can u give me what kind of brand speaker use this chip? want test how old skool it is.. i like 90's sounding so bad

acs45.1

can u upload the pcb picture so we can see..interested..

urgh... looks like this?


This post has been edited by beggarmaster2000: Aug 8 2010, 03:35 AM

in you opinion which on sound better down of fron firing woofer?

hmmn down firing is good, if properly implemented... atp3 has fairly good implementation because its versatile construction, can be placed anywhere and will be consistant
side, fornt firing ones need to be placed in the sweet spot =)

only downside in altec lansings is the heat sink placement, size, shape and the box not fully wooden. the plastic parts makes sounds vibrate

down firing is good when the subwoofer is huge... but I don't recommend small speakers to have down firing subwoofer cuz they are too weak
front firing is great on big and small speakers. but yes... the position is very important

Guys, my VS4121 recently decided to give up halfway on me. Meaning only the left channel ( the one without controls is functioning). The right one is silent. I'm guessing that the cable is damaged or something.

The controls work perfectly fine. I wonder if I can repair this problem or DIY it. But I don't dare cut open the thick cable without knowing what's inside.

Any help sifus??

try to disassemble the right speaker by removing the rubber pads to reveal the hidden screws.
once you have a good look at it... I bet you'll know what to do

okay bro, thanks. any tips or points to watch out for??

p/s - small prob here bro, i cant locate the screws after taking out the sponge paddings on the speaker. do i need to take off the knobs as well??

This post has been edited by mr_maverix: Oct 20 2010, 05:56 PM

no screws? that's sad...
if I've caused any problems... I'd say sorry first

knobs come off once you found the screws... so do that later

you sure there is no screws hidden there?

i still cant find any hidden screws there..i kept looking around at the base of the speaker, where the downfiring speaker is mounted..took off the sponges, and still cant find any bro..

hello guyz..can anyone help me,now my vs4121 sub woofer produce buzzing sound when i switch it on..but its not coming from interfere with any electronic device..the buzz seem to be permanent but when i plug out right side the buzzing sound goes off..when i plug in back the right jack the buzzing sound will produce again..is any1 already facing this problem before?thank

The amplifier board inside need diagnosis and repair. The last time I did one with buzzing was a dry joint at the PSU section which the main filter cap was having a loose solder joint. Resoldering the points did the trick. Could be coincidental with others having buzzing sound, I won't know.

I modded the VS4121 by changing the voltage regulator to a 12V one, it improved the sound tremendously. The original one was 9V regulator and supplies DC to the main TDA chip.

sometimes it is also because of the wire starting to die off. that causes the buzzing sound.

just an opinion

I see..mybe that the reason why it buzzing..

Hi guys,
Do you guys know the power output rating for ATP3's power transformer?

40-50VA at the most, 1.5Amp maximum, not exactly optimum but useable. I remember a previous model had slighlty bigger transformer. All due to cost reduction.

....atp3 runs on tda7375 i think.... =)
12v to 14v 3 to 4a
if you use a lower than 3 to 4 it will greatly reduce your bass performance
especially on high volume but it will work =)
have fun, but if you are noob at this... get someone with experience to change the high voltage section for you... you might get kill if not careful

finally changed my 4121 with TDA7375 amp. with 12V voltage regulator.
3x3300uF and 2x0.1uF WIMA power filter. woohooo...
finding suitable sub driver to change ...