[time-nuts] COMPLETELY off topic - but I know you'll read it anyway.

[Jim Palfreyman]

Thanks folks for your quick replies.

I've dug out the manual and even though the specifications say it can do 4
ohms in bridged mode, there is another statement that says it doesn't
recommend it.

Here is what it says about bridged mode:

"The A channel handles the positive voltage and the B channel becomes the
negative, thus doubling the output voltage swing."

Needless to say, Poul's comment regarding running them as two separate
channels because if one fails I'll have another as a spare is the clincher
for me. Being from an IT background - backup is all important.

Thanks folks!



2008/10/11 Javier Herrero <jherrero at hvsistemas.es>

> If 500W are specified for a 4 ohm load, you will only obtain 250W for
> each channel over a 8 ohm speaker. In bridged mode, it is not true that
> basically one channel drives the upper part of the sine and the other
> the lower: they operate in push-pull, supplying each side of the speaker
> with opposite phases so you will obtain the double peak-to-peak  voltage
> value over the load than in the single ended configuration. Double
> voltage would mean four-times power, so the amplifier surely is not
> rated for the same load in bridged mode than in single-ended two-channel
> mode. If minimum load for each channel is 4 ohm in single-ended mode,
> usually it is 8 ohm for two channels in bridged mode.
>
> So if you have 8 ohm speakers... use it in single ended mode (better
> reliability also, as Poul-Henning pointed), and you will get 250W per
> channel. In brigde mode, you could only put the two speakers in parallel
> if the amplifier is rated for 4 ohm loads in bridged mode.
>
> Regards,
>
> Javier
>
> Jim Palfreyman escribió:
> > OK I have an interesting but simple problem that has nothing to do with
> > time. But I'm sure someone on this list will know. And besides I can't be
> > stuffed finding another list with such a good S/N ratio.
> >
> > In my spare time I play in a band.
> >
> > I have a 1000W amplifier that can be either two 500W stereo channels or a
> > single 1000W mono running in "bridged" mode. (Basically one channel
> > amplifies the upper part of the sine curve and the other the lower.)
> >
> > The amp can drive speakers down to 4 ohms.
> >
> > I have two 8 ohm speakers.
> >
> > The source is mono.
> >
> > Do I run each 8 ohm speaker on its own 500W channel?
> >
> > or
> >
> > Do I run in bridged mode and put the two speakers in parallel onto the
> 1000W
> > amplifier?
> >
> > Any takers?
> >
> > Regards,
> >
> > Jim
> > _______________________________________________
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>
> --
> ------------------------------------------------------------------------
> Javier Herrero                            EMAIL: jherrero at hvsistemas.com
> HV Sistemas S.L.                          PHONE:         +34 949 336 806
> Los Charcones, 17A                        FAX:           +34 949 336 792
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>
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