Sherbourn PT-7030 AV Preamp - The OFFICIAL Thread

[Deleted]

so is the video connected via hdmi straight pass through or is it scaled/molested by the processor ?

[cwt]

Straight pass through for hdmi fattykid ;torino is just for analog video

[maxmercy]

Does the PT-7030 support/decode FLAC 7.1?

If not, will there be a firmware upgrade?

JSS

[cwt]

What is the source JSS it sounds obscure ; a mkv with 7.1 flac ? All my multichannel flac files are 5.1 converted dvd-a . No flac decoder in the 7030 unfortunately in any case Doubtful about any firmware upgrades as the pt7030 is on runout and is inline to be revamped as an emotiva pro model .

A good media player may do the trick

[jonas]

Found out today when I looked at Star Trak - Into Darkness that at one point in the movie there is snapping sound from my speakers. The sound appears 1h 16min into movie, just when hiting full thruttle for warp speed. Clearly a noise that does not belong there.

Have tried to play the movie through both the blu-ray player and my HTPC with the same results.
This happens when running the Dolby True HD audio track on the Star Trek – Into Darkness blu-ray, when shifting to the Dolby Digital audio track, the “snap” sound is gone.

Played the same scene at my friends home theater, and there was no problem with the Dolby True HD audio track at his home theater.

Could there be a problem with the Dolby True HD encoder in my preamp? Is maybe a software update necessary?

The preamp is a Sherbourn PT-7030 which I bought recently, and it´s combined with the PA 7-350 amplifier.

Best regards
Jonas

[Andrew Robinson]

Oct 8, 2013 12:52:22 GMT -5 jonas said:

Found out today when I looked at Star Trak - Into Darkness that at one point in the movie there is snapping sound from my speakers. The sound appears 1h 16min into movie, just when hiting full thruttle for warp speed. Clearly a noise that does not belong there.

Have tried to play the movie through both the blu-ray player and my HTPC with the same results.
This happens when running the Dolby True HD audio track on the Star Trek – Into Darkness blu-ray, when shifting to the Dolby Digital audio track, the “snap” sound is gone.

Played the same scene at my friends home theater, and there was no problem with the Dolby True HD audio track at his home theater.

Could there be a problem with the Dolby True HD encoder in my preamp? Is maybe a software update necessary?

The preamp is a Sherbourn PT-7030 which I bought recently, and it´s combined with the PA 7-350 amplifier.

Best regards
Jonas

Which loudspeakers are you using and what SPL level (in-room volume) are you playing back the film at? 

[jonas]

R,L = B&W DM683, C = B&W HTM61, RS, LS = B&W DS6. The level of the sound follow the spl level, I can hear this at all levels.

And please excuse me if my English fails sometimes. My technical english is not the best.

EDIT: I´ve recorded a 8 second video with my iphone and managed  to capture the sound on movie. Don´t know if that will be helpful, or even legal to upload a small small part of the soundtrack on youtube.

However the sound  also appears when switching to 2 channels. So the sound must be created in the pre-amp somehow?

[GreenKiwi]

Is the second HDMI output selectable? Or is it fixed to the same as the first output?

Thanks,
-gk

[jonas]

Oct 8, 2013 14:18:26 GMT -5 GreenKiwi said:

Is the second HDMI output selectable? Or is it fixed to the same as the first output?

Thanks,
-gk

From the manual:

HDMI Outputs (2)

Both HDMI outputs provide the same signal in parallel at the same time. Both outputs are HDMI 1.4;
HDMI Output 1 is ARC and CEC enabled. HDMI video signals are passed through without scaling.
3D video is only available through the HDMI outputs.

[GreenKiwi]

Thanks... guess I should have *RTFM* =D

[cwt]

Oct 8, 2013 13:37:33 GMT -5 jonas said:

However the sound  also appears when switching to 2 channels. So the sound must be created in the pre-amp somehow?

Just tried my copy at that time point jonas the 7.1 dolbytruehd is fine as was the 5.1dd voice over descriptive track . Modded oppo 83 feeding the pt7030 ; If you're sending bitstream does it do it with decoded lpcm as well ? That will rule out the pt7030 decoder sending the pcm straight to the dacs

[jonas]

Oct 9, 2013 8:07:20 GMT -5 cwt said:

Oct 8, 2013 13:37:33 GMT -5 jonas said:

However the sound  also appears when switching to 2 channels. So the sound must be created in the pre-amp somehow?

