req help in selecting audio amplifier IC for home 2.1 speakers

[sarathssca]

Could you please help in choosing a audio amplifier IC for building DIY home speakers (2.1 system)?

Whether to go for class AB amplifier like LM1875 or TDA7295. Or go for a class D/T amplifier like TPA3116 or TA2020 or TK2050 etc.

Looking at the datasheets of these class-AB and class-D amplifiers, the performance are looking similar, referring the graphs for THD+noice vs frequency and output power etc.
For all of these the THD was at least below 0.1% across the output power values under the given max for the chip. "THD vs Frequency" graphs were more smoother for TK2050, and LM1875 and on TPA3116 graphs THD was bit higher at around 5KHz region.

From what I have read, class-D is more efficient and so I may have a smaller power supply driving it and will have smaller or no heat sink. Thus a overall compact and small amplifier will result. But heard they have some EMI issues.

On the other hand with class-AB amplifier, sound quality will be very good and not sure if these currently available class-D amplifier are producing such sound quality. But they need bigger power supply as they are less efficient, and need a bigger heat sink, so overall it will be bit bulky.

Please help in selecting the suitable amplifier IC for DIY 2.1 channel home speaker system.

thanks and regards

S Sarath

 

[DesiPower]

What will you be using it for?

What is you budget?

What kind of speakers and sub are you planning to use?

 

[exar333]

What will you be using it for?

What is you budget?

What kind of speakers and sub are you planning to use?

This, need more info.

I would personally go for a Class D for the sub and a type AB 2-channel for the R/L speakers. This would give you flexibility to get the right power for your DIY sub and the right power for the 2.0 channels as well.

 

[sarathssca]

Hello,

I am trying to build is for home purpose, to connect it to my TV for movies and to my mobile for songs.
My TV is having 10w+10w speakers and if raised to high volume it gets sufficiently loud. So thinking a 20w+20w+20w speaker system will be sufficient. Please comment if my understanding on watts required is ok.

Regarding the power supply for the amplifier, thinking if i can use the 65w, 19.5v laptop power supply. Is it ok or its better to go for transformer based linear power supply?

Regarding speakers, I was thinking to use car speakers, as here we can get branded car speakers like from JBL, sony etc, with 4ohm, rms 30w, and 90 - 93db sensitivity (which seems to be good sensitivity which will give loud sound with relatively less power). With branded speakers we may trust the quality of the speakers

thanks and regards
S Sarath

 

[DesiPower]

well, tbh I have no idea about that level of DIY systems, the 1st question that comes to my mind is how will you box the amps and the speakers? or the aesthetics do not concern you? Without proper boxing will the speakers still sound good?

If the price is the concern, you can always look at craigslist or local garage sale and you will find old avr for $50 or less, you can use those as amps... and you can buy Sony or Yamaha pair for around 70...

 

[sarathssca]

Could you please provide some info regarding speakers for DIY home speaker system in India (chennai)?
While looking for speakers I could find sony/JBL car speakers with 30w RMS, 90-93db sensitivity. But looking at different fourms and sites, it seems car speakers are not suitable for home use.
Will car speakers work well for home speakers with good encloser?
Could you please suggest some good speakers for home speaker system, available in India?

thanks and regards
S Sarath

 

[marincounty]

Car speakers will not work well for you at home. Maybe you can find some Peerless India speakers?
You can buy cheap chip amplifiers on Ebay, LM3886 is popular as well as LM1875.