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 Post subject: Cheap AC3 to RCA Decoders on eBay
PostPosted: 27 Jan 2021, 20:22 
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Seeing some devices on eBay listed as AC3 to RCA decoders.

Are these AC3 demodulators? It looks to have the right inputs, but clearly are a new device. Just wanting to know if these are cheaper options than vintage demodulators.
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 Post subject: Re: CHeap AC3 to RCA Decoders on eBay
PostPosted: 27 Jan 2021, 20:38 
Young Padawan
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Please provide the link for the product. They are most likely not RF input.
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 Post subject: Re: CHeap AC3 to RCA Decoders on eBay
PostPosted: 27 Jan 2021, 20:52 
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Ah good point on the RF.

https://www.ebay.com/itm/AC3-DTS-Digital-Optical-Audio-To-5-1-Channel-Stereo-Analog-6-RCA-Converter-120dB/264172057434
https://www.ebay.com/itm/MOCHA-DTS-AC3-5-1CH-Audio-Digital-Sound-Decoder-Optical-SPDIF-Coaxial-to-6RCA-US/254844586085
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 Post subject: Re: CHeap AC3 to RCA Decoders on eBay
PostPosted: 27 Jan 2021, 21:18 
Jedi Master
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Wow, these would be cool if they do work.
The second one looks it but for 110 why not just get a tried and true decoder or AV with AC3 built in.
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 Post subject: Re: CHeap AC3 to RCA Decoders on eBay
PostPosted: 27 Jan 2021, 21:23 
Jedi Knight
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In China “AC-3” means DD 5.1. Also “SD” and “CRT” are often used interchangeably even though there are VGA CRTs and sub-VGA LCDs...

I’d be extremely surprised if these worked with RF. This is honestly more of a pro device, despite its puny price. Unless you’re throwing a full sized theater together on the cheap or building a tube state home cinema I don’t know why anyone these days would want to convert a digital signal to six line level ones. There is no affordable home gear that accepts analog surround from direct inputs anymore.

This is like the HK ADP-303 with the RF demod (the important part) missing.
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 Post subject: Re: CHeap AC3 to RCA Decoders on eBay
PostPosted: 28 Jan 2021, 02:28 
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dunerider wrote:
Ah good point on the RF.


They are AC3/DTS => 6 analog audio output (pre-amp).

You'd still need an AC3RF demodulator's output to be used as an input to this device.
Your A/V Amp most likely already does that.

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 Post subject: Re: CHeap AC3 to RCA Decoders on eBay
PostPosted: 28 Jan 2021, 14:10 
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What purpose would these serve? it seems unnecessary if you have an AVR.
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 Post subject: Re: CHeap AC3 to RCA Decoders on eBay
PostPosted: 28 Jan 2021, 14:25 
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xtempo wrote:
What purpose would these serve? it seems unnecessary if you have an AVR.


For small, self-powered speakers/mini sound-systems?

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 Post subject: Re: CHeap AC3 to RCA Decoders on eBay
PostPosted: 28 Jan 2021, 17:54 
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xtempo wrote:
What purpose would these serve? it seems unnecessary if you have an AVR.


An AVR can’t fill a big room. If you want 5.1 in a church, for example, you could run each line out to a powered PA. Theater equipment is probably still made this way since amps can be separate then. In the home they’ve been out of date since the early 2000s.
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