Thanks for the help guys. Looks like my idea won't work the way I wanted it to. I guess it's time to try something else.

 

As mentioned already... you could bridge the bridged channels in parallel... this is the easy way to do it.... but, both channels must have ouput levels that are matched exactly or one channel will feed power into the 2nd channel.... the result (sooner or later) will be a roasted amp...

If you have an accurate way to measure voltage, you can do it.... (I believe the recommendation I heard was to set gains so there is less then 10ma of output difference- looking at 6mv diff or less for a 4ohm load)

In this guys application it would be a waste of time... It would only be worth while if you wanted to run under 4ohm and needed more current then two bridged channels could provide.....


The other way to do it is to bridge the bridged channels in series.... you will need a bridge modual to invert the phase on one bridged channel, and one bridged channel must use a floating (isolated) ground....

As I recall, neg on one amp is connected with +ve on other amp on one side of the load and vica versa on the other side... Normally wiring like this would simply mean that the +ve and -ve terminals are shorted on either side of the load.... but because they use a different reference ground the current will not flow beween the amps and can only move across the load back to its own amp... the result is 2x the voltage difference on either side of the load...

Again, even if you had the ability to set this up... it would be a waste of time in this guys situation... bridging 2 4ohm stable channles would result in a single 8ohm stable channel... (and he has a 4ohm sub)

You would also have the problem of isolating ground beween channels in a single amp chassis... if it used dual power supplies, it might not be that bad... if it uses a single supply you would have to add another....

[ January 18, 2005, 01:16 PM: Message edited by: Haunz ]

 

Haunz,

You would be hard pressed to match the two channels bias current to within 10ma with a gain control (if the amp even has seperate gains for each channel).

You would have to open up the amp and adjust bias current internally.......even after doing this the amp would still blow.

Like I have said twice and maltesechicken has also said....the fix for Nickelnutz is a new amp, a second svc sub or a single dvc sub. (I dont like running seperate coils with seperate channels too much)

Cheers

 

The new MTX 4 channels are bridgeable mono. [img]graemlins/offtopic1.gif[/img]

 

You might be hard pressed... not me... [img]graemlins/laugh.gif[/img]