| Author |
Message |
virusc
Joined: 11 Apr 2007
Posts: 358
Location: Massachusetts
|
| Posted: Tue Aug 31, 2010 3:00 pm Post subject: How to add a 6 channel input to a preamp, Can I do it? |
|
|
Hi,
I am not ready to upgrade my preamp yet and my DTS in my citation 5.0 preamp does not like the max 1506mbps stream that all of the BluRay players output so I was thinking maybe I can hack my old HK DD decoder to have a 6 channel input. It has a bypass 6 channel input and preamp outputs so I was thinking is it as simple as tapping the analog 6 channel out after the D/A chip or are they integrated? Do I need to put in a inline resistors or anything?
BTW, I don't care if I destroy the HK decoder, its a ADP303
|
|
| Back to top |
|
 |
macgyver655
Joined: 22 Aug 2007
Posts: 8508
|
| Posted: Tue Aug 31, 2010 10:24 pm Post subject: Re: How to add a 6 channel input to a preamp, Can I do it? |
|
|
| virusc wrote: | Hi,
I am not ready to upgrade my preamp yet and my DTS in my citation 5.0 preamp does not like the max 1506mbps stream that all of the BluRay players output so I was thinking maybe I can hack my old HK DD decoder to have a 6 channel input. It has a bypass 6 channel input and preamp outputs so I was thinking is it as simple as tapping the analog 6 channel out after the D/A chip or are they integrated? Do I need to put in a inline resistors or anything?
BTW, I don't care if I destroy the HK decoder, its a ADP303 |
I'm not quite understanding what you want to do. Can you be more specific?
|
|
| Back to top |
|
|
greg_mitch
Joined: 03 May 2006
Posts: 5320
|
| Posted: Wed Sep 01, 2010 2:38 am Post subject: |
|
|
I think he is saying he wants to take his old HK and use it as a decoder inline between the BR player outputs and his older preamp inputs? Sounds like it anyway.
Sounds like a challenge for Mac for sure.
|
|
| Back to top |
|
|
macgyver655
Joined: 22 Aug 2007
Posts: 8508
|
| Posted: Wed Sep 01, 2010 3:02 am Post subject: |
|
|
| greg_mitch wrote: | I think he is saying he wants to take his old HK and use it as a decoder inline between the BR player outputs and his older preamp inputs? Sounds like it anyway.
Sounds like a challenge for Mac for sure. |
Thats what has me confused. It already has 6in/6out, processed or bypass.
| Description: |
|
| Filesize: |
165.74 KB |
| Viewed: |
13004 Time(s) |
|
|
|
| Back to top |
|
|
greg_mitch
Joined: 03 May 2006
Posts: 5320
|
| Posted: Wed Sep 01, 2010 3:11 am Post subject: |
|
|
|
Hmm...looking at that photo it appears he doesn't need to hack anything.
|
|
| Back to top |
|
|
virusc
Joined: 11 Apr 2007
Posts: 358
Location: Massachusetts
|
| Posted: Wed Sep 01, 2010 10:55 am Post subject: |
|
|
the 6 channel input is a pass through only and does not go to the preamp circuit so I need to tap the signal after the DD chip I guess.
the purpose is to use a 6channel out of a blu ray for the new audio formats without hacking my current preamp
I need to add a 6 channel input that can be preamped by the decoder box. I guess it will be a poor mans Theta 6 shooter is what I am trying to do.
|
|
| Back to top |
|
|
macgyver655
Joined: 22 Aug 2007
Posts: 8508
|
| Posted: Wed Sep 01, 2010 1:34 pm Post subject: |
|
|
| virusc wrote: | the 6 channel input is a pass through only and does not go to the preamp circuit so I need to tap the signal after the DD chip I guess.
the purpose is to use a 6channel out of a blu ray for the new audio formats without hacking my current preamp
I need to add a 6 channel input that can be preamped by the decoder box. I guess it will be a poor mans Theta 6 shooter is what I am trying to do. |
Edit: Any "analog" signal carrying non amplified audio is preamp. Set top boxes analog output is preamp out without a volume. The decoder part of your HK merely separates digital multi channel carrier signals and has crossovers. The 6 channel input is already separated which is why its pass through.
What type of connections from your Blu Ray or whatever else were you considering?
