Thanks for this video. I agree with everything except that 50W is not enough. In my experience if your speakers aren't very inefficient and your room isn't large, 50W is enough.
It depends on the listening distance. There is a video where Harbeth's lab measured peak power for normal listening of electronic music. You may be surprised. th-cam.com/video/Y3WpRY-EtX8/w-d-xo.htmlsi=26I87egRuEx9Gp4d
@@siarez You are right, for some music types,s 20W is more than enough. On the other hand, money has been invested, and the system is limited to certain music formats and near-field listening. A lot of music performance in a room depends on the amount of initiated air. This way, we have large-dimensional speaker systems along with small ones and standardize them by field. Near field up to 1m. Middle field 2-3 and far field above 3m. However, even studying studios near field monitors have 150W typical incorporated power. I have tested small 40W speakers driven by 150W amp, and they really open.
Hi! Is it any possibility to damage speakers with too powerful amp? For example, KEF Q750 manufacturer amplifier requirements are 15-150W, but I want to use ICEpower 1200AS2.
No, it is tough. Anu speakers can handle short-term 8 times rated power. The dangerous part is clipping when your output, due to distortion,s has a DC component, and then a low-power amplifier burns the woofer with a DC component or tweeter with excessive harmonics at a high-frequency spectrum.
I have 325w on 150w speakers, and they opened up considerably. On 100wpc reciever power, a tweeter was blown. I have some 125w speakers that also took the 325w easily. When you hear distortion, that's not your speakers. It's the amp running out of power.
@Guntars Smits: On big shortcoming of many Class D designs is signal overshooting. Where can I find square wave measurements of the 1200AS2? I'm really interested :)
To measure the meander, you need an oscilloscope with an insulated probe ( due to bridged amplifier configuration) and provide a signal from your DAC using an internet signal generator or some reference generator. I guess those measurements are not in Audio Science Review because they are good and may impact more expensive unit sales. I am not publishing measurements due to the potential impact on other company businesses, and as a company, I have to do it with expensive devices with valid certificates from the state test and measurement lab. There are legal risks, and I will not do that.
To correctly measure the audio signal, you should filter meander to 20Khz bandwidth as it is done in the recording studio. Most of the measurements which I have seen are not done in this way. There is a filter at class d output, which on 8 ohms load can peak at 50Khz, but the normal audio signal is limited to 20Khz with a hard 60 db filter. 1200 has in loop filter and is not peaking at all. The pulse should be flat.
@@guntarssmits2104 Thank you, I understand this so far. I will not get into it before I know about the impulse response. I already have 'lively' sounding amps that are nice so far, but need to be sure to built a 'calm' one next time, to get a slightly different sounding atlernative.
Very different approach, especially customer/marketing analysis... Thanks :)
Thanks for this video. I agree with everything except that 50W is not enough. In my experience if your speakers aren't very inefficient and your room isn't large, 50W is enough.
It depends on the listening distance. There is a video where Harbeth's lab measured peak power for normal listening of electronic music. You may be surprised. th-cam.com/video/Y3WpRY-EtX8/w-d-xo.htmlsi=26I87egRuEx9Gp4d
@@guntarssmits2104 Thanks for the link. Yes, I have seen speakers gulp that much power on bass heavy tracks. The power demanded to play
@@siarez You are right, for some music types,s 20W is more than enough. On the other hand, money has been invested, and the system is limited to certain music formats and near-field listening. A lot of music performance in a room depends on the amount of initiated air. This way, we have large-dimensional speaker systems along with small ones and standardize them by field. Near field up to 1m. Middle field 2-3 and far field above 3m. However, even studying studios near field monitors have 150W typical incorporated power. I have tested small 40W speakers driven by 150W amp, and they really open.
Hi! Is it any possibility to damage speakers with too powerful amp? For example, KEF Q750 manufacturer amplifier requirements are 15-150W, but I want to use ICEpower 1200AS2.
It's way simpler to destroy speakers with an underpowered amp than vice versa.
No, it is tough. Anu speakers can handle short-term 8 times rated power. The dangerous part is clipping when your output, due to distortion,s has a DC component, and then a low-power amplifier burns the woofer with a DC component or tweeter with excessive harmonics at a high-frequency spectrum.
Thanks
I have 325w on 150w speakers, and they opened up considerably. On 100wpc reciever power, a tweeter was blown. I have some 125w speakers that also took the 325w easily. When you hear distortion, that's not your speakers. It's the amp running out of power.
@Guntars Smits: On big shortcoming of many Class D designs is signal overshooting. Where can I find square wave measurements of the 1200AS2? I'm really interested :)
To measure the meander, you need an oscilloscope with an insulated probe ( due to bridged amplifier configuration) and provide a signal from your DAC using an internet signal generator or some reference generator. I guess those measurements are not in Audio Science Review because they are good and may impact more expensive unit sales. I am not publishing measurements due to the potential impact on other company businesses, and as a company, I have to do it with expensive devices with valid certificates from the state test and measurement lab. There are legal risks, and I will not do that.
To correctly measure the audio signal, you should filter meander to 20Khz bandwidth as it is done in the recording studio. Most of the measurements which I have seen are not done in this way. There is a filter at class d output, which on 8 ohms load can peak at 50Khz, but the normal audio signal is limited to 20Khz with a hard 60 db filter. 1200 has in loop filter and is not peaking at all. The pulse should be flat.
@@guntarssmits2104 Thank you, I understand this so far. I will not get into it before I know about the impulse response. I already have 'lively' sounding amps that are nice so far, but need to be sure to built a 'calm' one next time, to get a slightly different sounding atlernative.