Output Wiring for Bridged Amp

[Stuart]

Can anyone help?.

I've recently got hold of a Martin Audio M800 control Amplifer (Lab
Gruppen?) and want to bridge it to get 800w @ 8 ohms (400 w/channel at 4
ohms). Theres no bridge switch on it but there is a bridge LED on the front
pannel, how do I bridge it? only thing I can think of is that theres an
internal jumper. If i engaged the bridge mode what will the output wiring
be? there is only 2 speakon out sockets, Ch1 and 2; would it be +1(red)
+2(black) instead of +1(red) -1(black) from output Ch1? and only use Ch1
input?

thanks

Stuart.

[(Bob) Robert S. Ely]

The voices in the head of Stuart uttered these words to the inhabitants of
alt.audio.pro.live-sound.

> Martin Audio M800

Stuart,
Are you sure it is Martin and not Mackie?
http://www.mackie.com/products/m800/index.html The Martin Audio web site
doesn't have that designation for an amplifier They are all labeles as MS#.
# http://www.martin-audio.com/martin1/main.html.

--

Robert S. Ely (Bob)
rse...@optonline.net rober...@dhs.state.nj.us
New Lisbon Developmental Center Communications Systems Technician-3
Work Phone: 1-609-894-4057 Work FAX: 1-609-726-0357
ICQ: 33390750 Yahoo Messenger: rsely74

Check out my photos:
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[(Bob) Robert S. Ely]

The voices in the head of Stuart uttered these words to the inhabitants of
alt.audio.pro.live-sound.

> Martin Audio M800

Stuart,
You'd have to read the manual. One channen usually drives the
positive half cycle of the signal and the other drives the negative half.
Combining them gives you full wave. Meaning that the Left + (1+) would be
the normal positive and Right + (1+) would be your negative. The input
would have to be switched somehow to split the signal in the same way as
you'd wire the output. Usually Left channel is used or a seperate bridged
input for that porpose.

[Phil Allison]

"(Bob) Robert S. Ely" <rse...@optonline.net> wrote in message news:>

> You'd have to read the manual. One channen usually drives the
> positive half cycle of the signal and the other drives the negative half.

> Combining them gives you full wave. ....

** Giant huh???

Where the hell did you get this whacky idea from ??

The two channels operate normally - but with opposite phase.

.................. Phil

[Tim Scott]

"Phil Allison" <phila...@optusnet.com.au> wrote in message
news:3ec9924d$0$16388$afc3...@news.optusnet.com.au...

or one channel pulls the speaker and the other pushes it

[(Bob) Robert S. Ely]

The voices in the head of Tim Scott uttered these words to the inhabitants
of alt.audio.pro.live-sound.

>

Phil,
That's pretty much what I was trying to say, but my works didn't say
it properly. Yes they do work normally. I was trying to get across the idea
that one terminal/channel is USED for the positive and one is used for
negative, not that they actually function that way.

Phildo,
Better explanation/words for what I meant.

[Phil Allison]

"Tim Scott" <sue-d...@orange.net> wrote in message
news:bactft$djs$1...@news8.svr.pol.co.uk...

** That is kinda right if you imagine the speaker has a centre tap on
the voice coil.

With bridge mode drive that centre tap always has zero volts and so
could in theory be connected to amp ground with no resulting current flow.

This is an easy way to visualise why it is that each channel an amp
operating in bridge mode "sees" only half the load impedance.

............ Phil

[Robert McTigue]

>
>
> > You'd have to read the manual. One channen usually drives the
> > positive half cycle of the signal and the other drives the negative half.
> > Combining them gives you full wave. ....
>
>
> ** Giant huh???
>
> Where the hell did you get this whacky idea from ??
>
> The two channels operate normally - but with opposite phase.
>
>
> .................. Phil

Here we go......