RE: Amplifying rear speakers separatly

["Stuart Booth" <stuart@xxxxxxx>]

On 26 Mar 02, at 16:00, steve.cooper@xxxxxxx wrote:

> And just to clarify all this allows you to just turn the volume up and
> down. ;-)

<Howls of laughter from the floor!!!>

My sides hurt...

Stuart[B]



>                     "Mark Harrison"
>                     <Mark.Harrison@ekingf        To:    
<ukha_d@xxxxxxx>
>                     isher.com>                   cc:
>                                                  Subject:     RE:
[ukha_d] Amplifying rear speakers separatly
>                     26/03/02 15:51
>                     Please respond to
>                     ukha_d
>
>
>
>
>
> Git!
>
> OK, here goes, how I do DVD playback:
>
> ALL SIGNALS FROM HERE GO AS DIGITAL STREAMS, EITHER PCM OR DOLBY
DIGITAL
> DEPENDING ON THE SOURCE MATERIAL
>
> - The source is a Pioneer DVD player (second black box from the bottom
> on the right-hand stack)
>
> The audio goes, via SP/DIF (the single reddy-pink cable), down onto
the
> floor, then into the source switch
>
> - The source switch is a Meridian 562V, (middle black box, narrower
> width, on the left-hand stack)
> --- It's worth noting that the other sources, such as the DDAR (top
> black box, narrowest width, on the left-hand stack) that go into the
> 562V as analogue get CONVERTED into DIGITAL at this point... All the
DSP
> stuff happens entirely in the digital domain.
>
> Assuming that the selected source is "DVD", this goes, via
(a virtually
> impossible to see) SP/DIF cable into the processor
>
> - The processor is a Meridian 561 (lower black box, narrower width, on
> the left-hand stack)
>
> WHILE THE PROCESSOR IS CAPABLE OF OUTPUTTING UP TO 8 CHANNELS OF
AUDIO,
> IN EITHER ANALOGUE OR DIGITAL FORMAT, AT PRESENT I ONLY USE 4
CHANNELS,
> AND OUTPUT THEM ALL AS ANALOGUE AT LINE LEVEL
>
> Front pair
>
> The main stereo pair come out on a (virtually impossible to see) pair
of
> phono connectors into the integrated amp
>
> - The integrated amp is a John Shearne Phase 2 (wider width, but
thinner
> depth top black box on the right-hand stack.)
> --- the black speaker cables go out of this and drive the treble
drivers
> on the front speaker pair
>
> The integrated amp also has a line-level passthrough on the
> (purpley-pink) analogue pair to the power amp
>
> - The power amp is a John Shearne Phase 2 (wider width, but thinner
> depth second-to-top black box on the right-hand stack.)
> --- The pinky speaker cables go out of this and drive the bass drivers
> on the front speaker pair
>
> Rear pair
>
> The rear stereo pair come out on a (virtually impossible to see, but
you
> can see the red and white boots on the processor) anlogue pair, into a
> KAT5 TX
>
> - The KAT5 TX is almost out of shot, on the floor, but you can just
see
> a corner of it at the far right on the bottom edge of the picture, to
> the right of the mains block
>
> ... this goes into a CAT5 socket in the wall, back to the patch panel,
> where it's patched to a CAT5 socket at the other end of the room. This
> goes into a KAT5 RX, which drives an old Integrated amplifier (Pioneer
> A-400), which drives a the rear pair of speakers.
>
> Volume controls
>
> The logic in this is that the "changing the volume"
circuitry (pre-amp)
> is kept separate from the "amplifying lots" circuitry (power
amp) to
> avoid interference.
>
> A power amp has FIXED GAIN, rather than a variable gain, so you need
> something else to control the volume, otherwise it would always be at
> max.
>
> The pre-amp, which is the only volume control that ever gets touched,
is
> on the processor. The processor, as we've seen purely operates on a
> DIGITAL input, and turns it into line-level, ANALOGUE outputs.
>
> In practice, both the front and rear amplifiers actually have volume
> controls, but these are just left "whacked up to about 75%",
and the
> volume adjustment is done on the processor.
>
> Mark Harrison
> Head of Systems, eKingfisher
>
> -----Original Message-----
> From: James Hoye [mailto:james.hoye@xxxxxxx]
> Sent: 26 March 2002 15:07
> To: ukha_d@xxxxxxx
> Subject: RE: [ukha_d] Amplifying rear speakers separatly
>
>
>
> Ahh I see a man about to be initiated into the "real" audio
club :-)
>
> Go mark go mark go mark :-)
>
> And feel free to refer to
> http://groups.yahoo.com/group/ukha_d/files/mharrison_avkit.jpg
> <http://groups.yahoo.com/group/ukha_d/files/mharrison_avkit.jpg>
 as you
> explain!!!
>
> James H
>