TDA7293 Parallel kit from ebay (modular/slave style, no lossy emitter resistors)

[Freedom666]

I wanted to know is it difficult to transform this chip amp TDA7293 from voltage drive to current drive?

Saw that one modified this chip amp to current drive - with pictures and measurements (german language):

https://www.aktives-hoeren.de/viewtopic.php?f=16&t=1427&start=45

 

[chienmort]

Why do you want to do it?

 

[Freedom666]

I tried it with TDA2003 with good sonic results for my fullrange drivers I use.

TDA7293 is a more powerful chip.

 

[Berlusconi]

TDA7293 is a more powerful chip.

But, unfortunately, TDA2003 also has higher THD values. Actually, above 0.1 percent and, according to definition it is not Hi-Fi.
Everyone can decide for himself.

 

[Freedom666]

Current drive and/or current feedback brings all distortion down in the loudspeaker due to magnet and voice coil assembly. Usually by 10 to 20db. So an amp with 0.1 per cent distortion can sound better in combination with a speaker than a better chip with voltage drive.

 

[Kay Pirinha]

I just don't get why you want to drive a loudspeaker from a high impedance source. Speakers usually (I don't know any other...) are designed to be driven from impedances as low as possible. High impedance means low to non existing damping. Hence, what you perceive as better sounding, most probably are non controlled, sloppy, boomy bass frequencies. Quite the opposite of high fidelity.

Best regards!

 

[bebo65]

current drive is the correct way to drive speakers, but the speakers need to be designed for it. Here is a thread that puts some light on it:

https://www.diyaudio.com/community/threads/help-to-understand-current-drive.390405/

and here is another one that shows the idea for a TDA7294 composite amp designed for current drive (german language):

https://www.aktives-hoeren.de/viewtopic.php?f=37&t=1492

Gruß
Bernd