hi
i wanna ask what`s the reason behind distorted bass at a little high volume . i built a tda7294 bridge amp with pre amp TLo72 it sounds great even at high volumes but bass isn`t deep enough so,i decided to use a tone control circuit based on tda1524a the production of bass is now deep enough at low volume but at a little high volumes it became distorted although i am using 25-0-25 10amp. transformer with 22000 mf per rail . is the reason behind this distortion is the type and wattage of speakers _as i am using two 8" brandless speakers -??
i wanna ask what`s the reason behind distorted bass at a little high volume . i built a tda7294 bridge amp with pre amp TLo72 it sounds great even at high volumes but bass isn`t deep enough so,i decided to use a tone control circuit based on tda1524a the production of bass is now deep enough at low volume but at a little high volumes it became distorted although i am using 25-0-25 10amp. transformer with 22000 mf per rail . is the reason behind this distortion is the type and wattage of speakers _as i am using two 8" brandless speakers -??
When you use the tone control to get more bass, that means that the signal level of the low frequencies is much higher than the overall signal level.
Therefor, when you turn up the level, the low freqs are the first that get to the max output signal level of the amp and the amp will clip the low freqs. That causes the distortion.
Increasing the wattage or amperage of the transformer or the value of the caps doesn't help; the only thing that helps is either speakers with higher efficiency (they sound louder with the same signal level) or an amp that can deliver more signal level - which in practise means higher supply voltage meaning a higher power amp.
What enclosure are the speakers in?
jd
Therefor, when you turn up the level, the low freqs are the first that get to the max output signal level of the amp and the amp will clip the low freqs. That causes the distortion.
Increasing the wattage or amperage of the transformer or the value of the caps doesn't help; the only thing that helps is either speakers with higher efficiency (they sound louder with the same signal level) or an amp that can deliver more signal level - which in practise means higher supply voltage meaning a higher power amp.
What enclosure are the speakers in?
jd
Yes, good point! That may trigger the protection systems (which will sound bad).
Maybe a solution is to 'unbridge' the amp and let each amp drive one 8 ohms speaker.
jd
I looked at the datasheet at http://www.st.com/stonline/books/pdf/docs/1057.pdf. It says:
It seems like a better idea to use each chip to drive one 8" speaker, as suggested by janneman.
It seems like a better idea to use each chip to drive one 8" speaker, as suggested by janneman.
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.