Removing excess PCB s from an AVR to make it a stereo amplifier ?

[rwnano]

I have AVR s which I used front left and right channels for audio 2.1 listening..how do I remove the excess PCB s , say for video processing etc...that are not needed, such that I get closer to a stereo amplifier sound?

 

[mbhangui]

Download the service manual for the avr. Study the schematics and the connections between the boards. Usually these boards are connected to one another by a multi-wire ribbon cables or multi-wire socket connections.

There is a simpler method. Most AVRs also have a Pure Direct connection. In Yamaha AVR it is called Pure Direct mode. Other AVRs will have other names for it. Pressing the Pure-direct button the remote/avr turns off digital boards and all surround channels and the subwoofer and the avr transforms into a pure stereo mode amp.

 

[rwnano]

In my Harman kardon AVR, "surround off" is this mode. It enables 2.1 though, not only 2.0

 

[rwnano]

Bhangui sir...what happens internally when you turn the balance tone knob all the way to one side ?

 

[mbhangui]

Surround off still has the DSP enabled. Can you check the manual

 

[mbhangui]

Bhangui sir...what happens internally when you turn the balance tone knob all the way to one side ?

That doesn't turn off the amp. It just changes the resistance in a voltage divider circuit to direct more of the input to one amp rather than dividing equally.

 

[mbhangui]

See this note from HK https://support.harmankardon.com/us...-surround-mode-functions-do-us/000028148.html

 

[rwnano]

That doesn't turn off the amp. It just changes the resistance in a voltage divider circuit to direct more of the input to one amp rather than dividing equally.

In reference to my dual monoblocks with AVR experiment...will using the same work like a monoblock or should I just put the balance at center

 

[mbhangui]

No potentiometer is perfect except at the extreme positions or at the exact middle position. If I embarked on such a difficult journey, I would use the balance control at the center.

 

[Amarendra]

I have AVR s which I used front left and right channels for audio 2.1 listening..how do I remove the excess PCB s , say for video processing etc...that are not needed, such that I get closer to a stereo amplifier sound?

I am currently using my Pioneer LX302 in pure direct stereo mode. Works very well as a stereo amp. Removing excess boards could force the AVR in shut down/ stand by mode. I had tried disconnecting the preamp and power amp in my earlier Denon AVR but the AVR would go into standby.

 

[Passive_audio_enthusiast]

Depends on how the AVRs is designed. Some would not go beyond standby, if any of the boards are missing/faulty. Some would have a Analogue to digital converter for all analogue inputs for using a digital volume control.

 

[Passive_audio_enthusiast]

In reference to my dual monoblocks with AVR experiment...will using the same work like a monoblock or should I just put the balance at center

Do you have two identical AVRs?

 

[rwnano]

Do you have two identical AVRs?

Yes

 

[anuragn]

All modern AVRs are microprocessor controlled (i.e. computer controlled in layperson's language) and they have lots of built-in interlocks and trips for protection, implemented through software. So we cannot remove any PCB just like that. Only way is to study the schematic circuit and then rewire the analogue inputs (L & R) directly through the preamp and then to input of power amp. The speaker protection relays would also need to be bypassed by connecting a wire parallel to them.
Actually, if one has time, then it would be an interesting DIY project

 

[availlyrics]

@anuragn
I was goimg to type the same

@rwnano
please don't mess with the controller board. Instead build amp from scratch/kit or buy dud HT setup and experiment. I'm trying to do the same with HT saved from going to junkyard

 

[sandeepmohan]

I have AVR s which I used front left and right channels for audio 2.1 listening..how do I remove the excess PCB s , say for video processing etc...that are not needed, such that I get closer to a stereo amplifier sound?

All AVR's deliver good Stereo sound. You are not doing to gain any benefit from this whole, over complicated exercise. If this is purely a hobby/experimental thing, then go for it. Don't expect the unit to sound any better just because you pulled out a bunch of video processing cards.

 

[KNRAMU]

All modern AVRs are microprocessor controlled (i.e. computer controlled in layperson's language) and they have lots of built-in interlocks and trips for protection, implemented through software. So we cannot remove any PCB just like that. Only way is to study the schematic circuit and then rewire the analogue inputs (L & R) directly through the preamp and then to input of power amp. The speaker protection relays would also need to be bypassed by connecting a wire parallel to them.
Actually, if one has time, then it would be an interesting DIY project

I tried this with my Harman kardon avr165 & Anthem mrx 500 and ended up with speaker woofer coil burnt.

 

[rwnano]

What about my dual monoblocks experiment with a
Two AVR s?

 

[Passive_audio_enthusiast]

What about my dual monoblocks experiment with a
Two AVR s?

Buy it, it will be worth it. Now that you have the answer. Do it and let us know, how good the improvement was.