Just tried my copy at that time point jonas the 7.1 dolbytruehd is fine as was the 5.1dd voice over descriptive track . Modded oppo 83 feeding the pt7030 ; If you're sending bitstream does it do it with decoded lpcm as well ? That will rule out the pt7030 decoder sending the pcm straight to the dacs

Thank you for taking time. When the Dolby True HD audio track is decoded in the blu-ray player the sound never appears. So seems like something is wrong with my True HD decoder?

[Deleted]

It's actually the processor that does the decoding of the HD signal, unless your BD player decodes it and you are sending the signal to the processor via analog outputs

[cwt]

Oct 9, 2013 9:23:09 GMT -5 jonas said:

Thank you for taking time. When the Dolby True HD audio track is decoded in the blu-ray player the sound never appears. So seems like something is wrong with my True HD decoder?

To clarify ; its the snap sound you mean not no sound at all ? Could well be in the decoder jonas ; since you can reproduce it when switching codecs ; try a different hdmi cable to see if its the edid handshake [ some arent certified to say hi speed and constructed well ] and also try a different hdmi port ;hdmi connectivity isn't the best

edit: neekos I asked jonas to decode the truehd in his bd player and send lpcm instead to ascertain where the problem was . You don't need multichannel analogs to do this . Try it the pt7030 vfd will read multichannel instead of dolby truehd ; the other option is multichannel + downmix

Very old bd players didn't have lossless decoders in them but it's de rigeur these days

[jonas]

Sensei,

There is no snapping sound, the audiotrack sounds normal. The problem appears when playing both through my blu-ray player and my HTPC, two different sources on two different HDMI inputs. I use high quality HDMI cables. And there are no long distances, 1m cables.

Maybe the problem is bigger then I´m actually aware of, since my purchase of the PT-7030, Star Trek - Into Darkness may very well be the only Dolby True HD audio track I´ve heard so far. Been looking much at netflix lately and there is no hd-audio.

this was not so funny, espeacilly when I live in Sweden and return cost to US is about 250$

[repeetavx]

A tech question.

I know that volume is controlled in the analog circuitry. My question is when using an analog input is bass management handled in the analog circuitry?

[Deleted]

A few guys were talking about almost the same issue on the umc 200 a couple weeks ago. loud pops when the enterprise warship crashes down near the end of the movie

[jonas]

well I´ve contacted support, hope they can help me. I´ll let you know when they answer.

[KeithL]

Bass management is a processor function.

Oct 9, 2013 12:12:19 GMT -5 repeetavx said:

A tech question.

I know that volume is controlled in the analog circuitry. My question is when using an analog input is bass management handled in the analog circuitry?

[KeithL]

The decoder (any decoder these days) is basically a program running in a computer. It is very unlikely that it is "flawed" or "defective" in the sense of requiring repair. From the description, it sounds like the pop is occurring at a point where there is some strong low frequency content. This leads me to suspect that it is nothing more than a momentary clip of the audio signal.

It could be a momentary clip occurring in the pre/pro itself because of some fluke combination of EQ and gain settings. It could also be happening in some downstream component for the same reason - because of a short but especially intense signal at some particular frequency (of course the output will be different with TruHD than with DD; that is the whole point of using TruHD, right?)

Unless you notice this happening with other titles, I really wouldn't worry about it.

Oct 9, 2013 11:45:55 GMT -5 jonas said:

Sensei,

There is no snapping sound, the audiotrack sounds normal. The problem appears when playing both through my blu-ray player and my HTPC, two different sources on two different HDMI inputs. I use high quality HDMI cables. And there are no long distances, 1m cables.

Maybe the problem is bigger then I´m actually aware of, since my purchase of the PT-7030, Star Trek - Into Darkness may very well be the only Dolby True HD audio track I´ve heard so far. Been looking much at netflix lately and there is no hd-audio.

this was not so funny, espeacilly when I live in Sweden and return cost to US is about 250$