Preamp Stage L, R, L+R

[Havenwood]

Hi, what think about this preamplifier stage?



I use the Silicon Chip preamplifier.


The stage L+R is ok? can be improved?


I´m doing a 3.1 sound sistem.
Greetings

[Nrik]

Project is approved.

...but don't you mean a 2.1 system?

[Havenwood]

Hi, I forgot...
My sistem is 3.1

Left - Center (L+R) - Righ - Woofer (Active Filter Elektor)

the stage L+R, is not very simple that stage? or this so well?
Noise and interference on HF. How can I avoid them?

when I turn on dvd to hear music, I hear a faint hum in the Center Stage...

Greetings

PD:my English is not quite good

[Havenwood]

What thinks about this preamp class A with IC (TL081)?
Based on this circuit this page:
http://www.users.otenet.gr/~athsam/class_a_amp_ic.htm

Is better than the SiliconCHip?

I have simulated in Multisim and obtained the following measurements:

Iq1,2 = 44.15mA => V(r7/r6) = 442,63mV
Voffset = 33.032mV

Can I adjust the offset?
Can be improved?

[Havenwood]

Multisim.

I would appreciate your views.
Greetings