Surround Sound for car audio

[wuemura]

So, in alt-a what sugestions do you have?
Should i duplicate that circuit and connect that to ICb pin 5 or the modification that you have made is the way to go. I've did the second option because i did not understand your modification at the pot connection.

 

[audioguru2]

In your Alt-a, the pot connects to GND (negative opamp supply) instead of to the half-the-supply reference voltage, so the bias for both opamps change with setting the pot.
Also, R14 attenuates the signal to IC1B.

 

[wuemura]

Ok, got the idea, i will go by your design then.
Thanks.

 

[wuemura]

Hello guys!

Well i did a prototype version (no PCB yet), in my tests the circuit, well, it work some how the way i wanted, but for a very cheap circuit it will do.

Now i need some advice, i was reading a book named "Car Audio Secrets" that came with a "Time Alignment" schematic for the speakers (full text here), the link says that the sound will sound great and so on. It is true?

Just changing fases the way the schematic shows it will make my car sound system sound better? I did not test the schematic because it says that i will need just 2 channels, and my Head Unit have 5 (2 front, 2 rear, 1 sub) and i have 2 mosfet 4 Channel Power Amplifier.

If is all that good, there is a way to do it with electronics instead of wiring?

 

[audioguru2]

That article is wrong and messes up a car stereo. They just want you to pay $10.00 to see their simple schematic.
1) Connecting speakers in series doesn't change their phase 15 degrees or any other number of degrees.
2) Connecting speakers in series loses most of an amplifier's power.
3) With a subwoofer on one channel and "everything else" on the other channel then the sound is mono, not stereo and not surround sound.

 

[wuemura]

Thanks Audioguru

 

[wuemura]

Here is the final board and schematic for the circuit, i also included the project i've made with Eagle, enjoy!

Hafler.zip

Hafler.pdf