What were you then going to connect the HK to on the output side?
|
|
| Back to top |
|
|
virusc
Joined: 11 Apr 2007
Posts: 358
Location: Massachusetts
|
| Posted: Wed Sep 01, 2010 2:15 pm Post subject: |
|
|
I want to add a 6 channel fixed input (1-2v) to the ADP303 that would then go to the variable volume preamp circuit part of the ADP303. The ADP sits between a Multichannel preamp (citation 5.0) and the amplifiers. In bypass mode the ADP does not modify the 6 channel input. It was a fairly transparent solution back in the day when it was made to go in between prologic only preamps to add Dobly Digital decoding to systems without having to replace the preamp. I guess you could call it a Dobly Digital decoder with preamp only for the decoder with a additional bypass input.
Sorry for the confusion. Does this clear it up? I hope that this will allow me to wait a little while before upgrading to a modern preamp as I do not have the funds now and other than not having the newest decoding formats I am fairly happy with the Citation setup I have.
|
|
| Back to top |
|
|
macgyver655
Joined: 22 Aug 2007
Posts: 8508
|
| Posted: Thu Sep 02, 2010 12:06 am Post subject: |
|
|
| virusc wrote: | I want to add a 6 channel fixed input (1-2v) to the ADP303 that would then go to the variable volume preamp circuit part of the ADP303. The ADP sits between a Multichannel preamp (citation 5.0) and the amplifiers. In bypass mode the ADP does not modify the 6 channel input. It was a fairly transparent solution back in the day when it was made to go in between prologic only preamps to add Dobly Digital decoding to systems without having to replace the preamp. I guess you could call it a Dobly Digital decoder with preamp only for the decoder with a additional bypass input.
Sorry for the confusion. Does this clear it up? I hope that this will allow me to wait a little while before upgrading to a modern preamp as I do not have the funds now and other than not having the newest decoding formats I am fairly happy with the Citation setup I have. |
So you have a citation with preamp outs and separate amps and you want to put the ADP in between to "modify" the signal, correct?
What part of the HKs signal modifying are you hoping to be able to use?
I'm looking at the schematics and need to know what features your hoping for, to see if we can tap into that location. Plus some features are controlled in the digital section and would not be accessible unless you input a digital signal.
|
|
| Back to top |
|
|
ecrabb
Forum Moderator
Joined: 13 Mar 2006
Posts: 15909
Location: Utah
TV/Projector: JVC RS40, Epson 5010
|
| Posted: Thu Sep 02, 2010 1:56 am Post subject: |
|
|
Mac, unless I'm misunderstanding him, he just wants the volume control on the ADP-303 to attenuate the signal from the 6-ch input before it hits the amplifier(s). As it is, the 6-ch pass through must just be a direct 1:1 pass-through (no volume control).
SC
|
|
| Back to top |
|
|
AnalogRocks
Forum Moderator
Joined: 08 Mar 2006
Posts: 26706
Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
|
| Posted: Thu Sep 02, 2010 4:31 am Post subject: |
|
|
That's the way I read it too. I have a Yamaha that does that.
_________________
Tech support for nothing
CRT.
HD done right!
|
|
| Back to top |
|
|
virusc
Joined: 11 Apr 2007
Posts: 358
Location: Massachusetts
|
| Posted: Thu Sep 02, 2010 11:20 am Post subject: |
|
|
Ecrabb is right. The 6ch input uses some sort of relays to create a true passthru. The only signal modification the box offers after the DD decoding is it has some trimmers for each channel to adjust the gain seperately before the master volume control. I just want to tap the analog audio before it goes to the attenuator stage. Would any other components be required like inline resistors or do you think or will be a straight tap?
thanks,
|
|
| Back to top |
|
|
macgyver655
Joined: 22 Aug 2007
Posts: 8508
|
| Posted: Thu Sep 02, 2010 12:36 pm Post subject: |
|
|
| virusc wrote: | Ecrabb is right. The 6ch input uses some sort of relays to create a true passthru. The only signal modification the box offers after the DD decoding is it has some trimmers for each channel to adjust the gain seperately before the master volume control. I just want to tap the analog audio before it goes to the attenuator stage. Would any other components be required like inline resistors or do you think or will be a straight tap?
thanks, |
Ok. I think I have it. We can probably get you the volume control but the channel trimmers are after that so they would probably be included. Just put them all on full and it would be like they are not there.
You will have to be my eyes. See if you can find a board marked PD04. Then find connector PD05 and is that a wire harness at that connector.
