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RE: Dolby Surround and KAT5


  • To: <ukha_d@xxxxxxx>
  • Subject: RE: Dolby Surround and KAT5
  • From: "Phil Harris" <phillip.harris1@xxxxxxx>
  • Date: Fri, 29 Jun 2001 16:25:12 +0100
  • Delivered-to: rich@xxxxxxx
  • Delivered-to: mailing list ukha_d@xxxxxxx
  • Mailing-list: list ukha_d@xxxxxxx; contact ukha_d-owner@xxxxxxx
  • Reply-to: ukha_d@xxxxxxx

Title: RE: [ukha_d] Dolby Surround and KAT5
I did a test run of the KAT5's using a short patch lead and my AV amp t make sure all was OK before installing and it certainly seemed t be fine with ProLogic ... not sure what could be causing your problem.
 
Phil
-----Original Message-----
From: Kevin Hawkins [mailto:tivo@xxxxxxx]
Sent: 29 June 2001 12:58
To: ukha_d@xxxxxxxSubject: RE: [ukha_d] Dolby Surround and KAT5

        I'll have a go at these suggestions - particularly lugging the old Sony Dolby amp down t the source again and using a patch cord. Should eliminate a lot of possibilities.

        I am fairly sure there is not a 180 degree phase shift as I checked this straight away - the stereo image is fine as well. (there is a patch panel involved and I could have had a lapse at the wiring stage (or a beer or five). they are a tedious job t wire).

        I am however a bit skeptical on the source (Tivo) as the Nicam decoding is an ongoing problem t them, the material I have used is existing stuff though plus a new recording.

        On a tech point - if say the low frequencies were phase shifted by an amount different t the high frequencies - but by the same on both L/R channels would this screw up the matrix decoding for the Dolby surround ?? It may well be that the Tivo introduces this (even when you watch your TV live with a Tivo  it is encoded, recorded and replayed, hence the 3 sec delay).

        I assume from Phils' response he is using Dolby Pro Logic surround (analogue) with no problems and from his experience in this area he would I'm sure have noticed any problems , particularly as bad as this.

        Kevin


There shouldnt be any phase shift problems at all.
 
Have you tried with the two units in the same room just using a patch cord ?
 
The only reason I can think of is that you have one of your cable pairs reversed which would put that channel 180 degrees out of phase.
 
Both audio circuits are identical.
 
Pairs t check are BLUE/White and GREEN/White
 
Reversals on Video pairs will result in no picture.
 
Are there any differences in Audio level between Left/Right?
What happens if you feed a mono source into both inputs?
 
Keith
-----Original Message-----
From: Kevin Hawkins [mailto:tivo@xxxxxxx]
Sent: 29 June 2001 11:53
To: ukha_d@xxxxxxxSubject: [ukha_d] Dolby Surround and KAT5

        Is anyone else using Dolby Surround and KAT5 t gether ?
        I am experiencing very different surround effects over the KAT5 t the (non extended) sound... Particularly the general 'drone' that one tends t always get from the rear channels is hugely increased t the point of major distraction. Length is 30m.
        The frequency response and 'clarity' of an ordinary stereo source seem fine.
        Is there any possibility that phase shifts in the two audio channels are causing this ? Particularly if they were frequency dependant phase shifts ?

        Kevin

PS Should post this in the KAT5 discussion group I guess but my user/password is setup on another machine that I haven't unpacked yet - sorry.
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