this is just my assumption, you may check with a electronic savy people

:thumbsup: best wishes to you


Cheers

Tanoj

Audio signals are sine waves. A diode will clip one half of the cycle, hence reduce the power transferred to the drivers and defeat the very purpose of utilising both channels.