Doesn't the Citation have a volume control?
|
|
| Back to top |
|
|
macgyver655
Joined: 22 Aug 2007
Posts: 8508
|
| Posted: Thu Sep 02, 2010 12:43 pm Post subject: |
|
|
| virusc wrote: | The only signal modification the box offers after the DD decoding is it has some trimmers for each channel to adjust the gain seperately before the master volume control.
It also has individual channel crossovers.
I just want to tap the analog audio before it goes to the attenuator stage.
Does this mean inject preamp audio before the volume control?
thanks,
I'm being very picky and specific because I need to know exactly what your trying to accomplish to determine where to try the tap.
|
|
|
| Back to top |
|
|
virusc
Joined: 11 Apr 2007
Posts: 358
Location: Massachusetts
|
| Posted: Thu Sep 02, 2010 2:08 pm Post subject: |
|
|
I forgot about the crossovers. Are they analog? I think I would need them to divert the front channel low bass to sub channel. Other than that I would like to inject the 1-2.0v signal directly from a 6channel good quality Blu Ray player. Actually now that I think about it. Do Blu Ray players with 6channel built in decoder output have bass management usually anyway? if they do I guess I could inject the signal after the crossovers. I need the attenuation of the volume control circuit to drive the amps otherwise the gain will be fixed to whatever the bluray player is outputting. In reality I think I am trying to make a poor mans Theta six shooter. Actually these things are so cheap maybe others would find this useful I hope, if we get it working.
thanks,
Nate
|
|
| Back to top |
|
|
ecrabb
Forum Moderator
Joined: 13 Mar 2006
Posts: 15909
Location: Utah
TV/Projector: JVC RS40, Epson 5010
|
| Posted: Thu Sep 02, 2010 2:20 pm Post subject: |
|
|
| virusc wrote: | | Other than that I would like to inject the 1-2.0v signal directly from a 6channel good quality Blu Ray player. Actually now that I think about it. Do Blu Ray players with 6channel built in decoder output have bass management usually anyway? if they do I guess I could inject the signal after the crossovers. |
Yeah, Nate - Any decent BD player with analog outputs is going to have adequate level matching, bass management, and distance controls, so it would be ideal if you could bypass any crossovers or other processing in the Citation and insert the signal right before the attenuator. If anybody here can make that happen, it's Mac.
SC
|
|
| Back to top |
|
|
macgyver655
Joined: 22 Aug 2007
Posts: 8508
|
| Posted: Thu Sep 02, 2010 3:07 pm Post subject: |
|
|
So lets talk about the BluRay player for now. What are the audio output options on this player?
We can get into the crossover and stuff later.
I'm gone for the day so I'll respond tonight.
|
|
| Back to top |
|
|
virusc
Joined: 11 Apr 2007
Posts: 358
Location: Massachusetts
|
| Posted: Thu Sep 02, 2010 5:39 pm Post subject: |
|
|
thanks,
Just to clarify. The unit is the HK ADP303 to modify and is between a Citation 5.0 preamp and amps like a theta 6 shooter. Yes it has a volume control but only for the processed digital inputs.
What I need help with is where to tap/mod/cut to solder RCA connectors to provide a multi input.
I have a few BLU RAY players but not with 6 channel out yet. I will purchase when I know this is going to work otherwise I will have to upgrade the preamp which I am trying t, avoid for now. thinking about a OPPO,Onkyo, or pioneer.
I know MSB did offer mods for the Citation 7.0 Preamp (I have one of those 2) that added 6 channel but I rather not hack them up if I don't have to.
|
|
| Back to top |
|
|
macgyver655
Joined: 22 Aug 2007
Posts: 8508
|
| Posted: Thu Sep 02, 2010 10:54 pm Post subject: |
|
|
I'm just not seeing why your not using a digital out from a BluRay to a digital in on the ADP303.
But to give you what you want then we need to go back to my post where I asked, find board PD04 and connector PD05 and is there a harness that connects there?
|
|
| Back to top |
|
|
virusc
Joined: 11 Apr 2007
Posts: 358
Location: Massachusetts
|
| Posted: Fri Sep 03, 2010 10:25 am Post subject: |
|
|
OK I will take the cover off and look tonight.
To answer you question, because none of the BLU RAY players will downmix to regular DTS or DD from any of the high rez formats and most of the disks do not have 5.1 DD regular tracks. Usually they downmix to high bi rate DTS which my decoder will not decode correctly so I would have to settle for 2 channel PCM.
|
|
| Back to top |
|
|
|
|
