hello guys!
I would like to ask you if it could be dangerous to connect with a low impedance value (3.2 ohm) old speakers to a small old amplifier based on the vintage I.C. TCA940.
I would like to specify that 3.2 ohms is not the resistance of the speaker but its actual impedance.
I also wanted to ask if by changing the tweeter with another one with an impedance of 8 ohms (and therefore also replacing the high-pass capacitor with another one with a greater capacity) I would be able to increase the general impedance of the whole speaker (at least) a little. Thank you very much. Best regards.
I would like to ask you if it could be dangerous to connect with a low impedance value (3.2 ohm) old speakers to a small old amplifier based on the vintage I.C. TCA940.
I would like to specify that 3.2 ohms is not the resistance of the speaker but its actual impedance.
I also wanted to ask if by changing the tweeter with another one with an impedance of 8 ohms (and therefore also replacing the high-pass capacitor with another one with a greater capacity) I would be able to increase the general impedance of the whole speaker (at least) a little. Thank you very much. Best regards.
If you choice the right supply voltage, 3 Ohm isn't an issue - check out the datasheet. I would use 12Vcc, max. 16Vcc.
Heat sink should be large enough - go to
https://www.zetabishop.it/Dissipatore-alluminio-per-TCA-940-SH-70
Here is an example from elektor.
https://www.elektormagazine.de/magazine/elektor-197307/55312
Check out service manuals of amp sections (mostly vintage televisions), where this IC is in use.
Please note: High quality of electrolytic capacitor (low ESR, e. g. Mundorf) behind the rectifier and large transformer are important for good sound.
Heat sink should be large enough - go to
https://www.zetabishop.it/Dissipatore-alluminio-per-TCA-940-SH-70
Here is an example from elektor.
https://www.elektormagazine.de/magazine/elektor-197307/55312
Check out service manuals of amp sections (mostly vintage televisions), where this IC is in use.
Please note: High quality of electrolytic capacitor (low ESR, e. g. Mundorf) behind the rectifier and large transformer are important for good sound.