Focer Font of knowledge speaker power RMS and stuff

[fazersharp]

Thanks everyone for the help based on that I have brought the new unit only had time to test with its own speakers for now. But will do some tests soon

[bludclot]

Speakers do not have any power - hence do not have a power rating. The quoted wattage figure is a nominal power handling figure.


Amplifiers have a power rating, typically quoted as an RMS figure, standing for root mean square. Sound waves (generated by an amplifier in terms of current) go up and down, so measuring these peaks and troughs meaningfully becomes difficult, hence taking an RMS approach, think of it as about 0.6 of peak or so, hence a 6W amplifier might actually produce 10W when run hard.


Clipping is what damages or 'blows' speakers. If the volume is turned so high that the amplifier cannot reproduce the required current peak then a prolonged 'flat top' peak is generated. Speakers react to peaks by vibrating - a peak will push a speaker driver outwards. A clipped signal asks the speaker cone to travel outwards and not return, something speakers don't like - hence damaging it. Think of it like taking a slap or a prolonged hard press against a cheek...


Given the above it should be clear that a higher rated (or bigger) amplifier is far less likely to damage speakers than a smaller one as it has more head room to produce accurate peaks without clipping.


In any case, just don't turn volume controls up beyond distortion levels and all should stay well.


Regarding your choice of system and budget, that money, if spent wisely and with some patience, will yield a little used separate amplifier and (say) tuner which will be night and day difference in sound quality. I have a really good tuner spare you can have for free for starters.

[fazersharp]

Speakers do not have any power - hence do not have a power rating. The quoted wattage figure is a nominal power handling figure.


Amplifiers have a power rating, typically quoted as an RMS figure, standing for root mean square. Sound waves (generated by an amplifier in terms of current) go up and down, so measuring these peaks and troughs meaningfully becomes difficult, hence taking an RMS approach, think of it as about 0.6 of peak or so, hence a 6W amplifier might actually produce 10W when run hard.


Clipping is what damages or 'blows' speakers. If the volume is turned so high that the amplifier cannot reproduce the required current peak then a prolonged 'flat top' peak is generated. Speakers react to peaks by vibrating - a peak will push a speaker driver outwards. A clipped signal asks the speaker cone to travel outwards and not return, something speakers don't like - hence damaging it. Think of it like taking a slap or a prolonged hard press against a cheek...


Given the above it should be clear that a higher rated (or bigger) amplifier is far less likely to damage speakers than a smaller one as it has more head room to produce accurate peaks without clipping.


In any case, just don't turn volume controls up beyond distortion levels and all should stay well.


Regarding your choice of system and budget, that money, if spent wisely and with some patience, will yield a little used separate amplifier and (say) tuner which will be night and day difference in sound quality. I have a really good tuner spare you can have for free for starters.

Thank you for your kind offer but the unit has to be a certain type to fit in the hole. Primarily for cds but just having a play I am enjoying being able to play utube music through the blutooth - all be it with quality issues with some of the uploads. I also listen to a lot of radio with some stations being only on DAB, I need the DAB facility, but I may need to extend the aerial when it is installed in its permanent position .  I don't think that you can see pictures if you are on a phone but I have added some pictures in my other posts.
I am guilty of cranking it up but back off if it distorts the sound because it sounds rubbish but I did not know that it is also damaging the speakers.

[fazersharp]

On comparing the old set and new set of speakers they are about the same size but my old ones have a tweeter and woofer and a port at the back but the new ones only have 1 speaker (cone) and in the place of the tweeter it has a port in the front.
So on paper without a sound test which speakers would be better. My old ones are about 15 years old. I tend to find the older stuff is usually better made. 

[darrsi]

I think maybe your best option here is to demolish your house and build another one from scratch set around your new music system.
Makes perfect sense to me.