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

[Javier Herrero]

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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-- 
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Javier Herrero                            EMAIL: jherrero at hvsistemas.com
HV Sistemas S.L.                          PHONE:         +34 949 336 806
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