TDA7294 in BTL

[ruferto]

I have build one 4x TDA7294 in BTL mode to use in a sub, but i saw this in the tda datasheet .
My question is: is it any good for a subwoofer amp?

Best regards,
RUF

 

[madtecchy]

Do you have any problem with the sound from it ??

 

[ruferto]

No, only 50hz noise because of the bad psu, only TR+Caps.
But can it reach the 18HZ for example?
Is it strong enough to say "stop" a the Sub "stop"

regards,
Ruf

 

[norture]

No, only 50hz noise because of the bad psu, only TR+Caps.
But can it reach the 18HZ for example?
Is it strong enough to say "stop" a the Sub "stop"

regards,
Ruf

Well, for a start, have you got an appropriate sub for that 18Hz freq? It has to be big to handle such low frequency, though. The IC can surely handle sub-20Hz input signals. Regarding its power, I think 4xTDA7294 will shake your feet off the ground. LOL!

 

[ruferto]

I have for now one peerless xls10 in a sealed cab. but a think i am going to try or in TH or PASSIVE enclosure.
there are so many thoughts and one of them is, as i have one big 500va 2X25V~ i was thinking of buy another one and make one amp for 2 subs.
But i was not sure of the SUBwoofer capabilities of the amp.

regards,
RUF

 

[abraxalito]

It'll work fine for sub duty - you just will want to ensure the bootstrap capacitor is big enough to get good LF performance. Oh, and the drive unit would want to be an 8R type to get the most out of bridged mode.

 

[ruferto]

thank you.

I think i am going to buy one xlsp for my sub.

best regards,
RUF

 

[santitrucco]

Could one TDA7294 , to do 50hz o 60hz noise , because use 100uf bootstrap and 220uf NFB capacitors ?

Santiago

 

[asuslover]

Can you post a schematic of your sub amp? 4 tda7294 for each channel?

 

[santitrucco]

is not a sub amp, is only one TDA7294 per channel.

 

[Kay Pirinha]

Oh, and the drive unit would want to be an 8R type to get the most out of bridged mode.

I'm quite convinced that four TDA7294's (2 x 2 in parallel, as shown in the application notes) are quite apt to drive even 4 ohms loads. Proper heat sinking ist important with that, of course.


Best regards!

 

[abraxalito]

Yes, if you bridge and parallel then a 4R load isn't going to be a problem. My mistake for not noticing the 'X4' in the original post.

 

[nigelwright7557]

I am not sure I understand what you mean by BTL with 4 amps.
BTL is usually 2 amps.
Unless you have two channels ?
Or is it PBTL ?

 

[abraxalito]

Or is it PBTL ?

This.