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| Rotel RA-820A taking care of the Front Channel over Pionner VSX-921 |
Let's look inside the beast :
- The green PCB is the Digital I/O board
- On the upper left corner, when can see the power supply.
- Of course the large radiator is covering the power amplifier board.
- The audio Signal processors and analog I/O are under the green PCB.
Let's find the pre-out signal !
We are looking for the pre-amp signal in order to extract it and feed a better amplifier. So we just have to find the wires between the DSP/Analog board and the amplifier...
Bingo ! Too bad we can't exactly see what's written ... But sure it's here !
Now let's find a convenient way to solder a bunch of RCA plugs... You will have to unscrew one support board and remove three plugs to access it ... no big deal!
Found it! A quick soldering and here we go, the left channel is available !
FYI :
1 : Front Left
2 : Gnd
...
9 : Front Right
10 : Gnd
The two main channels are extracted, let's pu everything back in place and enjoy the cristal clear sound out of a real amplifier !
Here we go !
Next post will be a small but usefull tip how to use Pioneer's VSX-921 integrated amplifier to drive a passive subwoofer (or bi-amp).
hi!
ReplyDeletedid this yesterday. now it wont power on, and adcvanced mcacc is blinking. do you know what the problem can be?
I'd recheck all the connectors carefully.
DeleteNice work! Does the VSX-921 still have volume control over the Rotel amp? Thinking of doing the same with my VSX-922 and Pioneer A-70 amp. Need to reduce the speaker count in my living room :)
ReplyDeleteYep it did. (That was many years ago now !) Setup the Rotel amplifier to a fixed ~60% volume
DeleteHi,Do I have to disconnect the original the FL and FR wires that go to the power amp board and then solder the preout leads or just piggyback solder the preout leads onto the same connection point as the original wires?Thanks!
ReplyDeleteI just piggyback'd them. What are you planning to use as an external amplifier ?
ReplyDeleteHi can I ask the connector in photo 3 (on the DSP board) what the order of signal wires is? Have you numbered them top to bottom? The top wire being 1, bottom wire being 13?
ReplyDeleteI don't remember the order but you can find out by playing a test tone while measuring pins voltage with a multimeter. (That's how I found out which one were front left and front right)
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