wallcolmx
Yun heat ang nakasira sa unit mo.
mabilis uminit units natin, flaw ng mt21 pero hindi ganun ka-grabe sa mt21s at tb21 and tb21s.
(share ko notes at mga natutunan ko from comparing different sources, you guys might know these already pero maganda siguro mashare na rin sa silent readers. but don't follow blindly, ask people and do own research parin.)
Accdg to datasheet ng mt21 IC,
40+40+80 lang tlga sya.
24v max, yun ang pinaka efficient na voltage with best SQ kaya lang the higher the voltage, mas mataas din ang heat. So it's ideal to use fan especially when using it at higher volume. (you had the subwoofer channel at max therefore more heat)
May napanood ako nagexplain:
75% volume is equal to 100% volume.
no difference in decibels, only greater power and heat, so 75% or less lang daw dapat ang volume knobs.
Power Supply, dapat daw more than requirement ng ampli to avoid shortage and signal getting clipped.
Clipping is bad sa audio, can break speaker voice coil.
Clipping is also produce when gain is too high, wala gain adjustment sa class-D amps natin kaya dapat alalay sa volume, pag may narinig na distortion or clipping...lessen volume agad.
Regarding matching nmn.
amp > speakers
- pag nasobrahan sa volume which is bad sa low spec speaker sa case na ito, we can easily recognize distortion sa sound kaya we automatically lowers it which prevents speaker voice coil breakage.
speakers > ampli
- when running ampli at high volumes, we won't get warned na overworked na si amplifier coz goods ang sound sa speakers dahil kayang kaya nya yun power, hindi natin alam nagiinit na pala ampli
medyo risky..
pero it's not that bad, I've seen people use 10 or 12 inches 700w subwoofer and later suggests 8inches can be used for long playtime, we just need to observe temps to find volume limit that doesn't heats the ampli too much. however, other users at home may exceed it..
For protection, we can use thermal switch or fuse.
or use stronger fan that can maintain safe temp even at max volume with bass heavy music.
maybe use stronger fan and thermal switch/fuse at the same time and embed it inside subwoofer box.