diy amplifier for sony ss-rv900 pair of speakers

[sarathssca]

Hello,

I got a pair of sony ss-rv900 speakers (3 way speaker ,bass reflex box) from a Hi-fi setup which is not working well now. Could you please help in building an amplifier for these speakers?

While searching I could only get the below specifications:
The speakers are of 6 ohms each.
The hifi setup was rated as:
140+140 watts (6 ohms at 1KHz, 10% THD)
DIN power output (rated): 115+115 watts
Power consumption of the whole system is 220 watts
Also, opening the hifi setup I could see the circuit using ic STK442-130 which is rated as 150+150 w.

Could you please suggest what minimum wattage amplifier I could use to drive these speakers?
As the power consumption of the setup is rated as 220 watts, can I use a 50+50 watt amplifier to drive these speakers, using ICs like LM3886 or TPA3116 or TK2050?
Or do I need to use 100+100 watt amplifier to drive these speakers like TDA7498 etc?

Please suggest.

thanks and regards
S Sarath

 

[saheb11123]

any of the lm3886/3875/76/1875 tpa3116 ta2020 etc can drive there is no minimum wattage only inefficiency .
Now the question is what you want? lm3886 is powerful and sonically very good. this will suite your requirement very well. Now do you want to go diy or want a readymade soln

 

[sarathssca]

"any of the lm3886/3875/76/1875 tpa3116 ta2020 etc can drive there is no minimum wattage only inefficiency ."

Does it mean, any of those chips will drive the speakers but output wattage/sound volume will be based on the efficiency of the speakers ?

Currently I am thinking to get the application circuit from the data sheet or other sources, get the IC and other components and build it. Based on the complexity of the circuit will go for a general purpose PCB or have to make a PCB with the copper clad (normal etching process).
Also need to check if we need any changes to driver 6ohm speakers (as generally the circuits are for 4 or 8 ohms).

 

[saheb11123]

First : Yes any of these chips will drive the speakers and depending on output power of chip and efficiency of speaker the output will vary.

TI provides their general circuit in the datasheet of the chips that circuit is a full working model , if you want to build from scratch then i would recommend you follow that other you can visit diyaudiocart for kits of same ic's .

The circuit of these are not complicated and needs few external components.
output impedance is 4- 8 ohms meaning it can play 6 ohms pretty easily, take care when making supply . Dont exceed +/-35 v for 4oms speaker n +/- 50 v for 8 ohms.

 

[Aniket]

Hi,

why not go for a discrete amplifier design, if you are going the DIY way. any good discrete amplifier design would trash these chips amps on sonic quality.
There are numerous discrete amp designs in the 100W range. Rod Elliott's P3A is one such example. Its easy to build, needs less parts and sounds great.
I also have left over PCB's of my 100W amp, it would do ~150W on a 6 ohm load.
If your skills permit building a discrete amp is highly recommended.

Regards,
Aniket

 

[sarathssca]

Hi,

why not go for a discrete amplifier design, if you are going the DIY way. any good discrete amplifier design would trash these chips amps on sonic quality.
There are numerous discrete amp designs in the 100W range. Rod Elliott's P3A is one such example. Its easy to build, needs less parts and sounds great.
I also have left over PCB's of my 100W amp, it would do ~150W on a 6 ohm load.
If your skills permit building a discrete amp is highly recommended.

Regards,
Aniket

Hi Aniket,

But chip amps are supposed to be advanced tech, and would have amplifier and other supporting circuitry inside (like the short circuit protection etc).
So how would the discrete amplifier be better than the chip amps?
If so could you please provide some good discrete amp circuit design?

thanks and regards
S Sarath

 

[saheb11123]

This is basic fact that when you try to minimize design structure you will get some sort of drawback from the design, as in the case of a chipamp the chip contain all the important circuitry and few external components along with a psu can play music pretty easily, no the chip doesn't have speaker protection but, in TI's manual there is a way of avoiding pop sound(turn on mute included in general schematic).



Discrete design is more of core level stuff where the designer takes care of all aspects of design and by utilizing maximum quality stuff (which is not compressed in a silicon chip) the sound gets better.


Given you have time and energy and money and skill set to spare go for discrete design but if you are a begginer or you want to simply build a amplifier which will suit your needs and won't require much then gainclone / chiamp is the way.

My above statement doesn't by anyway means that chipamps are inferior to discrete designs, there are members who love chips more than discretes and vice versa.
So why don't you go with a chip design first see how much effort you can give and given after finishing you are not satisfied and gained experience building a amp then you can shift to a discrete design.

PS : Chipamp total build is much much less costly than discrete



Regards

 

[saheb11123]

Hi,

why not go for a discrete amplifier design, if you are going the DIY way. any good discrete amplifier design would trash these chips amps on sonic quality.
There are numerous discrete amp designs in the 100W range. Rod Elliott's P3A is one such example. Its easy to build, needs less parts and sounds great.
I also have left over PCB's of my 100W amp, it would do ~150W on a 6 ohm load.
If your skills permit building a discrete amp is highly recommended.

Regards,
Aniket

If you can Aniket sir, you can share details about your 100w amp like cost etc in this thread it will help this guy out along with other members as well





Regards
Soumyajyoti

 

[Aniket]

Hi Aniket,

But chip amps are supposed to be advanced tech, and would have amplifier and other supporting circuitry inside (like the short circuit protection etc).
So how would the discrete amplifier be better than the chip amps?
If so could you please provide some good discrete amp circuit design?

thanks and regards
S Sarath

If you can Aniket sir, you can share details about your 100w amp like cost etc in this thread it will help this guy out along with other members as well





Regards
Soumyajyoti

Hi,

I have already shared my 100W amp in the forum. more details could be found here : http://www.hifivision.com/diy/49939-100w-hifi-amp-9.html#post580153

Regards,
Aniket

 

[sarith]

lm3886 is powerful and sonically very good.

Hello, Just curious.. Have you compared LM3886 with TDA7293 or TDA7294. If you have, which is you think sounds best?

 

[saheb11123]

Hello, Just curious.. Have you compared LM3886 with TDA7293 or TDA7294. If you have, which is you think sounds best?

Sonically speaking in a good design the lm3886 sounds way better..
But for sub duty 7294 is way better