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I'm not educated in the actual electronics but do have experience speaker wise:
Speakers have a wattage rating and and good ones offer an efficiency rating. The efficiency rating tells a consumer how loud a speaker should play given a certain input value.
So, from memory it reads something like:
1 watt of input (such as pink noise or 'prrrrrrrrrrrrfffffft' to you and me) should generate around 86 to 102 decibels - db, depending on the speaker design.
The average home amplifer set up, to raise the roof, barely uses 5 - 11 watts depending on the speakers' efficiency.
How an amplifier delivers this depends on its power supply. Many cheapy amps used to be sold with '1000w PMPO' peak maximum power output, just before the amp goes 'futt' - in real money, these 1000w amps were barely 50w at best with weedy power supplies.
So, given your amp is struggling to power two sets of speakers simultaneously, I'd venture that the bookshelf speakers are pretty hard to drive and dont go as loud as the more efficient floor standers. The difficult loads also mean that the speakers are drawing much more current from the amp's power supply than it can manage, hence the heat and subsequent failure.
It is much easier to damage speakers by under driving them than it is to use a massive amplifier. Weedy amps clip early on and send out spurious voltages that fry the speaker coils, usually the tweeters die first.
Amplifiers also have power outputs depending on the impedance of the speaker such as 30w into 8 ohm, 45w into 6 ohm and 60w into 4 ohm - this is because the lower the impedance of the speaker, the more current it draws from the amplifier, the amplifier has to work hard to power the speakers. So your 2 ohm combined load really gives the amplifier something to do, especially at high volumes.
So from your recent post you should be looking for speakers with 8 ohms and a high efficiency rating which will make two pairs easy to drive.
Hope this rambling helps!
Time for a new amp or a rethink of your speakers.
Speakers have a wattage rating and and good ones offer an efficiency rating. The efficiency rating tells a consumer how loud a speaker should play given a certain input value.
So, from memory it reads something like:
1 watt of input (such as pink noise or 'prrrrrrrrrrrrfffffft' to you and me) should generate around 86 to 102 decibels - db, depending on the speaker design.
The average home amplifer set up, to raise the roof, barely uses 5 - 11 watts depending on the speakers' efficiency.
How an amplifier delivers this depends on its power supply. Many cheapy amps used to be sold with '1000w PMPO' peak maximum power output, just before the amp goes 'futt' - in real money, these 1000w amps were barely 50w at best with weedy power supplies.
So, given your amp is struggling to power two sets of speakers simultaneously, I'd venture that the bookshelf speakers are pretty hard to drive and dont go as loud as the more efficient floor standers. The difficult loads also mean that the speakers are drawing much more current from the amp's power supply than it can manage, hence the heat and subsequent failure.
It is much easier to damage speakers by under driving them than it is to use a massive amplifier. Weedy amps clip early on and send out spurious voltages that fry the speaker coils, usually the tweeters die first.
Amplifiers also have power outputs depending on the impedance of the speaker such as 30w into 8 ohm, 45w into 6 ohm and 60w into 4 ohm - this is because the lower the impedance of the speaker, the more current it draws from the amplifier, the amplifier has to work hard to power the speakers. So your 2 ohm combined load really gives the amplifier something to do, especially at high volumes.
So from your recent post you should be looking for speakers with 8 ohms and a high efficiency rating which will make two pairs easy to drive.
Hope this rambling helps!
Time for a new amp or a rethink of your speakers.
