Yes

Mmm... I want to understand more clearly on what you want here. Its confusing without enough info.

Ok... I will make assumptions here so do correct me if its not what you want.

Assumption 1
If you want to use RCA audio out from TV to your speakers, then not possible when RCA Analog Stereo out is not available on TVs. Normally there are TVs (not all) which do have Optical Audio out or (maybe) Co-axial out which allow connection to an AVR. Connecting Opt Out in this way allows a "smart TV" with internet browser or online apps (Netflix) to output sound to the AVR instead of only the TV speakers.

Assumption 2
Mmm... bluray players now already do not have RCA analog stereo out to connect to any AVR or active speakers.

When you say "using my external speaker connecting to RCA"... you meant your speakers are "Active" ones which have its internal amp and can accept input directly from source players.

Assuming your "old" player have analog RCA stereo out, you want to connect...
"bluray or DVD player" HDMI >> directly to your TV.
Same "bluray or DVD player" RCA out connect to "active" external speakers.

Yes, you can when active speakers are used. No, when passive speakers are used, that need an AVR or Pre+Power Amp.

If correct, I assume that you do not have an AVR. So you want to use your player to use your external speakers instead of sound from your TV. I guess you set your player to decode audio as "PCM" out (not bitstream). Mmm... you want better sound from your speakers instead of your TV when playing DVD, bluray, etc.

Assumption 3
You have an older Astro Decoder which have analog RCA Stereo Out.

You don't want to use any AVR. You just connect Astro HDMI directly to TV and then Astro RCA out to your active external speakers. The Astro "Digital Audio" settings must use "Stereo (Analogue and Digital). So you want better sound for Astro by using your external speakers, not from TV speakers.

Yes, you can. Obviously no 5.1 surround audio for 2 external speakers.

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If none of the above, then please let me know in more detail such as...
(1) what player or source is used?
(2) player connect to what?
(3) is there any TV out connection?
(4) active or passive speakers?
(5) is there any AVR used?
(6) what is the purpose you want to use HDMI for video and RCA for audio?

If possible, it will help by drawing a simple diagram showing all the hardware connections that you want.

You can use your Astro decoder HDMI out to TV for the video... and Astro RCA (Red and White) out to external speakers for the audio. Astro digital audio setting must NOT use "Dolby Digital 5.1 (Digital only)" which will cause no audio out from the decoder RCA.



If you want to connect "anything" to your speakers RCA, whether can or cannot will depend on the source (Astro, AppleTV, DVD Player, CD Player, etc)

That AppleTV or any other source must support RCA stereo output and its setting must be set to Analogue Stereo. Do not set source audio to Digital or Bitstream.

If the source output audio ONLY in Digital 2.0 or 5.1 or 7.1... then cannot use RCA. Must change source setting to decode and change the digital audio to analogue stereo.

When your 2 stereo (Active Type) speakers with builtin amp only have 2 stereo RCA In, then you can only get sound from the source Stereo Analogue.

5.1/7.1 Active Type External Speaker System (with or without builtin Dolby Digital decoding)
If you want better sound from the Active type speakers, get a 5.1 external speaker system with Optical/Co-axial Digital Input. If the source (AppleTV, Astro, etc) have Optical/Co-axial Out, then it can connect to the 5.1 speakers using just 1 cable. Many reasonably cheap 5.1 speaker types can be found in PC shops (Lowyat Plaza). If the 5.1 Speakers do not support Dolby Digital and/or DTS, the source audio setting MUST set to decode audio as "Analogue".

For Astro, no point getting 5.1 external active type speaker system. When Astro decoder is set to "Dolby Digital 5.1 (Digital only)"... no sound out from Astro Co-axial. Setting to "Stereo (Analogue and Digital)" is only 2 channels. My Astro PVR do have 1 Co-axial Out but I don't know if the new ones have Co-axial or Optical out or not.

You are welcome. Mmm... my problem is usually writing too long explanations or comments. Bad habit.

Good or bad depends on how each person thinks. I respect that. Anyway, when it works, I "believe" the audio should be better than the TV internal speakers. Yeah, you expect the same too.