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» Film-Tech Forum   » Community   » The Afterlife   » 6 channel to hdmi adapter?

   
Author Topic: 6 channel to hdmi adapter?
Louis Bornwasser
Film God

Posts: 4426
From: prospect ky usa
Registered: Mar 2005


 - posted 08-13-2014 01:36 PM      Profile for Louis Bornwasser   Author's Homepage   Email Louis Bornwasser   Send New Private Message       Edit/Delete Post 
I have 6 channel analog on RCA plugs that needs to convert to hdmi. The hdmi receiver is used in a cry room situation. "New" receiver does not have analog inputs for more than 2 channels.

Does anyone make such a device?

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Carsten Kurz
Film God

Posts: 3681
From: Cologne, NRW, Germany
Registered: Aug 2009


 - posted 08-13-2014 04:16 PM      Profile for Carsten Kurz   Email Carsten Kurz   Send New Private Message       Edit/Delete Post 
I haven't seen them with discrete multichannel audio inputs. One solution could be an SDI-Audio Embedder followed by an SDI-HDMI converter. Could be in the 300-500US$ range.

Stereo HDMI Audio Embedders can be bought cheaply.

Typically, these embedders need a valid video signal at an input, as there is no audio-only HDMI transmission. Some have a built-in black generator if audio-only conversion is needed.

Do a search for SDI or HDMI 'audio embedders'.

There is an expensive digital-only (4/8ch AES-> HDMI) converter available from Arvus. Although I am not sure wether it was actually really available, it looked like a vapour-ware product for a while. I have seen quotes around 1200US$.

- Carsten

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Frank Angel
Film God

Posts: 5196
From: Brooklyn NY USA
Registered: Dec 1999


 - posted 08-13-2014 08:12 PM      Profile for Frank Angel   Author's Homepage   Email Frank Angel   Send New Private Message       Edit/Delete Post 
Lou, do you really need 6 channels in a cry room? Wouldn't stereo do? After all, babies in there are for the most part wailing.

A theatre I worked years ago had a cry room; we ran lots of 4trk mag, and they just got a LCR mix-down to mono.

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Louis Bornwasser
Film God

Posts: 4426
From: prospect ky usa
Registered: Mar 2005


 - posted 08-15-2014 07:11 AM      Profile for Louis Bornwasser   Author's Homepage   Email Louis Bornwasser   Send New Private Message       Edit/Delete Post 
They are repurposing the room as an adult beverage room and $20 tickets. (No, I think it will be a disaster as well) Still that is what they want.

Older home receivers have the 5 RCA jacks on the back. The plan was to just buy a new one. Guess what? They are now all-hdmi. No RCA plugs except of real cheap stuff.

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Alan Gouger
Master Film Handler

Posts: 474
From: Bradenton, FL, USA
Registered: Jul 2000


 - posted 08-15-2014 07:53 AM      Profile for Alan Gouger   Author's Homepage   Email Alan Gouger   Send New Private Message       Edit/Delete Post 
Not RCA analog input but....
http://aes-hdmi.com/aes-2h.html

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Carsten Kurz
Film God

Posts: 3681
From: Cologne, NRW, Germany
Registered: Aug 2009


 - posted 08-15-2014 08:42 AM      Profile for Carsten Kurz   Email Carsten Kurz   Send New Private Message       Edit/Delete Post 
I just bought a used Marantz AV receiver on ebay. It has analog discrete inputs and outputs, with basic mixdown options if less than an 5.1/7.1 speaker config is used.

I payed around 400US$ for it. And that is still a higher class model (SR5007). Sure you could get something similar for even less money. Where does the analog 5.1 audio come from?

- Carsten

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Louis Bornwasser
Film God

Posts: 4426
From: prospect ky usa
Registered: Mar 2005


 - posted 08-16-2014 10:06 AM      Profile for Louis Bornwasser   Author's Homepage   Email Louis Bornwasser   Send New Private Message       Edit/Delete Post 
It is a resistive mixdown from the main bi-amp outputs of the cinema amplifiers. EQ in room is quite gentle. 3x8330 for "window" speakers and 2 small speakers for surrounds.

I had thought about the output of the CP-500, but I did not want it outside the booth where any moron could kill screen sound. The system sounds quite good, but is currently running on a 16 year old system that has a channel missing.

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Carsten Kurz
Film God

Posts: 3681
From: Cologne, NRW, Germany
Registered: Aug 2009


 - posted 08-16-2014 08:16 PM      Profile for Carsten Kurz   Email Carsten Kurz   Send New Private Message       Edit/Delete Post 
Hmm, you could feed the output of the CP500 through a couple of split transformers/DI-Boxes, so the main screen sound would be safe. But anyway, a suitable AV receiver should do the job. I just recently did a search for units with discrete multichannel analog ins, and still found a few. Mentioned Marantz receivers have suitable amps for 8330 and can be bought new for around 500-700US$. It's a compact solution then. One unit, one volume control, basic options for EQ, etc., and alternative inputs. They even have RS232 and could be automated from the booth if needed.

There is a difference, though between units - some just offer a sideway into the main amps, bypassing all other inputs, EQ, etc., while some have the analog multichannel inputs added as a regular input source, with channel mapping, EQ, delay, etc. The Marantz receivers do it that way, while I think the Yamahas RV have very limited processing available for the multichannel inputs.

- Carsten

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Louis Bornwasser
Film God

Posts: 4426
From: prospect ky usa
Registered: Mar 2005


 - posted 08-17-2014 07:26 AM      Profile for Louis Bornwasser   Author's Homepage   Email Louis Bornwasser   Send New Private Message       Edit/Delete Post 
Audio in, volume control, and amplifiers will do it. I think they bought a Marantz off of Amazon. Many thanks.

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