13-Oct-2015, 09:31
To clarify my earlier point, I have stolen some words from the 'net:
"Two amplifiers, each rated 100 watts maximum into 4 ohms, in bridge mode they will appear as a mono amp rated 200 watts into 8 ohms"
"It is sometimes stated that operating an amplifier pair in bridge mode can give four times the power (of one of the pair). This statement makes reference to the fact that power is proportional to the square of the voltage, implying that if the output voltage is doubled – as it is in bridge mode – then the power available increases by a factor of four. This would be true if the amplifier in bridged mode were used to drive loudspeakers of the same impedance used in stereo mode. However, in this case, the current through the loudspeaker and the amplifier would also double, which could exceed the amplifier ratings and lead to overheating and finally destruction of the amplifier."
So; you can get more power in dual mono mode, hence a 250 more than doubling to a 800. However, this does come with additional current, and hence heat. So if the cooling properties of the 200 are "on the limit", Devialet have very wisely kept maximum power in a dual mono governed down to 400w. The 250 is also being held back from the theoretical maximum of 4 x 250 =1000w. So the limits of cooling are the key here.
So why doesn't a 250 deliver more than 250w? The reason for this is that it is not designed to, there is a design limit (maybe many limits) keeping it to 250w, but it looks like this limit is not temperature related, hence it's ability to go to 800 in dual mono mode. Although the 800w probably is temperature related, here the D800 finds it's thermal limit.
"Two amplifiers, each rated 100 watts maximum into 4 ohms, in bridge mode they will appear as a mono amp rated 200 watts into 8 ohms"
"It is sometimes stated that operating an amplifier pair in bridge mode can give four times the power (of one of the pair). This statement makes reference to the fact that power is proportional to the square of the voltage, implying that if the output voltage is doubled – as it is in bridge mode – then the power available increases by a factor of four. This would be true if the amplifier in bridged mode were used to drive loudspeakers of the same impedance used in stereo mode. However, in this case, the current through the loudspeaker and the amplifier would also double, which could exceed the amplifier ratings and lead to overheating and finally destruction of the amplifier."
So; you can get more power in dual mono mode, hence a 250 more than doubling to a 800. However, this does come with additional current, and hence heat. So if the cooling properties of the 200 are "on the limit", Devialet have very wisely kept maximum power in a dual mono governed down to 400w. The 250 is also being held back from the theoretical maximum of 4 x 250 =1000w. So the limits of cooling are the key here.
So why doesn't a 250 deliver more than 250w? The reason for this is that it is not designed to, there is a design limit (maybe many limits) keeping it to 250w, but it looks like this limit is not temperature related, hence it's ability to go to 800 in dual mono mode. Although the 800w probably is temperature related, here the D800 finds it's thermal limit.
